JP2016527893A - Smoking article comprising a flammable heat source having at least one air flow channel - Google Patents

Abstract

Smoking article (2, 34, 38, 42, 44, 48): Combustible heat source (4) with opposed front (6) and rear surface (8); front surface (6) of combustible heat source (4) One or more airflow channels (18) extending from the rear surface (8) to the rear surface (8); the aerosol-forming substrate (10) downstream of the rear surface (8) of the combustible heat source (4); downstream of the aerosol-forming substrate (10) A mouthpiece (14); and one or more air inlets (32, 36) located downstream of the rear face (8) of the combustible heat source (4) and upstream of the mouthpiece (14). One or more air inlets (32, 36) are located between the rear face (8) of the combustible heat source (4) and the downstream end of the aerosol-forming substrate (10). In use, air drawn through the aerosol-forming substrate (10) passes through one or more airflow channels (18) and one or more air inlets (32, 36) to form a smoking article (2, 34, 38, 42, 44, 48) and at least a portion of the air drawn through the aerosol-forming substrate (10) is in direct contact with the combustible part of the combustible heat source (4). [Selection] Figure 1

Description

  The present invention relates to a smoking article comprising a combustible heat source having opposed front and rear surfaces and at least one air flow channel and an aerosol-forming substrate downstream of the rear surface of the combustible heat source.

  Many smoking articles that have been heated rather than burned 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 the burning and pyrolytic degradation of tobacco in conventional cigarettes. In one known type of heated smoking article, the aerosol is generated by heat transfer from a combustible heat source to an aerosol-forming substrate. The aerosol forming substrate may be located around or downstream of the combustible heat source. 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 compound cools, it condenses to form an aerosol that is inhaled by the user. Typically, air is drawn into such known heated smoking articles via one or more airflow channels provided via a combustible heat source, and the aerosol from the combustible heat source. Heat transfer to the forming substrate occurs by forced convection and conduction.

  For example, WO-A2-2009 / 022232 is around and in direct contact with a combustible heat source, an aerosol-forming substrate downstream of the combustible heat source and a rear portion of the combustible heat source and a front portion of the adjacent aerosol-forming substrate. A smoking article including a thermally conductive element is disclosed. In order to provide a controlled amount of forced convection heating of the aerosol-forming substrate, at least one longitudinal airflow channel is provided through the combustible heat source.

  In known heated smoking articles, where heat transfer from the combustible heat source to the aerosol-forming substrate occurs primarily by forced convection, the forced convection heat transfer and hence the temperature at the aerosol-forming substrate depends on the user's smoke-taking behavior. Can vary considerably. As a result, the mainstream aerosol composition and hence sensory properties produced by such known heated smoking articles can be unfortunately highly influenced by the user's smoking situation.

  In addition, in known heated smoking articles that include one or more airflow channels along a combustible heat source, air that is drawn through the one or more airflow channels while the user smokes Direct contact with the combustible heat source results in activation of combustion of the combustible heat source. Thus, a smoking situation can lead to forced convection heat transfer high enough to cause a spike in the temperature of the aerosol-forming substrate, undesirably pyrolysis of the aerosol-forming substrate and potentially even more localized. Lead to burning. The term “spike” as used herein is used to describe a short-term increase in the temperature of the aerosol-forming substrate. As a result, the level of undesirable pyrolysis and combustion by-products in the mainstream aerosol produced by such known heated smoking articles is also unfavorable for the specific smoking situation employed by the user. Can vary significantly depending on.

  US 4,714,082 discloses a smoking article comprising a combustible fuel element, an aerosol generating means and a mouth end filter. In the embodiments shown in FIGS. 1, 3, 4, 6, 7, 8 and 9, the combustible fuel element 10 includes one or more longitudinally extending holes 16. In these embodiments, there is no air inlet located between the rear face of the combustible fuel element 10 and the downstream end of the aerosol generating means 12. In the embodiment shown in FIG. 2, the aerosol generating means 12 includes a thermally stable carbonaceous substrate 28 and the combustible fuel element 24 is provided by a heat conducting rod 26 and by a paper tube 14 lined with foil. Connected to the aerosol generating means 12. This embodiment includes a void space 30 between the combustible fuel element 10 and the substrate 28, and the portion of the tube 14 lined with foil surrounding the void space 30 allows sufficient air to enter the void space. And includes a plurality of peripheral holes 32 that provide a suitable pressure drop. In this embodiment, the combustible fuel element 24 does not include any longitudinally extending holes 16.

  It is known to include additives in the flammable heat source of heated smoking articles to improve the ignition and flammability of the flammable heat source. However, the inclusion of ignition and combustion additives can give rise to decomposition and reaction products, which are provided along the flammable heat source of such known heated smoking articles during their use or It can be detrimental to the air sucked through multiple airflow channels.

  To facilitate aerosol formation, the aerosol-forming substrate of the heated smoking article typically includes a polyhydric alcohol such as glycerin or other known aerosol-forming agent. During storage and smoking, such aerosol forming agents can be transferred from the aerosol forming substrate of known heated smoking articles to their combustible heat source. Transfer of the aerosol-forming agent to the flammable heat source of known heated smoking articles can lead to the degradation of the aerosol-forming agent, particularly during smoking of the heated smoking article.

  For heated smoking articles comprising an aerosol-forming substrate downstream of the flammable heat source rear surface where spikes in the temperature of the flammable heat source and aerosol-forming substrate with opposite front and rear surfaces are avoided in situations of intense smoking Demand remains. In particular, heating involving a combustible heat source with opposed front and rear surfaces and an aerosol-forming substrate downstream of the rear surface of the combustible heat source where the combustion or pyrolysis of the aerosol-forming substrate does not occur substantially under smoking conditions There remains a demand for smoking articles.

  In accordance with the present invention, a combustible heat source having opposed front and rear surfaces; one or more airflow channels extending from the front surface to the rear surface of the combustible heat source; an aerosol-forming substrate downstream of the rear surface of the combustible heat source; A smoking article is provided that includes a mouthpiece downstream of the forming substrate; and one or more air inlets located downstream of the rear face of the combustible heat source and upstream of the mouthpiece. One or more air inlets are located between the rear face of the combustible heat source and the downstream end of the aerosol-forming substrate. In use, air drawn through the aerosol-forming substrate enters the smoking article through one or more airflow channels and one or more air inlets, and air that is drawn through the aerosol-forming substrate. At least a portion is in direct contact with the combustible portion of the combustible heat source.

  As used herein, the term “aerosol-forming substrate” is used to describe a substrate that is capable of releasing volatile compounds capable of forming an aerosol upon heating. The aerosol produced from the aerosol-forming substrate of the smoking article according to the present invention may or may not be visible, and vapors (eg, fine powders of gaseous substances are usually liquid or solid at room temperature). As well as liquid droplets of gases and condensed vapors.

  The aerosol-forming substrate may be in the form of a plug or segment that includes a material surrounded by a wrapper that can release volatile compounds capable of forming an aerosol upon heating. If the aerosol-forming substrate is in the form of such a plug or segment, the entire plug or segment including the wrapper is considered to be an aerosol-forming substrate.

  As used herein, the terms “distal”, “upstream” and “front” and “proximal”, “downstream” and “backward” refer to the direction in which a user sucks a smoking article during its use. Used to describe the relative position of a component or component part of a smoking article. A smoking article according to the present invention includes, in use, a proximal end where the aerosol exits the smoking article for delivery to the user. The proximal end of the smoking article may also be referred to as the mouth end. In use, the user inhales at the proximal end of the smoking article to inhale the aerosol generated by the smoking article.

  The combustible heat source is located at or near the distal end. The mouthpiece is located at the proximal end. The mouth end is downstream of the distal end. The proximal end may also be referred to as the downstream end of the smoking article and the distal end may also be referred to as the upstream end of the smoking article. The components or component parts of a smoking article according to the present invention may be described as being upstream or downstream of each other based on their relative positions between the proximal and distal ends of the smoking article. Good.

  The front face of the combustible heat source is at the upstream end of the combustible heat source. The upstream end of the combustible heat source is the end of the combustible heat source furthest from the proximal end of the smoking article. The rear face of the combustible heat source is at the downstream end of the combustible heat source. The downstream end of the combustible heat source is the end of the combustible heat source closest to the proximal end of the smoking article.

  As used herein, the term “length” is used to describe the maximum dimension in the machine direction of a smoking article. It is the largest dimension in the direction between the proximal end of the smoking article and the opposite distal end.

  As used herein, the term “airflow channel” is used to describe a channel that extends along the length of a combustible heat source through which air can be drawn downstream for inhalation by a user.

  As used herein, the term “direct contact” enters the smoking article through the surface of the combustible portion of the combustible heat source and one or more airflow channels and one or more air inlets, and Used to describe contact with at least a portion of air inhaled through an aerosol-forming substrate.

  A smoking article according to the present invention includes a non-blind flammable heat source. As used herein, the term “non-blind” is used to describe a combustible heat source that includes at least one airflow channel.

  The one or more airflow channels may include one or more sealed airflow channels.

  The term “sealed” as used herein is used to describe an air flow path that extends through and is surrounded by the interior of a combustible heat source.

  Alternatively or in addition, the one or more airflow channels may include one or more unsealed airflow channels. For example, the one or more airflow paths may include one or more grooves or other unsealed airflow channels that extend along the exterior of the combustible heat source.

  The one or more airflow channels may include one or more sealed airflow channels or one or more unsealed airflow channels or combinations thereof.

  In certain embodiments, a smoking article according to the present invention includes one, two or three airflow channels extending from the front surface to the rear surface of the combustible heat source.

  In a preferred embodiment, a smoking article according to the present invention includes a single airflow channel extending from the front surface to the rear surface of the combustible heat source.

  In a particularly preferred embodiment, the smoking article according to the present invention includes a single substantially central or axial airflow channel extending from the front surface to the rear surface of the combustible heat source.

  In such embodiments, the diameter of the single airflow channel is preferably between about 1.5 mm and about 3 mm.

  In addition to one or more airflow channels through which air can be inhaled for inhalation by the user, the flammable heat source of the smoking article according to the present invention also provides for air to be inhaled by the user. It will be appreciated that it may include one or more closed or blocked passages through which it cannot be inhaled.

  For example, a smoking article according to the present invention is combustible only halfway along the length of the combustible heat source and the combustible heat source including one or more airflow channels extending from the front surface to the rear surface of the combustible heat source. It may include one or more closed passages extending from the front of the heat source.

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

  A smoking article according to the present invention includes one or more air inlets located downstream of the rear face of the combustible heat source and upstream of the mouthpiece.

  As used herein, the term “air inlet” is used to describe a hole, cut, slot or other opening through which air can be drawn into a smoking article.

  One or more air inlets are located between the rear face of the combustible heat source and the downstream end of the aerosol-forming substrate. The one or more air inlets do not include any air inlet located between the downstream end of the aerosol-forming substrate and the upstream end of the mouthpiece. In other words, the smoking article according to the present invention does not include any air inlets located downstream of the aerosol-forming substrate and upstream of the mouthpiece.

  The number, shape, size and position of the air inlets may be appropriately adjusted to achieve excellent smoking performance.

  In use, air drawn through the aerosol-forming substrate of the smoking article enters the smoking article through one or more airflow channels and one or more air inlets. Inhaled air passes downstream through the smoking article to the mouthpiece and exits the smoking article through its proximal end.

  In use, at least a portion of the air drawn through the aerosol-forming substrate is in direct contact with the combustible portion of the combustible heat source.

  Air that is inhaled through the aerosol-forming substrate of the smoking article that enters the smoking article through one or more airflow channels is a combustible heat source as it passes through the one or more airflow channels. Direct contact with the flammable part of

  Alternatively, or in addition, air drawn through the aerosol-forming substrate of the smoking article that enters the smoking article through one or more airflow channels can be in direct contact with the rear surface of the combustible heat source. In such embodiments, the air drawn through the aerosol-forming substrate of the smoking article that enters the smoking article through one or more air inlets may also be in direct contact with the rear face of the combustible heat source.

  In smoking articles according to the present invention, heating of the aerosol-forming substrate occurs by conduction and forced convection.

  While the user smokes, the cold air drawn through one or more air inlets between the rear face of the flammable heat source and the aerosol-forming substrate is a component of the aerosol-forming substrate of the smoking article according to the present invention. Reduce the temperature conveniently. This advantageously substantially prevents or prevents spikes in the temperature of the aerosol-forming substrate of the smoking article according to the present invention while the user smokes.

  As used herein, the term “cold air” is used to describe ambient air that is not significantly heated by a combustible heat source as the user smokes.

  The inclusion of one or more air inlets between the rear face of the flammable heat source and the downstream end of the aerosol-forming substrate, by preventing or preventing spikes in the temperature of the aerosol-forming substrate, can cause severe smoking The following serves to conveniently avoid or reduce combustion or thermal decomposition of the aerosol-forming substrate of the smoking article according to the present invention. In addition, the inclusion of one or more air inlets between the rear face of the combustible heat source and the downstream end of the aerosol-forming substrate may be used by the user in the mainstream aerosol composition of smoking articles according to the present invention. Conveniently minimizes or reduces the effects of the smoking situation.

  The one or more air inlets may include one or more first air inlets around the periphery of the aerosol forming substrate through which air can be drawn into the aerosol forming substrate. In such embodiments, in use, cold air is drawn into the aerosol-forming substrate of the smoking article through the first air inlet. Air drawn into the aerosol-forming substrate through the first air inlet passes downstream from the aerosol-forming substrate to the mouthpiece through the smoking article and exits the smoking article through its proximal end.

  While the user is smoking, the cold air drawn through one or more first inlets around the periphery of the aerosol-forming substrate favors the temperature of the aerosol-forming substrate of the smoking article according to the present invention. Reduce. This advantageously substantially prevents or prevents spikes in the temperature of the aerosol-forming substrate of the smoking article according to the present invention while the user smokes.

  In certain preferred embodiments, the one or more first air inlets are located close to the downstream end of the aerosol-forming substrate.

  In certain embodiments, the aerosol-forming substrate may be in contact with a nonflammable, substantially air impermeable first barrier coating provided on the rear surface of the combustible heat source or on the rear surface of the combustible heat source.

  As used herein, the term “contacting” refers to an aerosol that is in direct contact with a nonflammable, substantially air impervious first barrier coating provided on the rear surface of the combustible heat source or on the rear surface of the combustible heat source. Used to describe the forming substrate.

  In other embodiments, the aerosol-forming substrate may be remote from the rear surface of the combustible heat source. That is, there may be a space or gap between the aerosol-forming substrate and the rear face of the combustible heat source.

  In such embodiments, the one or more air inlets may include one or more second air inlets between the rear surface of the combustible heat source and the aerosol-forming substrate. In use, cold air is drawn into the space between the combustible heat source and the aerosol-forming substrate through the second air inlet. Air drawn into the space between the flammable heat source and the aerosol-forming substrate through the second air inlet is downstream through the smoking article from the space between the flammable heat source and the aerosol-forming substrate to the mouthpiece. And exit the smoking article through its proximal end.

  While the user smokes, the cold air drawn through one or more second air inlets between the rear face of the combustible heat source and the aerosol-forming substrate is the aerosol of the smoking article according to the present invention. Conveniently lower the temperature of the forming substrate. This advantageously substantially prevents or prevents spikes in the temperature of the aerosol-forming substrate of the smoking article according to the present invention while the user smokes.

  The smoking article according to the invention has one or more first air inlets around the periphery of the aerosol-forming substrate or one or more second between the rear surface of the flammable heat source and the aerosol-forming substrate. One or more first air inlets around the periphery of the air inlet or aerosol forming substrate and one or more second air inlets between the rear surface of the flammable heat source and the aerosol forming substrate. It will be appreciated that combinations may be included.

  A smoking article according to the invention comprises (i) a non-flammable, substantially air-impermeable first barrier between the rear face of the combustible heat source and the aerosol-forming substrate, or (ii) one with a combustible heat source or It may further include any one of nonflammable and substantially air impermeable second barriers between the plurality of airflow channels.

  A smoking article according to the invention comprises (i) a non-flammable, substantially air-impermeable first barrier between the rear face of the combustible heat source and the aerosol-forming substrate and / or (ii) a combustible heat source. It will be appreciated that both non-flammable and substantially air impermeable second barriers between the plurality of airflow channels may not be included.

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

  If the smoking article according to the present invention further comprises (i) a non-flammable and substantially air impermeable first barrier between the rear face of the combustible heat source and the aerosol-forming substrate, one or more air streams Air that is drawn through the aerosol-forming substrate that enters the smoking article through the flow path or one or more air inlets does not come into direct contact with the rear face of the combustible heat source. However, in such embodiments, air that is inhaled through the aerosol-forming substrate that enters the smoking article through one or more airflow channels passes through the one or more airflow channels. Sometimes in direct contact with the combustible part of the combustible heat source.

  In such embodiments, the first barrier allows air entering the smoking article through one or more airflow channels to be drawn downstream through the smoking article.

  The first barrier may contact one or both of the rear face of the combustible heat source and the aerosol-forming substrate. Alternatively, the first barrier may be remote from one or both of the aerosol forming substrate and the mouthpiece.

  The first barrier may be adhered to or separately attached to one or both of the rear surface of the combustible heat source and the aerosol-forming substrate.

  In certain preferred embodiments, the first barrier includes a non-flammable, substantially air-impermeable first barrier coating provided on the rear surface of the combustible heat source. In such embodiments, preferably, the first barrier includes a first barrier coating provided over at least substantially the entire rear surface of the combustible heat source. More preferably, the first barrier includes a first barrier coating provided over the entire rear surface of the combustible heat source.

  In such embodiments, the first barrier coating allows air to be drawn downstream through one or more airflow channels that extend from the front surface to the rear surface of the combustible heat source.

  The term “coating”, as used herein, is used to describe a layer of material that covers and adheres to a combustible heat source.

  The first barrier may conveniently limit the temperature to which the aerosol-forming substrate is exposed during ignition and combustion of the combustible heat source, and as such, the heat of the aerosol-forming substrate during use of the smoking article. It can help to avoid or reduce decomposition or combustion. This is particularly beneficial when the combustible heat source includes one or more additives to assist ignition of the combustible heat source.

  Also, the inclusion of a non-flammable and substantially air impermeable first barrier between the rear face of the combustible heat source and the aerosol-forming substrate is in accordance with the present invention to the combustible heat source during storage of smoking articles. Conveniently, the movement of the components of the aerosol-forming substrate of the smoking article can be substantially prevented or prevented.

  Alternatively or in addition, the inclusion of a non-flammable, substantially air-impermeable first barrier between the rear face of the flammable heat source and the aerosol-forming substrate may be included in the flammable heat source during use of the smoking article. Advantageously, movement of components of the aerosol-forming substrate of the smoking article according to the present invention may be substantially prevented or prevented.

  The inclusion of a non-flammable, substantially air-impermeable first barrier between the rear face of the combustible heat source and the aerosol-forming substrate is particularly beneficial when the aerosol-forming substrate includes at least one aerosol-forming agent. obtain.

  In such embodiments, the inclusion of a non-flammable, substantially air-impermeable first barrier between the rear surface of the combustible heat source and the aerosol-forming substrate provides for aerosol formation during storage and use of the smoking article. The transfer of at least one aerosol former from the substrate to the combustible heat source may be conveniently prevented or prevented. Thus, degradation of the at least one aerosol former during use of the smoking article can be advantageously substantially avoided or reduced.

  Depending on the desired characteristics and performance of the smoking article, the first barrier may have a low or high thermal conductivity. In certain embodiments, the first barrier is about 0.1 watts per meter Kelvin (W) at 23 ° C. and 50% relative humidity as measured using a modified unsteady planar heat source (MTPS) method. / (m · K)) to about 200 watts per meter per Kelvin (W / (m · K)) may be formed from a material having a bulk thermal conductivity.

  The thickness of the first barrier may be appropriately adjusted to achieve excellent smoking performance. In certain embodiments, the first barrier may have a thickness between about 10 microns and about 500 microns.

  The first barrier may be formed from one or more suitable materials that are substantially thermally stable and incombustible at temperatures achieved by the combustible heat source during ignition and combustion. Suitable materials are known in the art and include, but are not limited to, clays (such as bentonite and kaolinite), glass, minerals, ceramic materials, resins, metals and combinations thereof.

Preferred materials from which the first barrier can be formed include clay and glass. More preferred materials from which the first barrier can be formed include copper, aluminum, stainless steel, alloys, alumina (Al ₂ O ₃ ), resins and mineral adhesives.

  In certain preferred embodiments, the first barrier comprises a clay coating comprising a 50/50 mixture of bentonite and kaolinite provided on the rear face of the combustible heat source. In other preferred embodiments, the first barrier comprises a glass coating provided on the rear face of the combustible heat source, more preferably a sintered glass coating.

  In certain particularly preferred embodiments, the first barrier includes an aluminum coating provided on the rear face of the combustible heat source.

  Preferably, the first barrier has a thickness of at least about 10 microns.

  In embodiments where the first barrier includes a clay coating provided on the rear face of the combustible heat source due to the low permeability of the clay to air, the clay coating is more preferably at least about 50 microns, and most preferably It has a thickness between about 50 microns and about 350 microns.

  In embodiments where the first barrier is formed from one or more materials that are air impermeable, such as aluminum, the first barrier may be thinner, and generally thinner than about 100 microns, and More preferably it will have a thickness of about 20 microns.

  In embodiments where the first barrier includes a glass coating provided on the rear surface of the combustible heat source, the glass coating preferably has a thickness of less than about 200 microns.

  The thickness of the first barrier may be measured using a microscope, scanning electron microscope (SEM), or any other suitable measurement method known in the art.

  If the first barrier includes a first barrier coating provided on the back side of the flammable heat source, the first barrier coating can be spray painted, vapor deposited, dipped, mass transferred (eg, brushed or glueed), electrostatic It may be applied to cover and adhere to the rear face of the flammable heat source by any suitable method known in the art including, but not limited to, accumulation or any combination thereof.

  For example, the first barrier coating pre-forms the barrier to the approximate size and shape of the rear face of the combustible heat source and applies it to the rear face of the combustible heat source so that at least substantially after the combustible heat source. It may be made by covering the whole area and bonding to it. Alternatively, the first barrier coating can be cut or otherwise machined after it is applied to the rear face of the combustible heat source. In one preferred embodiment, an aluminum foil is applied to the rear face of the combustible heat source by gluing or pressing the combustible heat source, and the aluminum foil is at least substantially the entire rear face of the combustible heat source (after the combustible heat source). Is cut or otherwise machined to cover and adhere.

  In another preferred embodiment, the first barrier coating is formed by applying a solution or suspension of one or more suitable coating materials to the rear surface of the combustible heat source. For example, the first barrier coating may be by dipping the back side of the flammable heat source in a solution or suspension of one or more suitable coating materials, or by brushing or spraying the solution or suspension Or may be applied to the rear surface of the combustible heat source by electrostatically depositing a powder or powder mixture of one or more suitable coating materials onto the rear surface of the combustible heat source. Combustible if the first barrier coating is applied to the rear face of the flammable heat source by electrostatically depositing a powder or powder mixture of one or more suitable coating materials on the rear face of the flammable heat source The rear surface of the heat source is preferably pretreated with water glass prior to electrostatic accumulation. Preferably, the first barrier coating is applied by spray painting.

  The first barrier coating may be formed by a single application of a solution or suspension of one or more suitable coating materials to the rear face of the combustible heat source. Alternatively, the first barrier coating may be formed by multiple applications of a solution or suspension of one or more suitable coating materials to the rear face of the combustible heat source. For example, the first barrier coating may be one, two, three, four, five, six, seven or eight times of a solution or suspension of one or more suitable coating materials on the rear face of the combustible heat source. It may be formed by continuous application.

  Preferably, the first barrier coating is formed by applying between 1 and 10 times a solution or suspension of one or more suitable coating materials to the rear face of the combustible heat source.

  After application of the solution or suspension of one or more coating materials to the rear side, the combustible heat source may be dried to form a first barrier coating.

  When the first barrier coating is formed by multiple applications of a solution or suspension of one or more suitable coating materials on its rear surface, the combustible heat source is a continuous application of the solution or suspension May need to be dried during.

  Alternatively, or in addition to drying, after application of a solution or suspension of one or more coating materials to the rear face of the combustible heat source, the coating material on the combustible heat source forms a first barrier coating For this reason, it may be sintered. Sintering of the first barrier coating is particularly preferred when the first barrier coating is a glass or ceramic coating. Preferably, the first barrier coating is sintered at a temperature between about 500 ° C and about 900 ° C, and more preferably at about 700 ° C.

  One or more if the smoking article according to the invention further comprises (ii) a non-flammable and substantially air impermeable second barrier between the flammable heat source and the one or more air flow channels Air that is drawn through an aerosol-forming substrate that enters a smoking article through the airflow channel of the air is in direct contact with the combustible part of the combustible heat source as it passes through one or more airflow channels do not do. However, in such embodiments, the air drawn through the aerosol-forming substrate that enters the smoking article through one or more airflow channels is in direct contact with the rear face of the combustible heat source. In such embodiments, the air drawn through the aerosol-forming substrate that enters the smoking article through one or more air inlets may also be in direct contact with the rear face of the combustible heat source.

  The second barrier is the combustion and decomposition products formed during the ignition and combustion of the combustible heat source of the smoking article according to the present invention, and the inhaled air passes through one or more air flow channels. When passing, it may advantageously be substantially prevented or prevented from entering the air drawn into the smoking article according to the present invention through one or more airflow channels. This is particularly beneficial when the combustible heat source includes one or more additives to assist ignition or combustion of the combustible heat source.

  In addition, the inclusion of a non-flammable, substantially air-impermeable second barrier between the combustible heat source and the one or more airflow passages allows smoking according to the present invention while the user smokes. The activation of combustion of the combustible heat source of the article may be advantageously substantially prevented or prevented. This may substantially prevent or prevent spikes in the temperature of the aerosol-forming substrate while the user smokes.

  Smoking according to the present invention, even in situations where smoking is intense, by preventing or inhibiting the activation of combustion of the combustible heat source and thus preventing or preventing excessive temperature rise in the aerosol-forming substrate. Combustion or pyrolysis of the aerosol-forming substrate of the article can be advantageously avoided. In addition, the impact of the user's tobacco smoking situation in the mainstream aerosol composition of smoking articles according to the present invention may be conveniently minimized or reduced.

  The second barrier may be adhered to the combustible heat source or may be attached separately.

  In certain preferred embodiments, the second barrier includes a non-flammable, substantially air impermeable second barrier coating provided on the inner surface of the one or more airflow channels. In such embodiments, preferably, the second barrier includes a second barrier coating provided on at least substantially the entire inner surface of the one or more airflow channels. More preferably, the second barrier includes a second barrier coating provided on the entire inner surface of the one or more airflow channels.

  In other embodiments, the second barrier coating may be provided by insertion of a liner into one or more airflow channels. For example, if the one or more airflow channels include one or more sealed airflow channels that extend through the interior of the combustible heat source, the nonflammable and substantially air impermeable hollow tube is It may be inserted into each of the one or more airflow channels.

  Depending on the desired characteristics and performance of the smoking article, the second barrier may have a low or high thermal conductivity. Preferably, the second barrier has a low thermal conductivity.

  The thickness of the second barrier may be appropriately adjusted to achieve excellent smoking performance. In certain embodiments, the second barrier may have a thickness between about 30 microns and about 200 microns. In preferred embodiments, the second barrier has a thickness between about 30 microns and about 100 microns.

  The second barrier may be formed from one or more suitable materials that are substantially thermally stable and non-combustible at temperatures achieved by the combustible heat source during ignition and combustion. . Suitable materials are known in the art and include, for example: clays; metal oxides such as iron oxide, alumina, titania, silica, silica-alumina, zirconia and ceria; zeolites; zirconium phosphates; and other ceramics Including but not limited to materials or combinations thereof.

  Preferred materials from which the second barrier can be formed include clay, glass, aluminum, iron oxide and combinations thereof. If necessary, a catalyst raw material component, such as a raw material component that promotes the oxidation of carbon monoxide to carbon dioxide, may be incorporated into the second barrier. Suitable catalyst feedstock components include, but are not limited to, for example, platinum, palladium, transition metals and oxides thereof.

  If the second barrier includes a second barrier coating provided on the inner surface of the one or more airflow channels, the second barrier can be formed by any suitable method, such as the method described in US-A-5,040,551. The barrier coating may be applied to the inner surface of the one or more airflow channels. For example, the inner surface of the one or more airflow channels may be sprayed, wetted or painted with a solution or suspension of the second barrier coating. In certain preferred embodiments, the second barrier coating is applied to the inner surface of the one or more air flow channels by the method described in WO-A2-2009 / 074870 as the combustible heat source is extruded.

  Preferably, the smoking article according to the present invention comprises an aerosol-forming substrate and an outer wrapper surrounding at least the rear part of the combustible heat source. The outer wrapper should hold the flammable heat source and the aerosol forming substrate of the smoking article when the smoking article is constructed.

  More preferably, the smoking article according to the present invention surrounds at least the rear part of the mouthpiece, the aerosol-forming substrate, any other components of the smoking article downstream of the aerosol-forming substrate and upstream of the mouthpiece and the combustible heat source. Includes outer wrapper.

  Preferably, the outer wrapper is substantially impermeable.

  A smoking article according to the present invention may include an outer wrapper formed from any suitable material or combination of materials. Suitable materials are well known in the art and include but are not limited to cigarette paper.

  One or more air inlets located between the rear face of the combustible heat source and the downstream end of the aerosol-forming substrate are in accordance with the present invention through which air can be drawn into one or more airflow paths. Provided in an outer wrapper and any other material surrounding the components of the smoking article.

  If the one or more air inlets include one or more first air inlets around the periphery of the aerosol forming substrate, the one or more first air inlets surround the aerosol forming substrate Provided in outer wrapper and any other material.

  If one or more air inlets include one or more second air inlets between the rear face of the flammable heat source and the aerosol-forming substrate, one or more second air inlets are , Provided in the outer wrapper and optional underlying material.

  Preferably, the combustible heat source is a carbonaceous heat source. As used herein, the term “carbonaceous” is used to describe a combustible heat source containing carbon. The carbon content of the combustible carbonaceous heat source for use in the smoking article according to the present invention is preferably at least about 35 percent, more preferably at least about 40 percent, and at least about 45 percent by dry weight of the combustible heat source. Is most preferred.

  In some embodiments, the combustible heat source according to the present invention is a combustible carbon-based heat source. As used herein, the term “carbon-based heat source” is used to describe a heat source consisting primarily of carbon.

  A combustible carbon-based heat source for use in a smoking article according to the present invention has a carbon content of at least about 50 percent. For example, a combustible carbon-based heat source for use in a smoking article according to the present invention has a carbon content of at least about 60 percent, or at least about 70 percent, or at least about 80 percent, depending on the dry weight of the combustible carbon-based heat source. You may have.

  A smoking article according to the present invention may include a combustible carbonaceous heat source formed from one or more suitable carbon-containing materials.

  If desired, one or more binders may be combined with one or more carbon-containing materials. Preferably, the one or more binders are organic binders. Suitable known organic binders include gums (eg guar gum), modified cellulose and cellulose derivatives (eg methylcellulose, carboxymethylcellulose, hydroxypropylcellulose and hydroxypropylmethylcellulose) flour, starch, sugar, vegetable oils and these Including, but not limited to.

  In one preferred embodiment, the combustible heat source is formed from a mixture of carbon powder, modified cellulose, flour and sugar.

Instead of or in addition to one or more binders, a flammable heat source for use in a smoking article according to the present invention may include one or more additives to improve the properties of the flammable heat source. . Suitable additives include additives that promote consolidation of flammable heat sources (eg, sintering aids), additives that promote ignition of flammable heat sources (eg, perchlorates, chlorates, nitrates, Oxidants such as oxides, permanganates, zirconium and combinations thereof), additives that promote the combustion of combustible heat sources (eg, potassium and potassium salts such as potassium citrate), and combustion of combustible heat sources Including, but not limited to, additives (eg, catalysts such as CuO, Fe ₂ O ₃ and Al ₂ O ₃ ) that promote the decomposition of one or more gases produced.

  Where the smoking article according to the present invention includes a first barrier coating provided on the rear side of the combustible heat source, such an additive may be used to apply the first barrier coating to the rear side of the combustible heat source. It may be incorporated into the flammable heat source before or after.

  In certain preferred embodiments, the combustible heat source is a combustible carbonaceous heat source comprising carbon and at least one ignition aid. In one preferred embodiment, the combustible heat source is a combustible carbonaceous heat source comprising carbon and at least one ignition aid, as described in WO-A1-2012 / 164077.

  As used herein, the term “ignition aid” refers to energy and oxygen during ignition of a combustible heat source when the release rate of one or both of the energy and oxygen by the material is not limited ambient oxygen diffusion. Used to mean a material that releases one or both. In other words, the rate of energy and / or oxygen release by the material during ignition of the combustible heat source is largely independent of the rate at which ambient oxygen can reach the material. Also, as used herein, the term “ignition aid” is used to mean an elemental metal that releases energy during ignition of a combustible heat source, and the ignition temperature of the elemental metal is from about 500 ° C. Low and the heat of combustion of elemental metals is at least about 5 kJ / g.

  As used herein, the term “ignition aid” refers to alkali metal salts of carboxylic acids (such as alkali metal citrate, alkali metal acetate and alkali metal succinate), alkali metal halides (alkali metal chloride). Salt), alkali metal carbonates or alkali metal phosphates, which are thought to modify carbon combustion. Such alkali metal combustion salts do not release sufficient energy during ignition of the combustible heat source, even when present in large quantities relative to the total weight of the combustible heat source, while smoking the initial cigarette, Produces an acceptable aerosol.

  Examples of suitable oxidizing agents are: nitrates such as potassium nitrate, calcium nitrate, strontium nitrate, sodium nitrate, barium nitrate, lithium nitrate, aluminum nitrate and iron nitrate; nitrites; other organic and inorganic nitro compounds; chlorates, Perchlorates such as sodium perchlorate; chlorites; bromates such as sodium bromate and potassium bromate; perbromates; brominated acid; Borate salts such as sodium borate and potassium borate; Ferrate salts such as barium ferrate; Ferrite; Manganates such as potassium manganate; Permanganate such as potassium permanganate Organic peroxides such as benzoyl peroxide and acetone peroxide; inorganic peroxides Such as hydrogen peroxide, strontium peroxide, magnesium peroxide, calcium peroxide, barium peroxide, zinc peroxide and lithium peroxide; superoxides such as potassium superoxide and sodium superoxide; iodates; Iodates; iodates; sulfates; sulfites; other sulfoxides; phosphates; phosphinates; phosphites; and phosphites.

  While advantageously improving the ignition and combustion characteristics of the flammable heat source, the inclusion of ignition and combustion additives can result in undesirable degradation and reaction products during use of the smoking article. For example, the decomposition of nitrate contained in a combustible heat source to assist in the ignition can result in the formation of nitrogen oxides.

  The inclusion of the non-flammable, substantially air-impermeable second barrier between the one or more airflow channels and the flammable heat source of the smoking article according to the present invention comprises one or more inhaled air Conveniently, such degradation and reaction products enter the air that is drawn into the smoking article according to the present invention through one or more airflow channels when passing through the plurality of airflow channels. Can be prevented or blocked.

  The combustible carbonaceous heat source for use in smoking articles according to the present invention may be made as described in the prior art known to those skilled in the art.

  A flammable carbonaceous heat source for use in smoking articles according to the present invention, when included, is preferably by mixing one or more carbon-containing materials with one or more binders and other additives. Is formed and preformed the mixture into the desired shape. The mixture of one or more carbons containing the material, one or more binders and optional other additives may be any suitable known, for example, casting, extrusion, injection molding and mold compression or pressing. The ceramic forming method may be used to preform the desired shape. In certain preferred embodiments, the mixture is preformed into the desired shape by pressing or extrusion or a combination thereof.

  Preferably, the mixture of one or more carbon-containing materials, one or more binders and other additives is preformed into an elongated rod. However, it will be appreciated that the mixture of one or more carbon-containing materials, one or more binders and other additives may be pre-shaped into other desired shapes.

  After formation, particularly after extrusion, the elongated rod or other desired shape is preferably dried to reduce its moisture content, and then, if present, sufficient to carbonize one or more binders. Pyrolysis in non-oxidizing atmosphere at moderate temperature and substantially removing any volatiles in the elongated rod or other shape. The elongated rod or other desired shape is preferably pyrolyzed in a nitrogen atmosphere at a temperature between about 700 ° C and about 900 ° C.

  In certain embodiments, the at least one metal nitrate is combustible by including at least one metal nitrate precursor in a mixture of one or more carbon-containing materials, one or more binders, and other additives. Built into the heat source. The at least one metal nitrate precursor is then subsequently converted in situ to at least one metal nitrate by treating a pyrolyzed preformed cylindrical rod or other shape with an aqueous solution of nitric acid. . In one embodiment, the combustible heat source includes at least one metal nitrate having a pyrolysis temperature below about 600 ° C, more preferably below about 400 ° C. The at least one metal nitrate is preferably from about 150 ° C to about 600 ° C, more preferably from about 200 ° C to about 400 ° C.

  In a preferred embodiment, exposure of the combustible heat source to a conventional yellow flame lighter or other ignition means should decompose at least one metal nitrate and release oxygen and energy. This decomposition causes an initial boost in the temperature of the combustible heat source and assists in ignition of the combustible heat source. After decomposition of at least one metal nitrate, the combustible heat source preferably continues to burn at a lower temperature.

  Inclusion of at least one metal nitrate advantageously produces an ignition of an internally initiated combustible heat source and not just at some point on its surface. The at least one metal nitrate is preferably present in the combustible heat source in an amount of about 20 percent to about 50 percent by dry weight of the combustible heat source.

  In other embodiments, the combustible heat source includes at least one peroxide or superoxide that actively releases oxygen at temperatures below about 600 ° C., more preferably at temperatures below about 400 ° C.

  Preferably, the at least one peroxide or superoxide is at a temperature between about 150 ° C. and about 600 ° C., more preferably at a temperature between about 200 ° C. and about 400 ° C., most preferably about Active release of oxygen at a temperature of 350 ° C.

  In use, exposure of a combustible heat source to a conventional yellow flame lighter or other ignition means should decompose at least one metal nitrate, releasing oxygen and energy. This decomposition causes an initial boost in the temperature of the combustible heat source and assists in ignition of the combustible heat source. After decomposition of the at least one peroxide or superoxide, the combustible heat source preferably continues to burn at a lower temperature.

  Inclusion of at least one metal nitrate advantageously produces an ignition of an internally initiated combustible heat source and not just at some point on its surface.

  The combustible heat source preferably has a porosity of about 20 percent to about 80 percent, more preferably about 20 percent to 60 percent. If the combustible heat source contains at least one metal nitrate, this will dissipate oxygen into the mass of combustible heat source at a rate sufficient to sustain combustion as the at least one metal nitrate decomposes and combustion proceeds Advantageously. More preferably, the combustible heat source has a porosity of about 50 percent to about 70 percent, for example about 50 percent to about 60 percent, as measured by mercury porosimetry or helium pycnometry. The required porosity can easily be achieved during the production of a combustible heat source using conventional methods and techniques.

Advantageously, the combustible carbonaceous heat source for use in a smoking article according to the present invention has an apparent density between about 0.6 g / cm ³ and about 1 g / cm ³ .

  The combustible heat source is preferably about 300 mg to about 500 mg, more preferably a mass of about 400 mg to about 450 mg.

  The length of the combustible heat source is preferably about 7 mm to about 17 mm, more preferably about 7 mm to about 15 mm, and most preferably about 7 mm to about 13 mm.

  The diameter of the combustible heat source is preferably about 5 mm to about 9 mm, and more preferably about 7 mm to about 8 mm.

  Preferably, the combustible heat source has a substantially uniform diameter. However, alternatively, the combustible heat source may be tapered such that the diameter of the rear portion of the combustible heat source is greater than the diameter of the front portion. A flammable heat source that is substantially cylindrical is particularly preferred. For example, the combustible heat source may be a cylinder or a tapered cylinder or cylinder with a substantially circular cross section or a tapered cylinder with a substantially elliptical cross section.

  The smoking article according to the present invention preferably comprises an aerosol forming substrate comprising at least one aerosol forming agent and material capable of releasing volatile compounds in response to heating. Aerosol-forming substrates may include other additives and ingredient components including but not limited to wetting agents, flavoring agents, binders and mixtures thereof.

  The aerosol forming substrate preferably comprises nicotine. More preferably, the aerosol forming substrate comprises tobacco.

  The at least one aerosol forming agent, in use, promotes the formation of a dense and stable aerosol, and is any suitable known compound or mixture of compounds that is substantially resistant to thermal degradation at the use temperature of the smoking article. It can be. Suitable aerosol forming agents are well known in the art and include, for example, polyhydric alcohols, esters of polyhydric alcohols such as glycerol mono, di or triacetate, and mono such as dimethyl dodecanedioate and dimethyl tetradecanedioate, Includes aliphatic esters of di- or polycarboxylic acids. Preferred aerosol formers for use in smoking articles according to the present invention are polyhydric alcohols such as triethylene glycol, 1,3-butanediol, and most preferred glycerin or mixtures thereof.

  The material capable of emitting volatile compounds in response to heating may be a plant-based material charge. The material capable of emitting volatile compounds in response to heating may be a homogenized plant-based material charge. For example, the aerosol-forming substrate may include one or more plant-derived materials: including but not limited to tobacco; tea, such as green tea; mint; laurel; eucalyptus; basil; sage;

  Preferably, the material capable of radiating volatile compounds in response to heating is a tobacco base material charge, most preferably a homogenized tobacco base material charge.

  The aerosol-forming substrate may be in the form of a plug or segment comprising a material that can be radiated of volatile compounds in response to heating, surrounded by paper or other wrapper. As mentioned above, 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 an aerosol-forming substrate.

  Preferably, the aerosol-forming substrate has a length between about 5 mm and about 20 mm, more preferably between about 8 mm and about 12 mm.

  In a preferred embodiment, the aerosol forming substrate comprises a plug of tobacco based material encased in a plug wrap. In certain preferred embodiments, the aerosol-forming substrate comprises a plug of homogenized tobacco base material wrapped in a plug wrap.

  Preferably, the smoking article according to the invention further comprises a heat conducting element around the rear part of the combustible heat source and at least around the front part of the aerosol-forming substrate. The heat conducting element is preferably combustion resistant. In certain embodiments, the heat transfer element is oxygen limited. In other words, the heat transfer element prevents or resists the passage of oxygen through the heat transfer element to the combustible heat source.

  In certain embodiments, the heat transfer element may be in direct contact with both the rear portion of the combustible heat source and the aerosol-forming substrate. In such embodiments, the heat transfer element provides a thermal link between the combustible heat source according to the present invention and the aerosol-forming substrate of the smoking article.

  In other embodiments, the heat transfer element may be separate from one or both of the rear portion of the combustible heat source and the aerosol-forming substrate, so that the heat transfer element and the rear portion of the combustible heat source and the aerosol-forming substrate There is no direct contact between one or both.

  Suitable thermally conductive elements for use in smoking articles according to the present invention include but are limited to metal foil wrappers such as aluminum foil wrappers, steel wrappers, iron foil wrappers and copper foil wrappers; and metal alloy foil wrappers Not.

  Preferably, the rear portion of the combustible heat source surrounded by the heat conducting element is between about 2 mm and about 8 mm in length, more preferably between about 3 mm and about 5 mm.

  Preferably, the front portion of the combustible heat source not surrounded by the heat conducting element is between about 4 mm and about 15 mm in length, more preferably between about 5 mm and about 8 mm.

  In certain embodiments, the entire length of the aerosol-forming substrate may be surrounded by a heat conducting element.

  In other embodiments, the heat transfer element may surround only the front portion of the aerosol-forming substrate. In such an embodiment, the aerosol-forming substrate extends downstream beyond the heat transfer element.

  In embodiments in which the heat transfer element surrounds only the forward portion of the aerosol-forming substrate, the aerosol-forming substrate extends preferably at least about 3 mm downstream beyond the heat transfer element. More preferably, the aerosol-forming substrate extends between about 3 mm and about 10 mm downstream beyond the heat transfer element. However, the aerosol-forming substrate may extend less than 3 mm downstream beyond the heat transfer element.

  Preferably, the forward portion of the aerosol-forming substrate surrounded by the heat transfer element is between about 1 mm and about 10 mm in length, more preferably between about 2 mm and about 8 mm, most preferably between about 2 mm and 6 mm. Is the length between.

  A smoking article according to the present invention includes a mouthpiece downstream of the aerosol-forming substrate.

  Preferably, the mouthpiece has low filtration efficiency, more preferably very low filtration efficiency. The mouthpiece may be a single segment or component mouthpiece. Alternatively, the mouthpiece may be a multi-part or multi-component mouthpiece.

  The mouthpiece may include a filter that includes one or more segments that include a suitable known filtration material. Suitable filtration materials are known in the art and include, but are not limited to, cellulose acetate and paper. Alternatively or additionally, the mouthpiece may include one or more segments that include absorbents, adsorbents, and other aerosol modifiers and additives or combinations thereof.

  The smoking article according to the element preferably further comprises a transmission element or spacer element between the aerosol-forming substrate and the mouthpiece.

  The transmission element may contact one or both of the aerosol-forming substrate and the mouthpiece. Alternatively, the transmission element may be remote from one or both of the aerosol forming substrate and the mouthpiece.

  The encapsulation of the transfer element advantageously allows for cooling of the aerosol produced by heat transfer from the combustible heat source to the aerosol-forming substrate. Also, the encapsulation of the transmission element allows the overall length of the smoking article according to the present invention to be adjusted to a desired value, for example similar to that of a conventional cigarette, through appropriate selection of the length of the transmission element. Is conveniently possible.

  The transmission element may have a length between about 7 mm and about 50 mm, such as between about 10 mm and about 45 mm or between about 15 mm and about 30 mm. The transfer element may have other lengths depending on the desired overall length of the smoking article and the presence and length of other components within the smoking article.

  Preferably, the transmission element comprises at least one open tubular hollow body. In such embodiments, in use, air that is drawn into the smoking article through one or more air inlets passes downstream from the aerosol-forming substrate to the mouthpiece through the smoking article, Pass through an open tubular hollow body with at least one end.

  The transfer element has at least one open end formed from one or more suitable materials that are substantially thermally stable at the temperature of the aerosol generated by heat transfer from the combustible heat source to the aerosol-forming substrate. A tubular hollow body may be included. Suitable materials are known in the art and include, but are not limited to, paper, cardboard, plastic, such cellulose acetate, ceramic and combinations thereof.

  Alternatively or in addition, the smoking article according to the present invention may include an aerosol cooling element or heat exchanger between the aerosol-forming substrate and the mouthpiece. The aerosol cooling element may include a plurality of longitudinally extending channels.

  The aerosol cooling element may comprise a sheet of pleated material 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. A pleated material sheet selected from the group may be included.

  In certain preferred embodiments, the aerosol cooling element includes pleats of biodegradable polymeric material such as polylactic acid (PLA) or Mater-Bi® grade (a commercial family of starch-based copolyesters). The attached sheet may be included.

  Smoking articles according to the present invention may include one or more aerosol modifiers downstream of the aerosol-forming substrate. For example, one or more of the mouthpiece, transmission element, and aerosol cooling element of a smoking article according to the present invention may include one or more aerosol modifiers.

  Suitable aerosol modifiers include: but are not limited to: flavoring agents; and chemosensory agents.

  As used herein, the term “flavoring agent” is used to describe any agent that, in use, imparts one or both of taste and aroma to the aerosol produced by the aerosol-forming substrate of the smoking article.

  As used herein, the term “chemosensory agent” is used in any sense perceived in the user's mouth, or olfactory cavity by means other than or in addition to perception via taste receptors or olfactory receptor cells. Used to describe drugs. Chemosensory perception typically goes through either the trigeminal nerve, the glossopharyngeal nerve, the vagus nerve, or some combination thereof, and typically through a “trigeminal nerve response”. Typically, chemosensory agents are perceived as hot, spicy, cooling or soothing sensations.

  A smoking article according to the present invention may include one or more aerosol modifiers that are both flavoring agents and chemosensory agents downstream of the aerosol-forming substrate. For example, one or more of the mouthpiece, transmission element, and aerosol cooling element of a smoking article according to the present invention may include menthol or another flavoring agent that provides a cooling chemosensory effect.

  Smoking articles according to the present invention are assembled using known methods and machines.

The invention will be further described, by way of example only, with reference to the following accompanying drawings.
1 shows an exploded view of a smoking article according to a first embodiment of the present invention. FIG. FIG. 4 shows an exploded view of a smoking article according to a second embodiment of the present invention. FIG. 6 shows an exploded view of a smoking article according to a fourth embodiment of the present invention. FIG. 7 shows an exploded view of a smoking article according to a fifth embodiment of the present invention. FIG. 10 shows an exploded view of a smoking article according to a seventh embodiment of the present invention. FIG. 10 shows an exploded view of a smoking article according to an eighth embodiment of the present invention. 1a shows a schematic longitudinal cross section of a smoking article according to the first embodiment of the invention shown in FIG. 1a). FIG. 1b shows a schematic longitudinal cross-section of a smoking article according to the second embodiment of the invention shown in FIG. 1b).

  A smoking article 2 according to the first embodiment of the invention shown in FIGS. 1a) and 2 comprises a combustible heat source 4, an aerosol-forming substrate 10 having a front face 6 and an opposite rear face 8 in contact with a coaxial arrangement. , Including a transfer element 12 and a mouthpiece 14. As shown in FIG. 2, the aerosol-forming substrate 10, the transfer element 12 and the mouthpiece 14, and the rear part of the combustible heat source 4 are wrapped in an outer wrapper 16 of a low-breathable sheet material such as, for example, cigarette paper.

  The combustible heat source 4 includes a central airflow channel 18 (shown by a dotted line in FIG. 1a) extending from the front surface 6 to the rear surface 8 of the combustible heat source 4.

  The aerosol-forming substrate 12 is located immediately downstream of the rear face 8 of the combustible heat source 4. The aerosol-forming substrate 12 includes a cylindrical plug of homogenized tobacco base material 20 that includes an aerosol-forming agent, such as glycerin, wrapped in a plug wrap 22.

  The transmission element 12 is located immediately downstream of the aerosol-forming substrate 12 and includes a cylindrical end-open hollow tube 24 of a suitable material such as, for example, paper, cardboard or cellulose acetate tow.

  The mouthpiece 14 is located immediately downstream of the transmission element 12 at the proximal end of the smoking article 2. The mouthpiece 14 includes a cylindrical plug of suitable filtration material 26, such as cellulose acetate tow, for example, of very low filtration efficiency, wrapped in a filter plug wrap 28.

  The smoking article may further include a band of tipping paper (not shown) that surrounds the downstream end portion of the outer wrapper 16.

  As shown in FIG. 2, the smoking article 2 is a suitable material, such as aluminum, around and in contact with the rear portion 4b of the combustible carbonaceous heat source 4 and the adjacent front portion 10a of the aerosol-forming substrate 10. Further included is a heat conductive element 30 of foil. In the smoking article 2 according to the first embodiment of the present invention shown in FIG. 2, the aerosol-forming substrate extends downstream beyond the heat conducting element 30. That is, the heat transfer element 30 is not around and does not contact the rear portion of the aerosol-forming substrate 10. However, it will be appreciated that in other embodiments of the present invention (not shown), the heat transfer element 30 may be around and in contact with the entire length of the aerosol-forming substrate 10.

  The smoking article 2 according to the first embodiment of the present invention includes one or more air inlets located downstream of the rear face 8 of the combustible heat source 4 and upstream of the mouthpiece 14. One or more air inlets are located between the rear face 8 of the combustible heat source 4 and the downstream end of the aerosol-forming substrate 10 and are located around the periphery of the aerosol-forming substrate 10 A first inlet 32 is included.

  As shown in FIG. 2, the peripheral arrangement of the first air inlet 32 is provided to the plug wrap 22 and covering outer wrapper 16 of the aerosol-forming substrate 10 and is dotted to cold air (FIG. 1a) and 2). Place in the aerosol-forming substrate 10 (indicated by the arrow). In other embodiments of the present invention where the heat transfer element 30 is around and in contact with the entire length of the aerosol-forming substrate 10 (not shown), the peripheral arrangement of the first air inlet 32 is such that the aerosol-forming substrate 10 It will be appreciated that cold air can be introduced into the aerosol-forming substrate 10 provided to the plug wrap 22, the covering heat transfer element 30 and the covering outer wrapper 16.

  In use, the user ignites the combustible heat source 4 of the smoking article 2 according to the first embodiment of the present invention and then inhales in the mouthpiece 14. When the user inhales in the mouthpiece 14, air (shown by a dotted arrow in FIG. 1a) and 2 is drawn into the smoking article 2 through the central airflow channel 18 of the combustible heat source 4, and it is combustible It is heated when passing through the central air flow channel 18 of the heat source 4. Also, when the user inhales in the mouthpiece 14, cold air (shown by dotted arrows in FIG. 1a) and 2 is drawn into the aerosol-forming substrate 10 of the smoking article 2 through the first air inlet 32.

  The heated air drawn through the central air flow path 18 of the combustible heat source 4 is forced by convection as it passes downstream through the aerosol-forming substrate 10 toward the mouthpiece 14 of the smoking article 2. The aerosol forming substrate 10 is heated. Also, the front portion 10a of the aerosol-forming substrate 10 is heated by conduction through the adjacent rear face 8 of the combustible heat source 4 and the heat conducting element 28.

  Heating the aerosol-forming substrate 10 by conduction and forced convection releases glycerin and other volatile and semi-volatile compounds from the plug of homogenized tobacco base material 20. The compound released from the aerosol-forming substrate 10 passes through the air that is drawn through the central airflow channel 18 of the combustible heat source 4 and the first air inlet 32 as it flows through the aerosol-forming substrate 10. Thus, an aerosol mixed in the air sucked into the aerosol forming substrate 10 of the smoking article 2 is formed. Inhaled air and entrained aerosol (shown by dashed arrows in FIG. 1a) and 2) pass downstream through the transmission element 12, where they cool and condense. Cooled inhaled air and entrained aerosol pass downstream through the mouthpiece 14 and to the user through the proximal end of the smoking article 2 according to the first embodiment of the present invention. Delivered.

  The smoking article 34 according to the second embodiment of the invention shown in FIGS. 1b) and 3 is almost similar in structure to the smoking article according to the first embodiment of the invention shown in FIGS. 1a) and 2. It is. However, in the smoking article 34 according to the second embodiment of the present invention, the combustible heat source 4 and the aerosol forming substrate 10 are separated from each other, and the rear surface 8 of the combustible heat source 4 and the downstream of the aerosol forming substrate 10. The one or more air inlets located between the ends include one or more second air inlets 36 located between the rear face 8 of the combustible heat source 4 and the aerosol-forming substrate 10. .

  As shown in FIG. 3, the peripheral arrangement of the second air inlet 36 is a covering outer wrapper between the heat conducting element 30 and the rear face 8 of the combustible heat source 4 and the upstream end of the aerosol-forming substrate 10. Provided at 16, cool air (shown by the dashed arrows in FIG. 1 b) and 3) is placed in the space between the combustible heat source 4 and the aerosol-forming substrate 10.

  In use when the user inhales in the mouthpiece 14 of the smoking article 34 according to the second embodiment of the invention, the air (shown by the dotted arrows in FIG. 1b) and 3 is the center of the combustible heat source 4 Smoked air is drawn into the smoking article 34 through the airflow channel 18, and also cold air is drawn into the space between the combustible heat source 4 and the aerosol-forming substrate 10 through the second air inlet 36.

  Heated air drawn through the central airflow channel 18 of the combustible heat source 4 is aerosolized by convection as it passes downstream through the aerosol-forming substrate 10 toward the mouthpiece 14 of the smoking article 34. The forming substrate 10 is heated. Also, the front portion 10a of the aerosol-forming substrate 10 is heated by conduction through the heat conducting element 28.

  Heating the aerosol-forming substrate 10 by conduction and convection releases glycerin and other volatile and semi-volatile compounds from the plug of homogenized tobacco base material 20. The compound released from the aerosol-forming substrate 10 passes through the air flowing through the aerosol-forming substrate 10 through the central air flow path 18 of the combustible heat source 4 and the second air inlet 36. Thus, an aerosol mixed in the air sucked into the space between the combustible heat source 4 and the aerosol forming substrate 10 is formed. Inhaled air and entrained aerosol (shown by dashed arrows in FIG. 1b) and 3) pass downstream through the transmission element 12, where they cool and condense. Cooled inhaled air and entrained aerosol pass downstream through the mouthpiece 14 and to the user through the proximal end of the smoking article 34 according to the second embodiment of the present invention. Delivered.

  The smoking article (not shown) according to the third embodiment of the present invention is almost similar in structure to the smoking article according to the second embodiment of the present invention shown in FIGS. 1b) and 3. However, in the smoking article according to the third embodiment of the present invention, the one or more air inlets located between the rear face of the combustible heat source and the downstream end of the aerosol-forming substrate are shown in FIG. One or more second air inlets located between the rear surface of the combustible heat source 4 and the aerosol-forming substrate 10, as in the smoking article according to the second embodiment of the invention shown in FIG. The first air located around the periphery of the aerosol-forming substrate, as in the mouth and also one or more smoking articles according to the first embodiment of the invention shown in FIGS. 1a) and 2 Including the inlet.

  In use when a user inhales in a mouthpiece of a smoking article according to the third embodiment of the present invention, air is drawn into the smoking article through the central air flow channel of the combustible heat source, and also cold air Is drawn into the space between the combustible heat source and the aerosol-forming substrate through the second air inlet and into the aerosol-forming substrate of the smoking article through the first air inlet.

  A flammable carbonaceous heat source for use in a smoking article according to the first, second and third embodiments of the present invention follows Example 1 below by omitting the second barrier coating of clay. It may be produced.

  The air drawn through the aerosol-forming substrate of the smoking article according to the first, second and third embodiments of the present invention entering the smoking article through the central air flow path of the combustible heat source is As it passes through the flow path, it comes into direct contact with the combustible part of the combustible heat source. Also, the air sucked through the aerosol-forming substrate of the smoking article according to the first, second and third embodiments of the present invention entering the smoking article through the central air flow channel is the rear face of the combustible heat source Direct contact with.

  The smoking article 38 according to the fourth embodiment of the invention shown in FIG. 1c) is almost the same structure as the smoking article according to the first embodiment of the invention shown in FIGS. 1a) and 2. . However, in the smoking article 38 according to the fourth embodiment of the present invention, the non-flammable and substantially air impermeable first barrier 40 is formed between the rear surface 8 of the combustible heat source 4 and the aerosol-forming substrate 10. Offered in between. As shown in FIG. 1c), the first barrier 40 includes a non-flammable, substantially air-impermeable first barrier coating provided over the rear face 8 of the flammable heat source 4, and is flammable. The central airflow channel 18 of the heat source 4 extends through the first barrier coating.

  As a result of the encapsulation of the first barrier coating, the aerosol-forming substrate 10 of the smoking article 38 according to the fourth embodiment of the present invention is not in direct contact with the rear face 8 of the combustible carbonaceous heat source 4.

  As a result of the encapsulation of the first barrier coating, the air that is inhaled in use and through the central air flow path 18 of the combustible heat source 4 through the smoking article 38 according to the fourth embodiment of the present invention is There is no direct contact with the rear face 8 of the combustible carbonaceous heat source 4. In addition, as a result of the encapsulation of the first barrier coating, in use, the cold air drawn into the aerosol-forming substrate 10 of the smoking article 38 according to the fourth embodiment of the present invention through the first air inlet 32 is Do not directly contact the rear face 8 of the combustible carbonaceous heat source 4.

  However, the air sucked through the aerosol-forming substrate 10 of the smoking article 38 according to the fourth embodiment of the present invention that enters the smoking article 38 through the central airflow channel 18 of the combustible heat source 4 is centered on it. As it passes through the air flow channel 18, it is in direct contact with the combustible portion of the combustible heat source.

  The smoking article 42 according to the fifth embodiment of the invention shown in FIG. 1d) is almost the same structure as the smoking article according to the second embodiment of the invention shown in FIGS. 1b) and 3. . However, in the smoking article 42 according to the fifth embodiment of the present invention, the non-flammable and substantially air impermeable first barrier 40 is formed between the rear surface 8 of the combustible heat source 4 and the aerosol-forming substrate 10. Offered in between. As shown in FIG. 1d), the first barrier 40 includes a non-flammable, substantially air-impermeable first barrier coating provided over the rear face 8 of the flammable heat source 4, and is flammable. The central airflow channel 18 of the heat source 4 extends through the first barrier coating.

  As a result of the encapsulation of the first barrier coating, in use, the air drawn into the smoking article 42 according to the fifth embodiment of the present invention through the central air flow path 18 of the combustible heat source 4 is combustible carbonaceous. There is no direct contact with the rear face 8 of the heat source 4. In addition, as a result of encapsulation of the first barrier coating, in use, the aerosol-forming substrate 10 of the flammable heat source 4 and the smoking article 42 according to the fifth embodiment of the present invention through the second air inlet 36. The cold air sucked into the space between them does not come into direct contact with the rear surface 8 of the combustible carbonaceous heat source 4.

  However, the air sucked through the aerosol-forming substrate 10 of the smoking article 42 according to the fifth embodiment of the present invention entering the smoking article 42 through the central air flow channel 18 of the combustible heat source 4 is centered on it. As it passes through the air flow channel 18, it is in direct contact with the combustible portion of the combustible heat source.

  The smoking article (not shown) according to the sixth embodiment of the present invention has almost the same structure as the smoking article (not shown) according to the third embodiment of the present invention. However, in the smoking article according to the sixth embodiment of the present invention, the first non-flammable and substantially air impermeable barrier is provided between the rear surface of the combustible heat source and the aerosol-forming substrate. . The first barrier includes a non-flammable, substantially air impermeable first barrier coating provided over the entire rear surface of the combustible heat source, and the central air flow path of the combustible heat source is the first barrier. Extends through the coating.

  As a result of the encapsulation of the first barrier coating, in use, the air drawn into the smoking article according to the sixth embodiment of the present invention through the central air flow channel of the combustible heat source is behind the combustible carbonaceous heat source. Do not make direct contact with the direction. In addition, as a result of the encapsulation of the first barrier coating, in use, between the combustible heat source and the aerosol-forming substrate of the smoking article according to the sixth embodiment of the present invention through the second air inlet The cold air drawn into the space and through the first air inlet into the aerosol-forming substrate of the smoking article according to the sixth embodiment of the present invention does not directly contact the rear face of the combustible carbonaceous heat source.

  However, the air sucked through the aerosol-forming substrate of the smoking article according to the sixth embodiment of the present invention that enters the smoking article through the central airflow channel of the combustible heat source passes through the central airflow channel. When in direct contact with the flammable part of the flammable heat source.

  Combustible carbonaceous heat sources for use in smoking articles according to the fourth, fifth and sixth embodiments of the present invention may be made according to Examples 2, 3 and 4 below.

  The smoking article 44 according to the seventh embodiment of the invention shown in FIG. 1e) is almost similar in structure to the smoking article according to the first embodiment of the invention shown in FIGS. 1a) and 2. . However, in the smoking article 44 according to the seventh embodiment of the present invention, the non-flammable and substantially air impermeable second barrier 46 (shown by dashed lines in FIG. 1e) is Provided between the central airflow channel 18. The second barrier 46 includes a non-flammable, substantially air impermeable second barrier coating that is provided over the entire inner surface of the central airflow channel 18.

  As a result of the encapsulation of the second barrier coating, in use, the air sucked into the smoking article 38 according to the seventh embodiment of the present invention through the central air flow channel 18 of the combustible heat source 4 is When passing through the flow path 18, it does not come into direct contact with the combustible portion of the combustible carbonaceous heat source 4.

  However, the air sucked through the aerosol-forming substrate 10 of the smoking article 44 according to the seventh embodiment of the present invention that enters the smoking article 44 through the central air flow path 18 of the flammable heat source 4 is a flammable heat source. Direct contact with 4 rear face 8.

  The smoking article 48 according to the eighth embodiment of the invention shown in FIG. 1f) is almost similar in structure to the smoking article according to the second embodiment of the invention shown in FIGS. 1b) and 3. . However, in the smoking article 48 according to the eighth embodiment of the present invention, the non-flammable and substantially air impermeable second barrier 46 (shown by the dashed line in FIG. 1f) is connected to the combustible heat source 4 and Provided between the central airflow channel 18. The second barrier 46 includes a non-flammable, substantially air impermeable second barrier coating that is provided over the entire inner surface of the central airflow channel 18.

  As a result of the encapsulation of the second barrier coating, in use, the air that is drawn into the smoking article 48 according to the eighth embodiment of the present invention through the central airflow channel 18 of the combustible heat source 4 is the central airflow. There is no direct contact with the combustible carbonaceous heat source 4 when passing through the flow path 18.

  However, the air sucked through the aerosol-forming substrate 10 of the smoking article 48 according to the eighth embodiment of the present invention that enters the smoking article 48 through the central airflow channel 18 of the flammable heat source 4 is a flammable heat source. Direct contact with 4 rear face 8. In addition, the cold air drawn through the second air inlet 36 into the space between the combustible heat source 4 and the aerosol-forming substrate 10 of the smoking article 48 according to the eighth embodiment of the present invention is Direct contact with the rear face 8 of the combustible heat source 4.

  The smoking article (not shown) according to the ninth embodiment of the present invention has almost the same structure as the smoking article (not shown) according to the third embodiment of the present invention. However, in the smoking article according to the ninth embodiment of the present invention, a non-flammable and substantially air impermeable second barrier is provided between the combustible heat source and the central air flow channel. The second barrier includes a non-flammable, substantially air impermeable second barrier coating that is provided over the entire inner surface of the central airflow channel.

  As a result of the encapsulation of the second barrier coating, in use, air that is drawn into the smoking article according to the ninth embodiment of the present invention through the central airflow channel of the combustible heat source, will pass through the central airflow channel. When in transit, do not come into direct contact with combustible carbonaceous heat sources.

  However, the air drawn through the aerosol-forming substrate of the smoking article according to the ninth embodiment of the present invention that enters the smoking article through the central air flow path of the combustible heat source is directly with the rear face of the combustible heat source. Contact. In addition, the cold air drawn through the second air inlet into the space between the combustible heat source and the aerosol-forming substrate of the smoking article according to the ninth embodiment of the present invention is also a combustible heat source. Direct contact with the rear surface.

  A combustible carbonaceous heat source for use in smoking articles according to the seventh, eighth and ninth embodiments of the present invention may be made according to Example 1 below.

Example 1-Preparation of a flammable carbonaceous heat source comprising a second barrier coating of clay A flammable cylindrical carbonaceous heat source for use in a smoking article according to the present invention is disclosed in WO-A2-2009 / 074870 A2. Or it may be made as described in any other prior art known to those skilled in the art. The aqueous slurry is extruded through a mold having a central section opening with a circular cross-section for making a flammable heat source, as described in WO-A2-2009 / 074870 A2. The mold opening has a diameter of 8.7 mm to form a cylindrical rod, a length between about 20 cm and about 22 cm, and a diameter between about 9.1 cm and about 9.2 mm. A single longitudinal airflow channel is formed in the cylindrical rod by a mandrel attached centrally at the mold opening. The mandrel preferably has a circular cross section with an outer diameter of approximately 2 mm or approximately 3.5 mm. Alternatively, three airflow channels are formed in a cylindrical rod using three mandrels with a circular cross section having an outer diameter of approximately 2 mm attached at a regular angle at the mold opening. During the extrusion of the cylindrical rod, a clay-based coating slurry (made using clay such as natural green clay) is pumped through a supply passage that extends through the center of the mandrel or mandrels. Forming a thin second barrier coating of about 150 microns to about 300 microns on the inner surface of the airflow channel or channels. The cylindrical rod is dried at a temperature of about 20 ° C. to about 25 ° C. under a relative humidity of about 40% to about 50% for about 12 hours to about 72 hours, and then about 240 minutes to about 750 ° C. Pyrolysis in ambient air. After pyrolysis, the cylindrical rod is cut to a defined diameter using a grinder and molded to form individual combustible carbonaceous heat sources. The rod after cutting and molding has a length of about 11 mm, a diameter of about 7.8 mm and a dry mass of about 400 mg. Individual combustible carbonaceous heat sources are then dried at about 130 ° C. for approximately 1 hour.

Example 2-Production of a flammable carbonaceous heat source comprising a bentonite / kaolinite first barrier coating Bentonite / kaolinite non-flammable, substantially air impervious first barrier coating is described in Example 1. Provided on the rear side of the combustible carbonaceous heat source made as such, but without the second barrier coating of clay. The first barrier coating is provided by dipping, brushing or spray painting. Immersion involves inserting the rear face of the combustible carbonaceous heat source into the concentrated bentonite / kaolinite solution. The bentonite / kaolinite solution for soaking contains 3.8% bentonite, 12.5% kaolinite and 83.7% H ₂ O [m / m]. The rear face of the combustible carbonaceous heat source is immersed in the bentonite / kaolinite solution for about 1 second, and the meniscus can disappear as a result of the permeation of the solution into the carbon pores on the rear face surface of the combustible carbonaceous heat source To. Brushing involves immersing the brush in a concentrated bentonite / kaolinite solution and applying the concentrated bentonite / kaolinite solution on the brush to the back surface of the combustible carbonaceous heat source until covered. The bentonite / kaolinite solution for brushing contains 3.8% bentonite, 12.5% kaolinite and 83.7% H ₂ O [m / m].

  After application of the nonflammable and substantially air impermeable first barrier coating by dipping or brushing, the combustible carbonaceous heat source is dried in an oven at about 130 ° C. for approximately 30 minutes and about 5% overnight. Place in a desiccator under relative humidity.

The spray coating is preferably 3.6% bentonite, 18.0% kaolinite and 78.4% H at a shear rate of about 100 s ^-1 when measured with a rheometer (Physica MCR 300, coaxial cylinder arrangement). A suspension solution containing ₂ O [m / m] and having a viscosity of about 50 mPa · s is included. Spray painting is performed with a Sata MiniJet 3000 spray gun using a 0.5 mm, 0.8 mm or 1 mm spray nozzle on an SMC EMY2B linear actuator at a speed of about 10 mm / s to about 100 mm / s. The following spray parameters are used: sample-pistol distance 15 cm; sample speed 10 mm / s; spray nozzle 0.5 mm; spray jet plane and spray pressure 2.5 bar. In a single spray painting event, a coating thickness of about 11 microns is typically obtained. Repeat spraying 3 times. Between each spray coating, the combustible carbonaceous heat source is dried for about 10 minutes at room temperature. After application of the nonflammable, substantially air impermeable first barrier coating, the combustible carbonaceous heat source is pyrolyzed at about 700 ° C. for approximately 1 hour.

Example 3-Creation of a flammable carbonaceous heat source comprising a first barrier coating of glass A non-flammable, substantially air impermeable first barrier coating of glass is made as described in Example 1. Provided on the rear side of the combustible carbonaceous heat source, but without the clay's second barrier coating. The first barrier coating is provided by spray painting. Spray painting with glass is done with ground glass suspension using fine powder. For example, 37.5% glass powder (3 μm) with a viscosity of 120 mPa · s, 2.5% methylcellulose and 60% water or 37.5% glass powder (3 μm) with a viscosity of 60 to 100 mPa · s, 3.0% Use a spray coating suspension containing either 10% bentonite powder and 59.5% water. Compositions corresponding to glasses 1, 2, 3 and 4 in Table 3 and glass powders having physical properties may be used.

Spray painting is done with a Sata MiniJet 3000 spray gun using a 0.5mm, 0.8mm or 1mm spray nozzle on an SMC EMY2B linear actuator at a speed of about 10mm / s to about 100mm / s. Repeat spraying several times, preferably. After finishing the spraying, the combustible carbonaceous heat source is pyrolyzed at about 700 ° C. for approximately 1 hour.

Table 3 Composition of glass at weight percent calculated from the composition, transformation temperature Tg, coefficient of thermal expansion A _20-300 and KI-value Example 4-of a combustible carbonaceous heat source comprising a first barrier coating of aluminum Fabrication A first barrier coating of non-flammable and substantially air impermeable aluminum is provided on the back side of a combustible carbonaceous heat source fabricated as described in Example 1, but the second of the clay. No barrier coating. The first barrier coating is provided by a laser that cuts the aluminum barrier from an aluminum bobbin band having a thickness of about 20 microns. The aluminum barrier has a single hole with a diameter of about 7.8 mm and an outer diameter of about 1.8 mm in the center to match the cross-sectional area of the combustible carbonaceous heat source of Example 1. In an alternative embodiment, the aluminum barrier has three holes, which are arranged to be aligned with the three air flow channels provided to the combustible carbonaceous heat source. The aluminum barrier coating is formed by adhering the aluminum barrier to the rear surface of the combustible carbonaceous heat source using any suitable adhesive.

  In use, the cold air drawn into one or more air inlets located between the rear face of the flammable heat source and the downstream end of the aerosol-forming substrate is the first to the present invention while the user is smoking. Reduce the temperature of the aerosol-forming substrate 10 of the smoking article 2, 34, 38, 42, 44, 48 according to the nine embodiments.

  This conveniently prevents or prevents spikes in the temperature of the aerosol-forming substrate 10 while the user smokes, and smoking articles 2, 34, 38, according to the first to ninth embodiments of the present invention. Conveniently minimizes or reduces the impact of the user's cigarette situation on 42, 44, 48 mainstream aerosol compositions.

  The specific embodiments described above are intended to illustrate the present invention. However, it should be understood that other embodiments may be made without departing from the spirit and scope of the invention as set forth in the claims and that the specific embodiments described above are not intended to be limiting. It is.

Claims (15)

Smoking article:
A flammable heat source having opposed front and rear surfaces;
One or more airflow channels extending from the front surface to the rear surface of the combustible heat source;
An aerosol-forming substrate downstream of the rear face of the combustible heat source;
A mouthpiece downstream of the aerosol-forming substrate; and one or more air inlets located downstream of the rear face of the combustible heat source and upstream of the mouthpiece, the one or more air inlets being flammable A suction port located between the rear face of the heat source and the downstream end of the aerosol-forming substrate,
A smoking article comprising:
In use, air drawn through the aerosol-forming substrate enters the smoking article through one or more airflow channels and one or more air inlets, and air that is drawn through the aerosol-forming substrate. A smoking article that is in direct contact with at least a portion of the combustible portion of the combustible heat source.   2. The smoking article according to claim 1, further comprising an outer wrapper surrounding at least a rear portion of the aerosol-forming substrate and the combustible heat source.   A smoking article according to claim 1, comprising: (i) a non-flammable, substantially air-impermeable first barrier between the rear face of the flammable heat source and the aerosol-forming substrate; and (ii) flammable. A smoking article further comprising one of a non-flammable and substantially air impermeable second barrier between the heat source and the one or more airflow channels.   2. The smoking article according to claim 1, comprising: (i) a non-flammable and substantially air impermeable first barrier between a rear surface of the combustible heat source and the aerosol-forming substrate. A smoking article comprising a first barrier coating provided on a rear surface of a combustible heat source.   The smoking article of claim 1, comprising (ii) a non-flammable and substantially air impermeable second barrier between the combustible heat source and the one or more airflow channels, The smoking article, wherein the barrier comprises a second barrier coating provided on an inner surface of the one or more airflow channels.   The smoking article according to any preceding claim, wherein the one or more air inlets comprise one or more first air inlets around the periphery of the aerosol-forming substrate, Smoking articles.   A smoking article according to any preceding claim, wherein the aerosol-forming substrate contacts the rear face of the combustible heat source.   The smoking article according to any one of claims 1 to 6, wherein the aerosol-forming substrate is separated from the rear surface of the combustible heat source.   The smoking article of claim 8, wherein the one or more air inlets include one or more second air inlets between the rear surface of the combustible heat source and the aerosol-forming substrate. Smoking articles. A smoking article according to any preceding claim, wherein:
A smoking article further comprising a heat conducting element around a rear portion of the combustible heat source and at least a front portion of the aerosol-forming substrate.   A smoking article according to any preceding claim, wherein the aerosol-forming substrate comprises a tobacco base material and at least one aerosol-forming agent.   A smoking article according to any preceding claim, wherein the combustible heat source is a combustible carbonaceous heat source.   A smoking article according to any preceding claim, wherein the combustible heat source comprises an ignition aid. A smoking article according to any preceding claim, wherein:
A smoking article further comprising a transmission element between the aerosol-forming substrate and the mouthpiece.   A smoking article according to any preceding claim, further comprising one or more aerosol modifiers downstream of the aerosol-forming substrate.

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