KR102500004B1 - Smoking article comprising a combustible heat source with at least one airflow channel - Google Patents

Abstract

a combustible heat source (4) having opposed front (6) and rear (8) faces; one or more airflow channels (18) extending from the front face (6) to the rear face (8) of the combustible heat source (4); an aerosol-forming substrate 10 downstream of the rear face 8 of the combustible heat source 4; a mouthpiece 14 downstream of the aerosol-forming substrate 10; 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). , 48). 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 is directed to the smoking article 2 , 34 , 38 , 42 , 44 , 48 via one or more airflow channels 18 and one or more air inlets 32 , 36 . At least a portion of the air that enters and is drawn through the aerosol-forming substrate 10 comes into direct contact with the combustible portion of the combustible heat source 4 .

Description

A smoking article comprising a combustible heat source having at least one airflow channel

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

A number of smoking articles have been proposed in the art in which tobacco is heated rather than combusted. One goal of these 'heated' smoking articles is to reduce known noxious smoke constituents of the type produced by the combustion and pyrolysis degradation of tobacco in conventional cigarettes. In one known type of heated smoking article, an aerosol is generated by heat transfer from a combustible heat source to an aerosol-forming substrate. The aerosol-forming substrate may be located in, 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. The released compound cools and condenses to form an aerosol that is inhaled by the user. Typically, air is drawn into these known heated smoking articles through one or more airflow channels provided through a combustible heat source, and heat transfer from the combustible heat source to the aerosol-forming substrate occurs by forced convection and conduction.

For example, WO-A2-2009/022232 discloses a combustible heat source, an aerosol-forming substrate downstream of the combustible heat source, and a heat conduction around and in direct contact with the rear portion of the combustible heat source and the adjacent front portion of the aerosol-forming substrate. A smoking article comprising urea is disclosed. In order to control the amount of forced convective heating in the aerosol-forming substrate, at least one longitudinal airflow channel is provided through the combustible heat source.

In known heated smoking articles in which the heat transfer from the combustible heat source to the aerosol-forming substrate is predominantly by forced convection, the forced convective heat transfer and thus the temperature of the aerosol-forming substrate will vary considerably depending on the puffing behavior of the user. can As a result, the composition and thus sensory properties of the mainstream aerosol generated by these known heated smoking articles may disadvantageously be very sensitive to the puffing regime of the user.

Further, in known heated smoking articles comprising one or more airflow channels along the combustible heat source, combustion of the combustible heat source is activated as a result of direct contact between the combustible heat source and air inhaled through the one or more airflow channels during puffing by the user. do. Thus, the intense puffing regime leads to sufficiently high forced convective heat transfer, resulting in a temperature spike of the aerosol-forming substrate that disadvantageously leads to thermal decomposition and potentially very localized burning of the aerosol-forming substrate. As used herein, the term 'spike' is used to describe a brief rise in the temperature of an aerosol-forming substrate. As a result, the level of undesirable thermal decomposition and combustion byproducts in the mainstream aerosol generated by these known heated smoking articles may also vary significantly and adversely depending on the particular puffing regime employed by the user.

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 apertures 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 comprises a thermally stable carbonaceous substrate 28 and the combustible fuel element 24 comprises a thermally conductive rod 26 and a foil scribing tube 14 ) 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 foil-lined tube 14 surrounding the void space 30 allows sufficient air to enter the void space. It includes a plurality of perimeter holes 32 to allow entry and provide adequate pressure drop. In this embodiment, the combustible fuel element 24 does not include any longitudinally extending bore 16 .

It is known to include additives in the combustible heat source of heated smoking articles to improve the ignition and combustion characteristics of the combustible heat source. However, the inclusion of ignition and combustion additives can lead to decomposition and reaction products, which are disadvantageous in the air drawn through one or more airflow channels provided along the combustible heat source of these known heated smoking articles during use. may enter

To facilitate aerosol formation, the aerosol-forming substrate of heated smoking articles typically contains a polyhydric alcohol, such as glycerin, or other known aerosol formers. During storage and smoking, these aerosol formers may migrate from the aerosol-forming substrate of known heated smoking articles to their combustible heat source. Migration of the aerosol former to the combustible heat source of known heated smoking articles can disadvantageously lead to degradation of the aerosol former, particularly during smoking of the heated smoking article.

There is a need for a heated smoking article comprising a combustible heat source having opposing front and rear faces and an aerosol-forming substrate downstream of the rear face of the combustible heat source that avoids temperature spikes of the aerosol-forming substrate under intense puffing regimes. In particular, a heated smoking article comprising a combustible heat source having opposing front and rear faces and an aerosol-forming substrate downstream of the rear face of the combustible heat source, wherein substantially no combustion or thermal decomposition of the aerosol-forming substrate occurs under intense puffing regimes. need.

According to the present invention, a combustible heat source having opposed front and rear faces; one or more airflow channels extending from the front face to the rear face 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 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 the one or more airflow channels and the one or more air inlets and at least a portion of the air drawn through the aerosol-forming substrate is transferred to and from the combustible portion of the combustible heat source. come into direct contact.

1A) shows an exploded view of a smoking article according to a first embodiment of the present invention;
1b) shows an exploded view of a smoking article according to a second embodiment of the present invention;
1C) shows an exploded view of a smoking article according to a fourth embodiment of the present invention;
1d) shows an exploded view of a smoking article according to a fifth embodiment of the present invention;
1e) shows an exploded view of a smoking article according to a seventh embodiment of the present invention;
1f) shows an exploded view of a smoking article according to an eighth embodiment of the present invention;
Fig. 2 shows a schematic longitudinal cross-sectional view of a smoking article according to a first embodiment of the invention shown in Fig. 1a); and
3 shows a schematic longitudinal cross-section of a smoking article according to a second embodiment of the invention shown in FIG. 1 b).

As used herein, 'aerosol-forming substrate' is used to describe a substrate capable of releasing volatile compounds upon heating, capable of forming an aerosol. The aerosols generated in the aerosol-forming substrate of smoking articles according to the present invention may be visible or invisible, and may be vapors (eg, particulates of substances that are in the gaseous state, usually liquid or solid at room temperature), as well as gases and It may contain droplets of condensed vapor.

The aerosol-forming substrate may be in the form of a plug or segment comprising a material capable of releasing volatile components when heated, capable of forming an aerosol, surrounded by a wrapper. Where the aerosol-forming substrate is in the form of a plug or segment, the entire plug or segment, including the wrapper, is considered to be the aerosol-forming substrate.

As used herein, the terms 'distal', 'upstream', and 'anterior', and 'proximal', 'downstream' and 'rear' refer to the direction in which a user draws on a smoking article during use of the smoking article. Used to describe the relative position of components or parts of components of an item. Smoking articles according to the present invention comprise a proximal end through which, in use, an aerosol exits the smoking article for delivery to a user. The proximal end of a smoking article may also be referred to as the mouth end. In use, a user draws at the proximal end of the smoking article to inhale an aerosol generated by the smoking article.

A combustible heat source is located at or proximate to the distal end. The mouthpiece is located at the proximal end. The mouth end is downstream of the distal end. The proximal end may be referred to as the downstream end of the smoking article and the distal end may be referred to as the upstream end of the smoking article. Components, or portions of components, of a smoking article may be described as upstream or downstream of one another based on their relative position between the proximal and distal ends of the smoking article.

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 largest dimension of a smoking article in the longitudinal direction. That is, the largest dimension in the longitudinal direction between the proximal end and the opposing distal end of the smoking article.

As used herein, the term 'airflow channel' is used to describe a channel extending along the length of a combustible heat source through which air may be drawn downstream during inhalation by a user.

As used herein, the term 'direct contact' means between the surface of the combustible portion of the combustible heat source and at least a portion of the air entering the smoking article through one or more airflow channels and one or more air inlets and being drawn through the aerosol-forming substrate. Used to describe contact.

Smoking articles according to the present invention include a non-blind combustible 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 enclosed airflow channels.

As used herein, the term 'enclosed' is used to describe an airflow channel that extends through the interior of the combustible heat source and is surrounded by the combustible heat source.

Alternatively or additionally, the one or more airflow channels may include one or more non-enclosed airflow channels. For example, the one or more airflow channels may include one or more grooves or other non-enclosed airflow channels extending along the exterior of the combustible heat source.

The one or more airflow channels may include one or more enclosed airflow channels or one or more unenclosed airflow channels or a combination thereof.

In certain embodiments, smoking articles according to the present invention include one, two or three airflow channels extending from the front face to the rear face of the combustible heat source.

In preferred embodiments, smoking articles according to the present invention comprise a single airflow channel extending from the front face to the rear face of the combustible heat source.

In particularly preferred embodiments, smoking articles according to the present invention comprise one substantially central or axial airflow channel extending from the front face to the rear face of the combustible heat source.

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

In addition to one or more airflow channels through which air may be drawn during inhalation by a user, a combustible heat source of a smoking article according to the present invention may comprise one or more closed or blocked passageways through which air cannot be drawn during inhalation by a user. You will have to understand that there is

For example, smoking articles according to the present invention may comprise one or more airflow channels extending from the front face to the rear face of the combustible heat source and one or more closed passages extending only partially along the length of the combustible heat source from the front face of the combustible heat source. It may also include a combustible heat source, including

Including one or more closed air passages increases the surface area the combustible heat source is exposed to oxygen from the air and may advantageously facilitate ignition and sustained combustion of the combustible heat source.

Smoking articles according to the present invention include 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, slit, slot or other perforation through which air may 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 at least one air inlet comprises no air inlet between the downstream end of the aerosol-forming substrate and the upstream end of the mouthpiece. In other words, smoking articles according to the present invention do not comprise any air inlets located downstream of the aerosol-forming substrate and upstream of the mouthpiece.

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

In use, air drawn through the aerosol-forming substrate of a smoking article enters the smoking article through one or more airflow channels and one or more air inlets. The drawn 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 comes into direct contact with the combustible portion of the combustible heat source.

Air drawn through an aerosol-forming substrate of a smoking article entering the smoking article through one or more airflow channels may come into direct contact with a combustible portion of the combustible heat source while passing through one or more airflow channels.

Alternatively or additionally, air drawn through the aerosol-forming substrate of the smoking article entering the smoking article through one or more airflow channels may come into direct contact with the rear face of the combustible heat source. In such embodiments, air drawn through the aerosol-forming substrate of the smoking article entering the smoking article through one or more air inlets may also come into 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.

During puffing by the user, the cooled air drawn through the one or more air inlets between the rear face of the combustible heat source and the aerosol-forming substrate advantageously reduces the temperature of the aerosol-forming substrate of a smoking article according to the present invention. This substantially prevents or inhibits a spike in the temperature of the aerosol-forming substrate of a smoking article according to the present invention during puffing by a user.

As used herein, the term 'cooling air' is used to describe ambient air that is not substantially heated by a combustible heat source when a user puffs.

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 substantially prevents or inhibits temperature spikes of the aerosol-forming substrate, thereby forming aerosols of smoking articles according to the present invention under intensive puffing regimes. It advantageously helps to avoid or reduce combustion or thermal decomposition of the substrate. Further, 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 minimizes or reduces the effect of the user's puffing regime on the composition of the mainstream aerosol of smoking articles according to the present invention. help to the advantage

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

During puffing by a user, the cooled air drawn through the one or more first inlets around the periphery of the aerosol-forming substrate advantageously reduces the temperature of the aerosol-forming substrate of a smoking article according to the present invention. This substantially prevents or inhibits a spike in the temperature of the aerosol-forming substrate of a smoking article according to the present invention during puffing by a user.

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

In certain embodiments, the aerosol-forming substrate may abut the rear face of the combustible heat source or a non-combustible substantially air impermeable first barrier provided on the rear face of the combustible heat source.

As used herein, the term 'contiguous' is used to describe the coming into direct contact of the aerosol-forming substrate with the rear surface of the combustible heat source or with a non-combustible substantially air-impermeable first barrier provided on the rear surface of the combustible heat source. do.

In other embodiments, the aerosol-forming substrate may be spaced apart from the rear face 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 face of the combustible heat source and the aerosol-forming substrate. In use, cooling 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 combustible heat source and the aerosol-forming substrate through the second air inlet passes downstream from the space between the combustible heat source and the aerosol-forming substrate through the smoking article and exits the smoking article through its proximal end. I'm going.

During puffing by a user, the cooled air drawn through the one or more second inlets between the rear face of the combustible heat source and the aerosol-forming substrate advantageously reduces the temperature of the aerosol-forming substrate of a smoking article according to the present invention. This substantially prevents or inhibits a spike in the temperature of the aerosol-forming substrate of a smoking article according to the present invention during puffing by a user.

Smoking articles according to the present invention may include at least one first air inlet around the periphery of the aerosol-forming substrate, or at least one second air inlet between the rear face of the combustible heat source and the aerosol-forming substrate, or around the periphery of the aerosol-forming substrate. It will be appreciated that a combination of one or more first inlets and one or more second air inlets between the rear face of the combustible heat source and the aerosol-forming substrate may be included.

Smoking articles according to the present invention comprise (i) a non-combustible substantially air impermeable first barrier between the rear face of the combustible heat source and the aerosol-forming substrate or (ii) a non-combustible substantially air impermeable first barrier between the combustible heat source and one or more airflow channels. It may further include one of the second barriers.

Smoking articles according to the present invention comprise (i) a non-combustible, substantially air-impermeable first barrier between the rear face of the combustible heat source and the aerosol-forming substrate and (ii) a non-combustible, substantially air-impermeable agent between the combustible heat source and one or more airflow channels. 2 It will be appreciated that it may not include both barriers.

As used herein, the term 'non-combustible' is used to describe a barrier that is substantially non-combustible at the temperatures reached by a combustible heat source during combustion and ignition.

When smoking articles according to the present invention further comprise (i) a non-combustible, substantially air impermeable first barrier between the rear face of the combustible heat source and the aerosol-forming substrate, to the smoking article via one or more airflow channels and one or more air inlets. Air drawn through the incoming aerosol-forming substrate is not in direct contact with the rear face of the combustible heat source. However, in such embodiments, air drawn through the aerosol-forming substrate entering the smoking article through one or more airflow channels is brought into direct contact with the combustible portion of the combustible heat source while passing through one or more airflow channels.

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

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

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

In certain preferred embodiments, the first barrier comprises a non-combustible, substantially air impermeable first barrier coating provided on the rear face of the combustible heat source. In these embodiments, the first barrier preferably comprises a first barrier coating provided on at least substantially the entire rear surface of the combustible heat source. More preferably, the first barrier comprises a first barrier coating layer provided on the entire rear surface of the combustible heat source.

In these embodiments, the first barrier allows air to be drawn through one or more airflow channels extending from the front face to the rear face of the combustible heat source.

As used herein, the term 'coating' is used to describe a layer of material covering and adhering to a combustible heat source.

The first barrier may advantageously limit the temperature to which the aerosol-forming substrate is exposed during ignition or combustion of a combustible heat source, and may thus help avoid or reduce thermal degradation or burning of the aerosol-forming substrate during use of the smoking article. there is. This is particularly advantageous when the combustible heat source contains one or more additives that assist in ignition of the combustible heat source.

The inclusion of a non-combustible, substantially air impermeable first barrier between the rear face of the combustible heat source and the aerosol-forming substrate also substantially prevents migration of components of the aerosol-forming substrate of a smoking article according to the present invention to the combustible heat source during storage of the smoking article. may advantageously be prevented or suppressed.

Alternatively or additionally, a non-combustible, substantially air impermeable first barrier between the rear face of the combustible heat source and the aerosol-forming substrate will allow a component of the aerosol-forming substrate of a smoking article according to the present invention to remain in contact with the combustible heat source during use of the smoking article. may be substantially advantageously prevented or inhibited.

Including a non-combustible, substantially air impermeable first barrier between the rear face of the combustible heat source and the aerosol-forming substrate may be particularly advantageous when the aerosol-forming substrate includes at least one aerosol former.

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

Depending on the desired characteristics and performance of the smoking article, the first barrier may have a low thermal conductivity or a high thermal conductivity. In certain embodiments, the first barrier has a bulk thermal conductivity of between about 0.1 W/(m.K) and about 200 W/(m.K) and 50% at 23° C. as measured using a modified transient plane source (MTPS) method. It may be formed of a material having a relative humidity of

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

The first barrier may be formed of one or more suitable materials that are substantially thermally stable and non-combustible at the temperatures achieved by the combustible heat source during ignition and combustion. Suitable materials are, but are not limited to, those known in the art and include clays (eg, bentonite and kaolinite, etc.), 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 may 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 to the rear face of the combustible heat source. In other preferred embodiments, the first barrier comprises a glass coating, more preferably a fired glass coating, provided on the rear face of the combustible heat source.

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

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

Due to the slight permeability of the clay to air, in embodiments where the first barrier comprises a clay coating provided on the rear face of the combustible heat source, the clay coating is more preferably at least about 50 μm, most preferably about 50 μm. and about 350 μm.

In embodiments in which the first barrier is formed of one or more materials that are more impermeable to air, such as aluminum, the first barrier may be thinner, preferably less than about 100 μm, more preferably less than about 20 μm. will have a thickness of

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

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.

When the first barrier comprises a first barrier coating layer provided on the rear face of the combustible heat source, the first barrier coating layer can be spray-coated, deposited, dipping, material transfer (e.g., brushed or pasted). ), electrostatic deposition, or any combination thereof, may be applied to cover and adhere to the rear face of the combustible heat source by any suitable method known in the art.

For example, the first barrier coating layer may be formed by previously forming a barrier to an approximate size and shape of the rear surface of the combustible heat source and applying it to the rear surface of the combustible heat source to cover and adhere to at least substantially the entire rear surface of the combustible heat source; may be done Alternatively, the first barrier coating may be applied to the rear face of the combustible heat source and then cut or otherwise machined. In one preferred embodiment, aluminum foil is applied to the rear face of the combustible heat source by pasting or pressing aluminum foil onto the combustible heat source, and cutting or otherwise machining such that the aluminum foil forms at least substantially the entire rear face of the combustible heat source, preferably. It covers and is attached to the entire rear face of the combustible heat source.

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 face of the combustible heat source. For example, the first barrier coating layer may be applied by dipping the rear face of the combustible heat source into a solution or suspension of one or more suitable coating materials, by brushing or spray-coating the solution or suspension, or by applying one or more suitable coating materials to the rear face of the combustible heat source. A powder or powder mixture of coating materials may be electrostatically deposited and applied to the rear face of the combustible heat source. When the first barrier coating layer is applied to the rear face of the combustible heat source by electrostatically depositing a powder or powder mixture of one or more suitable coating materials onto the rear face of the combustible heat source, the rear face of the combustible heat source is preferably pretreated with water prior to electrostatic deposition. do. Preferably, the first barrier coating layer is applied by spray coating.

The first barrier coating may be formed in one 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 formed by applying 1, 2, 3, 4, 5, 6, 7 or 8 successive applications of a solution or suspension of one or more suitable coating materials to the rear face of the combustible heat source.

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

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

When the first barrier coating is 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, the combustible heat source may need to be dried between successive applications of the solution or suspension.

Alternatively or additionally to drying, a solution or suspension of one or more coating materials may be applied to the rear face of the combustible heat source and then the coating material on the combustible heat source may be fired to form the first barrier coating. Firing of the first barrier coating layer is particularly preferred when the first barrier coating layer is a glass or ceramic coating layer. Preferably, the first barrier coating layer is fired at a temperature between about 500°C and about 900°C, and more preferably at about 700°C.

an aerosol-forming substrate entering the smoking article through one or more airflow channels, when smoking articles according to the present invention further comprise (ii) a non-combustible, substantially air impermeable second barrier between the combustible heat source and the one or more airflow channels; Air drawn through the air passes through the one or more airflow channels and does not come into direct contact with the combustible portion of the combustible heat source. However, in such embodiments, air drawn through the aerosol-forming substrate entering the smoking article through one or more airflow channels is brought into direct contact with the rear face of the combustible heat source. In such embodiments, air drawn through the aerosol-forming substrate entering the smoking article through one or more air inlets may also come into direct contact with the rear face of the combustible heat source.

The second barrier advantageously allows the drawn air to pass through the one or more airflow channels while the combustion and decomposition products formed during ignition and combustion of the combustible heat source of the smoking article according to the invention pass through the one or more airflow channels to the present invention. may substantially prevent or inhibit entry of air drawn into a smoking article according to the present invention. This is particularly advantageous when the combustible heat source contains one or more additives which assist in the ignition or combustion of the combustible heat source.

Inclusion of a non-combustible, substantially air-impermeable second barrier between the combustible heat source and the one or more airflow channels may also advantageously substantially prevent or inhibit activation of combustion of the combustible heat source of a smoking article according to the present invention during puffing by a user. there is. This may substantially prevent or inhibit a temperature spike of the aerosol-forming substrate during puffing by a user.

Combustion or thermal degradation of the aerosol-forming substrate of a smoking article according to the present invention may advantageously be avoided by preventing or inhibiting activation of combustion of the combustible heat source and thus preventing or inhibiting excessive temperature increase of the aerosol-forming substrate under intense puffing regimes. . Further, the effect of the user's puffing regime on the composition of the mainstream aerosol of smoking articles according to the present invention may advantageously be minimized or reduced.

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

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

Alternatively, the second barrier coating may be provided by inserting a liner into one or more airflow channels. For example, in the case of including one or more enclosed airflow channels extending through the interior of the combustible heat source, a non-combustible substantially air impermeable hollow tube 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 thermal conductivity or a high thermal conductivity. Preferably, the second barrier has a low thermal conductivity.

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

The second barrier may be formed of one or more suitable materials that are substantially thermally stable and non-combustible at the 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, clay; metal oxides such as iron oxide, alumina, titania, silica, silica-alumina, zirconia and ceria; zeolite; zirconium phosphate; and other ceramic materials or combinations thereof.

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

If the second barrier includes a second barrier coating provided on the inner surface of the one or more airflow channels, the second barrier coating may be applied to the one or more airflow channels by any suitable method, such as those described in US-A-5,040,551. It may be applied to the inner surface of the channel. 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 layer. In a preferred embodiment, the second barrier coating layer is applied to the inner surface of the one or more airflow channels by the process described in WO-A2-2009/074870 when the combustible heat source is extruded.

Preferably, smoking articles according to the present invention comprise an outer wrapper surrounding at least a rear portion of the aerosol-forming substrate and the combustible heat source. The outer wrapper must hold the combustible heat source and aerosol-forming substrate of the smoking article when assembling the smoking article.

More preferably, a smoking article according to the present invention surrounds 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 at least a rear portion of the combustible heat source. It contains an outer wrapper with

Preferably, the outer wrapper is substantially air impermeable.

Smoking articles according to the present invention may include an outer wrapper formed of any suitable material or combination of materials. Suitable materials are known in the art and include, but are not limited to, cigarette paper.

At least one air inlet between the rear face of the combustible heat source and the downstream end of the aerosol-forming substrate is an outer wrapper and any other enclosing components of a smoking article according to the present invention through which air may be drawn into one or more airflow paths. material is provided.

Where the one or more air inlets comprise one or more first air inlets around the periphery of the aerosol-forming substrate, the one or more first air inlets are provided in an outer wrapper and any other material surrounding the aerosol-forming substrate.

Where the one or more air inlets include one or more secondary air inlets between the rear face of the combustible heat source and the aerosol-forming substrate, the one or more secondary air inlets are provided in the outer wrapper and any 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 comprising carbon. Preferably, the combustible carbonaceous heat source for use in smoking articles according to the present invention comprises at least about 35 dry weight percent of the combustible heat source, more preferably at least about 40 dry weight percent, and most preferably about 45 dry weight percent. has a carbon content of

In some embodiments, a 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 composed primarily of carbon.

Combustible carbon-based heat sources for use in smoking articles according to the present invention have a carbon content of at least about 50%. For example, a combustible carbon-based heat source for use in smoking articles according to the present invention comprises at least about 60 dry weight, or at least about 70 dry weight, or at least about 80 dry weight carbon of the combustible carbon-based heat source. content may be present.

Smoking articles according to the present invention may include a combustible carbonaceous heat source formed from one or more suitable carbonaceous materials.

If desired, one or more binders may be combined with one or more carbon-containing materials. Preferably, the at least one binder is an organic binder. Suitable known organic binders include, but are not limited to, gums (eg guar gum), modified cellulose and cellulose derivatives (eg methyl cellulose, carboxymethyl cellulose, hydroxypropyl cellulose and hydroxypropyl methylcellulose). ) flour, starch, sugar, vegetable oil and combinations thereof.

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

Instead of, or in addition to, one or more binders, a combustible heat source for use in smoking articles according to the present invention may include one or more additives to enhance the properties of the combustible heat source. Suitable additives include additives that promote consolidation of the combustible heat source (eg, sintering aids), additives that promote ignition of the combustible heat source (eg, perchlorates, chlorates, nitrates, peroxides, permanganates, zirconium and oxidizing agents, such as combinations thereof), additives that promote combustion of the combustible heat source (e.g., potassium and potassium salts, such as potassium citrate), and additives that promote the decomposition of one or more gases produced by combustion of the combustible heat source (eg, potassium citrate). catalysts such as, for example, CuO, Fe ₂ O ₃ and Al ₂ O ₃ ).

When smoking articles according to the present invention comprise a first barrier coating layer provided on the rear face of the combustible heat source, such additives are incorporated into the combustible heat source either before or after application of the first barrier coating layer to the rear face of the combustible heat source. It could be.

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' is used to denote a substance that releases one or both of energy and oxygen during ignition of a combustible heat source, wherein one or both of energy and oxygen by the substance The rate of release of both is not limited by ambient oxygen diffusion. That is, the rate of release of either or both energy and oxygen by a material during ignition of a combustible heat source is largely independent of the rate at which ambient oxygen can reach the material. As used herein, the term 'ignition aid' is also used to denote an elemental metal that releases energy during ignition of a combustible carbonaceous heat source, wherein the ignition temperature of the elemental metal is less than about 500°C; The heat of combustion of elemental metals is at least about 5 kJ/g.

As used herein, the term 'fire aid' refers to alkali metal salts (alkali metal citrate salts, alkali metal acetate salts and alkali metal acetate salts) of carboxylic acids, which are believed to modify carbon combustion. metal succinate salt, etc.), alkali metal halide salt (alkali metal chloride salt, etc.), alkali metal carbonate salt or alkali metal phosphate ( It does not contain alkali metal phosphate salt). Even when present in large amounts relative to the total amount of the combustible heat source, these alkali metal burn salts do not release sufficient energy during ignition of the combustible carbonaceous heat source to produce an acceptable aerosol during the initial puff.

Examples of suitable oxidizing agents include, but are not limited to, nitrates such as, for example, potassium nitrate, calcium nitrate, strontium nitrate, sodium nitrate, barium nitrate, lithium nitrate, aluminum nitrate and iron nitrate; nitrite; other organic and inorganic nitro compounds; chlorates such as, for example, sodium chlorate and potassium chlorate; perchlorates such as, for example, sodium perchlorate; chlorite; bromate salts such as, for example, sodium bromate and potassium bromate; perbromate; bromite; borates such as, for example, sodium borate and potassium borate; ferrates such as, for example, barium ferrate; ferrite; manganates such as, for example, potassium manganate; permanganates such as, for example, potassium permanganate; organic peroxides such as, for example, benzoyl peroxide and acetone peroxide; inorganic peroxides such as, for example, hydrogen peroxide, strontium peroxide, magnesium peroxide, calcium peroxide, barium peroxide, zinc peroxide and lithium peroxide; superoxides such as, for example, potassium acetate and sodium acetate; iodate; Periodoxate; iodite; sulfate; sulfite; other sulfoxides; phosphate; phospinate; phosphite; and phosphanite.

Advantageously improves the ignition and combustion performance of the combustible heat source, but may include ignition and combustion additives to create undesirable decomposition and reaction products during smoking article use. For example, nitrogen oxides may be formed as a result of the decomposition of nitrates contained in combustible heat sources to assist ignition.

The inclusion of a non-combustible, substantially air-impermeable second barrier between the combustible heat source and the at least one airflow channel of smoking articles according to the present invention advantageously allows drawn air to pass through the at least one airflow channel while such decomposition and reaction products are absorbed into the at least one Airflow channels may substantially prevent or inhibit entry of drawn air into smoking articles according to the present invention through the airflow channels.

Combustible carbonaceous heat sources for use in smoking articles according to the present invention may be prepared as described in the prior art known to those skilled in the art.

A combustible carbonaceous heat source for use in smoking articles according to the present invention preferably comprises mixing one or more carbonaceous materials with one or more binders and other additives, if included, and preforming the mixture into the desired shape. is formed by The mixture of one or more carbon-containing materials, one or more binders, and optional other additives may be formed using any suitable known ceramic forming methods, such as, for example, slip casting, extrusion, injection molding, and mold pressing or pressing. It may be formed in advance into a desired shape. In certain preferred embodiments, the mixture is pre-formed into a desired shape by pressing or extruding or a combination thereof.

Preferably, the mixture of one or more carbon-containing materials, one or more binders and other additives is pre-formed into an elongate 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-formed into other desired shapes.

After formation, in particular after extrusion, preferably the elongated rod or other desired shape is dried to reduce its moisture content and then carbonizes the one or more binders present and substantially removes volatiles from the elongated rod or other desired shape. thermally decomposes in a non-oxidizing atmosphere at a temperature sufficient to 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, at least one metal nitrate salt is incorporated into the combustible heat source by including the at least one metal nitrate precursor in a mixture of one or more carbon-containing materials, one or more binders, and other additives. The pyrolyzed preformed cylindrical rod or other shape is then treated with an aqueous solution of nitric acid so that the at least one metal nitrate precursor is subsequently converted in-situ to at least one metal nitrate salt. In one embodiment, the combustible heat source comprises at least one metal nitrate salt having a thermal decomposition temperature of less than about 600°C, more preferably less than 400°C. Preferably, the at least one metal nitrate salt has a decomposition temperature between about 150°C and about 600°C, more preferably between about 200°C and about 400°C.

In preferred embodiments, when the combustible heat source is exposed to a conventional yellow flame lighter or other means of ignition, at least one metal nitrate salt should cause the decomposition and release of oxygen and energy. This decomposition causes an initial rise in the temperature of the combustible heat source and also aids in ignition of the combustible heat source. After decomposition of the at least one metal nitrate salt, the combustible heat source preferably continues to burn at a lower temperature.

The inclusion of at least one metal nitrate salt advantageously causes ignition of the combustible heat source to be initiated internally and also at a point on its surface. Preferably, the at least one metal nitrate salt is present in the combustible heat source in an amount of between about 20% and about 50% by dry weight of the combustible heat source.

In another embodiment, the combustible heat source includes at least one peroxide or superoxide that actively evolves oxygen at a temperature of less than about 600°C, more preferably less than 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 between about 200°C and about 400°C, and most preferably at a temperature of about 350°C. actively generate.

In use, exposure of the combustible heat source to a conventional yellow flame lighter or other means of ignition should cause at least one peroxide or superoxide to decompose and release oxygen. This causes an initial rise in the temperature of the combustible heat source and also aids in ignition of the combustible heat source. Following decomposition of the at least one peroxide or superoxide, the combustible heat source preferably continues to burn at a lower temperature.

The inclusion of at least one peroxide or superoxide causes ignition of the combustible heat source to be initiated internally and also at a point on its surface.

The combustible heat source preferably has a porosity between about 20% and about 80%, more preferably between about 20% and 60%. When the combustible heat source includes at least one metal nitrate salt, this allows oxygen to diffuse to the majority of the combustible heat source at a rate sufficient to sustain combustion as the at least one metal nitrate salt decomposes and combustion proceeds. Even more preferably, the combustible heat source is between about 50% and about 70%, more preferably between about 50% and about 50% as measured, for example, by mercury porosimetry or helium pycnometry. It has a porosity between about 60%. The required porosity may be readily achieved during production of the combustible heat source using conventional methods and techniques.

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

Preferably, the combustible heat source has a mass between about 300 mg and about 500 mg, more preferably between about 400 mg and about 450 mg.

Preferably, the combustible heat source has a length between about 7 mm and about 17 mm, more preferably between about 7 mm and about 15 mm, and most preferably between about 7 mm and about 13 mm.

Preferably, the combustible heat source has a diameter between about 5 mm and about 9 mm, more preferably between about 7 mm and about 8 mm.

Preferably, the combustible heat source has a substantially uniform diameter. However, the combustible heat source may alternatively be tapered such that the rear portion of the combustible heat source has a larger diameter than its front portion. It is particularly preferred that the combustible heat source is substantially cylindrical. The combustible heat source may be, for example, a cylinder or tapered cylinder of substantially circular cross-section or a cylinder or tapered cylinder of substantially elliptical cross-section.

Preferably, smoking articles according to the present invention comprise an aerosol-forming substrate comprising at least one aerosol-forming agent and a material capable of releasing volatile compounds in response to heating. The aerosol-forming substrate may also contain other additives and ingredients including, but not limited to, humectants, flavorants, binders, and mixtures thereof.

Preferably, the aerosol-forming substrate contains nicotine. Preferably, the aerosol-forming substrate comprises tobacco.

The at least one aerosol former may be any suitable known compound or mixture of compounds that facilitates the formation of a dense and stable aerosol in use and substantially resists thermal degradation at the operating temperature of the smoking article. Suitable aerosol formers are well known in the art and include, for example, polyhydric alcohols, esters of polyhydric alcohols such as glycerol mono-, di- or triacetate, and dimethyl dodecanedioate and dimethyl tetradecanedioate. fatty esters of mono-, di- or polycarboxylic acids such as tetradecanedioate. Preferred aerosol formers for use in smoking articles according to the present invention are triethylene glycol, polyhydric alcohols such as 1,3-butanediol or mixtures thereof, most preferably glycerin.

A material capable of releasing volatile compounds in response to heating may be a filler of plant-based material. A material capable of releasing volatile compounds in response to heating may be a charge of homogenized plant-based material. For example, aerosol-forming substrates include, but are not limited to, tobacco; tea, such as green tea; peppermint; laurel; eucalyptus; basil; sage; verbena; and one or more substances derived from plants including tarragon.

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

The aerosol-forming substrate may also be in the form of a plug or segment comprising a material capable of releasing volatile compounds in response to heating, surrounded by a paper or other wrapper. As noted above, where the aerosol-forming substrate is in the form of a plug or segment, the entire plug or segment, including any wrapper, is considered to be the 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 preferred embodiments, the aerosol-forming substrate comprises a plug of tobacco-based material enclosed in a plug wrap. In particularly preferred embodiments, the aerosol-forming substrate comprises a plug of homogenized tobacco-based material wrapped in a plug wrap.

Preferably, smoking articles according to the present invention further comprise heat-conducting elements around the rear portion of the combustible heat source and at least the front portion of the aerosol-forming substrate. The heat conducting element is preferably flame retardant. In certain implementations, the heat conducting element is oxygen limiting. In other words, the heat conducting element inhibits or resists the passage of oxygen through the heat conducting element to the combustible heat source.

In certain embodiments, the heat conducting 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-conducting element provides a thermal connection between the combustible heat source of smoking articles according to the present invention and the aerosol-forming substrate.

In other embodiments, the heat-conducting element is spaced from one or both of the rear portion of the combustible heat source and the aerosol-forming substrate, such that there is a gap between the heat-conducting element and one or both of the rear portion of the combustible heat source and the aerosol-forming substrate. may not have direct contact with

Suitable heat-conducting elements for use in smoking articles according to the present invention include, but are not limited to, metal foil wrappers such as, for example, aluminum foil wrappers, steel wrappers, iron foil wrappers and copper foil wrappers; and a metal alloy foil wrapper.

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

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 length.

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

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

In embodiments in which the heat-conducting element surrounds only the front portion of the aerosol-forming substrate, the aerosol-forming substrate preferably extends downstream at least about 3 mm beyond the heat-conducting element. That is, the aerosol-forming substrate extends downstream beyond the heat conducting element between about 3 mm and about 10 mm. In other embodiments, the aerosol-forming substrate extends less than 3 mm downstream beyond the heat-conducting element.

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

Smoking articles according to the invention comprise 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 piece or component mouthpiece. Alternatively, the mouthpiece may be a multi-site or multi-component mouthpiece.

The mouthpiece may include a filter comprising one or more segments comprising suitable known filtering materials. Suitable filtration materials are known in the art and include, but are not limited to, acetic acid acetate and paper. Alternatively or additionally, the mouthpiece may include one or more portions including absorbents, adsorbents, flavoring agents, and other aerosol modifiers and additives or combinations thereof.

Smoking articles according to the invention preferably further comprise a transfer element or spacer element between the aerosol-forming substrate and the mouthpiece.

The conveying element may abut one or both of the aerosol-forming substrate and the mouthpiece. Alternatively, the transport element may be spaced apart from one or both of the aerosol-forming substrate and the mouthpiece.

The inclusion of a transfer element advantageously enables cooling of the aerosol generated by heat transfer from the combustible heat source to the aerosol-forming substrate. The inclusion of a conveying element also advantageously allows the overall length of the smoking article according to the invention to be adjusted to a desired value, eg to a length similar to that of conventional cigarettes, through appropriate selection of the length of the conveying element.

The conveying 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 conveying 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 conveying element comprises a tubular hollow body open at at least one end. In such embodiments, in use, air drawn into the smoking article through the one or more air inlets is passed through the at least one open-ended tubular hollow body as it passes through the smoking article downstream from the aerosol-forming substrate to the mouthpiece.

The transfer element may comprise at least one open-ended tubular hollow body formed of 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. Suitable materials are known in the art and include, but are not limited to, paper, cardboard, plastics such as cellulose acetate, ceramics, and combinations thereof.

Alternatively or additionally, smoking articles according to the present invention may comprise 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 corrugated sheet of 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 is polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polyethylene terephthalate (PET), polylactic acid (PLA), cellulose acetate (CA), and aluminum. It may also include a corrugated sheet of material selected from the group consisting of foils.

In certain preferred embodiments, the aerosol cooling element may comprise a pleated sheet of biodegradable polymeric material, such as polylactic acid (PLA) or Mater-Bi® grades (a family of commercially available starch-based copolyesters).

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

Suitable aerosol modifiers include, but are not limited to, flavoring agents; Contains chemesthetic agents.

As used herein, the term 'flavourant' describes any substance that, when used, imparts one or both a taste or aroma to an aerosol generated by an aerosol-forming substrate of a smoking article. used to

As used herein, the term 'chemesthetic agent', when used, is a substance that is perceived by means other than perception through taste receptor cells or olfactory receptor cells, or in addition to that, by the user's oral or olfactory senses. Used to describe any substance. Perception of an object sensory agent is usually through a "trigeminal response", or through the trigeminal nerve, glossopharyngeal nerve, vagus nerve, or some combination thereof. . Ordinarily, an object sensory agent is perceived as a hot, spicy, cold, or soothing sensation.

Smoking articles according to the present invention may also include one or more aerosol modifiers downstream of the aerosol-forming substrate, which are both flavoring agents and sensory agents. For example, one or more of the mouthpiece, delivery element and aerosol-cooling element of smoking articles according to the present invention may include menthol or other flavoring agents that provide a cooling object sensory effect.

Smoking articles according to the present invention may be assembled using known methods and machinery.

The invention will be further described for illustrative purposes only with reference to the accompanying drawings.

A smoking article 2 according to a first embodiment of the invention shown in FIGS. 1 a) and 2 comprises a combustible heat source 4 having a front face 6 and an opposed rear face 8, an aerosol-forming substrate 10 ), the conveying element 12 and the mouthpiece 14 are abutted in coaxial alignment. As shown in Fig. 2, the aerosol-forming substrate 10, transport element 12 and the rear portion of the mouthpiece 14 and the combustible heat source 4 are made of a sheet, such as cigarette paper, for example with low air permeability. It is wrapped in an outer wrapper 16 of material.

The combustible heat source 4 comprises a central airflow channel 18 (shown in dotted lines in FIG. 1A ) extending from the front face 6 to the rear face 8 of the combustible heat source 4 .

An aerosol-forming substrate 10 is located immediately downstream of the rear face 8 of the combustible heat source 4 . The aerosol-forming substrate 10 comprises a cylindrical plug of homogenized tobacco-based material 20 containing an aerosol former such as eg glycerin, which is wrapped in a plug wrap 22 .

The conveying element 12 is located immediately downstream of the aerosol-forming substrate 10 and comprises an open-ended cylindrical hollow tube 24 of any suitable material, for example paper, cardboard or cellulose acetate tow.

Mouthpiece 14 is located just downstream of transport element 12 at the proximal end of smoking article 2 . Mouthpiece 14 comprises a cylindrical plug of suitable filtration material 26 of very low filtration efficiency, for example cellulose acetate tow, wrapped in a filter plug wrap 28.

The smoking article may further comprise a band of tipping paper (not shown) surrounding the downstream end of the outer wrapper 16 .

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

A smoking article 2 according to the first embodiment of the present invention comprises 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 one or more first inlets located around the periphery of the aerosol-forming substrate 10 ( 32) are included.

As shown in FIG. 2 , a circumferential arrangement of first air inlets 32 is provided to the plug wrap 22 and overlying outer wrapper 16 of the aerosol-forming substrate 10 to provide cooling air ( FIG. 1A ). and shown by dashed arrows in FIG. 2 ) into the aerosol-forming substrate 10 . In other embodiments (not shown) of the present invention in which the heat-conducting element 30 is around and in contact with the entire length of the aerosol-forming substrate 10, the circumferential arrangement of the first air inlet 32 It should be appreciated that this plug wrap 22 of the aerosol-forming substrate 10, the overlaying heat conducting element 30 and the overlaying outer wrapper 16 are provided to allow cooling air to enter the aerosol-forming substrate 10. will be.

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 draws on the mouthpiece 14 . When the user draws on the mouthpiece 14, air (shown by the dotted arrows in FIGS. 1A and 2) is drawn into the smoking article 2 through the central airflow channel 18 of the combustible heat source 4 and , heated while passing through the central airflow channel 18 of the combustible heat source 4. When the user inhales on the mouthpiece 14, cooling air (shown by the dotted arrows in FIGS. 1A and 2) also passes through the first air inlet 32 to the aerosol-forming substrate 10 of the smoking article 2. ) is aspirated into

Heated air drawn in through the central airflow channel 18 of the combustible heat source 4 passes downstream through the aerosol-forming substrate 10 towards the mouthpiece 14 of the smoking article 2 while forced convection to form an aerosol. The forming substrate 10 is heated. The front portion 10a of the aerosol-forming substrate 10 is also heated by conduction through the abutting rear face 8 of the combustible heat source 4 and the heat conducting element 28 .

Heating of 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-based material 20 . Compounds released from the aerosol-forming substrate 10 are smoked through the first air inlet 32 while flowing through the aerosol-forming substrate 10 and air drawn through the central airflow channel 18 of the combustible heat source 4 It forms an aerosol that is entrained in the air drawn into the aerosol-forming substrate 10 of the article 2 . Aspired air and entrained aerosols (shown by dotted arrows in FIGS. 1A and 2 ) pass downstream through conveying element 12 where they are cooled and condensed. The cooled drawn air and entrained aerosol pass downstream through the mouthpiece 14 and are delivered to the user through the proximal end of the smoking article 2 according to the first embodiment of the present invention.

A smoking article 34 according to the second embodiment of the present invention shown in FIGS. 1 b) and 3 has a construction substantially identical to the smoking article according to the first embodiment of the present invention shown in FIGS. 1 a) and 2 have 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 spaced apart from each other, and the rear face 8 of the combustible heat source 4 and the aerosol One or more air inlets located between the downstream end of the forming substrate 10 include one or more second 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 , a circumferential arrangement of secondary air inlets 36 forms a heat conducting element 30 between the rear face 8 of the combustible heat source 4 and the upstream end of the aerosol-forming substrate 10. and an overlaying outer wrapper 16 to allow cooling air (shown by dotted arrows in FIG. 1B and FIG. 3 ) into the space between the combustible heat source 4 and the aerosol-forming substrate 10 .

In use, when a user draws on the mouthpiece 14 of a smoking article 34 according to the second embodiment of the present invention, air (shown by dotted arrows in FIG. 1B ) and FIG. Cooled air is also drawn into the space between the combustible heat source 4 and the aerosol-forming substrate 10 through the secondary air inlet 36.

The heated air drawn through the central airflow channel 18 of the combustible heat source 4 passes downstream through the aerosol-forming substrate 10 towards the mouthpiece 14 of the smoking article 34 while forming an aerosol by convection. The substrate 10 is heated. The front portion 10a of the aerosol-forming substrate 10 is also heated by conduction via the heat conducting element 28 .

Heating of the aerosol-forming substrate 10 by conduction and convection releases glycerine and other volatile and semi-volatile compounds from the plug of homogenized tobacco-based material 20 . The compound released from the aerosol-forming substrate 10 flows through the aerosol-forming substrate 10 and the air drawn through the central airflow channel 18 of the combustible heat source 4 while passing through the second air inlet 36 to the combustible heat source (4) to form an aerosol entrained in the air sucked into the space between the aerosol-forming substrate 10. The aspired air and the entrained air (shown by dashed arrows in FIG. 1 b and FIG. 3 ) pass downstream through the conveying element 12 where they are cooled and condensed. The cooled drawn air and entrained air pass downstream through the mouthpiece 14 and are delivered to the user through the proximal end of the smoking article 34 according to the second embodiment of the present invention.

A smoking article according to the third embodiment of the present invention (not shown) has a construction largely identical to the smoking article according to the second embodiment of the present invention shown in FIGS. 1 b ) and 3 . However, in a smoking article according to a third embodiment of the invention, the at least one air inlet located between the rear face of the combustible heat source and the downstream end of the aerosol-forming substrate is the second embodiment of the invention shown in FIGS. 1 b) and 3 at least one second inlet located between the rear face of the combustible heat source 4 and the aerosol-forming substrate 10 as in the smoking article according to the example and in the first embodiment of the invention shown in FIGS. 1 a) and 2 and one or more first inlets located around the periphery of the aerosol-forming substrate, such as in smoking articles according to the present invention.

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

Combustible carbonaceous heat sources for use in smoking articles according to the first, second and third embodiments of the present invention may be produced according to Example 1 by omitting the second barrier coating layer of clay.

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 airflow channel of the combustible heat source, passes through the central airflow channel to reduce the combustible heat source's combustible come into direct contact with the part. Air drawn through the aerosol-forming substrate of smoking articles according to the first, second and third embodiments of the invention entering the smoking article through the central airflow channel also comes into direct contact with the rear face of the combustible heat source.

The smoking article 38 according to the fourth embodiment of the invention shown in FIG. 1c) has substantially the same construction 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, a non-combustible, substantially air impermeable first barrier 40 is provided between the rear face 8 of the combustible heat source 4 and the aerosol-forming substrate 10. is provided on 1c), the first barrier 40 comprises a non-combustible, substantially air impermeable first barrier coating layer provided on the entire rear surface 8 of the combustible heat source 4, and the combustible heat source 4 A central airflow channel 18 of the first barrier coating extends through.

As a result of including the first barrier coating layer, the aerosol-forming substrate 10 of the smoking article 38 according to the fourth embodiment of the present invention does not directly contact the rear face 8 of the combustible carbonaceous heat source 4 .

As a result of including the first barrier coating layer, when in use, the air drawn through the smoking article 38 according to the fourth embodiment of the present invention through the central airflow channel 18 of the combustible heat source 4 also causes a combustible carbonaceous heat source ( 4) is not in direct contact with the rear surface (8). Also, as a result of including the first barrier coating layer, in use, the cooled 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 There is no direct contact with the rear face (8) of the combustible carbonaceous heat source (4).

However, the air drawn through the aerosol-forming substrate 10 of the smoking article 38 according to the fourth embodiment of the present invention entering the smoking article 38 through the central airflow channel 18 of the combustible heat source 4 passes through the central airflow channel 18 and comes into direct contact with the combustible part of the combustible heat source.

The smoking article 42 according to the fifth embodiment of the invention shown in FIG. 1 d) has substantially the same construction as the smoking article according to the second embodiment of the invention shown in FIGS. 1 b) and 3 . However, in the smoking article 42 according to the fifth embodiment of the present invention, a non-combustible, substantially air impermeable first barrier 40 is provided between the rear face 8 of the combustible heat source 4 and the aerosol-forming substrate 10. is provided on 1d), the first barrier 40 comprises a non-combustible, substantially air impermeable first barrier coating layer provided on the entire rear face 8 of the combustible heat source 4, and the combustible heat source 4 A central airflow channel 18 of the first barrier coating extends through.

As a result of including the first barrier coating layer, when in use, air drawn into a smoking article 42 according to the fifth embodiment of the present invention through the central airflow channel 18 of the combustible heat source 4 ) is not in direct contact with the rear face 8 of the In addition, as a result of including the first barrier coating layer, when in use, the combustible heat source 4 and the aerosol-forming substrate 10 of the smoking article 42 according to the fifth embodiment of the present invention via the second air inlet 36 Cooling air drawn into the space between them does not directly contact the rear face 8 of the combustible carbonaceous heat source 4 .

However, the air drawn 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 airflow channel 18 of the combustible heat source 4 passes through the central airflow channel 18 and comes into direct contact with the combustible part of the combustible heat source.

A smoking article according to the sixth embodiment (not shown) of the present invention has substantially the same construction as the smoking article according to the third embodiment (not shown) of the present invention. However, in smoking articles according to the sixth embodiment of the present invention, a non-combustible, substantially air impermeable first barrier is provided between the rear face of the combustible heat source and the aerosol-forming substrate. The first barrier includes a non-combustible, substantially air impermeable first barrier coating provided on the entire rear face of the combustible heat source, and a central airflow channel of the combustible heat source extends through the first barrier coating.

As a result of including the first barrier coating layer, when in use, air drawn into a smoking article according to the sixth embodiment of the present invention through the central airflow channel of the combustible heat source does not directly contact the rear face of the combustible carbonaceous heat source. Further, as a result of including the first barrier coating layer, when in use, inside the space 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 and through the first air inlet of the present invention The cooling air drawn into the aerosol-forming substrate of the smoking article according to the sixth embodiment of the smoking article does not directly contact the rear face of the combustible carbonaceous heat source.

However, air drawn through the aerosol-forming substrate of a smoking article according to the sixth embodiment of the present invention, entering the smoking article through the central airflow channel of the combustible heat source, directly contacts the combustible portion of the combustible heat source while passing through the central airflow channel. will do

Combustible carbonaceous heat sources for use in smoking articles according to embodiments 4, 5 and 6 of the present invention may be provided according to Examples 2, 3 and 4.

The smoking article 44 according to the seventh embodiment of the invention shown in FIG. 1e) has substantially the same construction as the smoking article according to the second 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, a non-combustible, substantially air-impermeable second barrier 46 (shown in dotted lines in FIG. 1E ) is provided between the combustible heat source 4 and the central airflow channel (18) is provided between. The second barrier 46 includes a non-combustible, substantially air impermeable second barrier coating provided on the entire inner surface of the central airflow channel 18 .

As a result of including the second barrier coating layer, when in use, air drawn through the central airflow channel 18 of the combustible heat source 4 and into the smoking article 38 according to the seventh embodiment of the present invention passes through the central airflow channel 18 While passing through, it does not directly contact the combustible part of the combustible carbonaceous heat source (4).

However, the air drawn through the aerosol-forming substrate 10 of the smoking article 44 according to the seventh embodiment of the present invention entering the smoking article 44 through the central airflow channel 18 of the combustible heat source 4 comes into direct contact with the rear face (8) of the combustible heat source (4).

The smoking article 48 according to the eighth embodiment of the invention shown in FIG. 1f) has substantially the same construction as the smoking article according to the second embodiment of the invention shown in FIGS. 1b) and 3 . However, in smoking article 48 according to the eighth embodiment of the present invention, a non-combustible, substantially air-impermeable second barrier 46 (shown in dotted lines in FIG. (18) is provided between. The second barrier 46 includes a non-combustible, substantially air impermeable second barrier coating provided on the entire inner surface of the central airflow channel 18 .

As a result of including the second barrier coating layer, when in use, air drawn through the central airflow channel 18 of the combustible heat source 4 and into the smoking article 48 according to the eighth embodiment of the present invention passes through the central airflow channel 18 While passing through, it does not directly contact the combustible carbonaceous heat source (4).

However, the air drawn through the aerosol-forming substrate 10 of the smoking article 48 according to the eighth embodiment of the present invention entering the smoking article 48 through the central airflow channel 18 of the combustible heat source 4 comes into direct contact with the rear face (8) of the combustible heat source (4). In addition, the cooling air drawn 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 through the second air inlet 36 is the combustible heat source There is no direct contact with the rear surface 8 of (4).

A smoking article according to the ninth embodiment (not shown) of the present invention has substantially the same construction as the smoking article according to the third embodiment (not shown) of the present invention. However, in smoking articles according to the ninth embodiment of the present invention, a non-combustible, substantially air impermeable second barrier is provided between the combustible heat source and the central airflow channel. The second barrier comprises a non-combustible, substantially air impermeable second barrier coating provided on the entire inner surface of the central airflow channel.

As a result of including the second barrier coating layer, when in use, air drawn into a smoking article according to the ninth embodiment of the present invention through the central airflow channel of the combustible heat source does not directly contact the combustible carbonaceous heat source while passing through the central airflow channel. .

However, air drawn through the aerosol-forming substrate of a smoking article according to the ninth embodiment of the present invention, entering the smoking article through the central airflow channel of the combustible heat source, comes into direct contact with the rear face of the combustible heat source. Further, the cooling air drawn 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 through the second air inlet is brought into direct contact with the rear surface of the combustible heat source.

Combustible carbonaceous heat sources for use in smoking articles according to seventh, eighth and ninth embodiments of the present invention may be provided in accordance with Example 1.

Example 1 - Preparation of a Combustible Carbonaceous Heat Source Comprising a Second Barrier Coating Layer of Clay

Combustible cylindrical carbonaceous heat sources for use in smoking articles according to the present invention may be prepared as described in WO-A2-2009/074870 A2 or any other prior art known to those skilled in the art. As described in WO-A2-2009/074870 A2, the water-soluble slurry is extruded through a die with a central die orifice of circular cross-section to produce a combustible heat source. The die orifice has a diameter of 8.7 mm to form a cylindrical rod having a length between about 20 cm and about 22 cm and a diameter between about 9.1 mm and about 9.2 mm. A single longitudinal airflow channel is formed within the cylindrical rod by a mandrel centrally installed in the die orifice. 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 the cylindrical rod using three mandrels of circular cross section with an outer diameter of approximately 2 mm installed at regular angles in the die orifice. During extrusion of the cylindrical rod, a slurry of a clay-based coating layer (formed using a clay such as natural green clay) is pumped through a mandrel or a feed path extending through the center of the mandrels to form an airflow channel or channels onto the inner surface of the channels. A thin second barrier coating layer of about 150 μm to about 300 μm is formed. 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 pyrolyzed in a nitrogen atmosphere at about 750° C. for about 240 minutes. After pyrolysis, cylindrical rods are cut to defined diameters using a grinding machine and shaped to form individual combustible carbonaceous heat sources. The rod after cutting and forming has a length of about 11 mm, a diameter of about 7.8 mm and a dry weight of about 400 mg. The individual combustible carbonaceous heat sources are then dried at about 13° C. for approximately 1 hour.

Example 2 - Preparation of a Combustible Carbonaceous Heat Source Comprising a First Barrier Coating Layer of Bentonite/Kaolinite

An incombustible, substantially air impermeable first barrier coating layer of bentonite/kaolinite is provided on the rear face of a combustible carbonaceous heat source prepared as described in Example 1, but there is no second barrier coating layer of clay. The first barrier coating layer is applied by dipping, brushing or spray coating. Immersion involves inserting the rear face of a combustible carbonaceous heat source into a concentrated bentonite/kaolinite solution. The bentonite/kaolinite solution for soaking contained 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, allowing the meniscus to disappear as a result of penetration of the solution into the carbon pores at the surface of the rear face of the combustible carbonaceous heat source. . Brushing involves dipping the brush into a concentrated bentonite/kaolinite solution and applying the concentrated bentonite/kaolinite on the brush to the surface of the rear face of the combustible carbonaceous heat source until it is coated. The bentonite/kaolinite solution for brushing contained 3.8% bentonite, 12.5% kaolinite and 83.7% H ₂ O [m/m].

After application of the non-combustible, substantially air-impermeable first barrier coating layer by dipping or brushing, the combustible carbonaceous heat source is dried in an oven at about 130° C. for about 30 minutes and then dried in desiccators overnight at about 5% relative humidity. ) is placed within

The spray coating preferably contains 3.6% bentonite, 18.0% kaolinite and 78.4% H ₂ O [m/m] and has a value of about 100 s-1 as measured by a rheometer (Physica MCR 300, coaxial cylinder arrangement). It contains a suspension having a viscosity of the order of 50 mPa·s at a shear rate. Spray coating was applied with a Sata MiniJet 3000 spray gun using a 0.5 mm, 0.8 mm or 1 mm spray nozzle on an SMC E-MY2B linear actuator at a speed of about 10 mm/s to about 100 mm/s. The following firing parameters: sample-pistol distance 15 cm; sample rate 10 mm/s; spray nozzle 0.5mm; A spray jet flat and a spray pressure of 2.5 bar are used. For a single spray coating, coating thicknesses of about 11 μm are typically obtained. Repeat spraying 3 times. Between each spray coating, the combustible carbonaceous heat source is allowed to dry at room temperature for about 10 minutes. After application of the non-combustible, substantially air-impermeable first barrier coating, the combustible carbonaceous heat source is pyrolyzed at about 700°C for approximately 1 hour.

Example 3 - Preparation of a combustible carbonaceous heat source comprising a first barrier coating layer of glass

A non-combustible, substantially air-impermeable first barrier coating layer of glass is provided on the rear face of a combustible carbonaceous heat source prepared as described in Example 1, but without a second barrier coating layer of clay. The first barrier coating layer is provided by spray coating. Spray coating with glass is carried out with a suspension of ground glass 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% Bentonite powder, and a spray coating suspension containing 59.5% water are used. Glass powders having compositions and physical properties corresponding to glasses 1, 2, 3 and 4 in Table 1 may also be used.

Spray coating was done with a Sata MiniJet 3000 spray gun using a 0.5 mm, 0.8 mm or 1 mm spray nozzle on an SMC E-MY2B linear actuator at a speed of about 10 mm/s to about 100 mm/s. It is desirable to repeat spraying several times. After completion of spraying, the combustible carbonaceous heat source is pyrolyzed at about 700° C. for approximately 1 hour.
glass 1 glass 2 glass 3 glass 4 SiO ₂ 70 70 65 60 Na ₂ O 20 15 20 20 _K2O 5 CaO 10 8 10 10 MgO 4 5 5 Al ₂ O ₃ 3 Tg(℃) 517 539 512 465 A _20-300 (10 ^-6 K ^-1 ) 10.9 9.3 10.2 12.1 Kl-value 30 21 35 40

delete

KI-Value Calculated from Glass Composition in Weight Percent, Strain Temperature Tg, Thermal Expansion Coefficient A _20-300 and Composition

Example 4 - Preparation of Combustible Carbonaceous Heat Source Comprising a First Barrier Coating Layer of Aluminum

An incombustible, substantially air impermeable first barrier coating layer of aluminum is provided on the rear face of a combustible carbonaceous heat source prepared as described in Example 1, but without a second barrier coating layer of clay. The first barrier coating layer is provided by laser cutting an aluminum barrier from an aluminum bobbin band having a thickness of about 20 μm. The aluminum barrier has a single hole with a diameter of about 7.8 mm and an outer diameter of about 1.8 mm at its center to match the cross section of the combustible carbonaceous heat source of Example 1. In an alternative embodiment, the aluminum barrier has three apertures positioned to align with the three airflow channels provided within the combustible carbonaceous heat source. The aluminum barrier coating is formed by adhering an aluminum barrier to the rear face of a combustible carbonaceous heat source using any suitable adhesive.

In use, cooling air drawn into one or more air inlets located between the rear face of the combustible heat source and the downstream end of the aerosol-forming substrate is directed, while the user is smoking, to a smoking article (2) according to the first to ninth embodiments of the present invention. , 34, 38, 42, 44, 48) to decrease the temperature of the aerosol-forming substrate 10.

This advantageously prevents or inhibits a spike in the temperature of the aerosol-forming substrate 10 during smoking by a user, advantageously for smoking articles 2, 34, 38, 42, 44, 48) to minimize or reduce the effect of the user's smoking habit on the composition of the mainstream aerosol.

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

2, 34, 38, 42, 44, 48: smoking article
4: heat source
4b: rear part
6: front face
8: rear face
10: aerosol-forming substrate
10a: front part
12: conveying element, aerosol-forming substrate
14: Mouthpiece
16: outer wrapper
18: steam airflow channel
20: Tobacco-based substances
22: plug wrap
26: filter material
28: filter plug wrap, heat conduction element
30: heat conduction element
32: first inlet
36: second inlet
40: first barrier
46: second barrier

Claims (15)

As a smoking article,
a combustible heat source having opposing front and rear faces;
one or more airflow channels extending from the front face to the rear face 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;
a transport element between the aerosol-forming substrate and the mouthpiece, the transport element comprising an open-ended tubular hollow body; and
one or more air inlets located downstream of the rear face of the combustible heat source and upstream of the mouthpiece, wherein the 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;
wherein, in use, air drawn through the aerosol-forming substrate enters the smoking article through the one or more airflow channels and the one or more air inlets and at least a portion of the air drawn through the aerosol-forming substrate is dependent on the combustible properties of the combustible heat source. come into direct contact with the
during puffing by a user, cooling air drawn through 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 reduces the temperature of the aerosol-forming substrate;
The one or more air inlets may include one or more first air inlets around the periphery of the aerosol-forming substrate, or one or more second air inlets between the rear face of the combustible heat source and the aerosol-forming substrate, or of the aerosol-forming substrate. A smoking article comprising a combination of one or more first air inlets around the periphery and one or more second air inlets between the rear face of the combustible heat source and the aerosol-forming substrate. A 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. (i) a non-combustible, air-impermeable first barrier between the rear face of the combustible heat source and the aerosol-forming substrate; and (ii) a non-combustible, air-impermeable second barrier between the combustible heat source and the one or more airflow channels. (i) a non-combustible, air-impermeable first barrier between the rear face of the combustible heat source and the aerosol-forming substrate, wherein the first barrier comprises a first barrier provided on the rear face of the combustible heat source; A smoking article comprising a barrier coating layer. (ii) a non-combustible, air-impermeable second barrier between the combustible heat source and the one or more airflow channels, wherein the second barrier comprises a second barrier provided on an inner surface of the one or more airflow channels. A smoking article comprising a barrier coating layer. delete 6. The method of any one of claims 1 to 5, wherein the aerosol-forming substrate abuts the rear face of the combustible heat source, and wherein the one or more air inlets are located around the periphery of the aerosol-forming substrate with one or more first air inlets. A smoking article comprising wealth. A smoking article according to claim 1 , wherein the aerosol-forming substrate is spaced from the rear face of the combustible heat source. delete According to any one of claims 1 to 5,
The smoking article of claim 1 further comprising a heat conducting element around the rear portion of the combustible heat source and at least the front portion of the aerosol-forming substrate. 6. A smoking article according to any preceding claim, wherein the aerosol-forming substrate comprises a tobacco-based material and at least one aerosol former. 6. A smoking article according to any preceding claim, wherein the combustible heat source is a combustible carbonaceous heat source. 6. A smoking article according to any one of claims 1 to 5, wherein the combustible heat source comprises an ignition aid. delete 6. 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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