TWI657751B - Smoking article comprising a combustible heat source with at least one airflow channel - Google Patents

Abstract

A smoking article (2, 34, 38, 42, 44, 48) includes: a flammable heat source (4), which has a relatively front surface (6) and a back surface (8); one or more airflow channels (18), The front face (6) of the combustible heat source (4) extends to the back face (8) of the combustible heat source (4); an aerosol-forming substrate (10), which is downstream of the back face (8) of the combustible heat source (4); A cigarette holder (14) downstream of the aerosol-forming substrate (10); and one or more air inlets (32, 36) located downstream of the back (8) of the combustible heat source (4) and the cigarette holder (14) Upstream. The one or more air inlets (32, 36) are located between the back surface (8) of the combustible heat source (4) and the downstream end of the aerosol-forming substrate (10). In use, the air introduced through the aerosol-forming substrate (10) enters the smoking article (2, 2) through the one or more air flow channels (18) and the one or more air inlets (32, 36). 34, 38, 42, 44, 48) and at least some of the air introduced through the aerosol-forming substrate (10) are in direct contact with a combustible portion of the combustible heat source (4).

Description

Cigarette containing a flammable heat source with at least one air flow channel

The invention relates to a smoking article, which comprises a combustible heat source having opposite front and back surfaces and at least one air flow channel, and an aerosol-forming substrate downstream of the combustible heat source.

Some tobacco products have been proposed in the art in which tobacco is heated instead of burning. One of the purposes of such 'heated' cigarettes is to reduce the known harmful smoke constituents produced by the combustion and pyrolytic degradation of tobacco in conventional cigarettes. In a known type of heated smoking article, an aerosol is generated by heat transfer from a combustible heat source to an aerosol-forming matrix. The aerosol-forming substrate may be located within, around, or downstream of the combustible heat source. During smoking, volatile compounds are released from the aerosol-forming matrix and entrained in the air inhaled through the cigarette by heat transfer from the combustible heat source. When the release compounds cool, they condense to form an aerosol inhaled by the user. Generally, air is drawn into such known heated tobacco products through one or more airflow channels provided by the 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 smoking article including a combustible heat source, an aerosol-forming substrate downstream of the combustible heat source, and a rear portion of the combustible heat source and an adjacent front of the aerosol-forming substrate. A thermally conductive element near the part and in direct contact with it. In order to provide a controlled amount of forced convective heating of the aerosol-forming substrate, at least one longitudinal airflow channel is provided through the combustible heat source.

In known heated tobacco products where heat transfer from the combustible heat source to the aerosol-forming substrate occurs primarily due to forced convection, the temperature of the forced convective heat transfer and thus the aerosol-forming substrate is based on the user's smoking behavior There are quite a few differences. As a result, the constituents of the mainstream aerosol produced by such known heating cigarettes and thus their sensory properties may be disadvantageously quite sensitive to the puffing regime of the user.

In addition, in known heated smoking articles that include one or more airflow channels along the combustible heat source, direct contact between air inhaled through the one or more airflow channels and the combustible heat source during a user's puff Causes the intensification of combustion of the combustible heat source. Therefore, the dense suction morphology may cause a sufficiently high forced convective heat transfer, and a spike in the temperature of the aerosol-forming substrate occurs, which disadvantageously causes pyrolysis of the aerosol-forming substrate and even possible Local combustion. As used herein, the term 'spike' is used to describe the short-term increase in the temperature of the aerosol-forming substrate. As a result, the degree of undesired pyrolysis and combustion by-products in mainstream aerosols produced by such known heated cigarettes may also disadvantageously vary significantly depending on the particular smoking morphology adopted by the user.

US 4,714,082 discloses a smoking article including a combustible fuel element, an aerosol generating device, and a mouth-end filter. In the embodiments shown in FIGS. 1, 3, 4, 6, 7, 8 and 9, the combustible fuel element 10 includes one or more longitudinally extending holes 16. In these embodiments, there is no air inlet between the back surface of the combustible fuel element 10 and the downstream end of the aerosol generating device 12. In the embodiment shown in FIG. 2, the aerosol generating device 12 includes a thermally stable carbon-containing substrate 28 and the combustible fuel element 24 via a thermally conductive rod 26 and a foil lined paper tube 14 Connected to the aerosol generating device 12. This embodiment includes a gap 30 between the combustible fuel element 10 and the base body 28 and a portion of the foil liner 14 surrounding the gap 30 includes a plurality of peripheral holes that allow sufficient air to enter the gap to provide a suitable pressure drop. 32. In this embodiment, the combustible fuel element 24 does not include any longitudinally extending holes 16.

It is known to include additives in a combustible heat source that heats a smoking article in order to improve the ignition and combustion characteristics of the combustible heat source. The contents of the ignition and combustion additives cause decomposition and reaction products that adversely enter the air inhaled during use through one or more airflow channels provided along such a known source of flammable heat for heating the smoking article.

In order to facilitate aerosol formation, the aerosol-forming matrix of the heated smoking article usually includes a polyhydric alcohol like glycerol or other known aerosol-formers. During storage and smoking, such aerosol formations may migrate from aerosol-forming substrates known to heat tobacco products to their flammable heat sources. Migration of aerosol products to a flammable heat source that is known to heat tobacco products can adversely cause the aerosol products to decompose, particularly during smoking of the heated tobacco products.

There is still a need to heat a smoking article, which includes a combustible heat source with a relatively front and back surface and an aerosol-forming substrate downstream of the back of the combustible heat source, wherein the temperature of the aerosol-forming substrate can be avoided in a densely drawn form. Peak. In particular, there is still a need to heat a smoking article that includes a combustible heat source with a relatively front and back surface and an aerosol-forming substrate downstream of the backside of the combustible heat source, where substantially no aerosol formation occurs in a densely drawn form. Burning or pyrolysis of the substrate occurs.

According to the present invention, a smoking article is provided, comprising: a combustible heat source having a relatively front and back; one or more airflow channels extending from the front of the combustible heat source to the back of the combustible heat source; an aerosol-forming substrate, It is downstream of the back of the combustible heat source; a cigarette holder is downstream of the aerosol-forming substrate; and one or more air inlets are positioned downstream of the back of the combustible heat source and upstream of the cigarette holder. The one or more air inlets are located between the back of the combustible heat source and the downstream end of the aerosol-forming substrate. In use, the air introduced through the aerosol-forming substrate enters the tobacco product through the one or more airflow channels and the one or more air inlets, and at least some of the air introduced through the aerosol-forming substrate and One of the combustible heat sources is in direct contact with the combustible portion.

As used herein, the term 'aerosol-forming substrate' is used to describe a substrate capable of releasing volatile compounds immediately upon heating, which volatile compounds can form an aerosol. The aerosol generated from the aerosol-forming substrate of the smoking article according to the present invention may be visible or not Visible and may include vapors (eg, particulate matter, which is in a gaseous state, which is usually a liquid or solid at room temperature) and droplets of gas and condensed vapors.

The aerosol-forming substrate may be in the form of a plug or a segment, which includes a material that is externally covered by a wrapper that can release volatile compounds immediately after heating. The volatile compounds can form An aerosol. In the case where an aerosol-forming substrate is in the form of such an insert or segment, the entire insert or segment containing the package is regarded as the aerosol-forming substrate.

As used herein, the terms 'distal', 'upstream' and 'front' and 'proximal', 'downstream' and 'rear' are used to describe the component or part of the component relative to the use The relative position of the person in the direction of smoking the cigarette during its use. The smoking article according to the present invention includes a proximal end, and in use, the aerosol leaves the smoking article through the proximal end for transmission to a user. The proximal end of the smoking article may also be referred to as the mouth end. In use, the user smokes on the mouth end of the cigarette so as to inhale the aerosol generated by the cigarette.

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

The front side 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 point where the combustible heat source is farthest from the cigarette. Proximal end. The back side 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 cigarette.

As used herein, the term 'length' is used to describe the largest dimension in the longitudinal direction of the smoking article. That is, the largest dimension in the direction between the proximal end and the opposite 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 flammable heat source through which the user's inhalation can introduce air downstream.

As used herein, the term 'direct contact' is used to describe the surface of a flammable portion of the flammable heat source and enter the smoking article through the one or more airflow channels and the one or more air inlets and pass through the gas. The sol forms the contact between at least some of the air introduced by the matrix.

The smoking article according to the present invention includes a non-blind combustible heat source. As used herein, the term 'straight-through' 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 " closed " is used to describe that the air flow channel extends through the interior of and is surrounded by the combustible heat source.

In another case or in addition, the one or more airflow channels may include one or more non-enclosed airflow channels. For example, the one or more airflow paths may include One or more grooves or other non-closed airflow channels extending along the outside of the combustible heat source.

The one or more airflow channels may include one or more closed airflow channels or one or more non-closed airflow channels or a combination thereof.

In some embodiments, the smoking article according to the present invention includes one, two, or three air flow channels extending from the front of the combustible heat source to the back of the combustible heat source.

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

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

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

It will be understood that in addition to one or more airflow channels through which air can be introduced due to inhalation by the user, the combustible heat source of the smoking article according to the present invention can also include air that cannot be inhaled by the user through One or more of the introduced channels closed or blocked.

For example, a smoking article according to the present invention may include a combustible heat source including one or more airflow channels extending from the front of the combustible heat source to the back of the combustible heat source, and from the front of the combustible heat source only partially along the combustible heat source. One or more closed channels extending in length.

The contents of one or more closed air channels increase the surface area of the combustible heat source exposed to the oxygen of the air and can advantageously assist the ignition and continuous combustion of the combustible heat source.

The smoking article according to the present invention includes one or more air inlets located downstream of the back of the combustible heat source and upstream of the cigarette holder.

As used herein, the term 'air inlet' is used to describe holes, slits, slots or other holes through which air can be drawn into the smoking article.

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

The number, shape, size and position of these air inlets can be adjusted appropriately to achieve a good smoking performance.

In use, the air introduced through the aerosol-forming substrate of the smoking article enters the smoking article through the one or more airflow channels and the one or more air inlets. The inhaled air passes the smoking article downstream to the cigarette holder and exits the smoking article through its proximal end.

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

The air introduced into the smoking article through the one or more airflow channels through the aerosol-forming substrate of the smoking product may be in direct contact with a combustible portion of the combustible heat source as it passes through the one or more airflow channels.

In another case or in addition, the air introduced into the smoking article through the one or more airflow channels through the aerosol-forming substrate of the smoking article may be in direct contact with the back of the combustible heat source. In such embodiments, the air introduced into the smoking article through the one or more air inlets through the aerosol-forming substrate of the smoking article may also be in direct contact with the back of the combustible heat source.

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

During the user's puff, the cold air drawn through the one or more air inlets between the back of the combustible heat source and the aerosol-forming substrate advantageously reduces the aerosol-forming substrate of the smoking article according to the present invention. Of temperature. This advantageously prevents or suppresses the peak of the temperature of the aerosol-forming matrix of the smoking article according to the invention during the user's puff.

As used herein, the term " cold air " is used to describe ambient air that has not been significantly heated by the flammable heat source immediately after a user's puff.

By preventing or suppressing peaks in the temperature of the aerosol-forming substrate, the inclusion of one or more air inlets between the back of the combustible heat source and the downstream end of the aerosol-forming substrate advantageously assists in avoiding or reducing Combustion or pyrolysis of the aerosol-forming matrix of the smoking article according to the present invention in a densely drawn form. In addition, the contents of one or more air inlets between the back of the combustible heat source and the downstream end of the aerosol-forming substrate advantageously assist in minimizing or reducing the user's puff pattern. Influence of the composition of mainstream aerosols.

The one or more air inlets may include one or more first air inlets around the aerosol-forming substrate, wherein air may be drawn into the aerosol-forming substrate via the one or more first air inlets. . In such an embodiment, when in use, cold air is drawn into the aerosol of the smoking article through the first air inlets to form a matrix. The air sucked into the aerosol-forming substrate through the first air inlets passes the smoking article downstream from the aerosol-forming substrate to the cigarette holder and leaves the smoking article through its proximal end.

During the user's puff, the cold air inhaled through the one or more first air inlets around the aerosol-forming substrate advantageously reduces the temperature of the aerosol-forming substrate of the smoking article according to the present invention. This advantageously prevents or suppresses peaks in the temperature of the aerosol-forming matrix of the smoking article according to the invention during the user's puff.

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

In some embodiments, the aerosol-forming substrate may abut the back of the combustible heat source or a non-combustible substantially air impermeable first barrier provided on the back of the combustible heat source. coating).

As used herein, the term 'butt' is used to describe that the aerosol-forming substrate is in direct contact with the back of the combustible heat source or a non-combustible substantially air-impermeable first barrier coating disposed on the back of the combustible heat source.

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

In such embodiments, the one or more air inlets may include one or more second air inlets between the back of the combustible heat source and the aerosol-forming substrate. In use, cold air is drawn into the space between the combustible heat source and the aerosol-forming substrate through the second air inlets. The air drawn into the space between the combustible heat source and the aerosol-forming substrate through the second air inlets goes downstream from the space between the combustible heat source and the aerosol-forming substrate to the cigarette holder passes through the cigarette and through it Leave the cigarette at the proximal end.

During the user's puff, the cold air inhaled through the one or more second air inlets between the back of the combustible heat source and the aerosol-forming substrate advantageously reduces aerosol formation of the smoking article according to the present invention. The temperature of the substrate. This advantageously prevents or suppresses the peak of the temperature of the aerosol-forming matrix of the smoking article according to the invention during the user's puff.

It will be understood that the smoking article according to the present invention may include one or more first air inlets around the aerosol-forming substrate or one or one between the back of the combustible heat source and the aerosol-forming substrate. The above second air inlet or one or more first air inlets around the aerosol-forming substrate and one or more second air inlets between the back of the combustible heat source and the aerosol-forming substrate combination.

The smoking article according to the present invention may further include (i) a non-combustible substantially air-impermeable first barrier, which is between the back surface of the combustible heat source and the aerosol-forming substrate, or (ii) a non-combustible substantially air-impermeable second barrier, which is Between the combustible heat source and the one or more airflow channels.

It will be understood that the smoking article according to the present invention may not include (i) a non-combustible substantially air-impermeable first barrier between the back of the combustible heat source and the aerosol-forming substrate and (ii) an incombustible substantially air-impermeable A second barrier between the combustible heat source and the one or more airflow channels.

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

In the case where the smoking article according to the present invention further includes (i) a non-combustible substantially air-impermeable first barrier between the back surface of the combustible heat source and the aerosol-forming substrate, via the one or more airflow channels and the one or The air introduced by the aerosol-forming substrate into the tobacco product from more than one air inlet does not directly contact the back surface of the combustible heat source. However, in such embodiments, the air introduced into the smoking article through the one or more airflow channels through the aerosol-forming matrix does indeed combust with one of the combustible heat sources when passing through the one or more airflow channels. Partial direct contact.

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

The first barrier may abut one or both of the back surface of the combustible heat source and the aerosol-forming substrate. In another case, the first barrier may be separated from one or both of the aerosol-forming substrate and the cigarette holder.

The first barrier can be adhered or adhered to one or both of the back surface of the combustible heat source and the aerosol-forming substrate.

In some preferred embodiments, the first barrier rib includes a non-combustible substantially air-impermeable first barrier rib coating disposed on a back surface of the combustible heat source. In such an embodiment, the first barrier rib preferably includes a first barrier rib coating disposed at least substantially on the entire back surface of the combustible heat source. More preferably, the first barrier rib includes a first barrier rib coating disposed on the entire back surface of the combustible heat source.

In such embodiments, the first barrier coating allows air to be introduced downstream via the one or more airflow channels extending from the front of the combustible heat source to the back of the combustible heat source.

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

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

The contents of a non-combustible substantially air-impermeable first barrier between the back of the combustible heat source and the aerosol-forming substrate can also advantageously substantially prevent or suppress the aerosol of the smoking article during storage of the smoking article The components forming the matrix migrate to the combustible heat source.

In another option or in addition, the contents of a non-combustible substantially air-impermeable first barrier between the backside of the combustible heat source and the aerosol-forming substrate may also advantageously substantially prevent or inhibit the basis during the use of the cigarette. The components of the aerosol-forming substrate of the smoking article of the present invention migrate to the combustible heat source.

In the case where the aerosol-forming substrate includes at least one aerosol formation, the inclusion of a non-combustible substantially air-impermeable first barrier between the back of the combustible heat source and the aerosol-forming substrate may be particularly advantageous.

In such an embodiment, the contents of a non-combustible substantially air-impermeable first barrier between the back of the combustible heat source and the aerosol-forming substrate can advantageously prevent or inhibit the at least during storage and use of the tobacco product. An aerosol product migrates from the aerosol-forming substrate to the combustible heat source. Thus, it may be advantageous to substantially avoid or reduce the decomposition of the at least one aerosol product during the use of the smoking article.

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 some embodiments, the first barrier rib may be about 0.1 W / cm at 23 ° C and 50% relative humidity as measured according to a modified transient plane source (MTPS) method. It is formed by a material having a bulk thermal conductivity between feet / grams (W / (m · K)) and about 200 watts / meter · grams (W / (m · K)).

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

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

Preferred materials that can form the first barrier rib include clay and glass. Preferred materials that can form the first barrier rib include copper, aluminum, stainless steel, alloy, aluminum oxide (Al ₂ O ₃ ), resin, and mineral glue.

In some embodiments, the first barrier comprises a clay coating comprising a 50/50 mixture of pennite and kaolin disposed on the back of the combustible heat source. In other preferred embodiments, the first barrier includes a glass coating disposed on a back surface of the combustible heat source, and more preferably, a sintered glass coating.

In some particularly preferred embodiments, the first barrier includes an aluminum coating disposed on a back surface of the combustible heat source.

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

Due to the slight permeability of the clay to air, in the implementation side where the first barrier includes a clay coating disposed on the back of the combustible heat source, the clay coating preferably has at least about 50 microns (optimally, Between about 50 microns and about 350 microns).

In embodiments where the first barrier is formed of one or more materials like aluminum that is more impermeable to air, the first barrier may be thinner and generally preferably has a thickness of less than about 100 microns. The thickness, more preferably, has a thickness of about 20 microns.

In embodiments where the first barrier comprises a glass coating disposed on the back of the combustible heat source, the glass coating preferably has a thickness of less than about 200 microns.

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

Where the first barrier rib includes a first barrier rib coating disposed on the back of the combustible heat source, the first barrier rib coating may be applied by any suitable method known in the art to cover And adhere to the back of the combustible heat source, where such suitable methods include, but are not limited to, spray-coating, vapour deposition, dippig, material transfer (e.g., brush coating) (brushing) or gluing) or any combination thereof.

For example, the first can be made by forming a barrier in advance with the approximate size and shape of the combustible heat source and applying it to the back of the combustible heat source to at least substantially cover and adhere to the entire back of the combustible heat source, thereby forming the first Barrier coating. In another option, after the first barrier coating is applied to the back surface of the combustible heat source, the first barrier coating may be cut or made into a predetermined size. In a preferred embodiment, the aluminum foil is applied to the back side of the combustible heat source by bonding or pressing to the combustible heat source, and the aluminum foil is cut and made into a prescribed size so that the aluminum foil is at least approximately covered and adhered. The entire back surface of the combustible heat source is preferably covered and adhered to the entire back surface 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 coatings to the back of the combustible heat source. For example, one or more can be deposited by dipping the back of the flammable heat source in a solution or suspension of one or more suitable coatings or by brushing or spraying the solution or suspension of one or more suitable coatings or electrostatically. A powder or powder mixture of a suitable coating on the back of the combustible heat source to apply the first barrier coating To the back of the combustible heat source. In the case where the powder or powder mixture of one or more suitable coatings is electrostatically deposited on the back of the flammable heat source to apply the first barrier coating to the back of the flammable heat source, it is preferred that Water glass pre-treats the back of the combustible heat source. Preferably, the first barrier coating is applied by spraying.

The first barrier coating film may be formed by a single application of one or more solutions or suspensions of a suitable coating to the back of the combustible heat source. In another option, the first barrier coating film may be formed by multiple applications of a solution or suspension of one or more suitable coatings to the back of the combustible heat source. For example, the first, second, third, fourth, fifth, sixth, seventh or eighth consecutive application of a solution or suspension of one or more suitable coatings to the back of the combustible heat source may be used to form the first A barrier coating.

Preferably, the first barrier coating film may be formed by applying one or more solutions or suspensions of a suitable coating to the back of the combustible heat source one to ten times.

Therefore, after application of a solution or suspension of one or more suitable coating materials to the back of the combustible heat source, the combustible heat source can be dried to form the first barrier coating.

In the case where the first barrier coating film is formed by multiple applications of a solution or suspension of one or more suitable coatings to the back of the combustible heat source, it may be necessary to apply the solution or suspension between successive applications of the solution or suspension. Dry combustible heat sources.

In another option, or in addition to drying, after application of a solution or suspension of one or more coatings to the combustible heat source, (also) The coating on the combustible heat source may be sintered to form the first barrier coating. In the case where the first barrier coating is a glass or ceramic coating, the sintering system of the first barrier coating is particularly preferred. Preferably, the first barrier coating is sintered at a temperature of about 500 ° C to about 900 ° C and more preferably at a temperature of about 700 ° C.

In the case where the smoking article according to the present invention further includes (ii) a non-combustible substantially air-impermeable second barrier between the combustible heat source and the one or more air passages, the smoking article is entered through the one or more air passages The air introduced through the aerosol-forming substrate does not come into direct contact with a combustible portion of the combustible heat source when passing through the one or more airflow channels. However, in such embodiments, the air introduced through the aerosol-forming substrate into the smoking article via the one or more airflow channels does come into direct contact with the backside of the combustible heat source. In such embodiments, the air introduced into the smoking article through the one or more air inlets through the aerosol-forming substrate may also be in direct contact with the back of the combustible heat source.

When air sucked into the smoking article according to the present invention through the one or more air flow passages passes through the one or more air flow passages, the second barrier can advantageously substantially prevent or suppress a combustible heat source in the smoking article according to the present invention. Combustion and decomposition products formed during ignition and combustion enter the intake air. This is particularly advantageous where the combustible heat source includes one or more additives to assist in the ignition or combustion of the combustible heat source.

The contents of a non-combustible substantially air-impermeable second barrier between the combustible heat source and the one or more airflow channels can also be used The smoking period of the person advantageously substantially prevents or suppresses the intensification of the combustion of the combustible heat source of the smoking article according to the invention. This can substantially prevent or suppress peaks in the temperature of the aerosol-forming matrix during the user's puff.

By preventing or inhibiting the intensification of the combustion of the combustible heat source and thus preventing or inhibiting the excessive temperature increase of the aerosol-forming substrate, the combustion of the aerosol-forming substrate of the smoking article according to the present invention during the densely pumped form can be advantageously avoided Or pyrolysis. In addition, it is advantageous to minimize or reduce the effect of the user's puffing pattern on the composition of the mainstream aerosol of the smoking article according to the present invention.

The second barrier wall can be adhered or adhered to the combustible heat source.

In some preferred embodiments, the second barrier comprises a non-combustible substantially air-impermeable second barrier coating disposed on an inner surface of the one or more airflow channels. In such an embodiment, the second barrier wall preferably includes a second barrier wall coating disposed at least substantially on the entire inner surface of the one or more airflow channels. More preferably, the second barrier comprises a second barrier coating disposed on the entire inner surface of the one or more airflow channels.

In other embodiments, the second barrier coating may be provided by the insertion of a liner into the one or more airflow channels. For example, where the one or more airflow channels include one or more sealed 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. One.

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 rib has a low thermal conductivity.

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

The second barrier may be formed of one or more suitable materials that are substantially thermally stable and non-combustible at the temperature reached 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, aluminum oxide, titanium dioxide, silicon dioxide, silicon dioxide-alumina, zirconia, and cerium oxide; zeolites ; Zirconium phosphate; and other ceramic materials or combinations thereof.

Preferred materials that can form the second barrier include clay, glass, aluminum, iron oxide, and combinations thereof. If necessary, a catalytic component like a component for promoting 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.

Where the second barrier includes a second barrier coating disposed on the inner surface of the one or more airflow channels, the first barrier can be formed by any suitable method such as that described in US-A-5,040,551. Two barrier coatings are applied to the inner surface of the one or more airflow channels. For example, the inner surface of the one or more airflow channels may be sprayed, wetted or painted with a solution or suspension of the second barrier coating. In some embodiments, when extruded into the combustible heat source, by WO-A2-2009 / 074870 The process described applies the second barrier coating to the inner surface of the one or more airflow channels.

Preferably, the smoking article according to the present invention includes an outer packaging which circumscribes the aerosol-forming substrate and at least a rear portion of the combustible heat source. When assembling the cigarette, the outer package should hold the combustible heat source and the aerosol of the cigarette to form a matrix.

More preferably, the smoking article according to the present invention includes an outer packaging which circumscribes the mouthpiece, the aerosol-forming substrate, any other components of the smoking article downstream of the aerosol-forming substrate and upstream of the mouthpiece, and the At least the rear of the combustible heat source.

Preferably, the outer packaging is substantially air-impermeable.

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

One or more air inlets are provided in the outer package and any other materials that enclose the components of the smoking article according to the present invention between the back of the combustible heat source and the downstream end of the aerosol-forming substrate, wherein air can pass The one or more air inlets are drawn into the one or more airflow paths.

In the case where the one or more air inlets include one or more first air inlets around the aerosol-forming substrate, the one or more first air inlets are provided in the outer package and Any other material that surrounds the aerosol to form a matrix.

The one or more air inlets include one or more second between the back of the combustible heat source and the aerosol-forming substrate. In the case of an air inlet, the one or more second air inlets are disposed in the outer package and any underlying material.

Preferably, the combustible heat source is a carbon-containing heat source. As used herein, the term 'carbon-containing' is used to describe a flammable heat source containing carbon. Preferably, the combustible carbonaceous heat source used in the smoking article according to the present invention has at least about 35%, more preferably, at least about 40%, and most preferably, at least about 45% carbon content.

In some embodiments, the combustible heat source according to the present invention is a combustible carbon-based heat source. As used herein, the term 'carbon-based heat source' is used to describe a heat source mainly composed of carbon.

The combustible carbon-based heat source used in the smoking article according to the present invention has a carbon content of at least about 50%. For example, the combustible carbon-based heat source used in the smoking article according to the present invention may have a carbon content of at least about 60%, or at least about 70%, or at least about 80% based on the dry weight of the combustible carbon-based heat source.

The smoking article 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 can be combined with the one or more carbonaceous materials. Preferably, the one or more adhesives are organic adhesives. Suitable known organic binders include, but are not limited to, gums (e.g., guar gum), modified cellulose, and cellulose derivatives (e.g., methyl cellulose, carboxymethyl cellulose) (carboxymethyl cellulose, hydroxypropyl cellulose, and hydroxypropyl methylcellulose), flour, starch, sugar, vegetable oil, and combinations thereof.

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

Instead of or in addition to one or more adhesives, the combustible heat source used in the smoking article according to the present invention (also) may include one or more additives in order to improve the characteristics of the combustible heat source. Suitable additives include, but are not limited to, additives to promote curing of the combustible heat source (e.g., sintering aids), additives to promote ignition of the combustible heat source (e.g., like perchlorate ( perchlorates, chlorates, nitrates, peroxides, permanganates, zirconium, and combinations of oxidants), used to promote the combustion of the combustible heat source Additives (e.g., potassium and potassium salts like potassium citrate) and additives to promote the decomposition of one or more gases produced by the combustion of the combustible heat source (e.g., like CuO, Fe ₂ O ₃ and Al ₂ O ₃ catalysts).

The smoking article according to the present invention includes a first barrier coating provided on the back surface of the combustible heat source, and such an additive may be incorporated into the combustible before or after the first barrier coating is applied to the back surface of the combustible heat source. Heat source.

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

As used herein, the term 'ignition aid' is used to indicate a material that releases one or both of energy and oxygen during the ignition of the combustible heat source, wherein the material releases one or both of energy and oxygen The rate is not limited by the surrounding oxygen diffusion. In other words, the rate at which one or both of the energy and oxygen is released by the material during the ignition of the 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 refer to an elemental metal that releases energy during the ignition of the combustible heat source, wherein the ignition temperature of the elemental metal is below about 500 ° C and the heat of combustion of the elemental metal At least about 5kJ / g.

As used herein, the term 'ignition aid' does not include alkali metal salts of carboxylic acids (e.g., alkali metal citrate salts, alkali metal acetates acetate salts) and alkali metal succinate salts), alkali metal halide salts (e.g., alkali metal chloride salts), alkali metal carbonates metal carbonate salts) or alkali metal phosphate salts, which are thought to mitigate carbon burning. Even when present in large amounts relative to the total weight of the combustible heat source, such alkali metal burnt salt does not release enough energy during the ignition of the combustible heat source to produce an acceptable aerosol during the earlier puff.

Examples of suitable oxidants include, but are not limited to: nitrates (e.g. potassium nitrate, calcium nitrate, strontium nitrate, sodium nitrate nitrate), barium nitrate, lithium nitrate, aluminum nitrate, and iron nitrate); nitrites; other organic and inorganic nitro compounds; chlorates ( chlorates (for example, sodium chlorate and potassium chlorate); perchlorates (for example, sodium perchlorate); chlorites; bromate Bromates (e.g. sodium bromate and potassium bromate); perbromates; bromites; borates (e.g. sodium borate) and potassium borate); ferrates (e.g., barium ferrate); ferrites; manganates (e.g. potassium manganate)); permanganates (for example, potassium permanganate); organic peroxides (for example, benzoyl peroxide and acetone peroxide ( acetone peroxide)); inorganic peroxides (e.g., Hydrogen peroxide, strontium peroxide, magnesium peroxide, calcium peroxide, barium peroxide, zinc peroxide, and lithium peroxide (lithium peroxide)); superoxides (for example, potassium superoxide and sodium superoxide); iodates; periodates; iodic acid Iodites; sulphates; sulfites; other sulfoxides; phosphate (phosphates); phosphites (phospinates); phosphites (phosphites); and phosphites (phosphanites).

Although the ignition and combustion characteristics of the combustible heat source are advantageously improved, the contents of the ignition and combustion additives can produce undesirable decomposition and reaction products during the use of the smoking article. For example, the decomposition of nitrates contained in the combustible heat source to assist the ignition of the combustible heat source can lead to the formation of nitrogen oxides.

When air sucked into the smoking article according to the present invention through the one or more air passages passes through the one or more air passages, a noncombustible between one or more air passages of the smoking article according to the present invention and a combustible heat source The contents of the substantially air-impermeable second barrier can advantageously substantially prevent or inhibit such decomposition and reaction products from entering the intake air.

A combustible carbonaceous heat source for use in a smoking article according to the present invention can be prepared as described in a conventional technique known to those skilled in the art.

By mixing one or more carbonaceous materials with one or more binders and other additives (if included) and forming the mixture into a desired shape in advance, it is preferably formed into a smoking article for use in accordance with the present invention. Combustible carbonaceous heat source. Any suitable known ceramic forming method (e.g., slip casting, extrusion, injection moulding, and die compaction or pressing) can be used to preform one or more The mixture of carbonaceous material, one or more binders, and optionally other additives becomes a desired shape. In some preferred embodiments, by The mixture is previously formed into a desired shape by compression molding or extrusion molding or a combination thereof.

Preferably, a mixture of one or more carbonaceous materials, one or more binders, and other additives is formed into an elongated rod in advance. However, it will be understood that a mixture of one or more carbonaceous materials, one or more binders, and other additives may be preformed into other desired shapes.

After forming, especially after extrusion, the elongated rod or other desired shape is preferably dried to reduce its moisture content, and then, it is sufficient to carbonize the one or more adhesives (if present) Bottom) and the pyrolysis of the elongated rod or other desired shape in a non-oxidizing environment at a temperature that substantially removes any volatiles in the elongated rod or other shape. The elongated rod or other desired shape is preferably pyrolyzed in a nitrogen environment at a temperature between about 700 ° C and about 900 ° C.

In some embodiments, at least one metal nitrate precursor is included in a mixture of one or more carbonaceous materials, one or more binders, and other additives. Incorporated into this combustible heat source. Thus, the at least one metal nitrate precursor is subsequently converted in-situ to at least one metal nitrate by treating the pyrolyzed preformed cylindrical rod or other shape with an aqueous nitric acid solution. In one embodiment, the combustible heat source includes at least one metal nitrate having a thermal decomposition temperature of less than about 600 ° C (more preferably, less than about 400 ° C). Preferably, the at least one metal nitrate has a decomposition temperature between about 150 ° C and about 600 ° C (more preferably, between about 200 ° C and about 400 ° C).

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

The inclusion of at least one metal nitrate advantageously causes this type of combustion heat source to ignite not only at one of its surfaces, but also from the inside. Preferably, the at least one metal nitrate is present in the combustible heat source in an amount between about 20% and about 50% based on the dry weight of the combustible heat source.

In other embodiments, the combustible heat source includes at least one peroxide or superoxide, which actively releases oxygen at a temperature of less than about 600 ° C, more preferably, at a temperature of 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, at a temperature between about 200 ° C and about 400 ° C, most preferably, At a temperature of about 350 ° C, oxygen is actively released.

In use, exposure of the combustible heat source to a traditional yellow flame igniter or other ignition device should cause the at least one peroxide or superoxide to decompose and release oxygen. This promotes an initial increase in the temperature of the combustible heat source and also assists the ignition of the combustible heat source. After the 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 advantageously causes the flammable heat source to ignite not only at one of its surfaces, but also from the inside.

The combustible heat source preferably has a porosity between about 20% and about 80%, more preferably between about 20% and about 60%. Where the combustible heat source includes at least one metal nitrate, this advantageously allows oxygen to diffuse into most combustible heat sources at a rate sufficient to maintain combustion when the at least one metal nitrate is decomposed and combusted. Even more preferably, the combustible heat source has between about 50% and about 70%, and more preferably between about 50% and about 60, as measured by, for example, mercury porosimetry or helium pycnometry. Porosity between%. The required porosity can be easily accomplished during the production of the combustible heat source using conventional methods and techniques.

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

Preferably, the combustible heat source has a mass between about 300 mg and about 500 mg, and 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, and more preferably, between about 7 mm and about 8 mm.

Preferably, the combustible heat source has a substantially uniform diameter. However, in another option, the combustible heat source may be tapered such that the diameter of the rear portion of the combustible heat source is larger than the diameter of the front portion. A combustible heat source that is substantially cylindrical is particularly preferred. The combustible heat source may be, for example, a cylinder or cone having a substantially circular cross section or a cylinder or cone having a substantially elliptical cross section.

The smoking article according to the present invention preferably includes an aerosol-forming substrate containing at least one aerosol-former and a material capable of releasing volatile compounds in response to heating. The aerosol-forming matrix may include other additives and ingredients, including but not limited to humectants, flavourants, binders, and mixtures thereof.

Preferably, the aerosol-forming substrate comprises nicotine. More preferably, the aerosol-forming substrate comprises tobacco.

The at least one aerosol product may be any suitable known compound or mixture of compounds that contributes to the formation of a thick and stable aerosol during use and is substantially resistant to thermal degradation at the operating temperature of the smoking article. Suitable aerosol formations are well known in the art and include, for example, polyhydric alcohols, polyol esters such as glycerol mono-, di- or triacetate ( esters of polyhydric alcohols) and mono-, di- or polycarboxylic acid aliphatic esters of mono-, like dimethyl dodecanedioate and dimethyl tetradecanedioate di- or polycarboxylic acids). Preferred aerosol-generating polyols or mixtures thereof (e.g., triethylene glycol, 1,3-butanediol) and most suitable for use in tobacco products according to the present invention Best glycerine).

The material capable of emitting volatile compounds in response to heating may be a certain amount of plant-based material. The material capable of emitting volatile compounds in response to heating may be a certain amount of homogeneous vegetable material. For example, the aerosol-forming substrate may include one or more materials obtained from plants Such plants include, but are not limited to: tobacco; tea (for example, green tea); peppermint; laurel; eucalyptus; basil; sage; verbena Genus (verbena); and tarragon.

Preferably, the material capable of emitting volatile compounds in response to heating is a certain amount of tobacco material, and most preferably, a certain amount of homogeneous tobacco material.

The aerosol-forming substrate may be in the form of an insert or a segment, which includes a material that is enveloped by paper or other packaging that emits volatile compounds in response to heat. As described above, in the case where the aerosol-forming substrate is in the form of such an insert or segment, the entire insert or segment including any package is regarded as the aerosol-forming substrate.

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

In a preferred embodiment, the aerosol-forming substrate includes a plug of tobacco material wrapped in a plug wrap. In a particularly preferred embodiment, the aerosol-forming substrate includes an insert of homogeneous tobacco material wrapped in an insert package.

Preferably, the smoking article according to the present invention further comprises a heat conducting element around the rear portion of the combustible heat source and at least the front portion of the aerosol-forming substrate. The thermally conductive element is preferably resistant to combustion. In some embodiments, the thermally conductive element is oxygen-limited. In other words, the thermally conductive element inhibits or resists oxygen from passing through the thermally conductive element to the combustible heat source.

In some embodiments, the thermally conductive element may be in direct contact with the rear of the combustible heat source and the aerosol-forming substrate. In such real In an embodiment, the thermally conductive element provides a thermal link between the combustible heat source of the smoking article according to the present invention and the aerosol-forming substrate.

In other specific examples, the thermally conductive element can be separated from one or both of the back of the combustible heat source and the aerosol-forming substrate, so that the thermally conductive element and the back of the combustible heat source and the aerosol-forming substrate can be separated. There is no direct contact between one or both.

Suitable thermally conductive elements for use in smoking articles according to the present invention include, but are not limited to: metal foil packaging (e.g., aluminum foil packaging, steel packaging, iron foil packaging, and copper foil packaging); and metal alloy foil packaging Thing.

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

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

In some embodiments, the thermally conductive element may surround the entire length of the aerosol-forming substrate.

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

In embodiments where the thermally conductive element may only surround the front portion of the aerosol-forming substrate, the aerosol-forming substrate preferably extends downstream at least about 3 mm across the thermally conductive element. More preferably, the aerosol-forming substrate extends downstream from the thermally conductive element by about 3 mm to about 10 mm. Of course However, the aerosol-forming substrate can extend downstream beyond the thermally conductive element by less than 3 mm.

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

The smoking article according to the invention comprises a cigarette holder downstream of the aerosol-forming substrate.

Preferably, the cigarette holder is of low filtration efficiency, more preferably, of extremely low filtration efficiency. The cigarette holder may be a single-segment or component cigarette holder. In another option, the cigarette holder may be a multi-segment or multi-component cigarette holder.

The cigarette holder may include a filter including one or more suitable known filter materials. Suitable filters are known in the art and include, but are not limited to, cellulose acetate and paper. In another case, or in addition, the cigarette holder may include one or more sections that include absorbents, adsorbents, perfumes, and other aerosol modifiers and additives, or combinations thereof.

The smoking article according to the present invention preferably further includes a transfer element or a spacer element between the aerosol-forming substrate and the cigarette holder.

The conversion element can abut one or both of the aerosol-forming substrate and the cigarette holder. In another case, the conversion element may be separated from one or both of the aerosol-forming substrate and the cigarette holder.

The contents of the conversion element advantageously allow cooling of the aerosol produced by the heat transfer from the combustible heat source to the aerosol-forming substrate. The inclusion of the conversion element also advantageously allows the total length of the smoking article according to the invention to be adjusted to a desired value, for example, to a length similar to a conventional cigarette, by appropriate selection of the length of the conversion element.

The conversion element may have a length between about 7 mm and about 50 mm, for example, a length between about 10 mm and about 45 mm or between about 15 mm and about 30 mm. The conversion element may have other lengths based on the desired total length of the smoking article and the presence and length of other components within the smoking article.

Preferably, the conversion element includes at least one open-end tubular hollow body. In such an embodiment, in use, when the smoking article is inhaled through the one or more air inlets from the aerosol-forming substrate to the mouthpiece passing downstream through the smoking article, it passes through the at least one Open-end tubular hollow body.

The conversion element may include 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 the 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, plastic, such cellulose acetate, ceramics, and combinations thereof.

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

The aerosol cooling element may include a gathered sheet selected from the group consisting of metal foil, polymer material, and substantially non-porous paper or paperboard. In some embodiments, the aerosol cooling element may include a corrugated sheet selected from the group consisting of polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), and polyethylene terephthalate (PET). , Polylactic acid (PLA), cellulose acetate (CA) and aluminum foil.

In certain preferred embodiments, the aerosol cooling element may include a corrugated sheet of biodegradable polymer material, such as polylactic acid (PLA) or Mater-Bi® grade (commercially available starch Based copolyesters).

The smoking article according to the present invention may include one or more aerosol modifiers downstream of the aerosol-forming substrate. For example, one or more of the cigarette holder, the conversion element, and the aerosol cooling element of the smoking article according to the present invention may include one or more aerosol modifiers.

Suitable aerosol modifiers include, but are not limited to: perfumes and chemesthetic agents.

As used herein, the term " fragrance " is used to describe any agent that, during use, gives one or both of the aerosol taste and odor produced by the aerosol-forming matrix of the tobacco product.

As used herein, the term 'substance sensory agent' is used to describe what the user's mouth or olfactory cavity can perceive by means other than or in addition to perception via taste or olfactory receptor cells. Any agent. The perception of a substance sensor is usually through the "trigeminal nerve "Trigeminal response" through the trigeminal nerve, glossopharyngeal nerve, vagus nerve, or a combination thereof. Generally, the perception of a physical sensory agent is a hot, spicy, cool or soothing sensation.

The smoking article according to the present invention may include one or more aerosol modifiers, which are perfumes and material-sensing agents downstream of the aerosol-forming substrate. For example, one or more of the cigarette holder, the conversion element, and the aerosol cooling element of the smoking article according to the present invention may include menthol or another flavor that provides a cooling material sensation effect.

The smoking articles according to the invention can be assembled using known methods and machines.

2‧‧‧ Tobacco

4‧‧‧ Combustible heat source

4b‧‧‧ rear

6‧‧‧ front

8‧‧‧ back

10‧‧‧ aerosol forms matrix

10a‧‧‧Front

12‧‧‧ conversion element

14‧‧‧ cigarette holder

16‧‧‧ Outer packaging

18‧‧‧ central airflow channel

20‧‧‧ cylindrical insert

22‧‧‧ plug-in package

24‧‧‧ Cylindrical Open End Hollow Pipe

26‧‧‧ cylindrical insert

28‧‧‧ Filter insert package

30‧‧‧ Thermal conductive element

32‧‧‧first air inlet

34‧‧‧ Tobacco

36‧‧‧Second air inlet

38‧‧‧ Tobacco

40‧‧‧The first barrier

42‧‧‧ Tobacco

44‧‧‧ Tobacco

46‧‧‧Second Barrier

48‧‧‧ Tobacco

The invention will be further described by way of example only with reference to the accompanying drawings, wherein: Fig. 1a) shows an exploded view of a smoking article according to a first embodiment of the invention; Fig. 1b) shows a second implementation according to the invention Fig. 1c) shows an exploded view of a smoking article according to a fourth embodiment of the present invention; Fig. 1d) shows an exploded view of a smoking article according to a fifth embodiment of the present invention; Fig. 1e ) Figure shows an exploded view of a smoking article according to a seventh embodiment of the present invention; Fig. 1f) shows an exploded view of a smoking article according to an eighth embodiment of the present invention; Fig. 2 shows a schematic longitudinal sectional view of a smoking article according to the first embodiment of the present invention shown in Fig. 1a); and Fig. 3 shows a schematic longitudinal sectional view of a smoking article according to a second embodiment of the present invention shown in Fig. 1b).

The smoking article 2 according to the first embodiment of the present invention shown in Figs. 1a) and 2 includes a flammable heat source 4 with a front surface 6 and an opposite back surface 8, an aerosol-forming substrate 10, a conversion Element 12 and a cigarette holder 14. As shown in FIG. 2, the aerosol-forming substrate 10, the conversion element 12, the cigarette holder 14, and the rear of the combustible heat source 4 are wrapped in a sheet of outer packaging 16 (for example, low-permeability cigarette paper). .

The combustible heat source 4 includes a central airflow channel 18 (indicated by dashed lines in FIG. 1 a) extending from the front face 6 of the combustible heat source 4 to the back face 8 thereof.

The aerosol-forming substrate 10 is located directly downstream of the back surface 8 of the combustible heat source. The aerosol-forming substrate 10 includes a cylindrical insert 20 containing a homogeneous tobacco material, including an aerosol product such as, for example, glycerol, which is enclosed in an insert package 22.

The conversion element 12 is located directly downstream of the aerosol-forming substrate 10 and includes a cylindrical open-end hollow tube 24 containing a suitable material such as paper, cardboard, or cellulose acetate tow.

The cigarette holder 14 is directly downstream of the conversion element 12 at the proximal end of the cigarette 2. The cigarette holder 14 includes a cylindrical insert 26 containing a suitable filter material, such as cellulose acetate tow having extremely low filtration efficiency, which is enclosed in a filter insert package 28.

The smoking article may further include a tipping paper tape (not shown) surrounding the downstream end portion of the outer package 16.

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

The smoking article 2 according to the first embodiment of the present invention includes one or more air inlets located downstream of the back surface 8 of the combustible heat source 4 and upstream of the cigarette holder 14. The one or more air inlets are located between the back surface 8 of the combustible heat source 4 and the downstream end of the aerosol-forming substrate 10 and include one or more first air inlets 32 located around the aerosol-forming substrate 10.

As shown in FIG. 2, the surroundings of the first air inlet 32 are provided in the insert package 22 and the overwrap 16 of the aerosol-forming substrate 10 to allow cold air (at 1a) and 2 Dotted arrow To the head) into the aerosol-shaped substrate 10. It will be understood that in other embodiments of the present invention (not shown) around the entire length of the aerosol-forming substrate 10 and in contact with the heat-conducting element 30, an insert package for the aerosol-forming substrate 10 may be provided. The object 22, the overlying heat conducting element 30 and the overlying outer package 16 are provided around a first air inlet 32 to allow cold air to enter the aerosol-forming substrate 10.

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 sucks on the cigarette holder 14. When the user sucks on the cigarette holder 14, the air (indicated by the dashed arrows in Figs. 1a and 2) is drawn into the cigarette 2 through the central airflow channel 18 of the combustible heat source 4, and when it passes through the combustible The central airflow channel 18 of the heat source 4 heats the air. When the user sucks on the cigarette holder 14, the cold air (indicated by the dashed arrows in Figs. 1a and 2) is also drawn into the aerosol of the cigarette 2 through the first air inlets 32 to form the base body 10. .

When the heated air sucked through the central airflow channel 18 of the combustible heat source 4 passes downstream of the aerosol-forming substrate 10 toward the mouthpiece 14 of the smoking article 2, the heated air heats the aerosol-forming substrate 10 by forced convection. The front part 10 a of the aerosol-forming substrate 10 is also heated by conduction through the adjacent back surface 8 of the combustible heat source 4 and the heat-conducting element 30.

The aerosol is heated by conduction and forced convection to form a matrix 10 to release glycerin and other volatile and semi-volatile compounds from the insert 20 of the homogeneous tobacco material. The compound released from the aerosol-forming substrate 10 forms an aerosol, wherein the aerosol is caused to pass through the The air sucked in by the central airflow channel 18 of the combustion heat source 4 and the air sucked into the aerosol-forming substrate 10 of the smoking article 2 through the first air inlets 32 are entrained in the air when passing through the aerosol-forming substrate 10 . The inhaled air and entrained aerosol (indicated by dashed arrows in Figures 1a) and 2 pass downstream through the conversion element 12, where they cool and condense. The cooled intake air and entrained aerosol are transmitted downstream to the user through the mouthpiece 14 and through the proximal end of the smoking article 2 according to the first embodiment of the present invention.

The smoking article 34 according to the second embodiment of the present invention shown in Figs. 1b) and 3 has most of the same structure as the smoking article 34 according to the first embodiment of the present invention shown in Figs. 1a) and 2. However, in the smoking article 34 according to the second embodiment of the present invention, the combustible heat source 4 and the aerosol-forming substrate 10 are separated from each other and located on the back surface 8 of the combustible heat source 4 and downstream of the aerosol-forming substrate 10 The one or more air inlets between the ends include one or more second air inlets 36 between the back surface 8 of the combustible heat source 4 and the aerosol-forming substrate 10.

As shown in FIG. 3, a second air inlet 36 is provided around the heat conducting element 30 and the overwrap 16 between the back surface 8 of the combustible heat source 4 and the upstream end of the aerosol-forming substrate 10. To allow cold air (indicated by dashed arrows in Figures 1b) and 3 to enter the space between the combustible heat source 4 and the aerosol-forming substrate 10.

In use, when the user sucks on the mouthpiece 14 of the smoking article 34 according to the second embodiment of the present invention, the air (indicated by the dashed arrow in FIG. 1b) and FIG. The central airflow channel 18 sucks the cigarette 34 and also passes cold air through the second intake air The mouth 36 draws in the space between the combustible heat source 4 and the aerosol-forming substrate 10.

When the heated air sucked through the central airflow channel 18 of the combustible heat source 4 passes downstream of the aerosol-forming substrate 10 toward the mouthpiece 14 of the cigarette 34, the heated air heats the aerosol-forming substrate 10 by convection. The front portion 10a of the aerosol-forming substrate 10 is also heated by conduction through the heat-conducting element 30.

The aerosol is heated to form a matrix 10 by conduction and convection to release glycerin and other volatile and semi-volatile compounds from the insert 20 of the homogeneous tobacco material. The compound released from the aerosol-forming substrate 10 forms an aerosol, in which the aerosol is sucked into the combustible heat source by the air sucked in through the central airflow channel 18 of the combustible heat source 4 and the second air inlet 36. The air in the space between the aerosol-forming substrate 10 and the aerosol-forming substrate 10 is entrained in the air when flowing through the aerosol-forming substrate 10. The inhaled air and entrained aerosol (indicated by dashed arrows in Fig. 1b) and 3 pass downstream through the conversion element 12, where they cool and condense. The cooled inhaled air and entrained aerosol are transmitted downstream to the user through the mouthpiece 14 and through the proximal end of the smoking article 34 according to the second embodiment of the present invention.

The smoking article (not shown) according to the third embodiment of the present invention has a structure substantially the same as that of the smoking article according to the second embodiment of the present invention shown in FIG. 1b) and FIG. However, in the smoking article according to the third embodiment of the present invention, the one or more air inlets located between the back of the combustible heat source and the downstream end of the aerosol-forming substrate include as shown in Fig. 1b) and 3 The smoking article according to the second embodiment of the present invention is shown in One or more second air inlets between the back surface of the combustible heat source 4 and the aerosol-forming substrate 10 and also includes a smoking article according to the first embodiment of the present invention as shown in Figs. 1a) and 2 The aerosol forms one or more first air inlets around the substrate.

In use, when a user draws on a cigarette holder of a smoking article according to the third embodiment of the present invention, air is drawn into the smoking article through a central airflow channel of the combustible heat source and cold air is also passed through the second The air intake port inhales the space between the combustible heat source and the aerosol-forming substrate and the aerosol-forming substrate inhaling the tobacco product through the first air intakes.

By omitting the second barrier coating layer containing clay, the combustible carbonaceous heat source used in the smoking articles according to the first, second and third embodiments of the present invention can be produced according to Example 1 below.

The air introduced into the smoking article through the central airflow channel of the combustible heat source and introduced through the aerosol-forming substrate of the smoking article according to the first, second and third embodiments of the present invention passes through the central airflow channel and the combustible One of the flammable parts of the heat source is in direct contact. The air introduced into the smoking article through the central airflow channel through the aerosol-forming substrate of the smoking article according to the first, second and third embodiments of the present invention is also in direct contact with the back surface of the combustible heat source.

The smoking article 38 according to the fourth embodiment of the present invention shown in FIG. 1c) has most of the same structure as the smoking article 38 according to the first embodiment of the present 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 wall 40 is provided between the back surface 8 of the combustible heat source 4 and the aerosol-forming substrate 10. As shown in FIG. 1c), the first barrier rib 40 includes a The non-combustible substantially air-impermeable first barrier coating on the entire back surface 8 of the combustion heat source 4 and the central airflow channel 18 of the combustible heat source 4 extend through the first barrier coating.

Due to the contents of the first barrier coating, the aerosol-forming substrate 10 of the smoking article 38 according to the fourth embodiment of the present invention is not in direct contact with the back surface 8 of the combustible carbonaceous heat source 4.

Due to the contents of the first barrier coating, in use, the air drawn through the central airflow channel 18 of the combustible heat source 4 through the cigarette 38 according to the fourth embodiment of the present invention does not directly contact the combustible The back surface 8 of the heat source 4. In addition, due to the contents of the first barrier coating, in use, the cold air of the aerosol-forming substrate 10 of the smoking article 38 according to the fourth embodiment of the present invention is introduced through the first air inlets 32. There is no direct contact with the back surface 8 of the combustible carbonaceous heat source 4.

However, the air introduced into the smoking article 38 through the central airflow passage 18 of the combustible heat source 4 and introduced through the aerosol-forming substrate 10 of the smoking article 38 according to the fourth embodiment of the present invention passes through the central airflow passage 18 and One of the combustible heat sources is in direct contact with the combustible portion.

The smoking article 42 according to the fifth embodiment of the present invention shown in FIG. 1d) has a structure substantially the same as that of the smoking article 42 according to the second embodiment of the present invention shown in FIGS. 1b) 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 wall 40 is provided between the back surface 8 of the combustible heat source 4 and the aerosol-forming substrate 10. As shown in Fig. 1d), the first barrier 40 includes a non-combustible substantially air-impermeable first barrier coating disposed on the entire back surface 8 of the combustible heat source 4 and a central airflow channel 18 of the combustible heat source 4 extends through the first A barrier coating.

Due to the contents of the first barrier coating, in use, the air introduced into the smoking article 42 according to the fifth embodiment of the present invention via the central airflow channel 18 of the combustible heat source 4 does not directly contact the combustible carbon-containing heat source 4 的 后 8。 4 of the back 8. In addition, due to the contents of the first barrier coating, in use, the combustible heat source 4 of the smoking article 42 according to the fifth embodiment of the present invention and the aerosol form a matrix through the second air inlets 36. The cold air in the 10 spaces does not directly contact the back surface 8 of the combustible carbonaceous heat source 4.

However, the air introduced into the smoking article 42 through the central airflow passage 18 of the combustible heat source 4 through the aerosol-forming substrate 10 of the smoking article 42 according to the fifth embodiment of the present invention passes through the central airflow passage 18 and One of the combustible heat sources is in direct contact with the combustible portion.

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

Due to the contents of the first barrier coating, in use, the air introduced into the 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 back surface of the combustible carbon-containing heat source. In addition, due to the contents of the first barrier coating, in use, the second air inlet according to the sixth embodiment of the present invention is introduced The space between the combustible heat source of the smoking article and the aerosol-forming substrate and the cold air introduced into the aerosol-forming substrate of the smoking article according to the sixth embodiment of the present invention through the first air inlets do not directly contact the combustible carbon The back of the heat source.

However, the air introduced into the smoking article through the central airflow channel of the flammable heat source and introduced through the aerosol-forming substrate of the smoking article according to the sixth embodiment of the present invention is combustible with one of the combustible heat sources when passing through the central airflow channel Partial direct contact.

A combustible carbon-containing heat source for a smoking article according to the fourth, fifth, and sixth embodiments of the present invention can be produced according to the following examples 2, 3, and 4.

The smoking article 44 according to the seventh embodiment of the present invention shown in FIG. 1e) has most of the same structure as the smoking article 44 according to the first embodiment of the present 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 and substantially air-impermeable second barrier 46 (shown in FIG. 1e) is provided between the combustible heat source 4 and the central airflow channel 18 by a dashed line. ). The second barrier rib 46 includes a non-combustible substantially air-impermeable second barrier rib coating disposed on the entire inner surface of the central airflow channel 18.

Due to the contents of the second barrier coating layer, in use, the air introduced into the smoking article 44 according to the seventh embodiment of the present invention through the central airflow channel 18 of the combustible heat source 4 when passing through the central airflow channel 18 There is no direct contact with a combustible part of the combustible carbonaceous heat source 4.

However, the smoking article according to the seventh embodiment of the invention enters the smoking article 44 through the central airflow passage 18 of the combustible heat source 4 The air introduced by the aerosol-forming substrate 10 of 44 is in direct contact with the back surface 8 of the combustible heat source 4.

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

Due to the contents of the second barrier coating layer, in use, the air introduced into the smoking article 48 according to the eighth embodiment of the present invention through the central airflow channel 18 of the combustible heat source 4 when passing through the central airflow channel 18 There is no direct contact with the combustible carbonaceous heat source 4.

However, the air introduced into the smoking article 48 through the central airflow channel 18 of the combustible heat source 4 through the aerosol-forming substrate 10 of the smoking article 48 according to the eighth embodiment of the present invention is directly connected to the back surface 8 of the combustible heat source 4 contact. In addition, the cold air sucked 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 via the second air inlets 36 is also connected to the back surface 8 of the combustible heat source 4 direct contact.

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

Due to the contents of the second barrier coating layer, in use, the air introduced into the smoking article according to the ninth embodiment of the present invention through the central airflow channel of the flammable heat source does not directly contact the airflow when passing through the central airflow channel. Combustible carbonaceous heat source.

However, the air introduced into the smoking article through the central airflow channel of the combustible heat source through the aerosol-forming substrate of the smoking article according to the ninth embodiment of the present invention is in direct contact with the back surface of the combustible heat source. In addition, the cold air sucked 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 inlets is also in direct contact with the back surface of the combustible heat source.

The combustible carbon-containing heat source used in the smoking article according to the seventh, eighth, and ninth embodiments of the present invention can be produced according to Example 1 below.

Example 1-Preparation of a combustible carbonaceous heat source including a second barrier coating of clay

A combustible cylindrical carbonaceous heat source for use in a smoking article according to the present invention can be prepared as described in WO-A2-2009 / 074870 A2 or any other conventional technique known to those of ordinary skill in the art. As described in WO-A2-2009 / 074870 A2, the aqueous slurry is extruded with a die having a central die hole with a circular cross section to manufacture the combustible heat source. The die hole has a diameter of 8.7 mm to form a cylindrical rod having a length between about 20 cm to about 22 cm and a diameter between about 9.1 cm to about 9.2 mm. A single longitudinal airflow channel is formed in the cylindrical rods by a mandrel mounted in the center of the die hole. The mandrel preferably has a circular cross section with an outer diameter of about 2 mm or about 3.5 mm. In another choice In the process, three mandrels with a circular cross section having an outer diameter of about 2 mm installed in the die holes at regular angles were used to form three air flow channels in the cylindrical rods. During the extrusion of the cylindrical rods, a clay-coated slurry (made of clay like natural green mud) is pumped through a supply channel extending through the mandrel or the center of the mandrels to A thin second barrier coating layer of about 150 microns to about 300 microns is formed on the inner surface of the air flow channel or the air flow channels. The cylindrical rods are dried at a temperature of about 20 ° C to about 25 ° C and a relative humidity of about 40% to about 50% for about 12 hours to about 72 hours, and then, pyrolyzed in a nitrogen environment at about 750 ° C for about 240 minute. After pyrolysis, the cylindrical rods are cut into a defined diameter using a grinding machine to form individual combustible carbon-containing heat sources. The cut and formed rod has a length of about 11 mm and a dry mass of about 400 mg in diameter and about 7.8 mm in diameter. The individual combustible carbon-containing heat sources were then dried at about 130 ° C for about 1 hour.

Example 2-Preparation of a combustible carbonaceous heat source including a first barrier coating of bentonite / kaolinite

A non-combustible substantially air-impermeable first barrier coating of pennite / kaolin is provided on the back of a combustible carbonaceous heat source prepared as described in Example 1, but a second barrier coating without clay is provided. The first barrier coating is provided by dipping, brushing or spraying. Impregnation involves inserting the back of the flammable carbonaceous heat source into a concentrated bentonite / kaolin solution. The bentonite / kaolin solution for impregnation contains 3.8% of bentonite, 12.5% of kaolin, and 83.7% of H ₂ O [m / m]. The back side of the combustible carbonaceous heat source was immersed in the pentonite / kaolin solution for about 1 second and the meniscus was allowed to disappear as the solution penetrated the carbon pores on the surface of the backside of the combustible carbonaceous heat source. Brushing involves immersing a brush in a concentrated bentonite / kaolin solution and applying the concentrated bentonite / kaolin solution on the brush to the surface of the backside of the combustible carbonaceous heat source until the surface is covered. The penten clay / kaolin solution used for brush coating contains 3.8% penten clay, 12.5% kaolin, and 83.7% H ₂ O [m / m].

After the non-combustible substantially air-impermeable first barrier coating is applied by dipping or brushing, the combustible carbon-containing heat source is dried in an oven at approximately 130 ° C for approximately 30 minutes and placed at approximately 5% relative humidity In the desiccator overnight.

The spraying comprises a suspension, which preferably comprises 3.6% clay, 18.0% kaolin and 78.4% H ₂ O [m / m], and is measured according to a rheometer (Physica MCR 300, coaxial cylinder configuration) , At a shear rate of about 100s ^-1 has about 50mPa. The viscosity of s. Sata MiniJet 3000 spray gun on a SMC E-MY2B linear actuator using 0.5mm, 0.8mm, or 1mm nozzles was sprayed at a speed of about 10 mm / s to about 100 mm / s. The following spraying parameters were used: distance sample-pistol 15 cm; sample velocity 10 mm / s; nozzle 0.5 mm; spray jet flat and spray pressure 2.5 bar. In the case of a single spray, a coating thickness of about 11 microns is usually obtained. Repeat spraying 3 times. During each spray, the combustible carbonaceous heat source was allowed to dry at room temperature for about 10 minutes. After the application of the non-combustible substantially air-impermeable first barrier coating, the combustible carbon-containing heat source is pyrolyzed at about 700 ° C. for about 1 hour.

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

A non-combustible, substantially air-impermeable first barrier coating of glass is provided on the back of a flammable carbon-containing heat source prepared as described in Example 1, but a second barrier coating of clay is not provided. The first barrier coating is provided by spraying. Glass spraying is performed using a suspension of finely ground frosted glass. For example, a glass frit (3 μm), 2.5% methylcellulose, and 60% water is used to have 120 mPa. s viscosity or 37.5% glass powder (3μm), 3.0% bentonite powder (bentonite powder) and 59.5% of water has 60 to 100mPa. s viscosity of spray suspension. A glass frit having a composition and physical characteristics corresponding to those of Tables 1, 2, 3, and 4 in Table 1 may be used.

Sata MiniJet 3000 spray gun on a SMC E-MY2B linear actuator using 0.5mm, 0.8mm, or 1mm nozzles was sprayed at a speed of about 10 mm / s to about 100 mm / s. The spraying is preferably repeated several times. After spraying is completed, the combustible carbonaceous heat source is pyrolyzed at about 700 ° C for about 1 hour.

Example 4-Preparation of a combustible carbonaceous heat source including a first barrier coating of aluminum

A non-combustible, substantially air-impermeable first barrier coating of aluminum was disposed on the back surface of the flammable carbon-containing heat source prepared as described in Example 1, but a second barrier coating of clay was not provided. The first barrier coating is provided by cutting an aluminum bobbin bands laser having a thickness of about 20 microns into an aluminum barrier. 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 flammable carbon-containing heat source of Example 1. In an alternative embodiment, the aluminum barrier has 3 holes positioned to align with the 3 air flow channels provided in the combustible carbonaceous heat source. The aluminum barrier coating is formed by attaching the aluminum barrier to the back of the combustible carbon-containing heat source using any suitable adhesive.

In use, the cold air sucked into the one or more air inlets located between the back of the combustible heat source and the downstream end of the aerosol-forming substrate is reduced during the user's puffing according to the first to the first The temperature of the aerosol forming the base 10 of the smoking articles 2, 34, 38, 42, 44, 48 of the ninth embodiment.

This advantageously prevents or suppresses the peak value of the temperature of the aerosol-forming substrate 10 during the user's puff and advantageously minimizes or reduces the user's puff profile. The smoke according to the first to ninth embodiments of the present invention Influence of the composition of mainstream aerosols of products 2, 34, 38, 42, 44, 48.

The specific embodiments described above are intended to describe the invention. However, other embodiments may be carried out without departing from the spirit and scope of the invention as defined by the claims, and it is understood that the specific embodiments described above are not intended to be limiting.

Claims (15)

A smoking article comprising: a flammable heat source having a relatively front and back side; one or more air flow channels extending from the front side of the flammable heat source to the back side of the flammable heat source; an aerosol-forming substrate, which Downstream of the back of the combustible heat source; a cigarette holder downstream of the aerosol-forming substrate; and one or more air inlets located downstream of the back of the combustible heat source and upstream of the cigarette holder, where one or More than one air inlet is located between the back of the combustible heat source and the downstream end of the aerosol-forming substrate, wherein in use, the air introduced through the aerosol-forming substrate passes through the one or more airflow channels and the one Or more than one air inlet enters the smoking article and at least some of the air introduced through the aerosol-forming substrate is in direct contact with a combustible portion of the combustible heat source, and during the puff of the user, the The cold air taken in by the one or more air inlets between the back surface and the downstream end of the aerosol-forming substrate reduces the Sol formation temperature of the substrate. The tobacco product according to claim 1, further comprising an outer package which is external to the aerosol-forming substrate and at least the rear of the combustible heat source. If the cigarette product of claim 1, further includes one of the following: (i) a non-combustible, substantially air-impermeable first barrier between the back surface of the combustible heat source and the aerosol-forming substrate and (ii) a non-combustible A substantially air-impermeable second barrier between the combustible heat source and the one or more airflow channels. The cigarette product of claim 1, including (i) a non-combustible, substantially air-impermeable first barrier between the back surface of the flammable heat source and the aerosol-forming substrate, wherein the first barrier includes a flammable gas barrier disposed on the combustible heat source. A first barrier coating on the back surface of the heat source. If the cigarette product of claim 1, includes (ii) a non-combustible, substantially air-impermeable second barrier between the combustible heat source and the one or more airflow channels, wherein the second barrier includes a A second barrier coating on the inner surface of more than one air flow channel. The smoking article according to any one of claims 1 to 5, wherein the one or more air inlets include one or more first air inlets around the aerosol-forming substrate. The smoking article according to any one of claims 1 to 5, wherein the aerosol-forming substrate abuts the back surface of the combustible heat source. The smoking article according to any one of claims 1 to 5, wherein the aerosol-forming substrate is separated from the back surface of the combustible heat source. The smoking article of claim 8, wherein the one or more air inlets include one or more second air inlets between the back surface of the combustible heat source and the aerosol-forming substrate. The smoking article according to any one of claims 1 to 5, 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. The smoking article according to any one of claims 1 to 5, wherein the aerosol-forming substrate comprises a tobacco-based material and at least one aerosol product. The tobacco product according to any one of claims 1 to 5, wherein the combustible heat source is a combustible carbonaceous heat source. The smoking article according to any one of claims 1 to 5, wherein the combustible heat source includes an ignition aid. The smoking article according to any one of claims 1 to 5, further comprising: a conversion element between the aerosol-forming substrate and the cigarette holder. The smoking article according to any one of claims 1 to 5, further comprising one or more aerosol modifiers, which are downstream of the aerosol-forming substrate.