TW201521608A - Smoking article with single radially-separated heat-conducting element - Google Patents

Abstract

A smoking article (2, 42) comprises: a combustible heat source (4) having opposed front (6) and rear (8) faces; an aerosol-forming substrate (10) downstream of the rear face (8) of the combustible heat source (4); and a single heat-conducting element (36) overlying a rear portion of the combustible heat source (4) and at least a front portion of the aerosol-forming substrate (10). The single heat-conducting element (36) comprises one or more layers of heat conductive material and the one or more layers of heat conductive material are radially separated from the combustible heat source (4) and the aerosol-forming substrate (10). The combustible heat source (4) is either a blind combustible heat source or the combustible heat source (4) is a non-blind combustible heat source and the smoking article (42) further comprises a non-combustible substantially air impermeable barrier (46) between the non-blind combustible heat source and one or more airflow channels (44) extending from the front face (6) to the rear face (8) of the non-blind combustible heat source. The single heat-conducting element comprises an outer layer of heat conductive material that is visible on the exterior of the smoking article.

Description

Smoke product with a single radial separation of thermally conductive elements

The invention relates to a smoking article comprising a combustible heat source having a front surface and a rear surface, an aerosol-forming substrate downstream of the rear surface of the combustible heat source, and a single heat-conducting element covering the single heat-conducting element A rear portion of the combustible heat source and at least a front portion of the aerosol-forming substrate.

Many tobacco products that are heated by tobacco rather than burned have been proposed in the art. One of the purposes of such "heating" smoking articles is to reduce the known harmful smoke components of this type produced by tobacco burning and pyrolytic degradation in conventional cigarettes. In one known type of heated smoking article, an aerosol is produced by heat transfer from a combustible heat source to an aerosol-forming substrate. The aerosol-forming substrate can be located within, downstream of, or surrounding the combustible heat source. During smoking, volatile compounds are thermally transferred from the flammable heat source to be released from the aerosol-forming substrate and entrained in the air that is drawn through the smoking article. As the released compounds cool, they condense to form an aerosol that is inhaled by the user. Typically, air is drawn into the known heated smoking article and passed through one or more gases disposed through the combustible heat source. The flow channel, and by forced heat convection and heat conduction, heat transfer occurs from the combustible heat source to the aerosol-forming substrate.

For example, a smoking article disclosed in WO-A2-2009/022232 comprises a combustible heat source, an aerosol-forming substrate downstream of the combustible heat source, and a heat-conducting element surrounding the combustible heat source and the aerosol. The adjacent front portions of the substrate are formed and in direct contact with them.

The thermally conductive element in the smoking article of WO-A2-2009/022232 transfers heat generated during combustion of the combustible heat source to the aerosol-forming substrate by heat conduction. In tobacco products that are heated rather than burned, the temperature reached in the aerosol-forming substrate has a significant effect on the ability to produce a sensory acceptable aerosol. It is often desirable to maintain the temperature of the aerosol-forming substrate within a specific range to optimize delivery of the aerosol to the user. In some cases, the radiant heat loss from the outer surface of the thermally conductive element surrounding and directly contacting the combustible heat source and the aerosol-forming substrate may cause the temperature of the combustible heat source and the aerosol-forming substrate to drop to a desired level. Outside the range, thereby affecting the performance of the smoking article. If the temperature of the aerosol-forming substrate is lowered too low, for example, it can have an adverse effect on the consistency and total amount delivered to the user's aerosol.

A smoking article disclosed in EP-A1-2 550 879 comprises: a multi-layered tubular member 9 comprising at least one metal layer and a paper layer; a carbon heat source 4 disposed at an end portion of the tubular member 9, at least partially directly Intimately contacting an inner surface of the tube member 9 and a smoke smell release source 8 disposed in the tube member 9 adjacent to the carbon heat source 4; and a holder portion 14 holding the carbon heat source 4 in direct contact with the tube The end portion and the carbon heat source 4 is held against the end portion.

In the embodiment shown in Fig. 1, the non-combustible wrapping material 9 is formed by joining the three-layer composite sheet 16 to the outside of the two-layer composite sheet 15. A portion of the three-layer composite sheet 16 protrudes from the two-layer composite sheet 15 to form the holder portion 14. As shown in FIG. 2, the two-layer composite sheet 15 comprises an inner aluminum layer 17 and an outer paper layer 18, and the three-layer composite sheet 16 comprises an inner paper layer 18, an intermediate aluminum layer 17, and an outer paper. Layer 18. The innermost layer of the non-combustible roll paper 9 is the aluminum layer 17 of the two-layer composite sheet 15, and the outermost layer of the non-combustible roll paper 9 is the outer paper layer 18 of the three-layer composite sheet 16.

In some heated smoking articles, in addition to heat transfer through a thermally conductive element, forced heat convection transfer from a combustible heat source to the aerosol-forming substrate is provided. For example, in some known heated smoking articles, one or more gas flow channels are disposed along the combustible heat source to provide forced heat convection heating of the aerosol-forming substrate. In such smoking articles, the aerosol-forming substrate is heated by a combination of heat conduction and forced heat convection heating.

For example, WO-A2-2009/022232 discloses providing at least one longitudinal gas flow passage through the combustible heat source to provide a controlled amount of forced heat convection heating of the aerosol-forming substrate.

In a known heated smoking article that primarily undergoes heat transfer from the combustible heat source to the aerosol-forming substrate by forced heat convection, the forced heat convection is transferred and thus the temperature in the aerosol-forming substrate According to the user's smoking behavior can be very different. As a result, the composition of the mainstream aerosol produced by such known heated smoking articles, and thus the organoleptic properties, may be undesirably highly sensitive to the user's suction method.

In particular, in known heated smoking articles comprising one or more airflow passages along the combustible heat source, between the intake air passing through the one or more airflow passages and the combustible heat source during suction by a user The direct contact causes activation of the combustion of the combustible heat source. Thus, a strong pumping process can initiate a sufficiently high forced heat convection transfer, causing the aerosol to form a spike in substrate temperature, adversely resulting in thermal decomposition of the aerosol-forming substrate and possibly even localized combustion. As used herein, the term "spike" is used to describe a transient increase in the temperature of the aerosol-forming substrate. As a result, the extent to which such known heated smoking articles produce unwanted thermal decomposition and combustion by-products in the mainstream aerosol, with the particular suction method employed by the user, is also disadvantageously significant.

In other heated smoking articles, no airflow passage is provided through the combustible heat source. In such heated smoking articles, the heating of the aerosol-forming substrate is primarily achieved by heat transfer through a thermally conductive element. In the heated smoking article in which the heating of the aerosol-forming substrate is mainly by heat conduction, the temperature of the aerosol-forming substrate may become more sensitive as the temperature of the thermally conductive element changes. This means that in such heated smoking articles, any cooling of the thermally conductive elements surrounding and directly contacting the combustible heat source and the aerosol-forming substrate due to radiant heat loss is also achieved by forming the substrate on the aerosol. Forced heat convection to heat the heated smoking article may have a greater impact on the aerosol production.

It is desirable to provide a heated smoking article comprising a combustible heat source having opposite front and rear surfaces, and an aerosol-forming substrate downstream of the rear surface of the combustible heat source, the aerosol-forming substrate providing improved smoking performance. In particular, it is desirable to provide a heated smoking article, The control of heating the aerosol-forming substrate is modified to help maintain the aerosol-forming substrate temperature within the desired temperature range during smoking.

According to the present invention, there is provided a smoking article comprising: a combustible heat source having opposite front and rear surfaces; an aerosol-forming substrate downstream of the rear surface of the combustible heat source; and a single heat conducting member covered by the single heat conducting member A rear portion of the combustible heat source and the aerosol form at least a front portion of the substrate. The single thermally conductive element comprises one or more layers of thermally conductive material and the one or more layers of thermally conductive material are radially separated from the combustible heat source and the aerosol-forming substrate. The combustible heat source is a non-through combustible heat source, or the combustible heat source is continuously passed through a combustible heat source, and the smoking article further comprises a substantially non-flammable gas barrier between the through combustible heat source and the one or more gas flow passages. The single thermally conductive element comprises an outer layer of thermally conductive material visible in the appearance of the article of smoking.

As used herein, the terms "remote", "upstream" and "front", and "proximal", "downstream" and "rear" are used to describe the smoking component or during the use of the smoking article. The relative position of a portion of the assembly relative to the direction of inhalation of the user on the smoking article. The smoking article according to the present invention comprises a proximal end through which an aerosol passes through the proximal end and is delivered to the user. The proximal end of the smoking article can also be referred to as the mouth end. In use, a user inhales on the proximal end of the smoking article to inhale the aerosol produced by the smoking article.

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

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

As used herein, the term "length" is used to describe the largest dimension of the longitudinal direction of the smoking article. That is, the largest dimension in the direction between the proximal end of the smoking article and the opposite distal end.

As used herein, the term "aerosol-forming substrate" is used to describe a release-producing substrate that, when heated, can form an aerosol. The aerosol produced from the aerosol-forming substrate of the smoking article according to the present invention may be visible or invisible and may comprise a vapor (eg, particulate matter in a gaseous state, which is typically liquid at room temperature or Solid) and droplets of gas and condensed vapor.

As used herein, the term "radial separation" is used to mean that one or more layers of thermally conductive material of the single thermally conductive element are separated from both the combustible heat source and the aerosol-forming substrate in a radial direction such that the single thermally conductive element is There is no direct contact between the one or more layers of thermally conductive material and the combustible heat source or the aerosol-forming substrate.

As used herein, the term "radial" is used to describe the vertical direction of the direction between the proximal end and the opposite end of the smoking article.

As used herein, the term "direct contact" is used to mean that the contact between two components is free of any intermediate material such that the surfaces of the components are in contact with each other.

The aerosol-forming substrate can be in the form of a plug or segment comprising a material that is capable of releasing a volatile compound. The substrate is surrounded by a roll of paper to form an aerosol. When an aerosol-forming substrate is in the form of such a plug or segment, the entire plug or section containing the web is considered to be the aerosol-forming substrate.

In such embodiments, one or more layers of thermally conductive material of the single thermally conductive element are radially separated from the web of the aerosol-forming substrate.

The smoking article according to the present invention comprises a single thermally conductive element covering a rear portion of the combustible heat source and at least a front portion of the aerosol-forming substrate. The single thermally conductive element comprises one or more layers of thermally conductive material and the one or more layers of thermally conductive material are radially separated from the combustible heat source and the aerosol-forming substrate.

The smoking article according to the present invention does not comprise any thermally conductive element additionally on or covering the single thermally conductive element. In particular, the smoking article according to the present invention does not comprise any thermally conductive elements that surround and directly contact one or both of the combustible heat source and the aerosol-forming substrate.

The smoking article according to the present invention may comprise a non-through combustible heat source or a continuous combustible heat source.

As used herein, the term "non-through" is used to describe a combustible heat source in which there is no gas flow path extending from the front surface of the combustible heat source to the rear surface.

In use, the intake air for inhalation by the user through the smoking article comprising a non-through combustible heat source according to the present invention does not pass through any of the airflow passages along the non-through combustible heat source. In a smoking article comprising a non-through combustible heat source according to the present invention, heating of the aerosol-forming substrate occurs primarily by heat conduction, and heating of the aerosol-forming substrate by forced heat convection is minimized or cut back.

As used herein, the term "airflow passage" is used to describe a passage extending along the length of a combustible heat source through which air drawn by a user can be drawn downstream.

As used herein, the term "straight through" is used to describe a combustible heat source having one or more gas flow passages extending from the front surface of the combustible heat source to the rear surface.

In use, the intake air for inhalation by a user through a smoking article comprising a non-through combustible heat source according to the present invention passes through one or more airflow passages along the through-combustible heat source. In a smoking article comprising an all-combustible heat source according to the present invention, heating of the aerosol-forming substrate occurs by heat conduction and forced heat convection.

A smoking article comprising an all-combustible heat source according to the present invention further comprising a substantially non-flammable gas impermeable between the through-combustible heat source and the one or more gas flow passages extending from the front surface of the through-combustible heat source to the rear surface barrier.

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

In the case where the smoking article according to the present invention contains a continuous combustible heat source, any air flow passage through the non-through combustible heat source is absent, and during combustion by the user, the combustion activation of the non-through combustible heat source is advantageously substantially prevented or suppressed.

Similarly, when the smoking article according to the present invention comprises a continuous flammable heat source, the through-combustible heat source and the one or more airflow passages extending from the front surface of the through-combustible heat source to the rear surface are substantially non-flammable. The gas permeable barrier advantageously substantially prevents or inhibits combustion activation of the through-combustible heat source during user suction.

The combustion activation of the combustible heat source is prevented or suppressed during the user's pumping, advantageously substantially preventing or suppressing the peak of the aerosol-forming substrate temperature of the smoking article according to the present invention.

The aerosol-forming substrate of the smoking article according to the present invention is subjected to a strong suction method by preventing or suppressing combustion activation of the combustible heat source and also preventing or suppressing an increased temperature exceeding in the aerosol-forming substrate. Combustion or thermal decomposition can advantageously be avoided. Additionally, the effect of the user suction method on the mainstream aerosol composition of the smoking article according to the present invention may advantageously be minimized or reduced.

The single thermally conductive element covers a rear portion of the combustible heat source and at least a front portion of the aerosol-forming substrate.

One or more layers of thermally conductive material of the single thermally conductive element are radially separated from the combustible heat source and the aerosol-forming substrate. This limits the transfer of heat from the combustible heat source to and from the single thermally conductive element to the aerosol-forming substrate. In use, this advantageously helps to maintain the aerosol-forming substrate of the smoking article according to the invention The temperature obtained is lower than the temperature at which the aerosol-forming substrate may be burned or thermally decomposed.

Preferably, the heat transfer system thermally conducted from the combustible heat source to the single thermally conductive element is substantially reduced. This results in the single thermally conductive element of the smoking article according to the present invention having a thermal conductivity of a known heated smoking article that surrounds and directly contacts the rear portion of the combustible heat source and at least a front portion of the aerosol-forming substrate. The component is kept at a lower temperature.

In the heated smoking article of the heat-conducting element surrounding and directly contacting the combustible heat source and the at least a front portion of the aerosol-forming substrate, the heat consumption generated by the heat-conducting transfer via the heat-conducting element significantly causes the combustible heat source to thereafter Part of the temperature is lowered. This will shorten the combustion life of the combustible heat source and can result in unacceptable aerosol transport.

According to the smoking article of the present invention, the radial separation between the one or more layers of the thermally conductive material of the single thermally conductive element and the combustible heat source and the aerosol-forming substrate advantageously reduces heat dissipation by heat transfer through the thermally conductive element .

The single thermally conductive element advantageously reduces heat loss from the combustible heat source. During the smoking of the smoking article, one or more layers of the thermally conductive material of the single thermally conductive element increase in temperature when heat is generated by the combustible heat source. The temperature of one or more layers of the thermally conductive material of the single thermally conductive element is increased to reduce the temperature differential between the combustible heat source and the cover assembly of the smoking article such that heat loss from the combustible heat source can be reduced.

By reducing heat loss from the combustible heat source, the single thermally conductive element advantageously helps maintain the temperature of the aerosol-forming substrate within a desired temperature range. This improves the aerosol generated from the aerosol-forming substrate.

One or more layers of thermally conductive material of the single thermally conductive element conduct heat along the smoking article. This improves the efficiency of heat transfer from the combustible heat source to the aerosol-forming substrate and thus improves the heating of the aerosol-forming substrate. Improvements in heat transfer transmission are obtained by the inclusion of the single thermally conductive element, particularly advantageous in accordance with the present invention comprising a non-through combustible heat source wherein there is substantially no forced heat convection.

Radial separation between one or more layers of thermally conductive material of the single thermally conductive element and the combustible heat source and the aerosol-forming substrate, preferably taken through one or more layers containing one or more thermally conductive elements in the single thermally conductive element An intermediate layer material between the material and the combustible heat source and the aerosol-forming substrate. The one or more intermediate layer materials can be disposed over the entire area of the combustible heat source and the aerosol-forming substrate. Alternatively, the one or more interlayer materials may be provided with only a portion or a portion of this region. In some embodiments, the one or more interlayer materials may extend over one or more layers of the thermally conductive material of the single thermally conductive element in one or both of the upstream and downstream directions.

Preferably, the one or more layers of thermally conductive material of the single thermally conductive element are radially separated from the combustible heat source and the aerosol-forming substrate by one or more layers of insulating material. Suitable insulating materials include, but are not limited to, paper, ceramic, and metal oxides.

For example, in some preferred embodiments of the present invention, the combustible heat source rear portion covered by the single heat conducting member and the aerosol forming substrate at least a front portion are covered by a paper roll along the cigarette At least a portion of the length of the article surrounds the smoking article. In such embodiments, the paper roll links the single thermally conductive element to the combustible heat source and the aerosol-forming substrate The separation is such that there is no direct contact between the single thermally conductive element and the combustible heat source or the aerosol-forming substrate.

The single thermally conductive element includes an outer layer of thermally conductive material disposed on an outer side of the article such that an outer layer of thermally conductive material of the single thermally conductive element is visible on the article.

In some embodiments, one or more layers of thermally conductive material of the single thermally conductive element are radially separated from the combustible heat source and the aerosol-forming substrate by a roll of paper extending along all or only a portion of the article. In such embodiments, the web of paper wraps around the smoking article, over the combustible heat source and the aerosol-forming substrate, and the single thermally conductive element is disposed to cover at least a portion of the web.

The arrangement of the single thermally conductive element covering one of the tobacco sheets of the smoking article provides benefits relative to the appearance of the smoking article according to the present invention, particularly during and after smoking. In some cases, when the web is heated from the combustible heat source, some discoloration of the web in the combustible heat source region can be observed. The migration of volatile compounds from the aerosol-forming substrate to the web surrounding the aerosol-forming substrate and downstream of the aerosol-forming substrate can result in additional discoloration of the web. In some embodiments, the single thermally conductive element of the smoking article according to the present invention may be disposed on the roll of paper surrounding at least a rear portion of the combustible heat source and the aerosol-forming substrate, such that the roll of paper The discoloration is covered and is no longer visible or less common, and in certain embodiments, the single thermally conductive element can extend around the entire length of the aerosol-forming substrate. In certain preferred embodiments, the single thermally conductive element can extend downstream of the aerosol-forming substrate. Therefore, the initial appearance of the smoking article can be retained during smoking.

Alternatively or additionally one or more layers of thermal insulation between the one or more layers of thermally conductive material of the single thermally conductive element and the combustible heat source and the aerosol-forming substrate, at least a portion of the single thermally conductive element may be interconnected by an air gap The combustible heat source and the aerosol-forming substrate are radially separated. An air gap may be provided through the isolation element comprising one or more layers of thermally conductive material between the one or more layers of the thermally conductive element and the combustible heat source and the aerosol-forming substrate to be coupled to the combustible heat source A defined interval is maintained between the aerosol-forming substrate. The one or more spacer elements can be, for example, one or more strips that radially surround the combustible heat source and the aerosol-forming substrate.

Preferably, one or more layers of thermally conductive material of the single thermally conductive element are radially separated from the combustible heat source and the aerosol-forming substrate by at least 20 microns, more preferably by at least 50 microns. In certain embodiments, one or more layers of thermally conductive material of the single thermally conductive element are radially separated from the combustible heat source and the aerosol-forming substrate by at least 75 microns or more, or at least 100 microns.

When one or more layers of insulating material are disposed between the one or more layers of thermally conductive material of the single thermally conductive element and the combustible heat source and the aerosol-forming substrate, as described above, one or more layers of thermally conductive material of the single thermally conductive element are The radial separation between the combustible heat source and the aerosol-forming substrate is determined by the thickness of the one or more layers of insulating material.

The one or more layers of thermally conductive material of the single thermally conductive element can comprise any suitable thermally conductive material or combination of materials having suitable thermal conductivity.

Preferably, when measured using a Modified Transient Plane Source (MTPS) method, at 23 ° C and At 50% relative humidity, the one or more layers of thermally conductive material of the single thermally conductive element comprise an overall thermal conductivity of about 10 watts per metre Kelvin (W/(M‧K)) and about 500 watts per metre of Kelvin ( Thermally conductive material between W/(M‧K)), preferably at approximately 15 watts per metre Kelvin (W/(M‧K)) and approximately 400 watts per metre Kelvin (W/(M‧ K)) between. Suitable thermally conductive materials include, but are not limited to, metal foil rolls such as, for example, aluminum foil roll paper, steel roll paper, iron foil roll paper, and copper foil roll paper; and metal alloy foil roll paper.

In certain preferred embodiments, the single thermally conductive element comprises one or more layers of aluminum.

Preferably, the one or more layers of thermally conductive material of the single thermally conductive element comprise a heat reflective material such as aluminum or steel. In such embodiments, in use, the single thermally conductive element advantageously reflects thermal radiation from the combustible heat source and the aerosol-forming substrate back to the combustible heat source and the aerosol-forming substrate.

As used herein, the term "heat reflective material" means a material having a relatively high thermal reflectivity and a relatively low thermal emission such that a greater portion of incident radiation is reflected from the surface of the material than the thermal emission of the material. . Preferably, the heat reflective material reflects more than 50% of the incident radiation, more preferably more than 70% of the incident radiation, and optimally more than 75% of the incident radiation.

In such embodiments, the relatively high thermal reflectivity and relatively low thermal emission of the single thermally conductive element can reduce heat loss from the combustible heat source and the aerosol-forming substrate.

Thermal reflection of one or more layers of thermally conductive material of the single thermally conductive element can be improved by providing one or more layers of thermally conductive material having the single thermally conductive element having a shiny inner surface facing the combustible heat source and the reflected gas The sol forms the surface of the substrate.

The single thermally conductive element can be in the form of a single layer of thermally conductive material. Alternatively, the single thermally conductive element can be in the form of a multilayer or conforming material comprising at least one layer of thermally conductive material in combination with one or more layers of other thermally or non-conductive layers. In such embodiments, the at least one layer of thermally conductive material can comprise any of the thermally conductive materials listed above.

In certain preferred embodiments, the single thermally conductive element can be in the form of a conforming material comprising at least one layer of thermally conductive material and at least one layer of insulating material. In such embodiments, the inner layer of the single thermally conductive element facing the combustible heat source and the aerosol-forming substrate can be a layer of insulating material. In this manner, the inner layer of insulating material provides the desired radial separation between at least one layer of the single thermally conductive element and the thermally conductive material of the combustible heat source and the aerosol-forming substrate.

In certain preferred embodiments, the single thermally conductive element comprises a single layer of thermally conductive material.

In certain preferred embodiments, the single thermally conductive element is a conforming material comprising a single layer of thermally conductive material and one or more layers of insulating material. In some particularly preferred embodiments, the single thermally conductive element is a conforming material comprising a single layer of thermally conductive material and a single layer of thermally insulating material. Preferably, the single thermally conductive element is a conforming material comprising an outer layer of a single thermally conductive material and a single inner layer of insulating material.

An example of a suitable bonding material that is particularly suitable for forming the single thermally conductive element is a two-layer conforming material comprising an outer layer of aluminum and an inner layer of paper.

It is particularly advantageous to use a single thermally conductive element comprising a conforming material during the production of the smoking article according to the invention, since the at least one insulating layer provides additional strength and rigidity. This makes the bonding material easier to process, reducing the risk of collapse or breakage of the at least one thermally conductive layer, which may be relatively thin and fragile.

Preferably, the single thermally conductive element has a thickness between about 5 microns and about 100 microns, more preferably between about 5 microns and about 80 microns.

Preferably, the single thermally conductive element comprises one or more layers of thermally conductive material having a thickness between about 2 microns and about 50 microns, more preferably between about 4 microns and about 30 microns.

In certain embodiments, the single thermally conductive element can comprise an aluminum foil having a thickness of about 20 microns.

In certain preferred embodiments, the single thermally conductive element can comprise a conforming material comprising an outer layer of aluminum having a thickness between about 5 microns and about 6 microns and an inner layer of paper.

As described above, the single thermally conductive element of the smoking article according to the present invention covers a rear portion of the combustible heat source and at least a front portion of the aerosol-forming substrate.

To control the heating of the aerosol-forming substrate during smoking, the position and extent of the single thermally conductive element relative to the combustible heat source and the aerosol-forming substrate can be adjusted. In particular, in order to adjust the aerosol transport profile of the smoking article, the single can be adjusted in the upstream and downstream directions The extent of the thermally conductive element relative to the combustible heat source and the aerosol-forming substrate.

The single thermally conductive element can extend around all or a portion of the circumference of the smoking article. Preferably, the single thermally conductive element forms a continuous sleeve that surrounds the smoking article along a portion of the length of the smoking article.

Preferably, the length of the rear portion of the combustible heat source covered by the single thermally conductive element is between about 2 mm and about 8 mm, more preferably between about 3 mm and about 5 mm.

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

In certain embodiments, the single thermally conductive element covers the entire length of the aerosol-forming substrate. In such embodiments, the downstream end of the single thermally conductive element can be aligned with the downstream end of the aerosol-forming substrate. Alternatively, the single thermally conductive element can extend beyond the aerosol-forming substrate in a downstream direction.

In other embodiments, the single thermally conductive element covers only a front portion of the aerosol-forming substrate. In such embodiments, the aerosol-forming substrate extends beyond the single thermally conductive element in a downstream direction.

In embodiments where the single thermally conductive element covers only a portion of the front portion of the aerosol-forming substrate, the aerosol-forming substrate can extend at least about 3 millimeters in the downstream direction beyond the single thermally conductive element. For example, the aerosol-forming substrate can extend in the downstream direction beyond the single thermally conductive element by between about 3 mm and about 10 mm. Alternatively, the aerosol-forming substrate can extend in the downstream direction beyond the single thermally conductive element by less than 3 mm.

In embodiments where the single thermally conductive element covers only a front portion of the aerosol-forming substrate, the aerosol-forming substrate front portion may be between about 1 mm and about 10 mm in length. . For example, the length of the front portion of the aerosol-forming substrate covered by the single thermally conductive element can be between about 2 mm and about 8 mm, or between about 2 mm and about 6 mm.

The smoking article according to the present invention may comprise a non-through combustible heat source.

It is known to include an additive in the combustible heat source of the heated smoking article to improve the ignition and combustion properties of the combustible heat source. However, the additive containing ignition and combustion may cause thermal decomposition and reactants which may be detrimental to the inhaled air entering through such known heated smoking articles during use of the heated smoking article.

During use of the smoking article according to the present invention, the inclusion of a non-through combustible heat source can advantageously substantially prevent or inhibit combustion and heat as the inhaled air enters through the smoking article to ignite and combust a non-through combustible heat source. Decomposes the formed products and other substances. This is particularly advantageous when the non-through combustible heat source contains one or more additives to assist in the ignition or combustion of the non-through combustible heat source.

In a smoking article comprising a non-through combustible heat source according to the present invention, it is particularly important to optimize the transfer of heat transfer between the combustible heat source and the aerosol-forming substrate. A single thermally conductive element containing a radial separation from the combustible heat source and the aerosol-forming substrate, if heated by the aerosol-forming substrate by any small amount of forced heat convection, has been considered to include a non-through heat source The smoking performance of the smoking article has a particularly advantageous effect.

It should be understood that the smoking article according to the present invention may comprise a non-through combustible heat source comprising one or more enclosed or blocked passages through which air cannot be drawn for inhalation by a user.

For example, a smoking article according to the present invention may comprise a non-through combustible heat source comprising one or more lengths along the length of the non-through combustible heat source extending only from the front surface at the upstream end of the non-through combustible heat source Closed channel.

The inclusion of one or more enclosed air passages increases the surface area of the non-through combustible heat source exposed to oxygen in the air and can advantageously promote ignition and continued combustion of the non-through combustible heat source.

Alternatively, the smoking article according to the present invention may comprise an all-pass combustible heat source having one or more gas flow passages extending from the front surface of the through-combustible heat source to the rear surface.

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

As used herein, the term "closed" is used to describe an airflow passage that extends through the interior of the through-combustible heat source and is surrounded by the through-combustible heat source.

Alternatively or additionally, the one or more airflow channels may comprise one or more non-closed airflow channels. For example, the one or more airflow passages may include one or more grooves or other non-closed airflow passages extending along the outside of the through-combustible heat source.

The one or more airflow channels may include one or more enclosed airflow channels, or one or more non-closed airflow channels, or a combination of these channels.

In certain embodiments, the smoking article according to the present invention comprises one, two, or three airflow passages extending from the front surface of the through-combustible heat source to the rear surface.

In certain preferred embodiments, the smoking article according to the present invention comprises a single airflow passage extending from the front surface of the through-combustible heat source to the rear surface.

In certain particularly preferred embodiments, the smoking article according to the present invention comprises a single substantially central or axial airflow passage extending from the front surface of the through-combustible heat source to the rear surface.

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

It should be understood that the smoking article according to the present invention may comprise a through-combustible heat source comprising one or more, in addition to one or more air intake passages for the user to draw air through which the air is drawn. The passage is closed or blocked and air cannot be drawn through the passages for inhalation by the user.

For example, a smoking article according to the present invention may comprise a through-combustible heat source comprising one or more gas flow passages extending from a front surface to a rear surface of the combustible heat source, and one or more along the length of the combustible heat source, only A closed passage extending a portion of the path from the surface prior to the passage of the combustible heat source.

The inclusion of one or more enclosed air passages increases the surface area of the through-combustible heat source exposed to oxygen in the air and can advantageously promote ignition and continued combustion of the through-combustible heat source.

The smoking article according to the present invention comprises a continuous combustible heat source, the smoking article further comprising a substantially non-flammable gas impermeable barrier at the through-combustible heat source and the one or more from the through-combustible heat source The front surface extends between the air flow passages of the rear surface.

Having a substantially non-flammable, gas-impermeable barrier between the through-combustible heat source and the one or more gas flow passages extending from the front surface of the through-combustible heat source to the rear surface, the intake air passing through the one or more gas flow passages Products and other materials formed by combustion and thermal decomposition may advantageously be substantially prevented or inhibited during the ignition and combustion of the combustible heat source from the inhaled air entering the article through one or more gas flow passages. This is particularly advantageous when the through-combustible heat source contains one or more additives to aid in the ignition or combustion of the through-combustible heat source.

The barrier between the through-combustible heat source and the one or more airflow passages may be attached or otherwise attached to the through-combustible heat source.

In certain preferred embodiments, the barrier comprises a substantially non-flammable, gas impermeable barrier coating disposed on the inner surface of the one or more gas flow passages. In such embodiments, preferably the barrier comprises a barrier providing a coating on at least substantially the entire inner surface of the one or more gas flow channels, and more preferably the barrier comprises a gas flow channel in the one or more A barrier to the coating is provided on the entire inner surface.

As used herein, the term "coating" is used to describe a layer of material that covers and adheres to the combustible heat source.

In other embodiments, the barrier coating can be disposed by inserting a liner into the one or more airflow passages. For example, in the one When the plurality of airflow passages comprise one or more closed airflow passages extending through the interior of the through-combustible heat source, a substantially non-flammable gas-tight hollow tube can be inserted into each of the one or more airflow passages.

The barrier may have a low thermal conductivity or a high thermal conductivity depending on the characteristics and properties required of the smoking article. Preferably, the barrier has a low thermal conductivity.

The barrier thickness can be appropriately adjusted to achieve good smoking performance. In certain embodiments, the barrier thickness can be between about 30 microns and about 200 microns. In a preferred embodiment, the barrier thickness is between about 30 microns and about 100 microns.

The barrier may be formed from one or more suitable materials that are substantially thermally stable and non-flammable at temperatures reached by the through combustible heat source during ignition and combustion. Suitable materials are known in the art and include, but are not limited to, for example: clay; metal oxides such as iron oxide, aluminum oxide, titanium dioxide, cerium oxide, cerium oxide-alumina, zirconia, And cerium oxide; zeolite; zirconium phosphate; and other ceramic materials or combinations thereof.

Preferably, the barrier material can be formed from the group consisting of clay, glass, aluminum, iron oxide, and combinations thereof. If desired, catalytic components, such as those that promote the oxidation of carbon monoxide to carbon dioxide, can be incorporated into the barrier. Suitable catalytic components include, but are not limited to, for example, platinum, palladium, transition metals, and oxides thereof.

When the barrier comprises a barrier providing a coating on the inner surface of the one or more gas flow channels, the barrier coating may be applied to the inner surface of the one or more gas flow channels by any suitable means, such as The method described in US-A-5,040,551. For example, the inner surface of the one or more gas flow channels may be sprayed, wetted, or coated with a barrier coating solution or suspension. In certain preferred embodiments, when the combustible heat source is extruded, the barrier coating is applied to the inner surface of the one or more gas flow passages by the procedure described in WO-A2-2009/074870.

The smoking article according to the present invention may further comprise a substantially non-flammable, gas impermeable barrier between the rear surface of the combustible heat source and the aerosol-forming substrate.

Where the smoking article according to the present invention comprises a continuous flammable heat source and a substantially non-combustible gas barrier between the surface of the flammable heat source and the aerosol-forming substrate, the barrier should allow air to enter the smoking article, The one or more gas flow passages extending from the front surface of the through-combustible heat source to the rear surface are sucked downstream and passed through the smoking article.

The barrier may abut one or both of the combustible heat source back surface and the aerosol-forming substrate. Alternatively, the barrier may be separated from one or both of the combustible heat source back surface and the aerosol-forming substrate.

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

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

The barrier may advantageously limit the temperature at which the aerosol-forming substrate is exposed during ignition and combustion of the combustible heat source, such that the smoking article Helps avoid or reduce thermal decomposition or combustion of the aerosol-forming substrate during use. This is particularly advantageous when the combustible heat source contains one or more additives to assist in igniting the combustible heat source.

To facilitate aerosol formation, the aerosol-forming substrate that heats the smoking article typically comprises a polyol, such as glycerin, or other known aerosol formers. Such aerosol formers can migrate from the aerosol-forming substrate of the known heated smoking article to the combustible heat source of the smoking article during storage and smoking. The migration of the aerosol former to the combustible heat source of the known heated smoking article can disadvantageously result in thermal decomposition of the aerosol former, particularly during smoking of the heated smoking article.

a substantially non-flammable, gas-impermeable barrier between the rear surface of the combustible heat source and the aerosol-forming substrate comprising the smoking article according to the present invention, which may advantageously be substantially prevented or inhibited during storage of the smoking article The components of the sol-forming substrate migrate to the combustible heat source.

Alternatively or additionally, a substantially non-flammable, gas-impermeable barrier between the rear surface of the combustible heat source and the aerosol-forming substrate comprising the smoking article according to the present invention may advantageously be substantially during use of the smoking article The component that prevents or inhibits the aerosol-forming substrate from migrating to the combustible heat source.

The inclusion of a substantially non-flammable, gas impermeable barrier between the surface of the combustible heat source and the aerosol-forming substrate is particularly advantageous when the aerosol-forming substrate comprises at least one aerosol former.

In such embodiments, a substantially non-flammable, gas-impermeable barrier between the rear surface of the combustible heat source and the aerosol-forming substrate is contained in the smoking article according to the present invention, during storage and use of the smoking article. Have Advantageously, substantially at least one aerosol former is prevented or inhibited from migrating from the aerosol-forming substrate to the combustible heat source. During the use of the smoking article, the thermal decomposition of the at least one aerosol former can thus advantageously be substantially avoided or reduced.

The substantially non-flammable, gas-impermeable barrier between the rear surface of the combustible heat source and the aerosol-forming substrate may have a low thermal conductivity or a high thermal conductivity depending on the characteristics and properties desired for the smoking article. In certain embodiments, the material forming the barrier may have an overall thermal conductivity of about 0.1 watts per meter Kelvin at 23 ° C and 50% relative humidity when measured using a modified transient planar heat source (MTPS) method. (Kelvin) (W/(M‧K)) and approximately 200 watts per metre Kelvin (W/(M‧K)).

The barrier thickness can be appropriately adjusted to achieve good smoking performance. In certain embodiments, the barrier thickness can be between about 10 microns and about 500 microns.

The barrier may be formed from one or more suitable materials that are substantially thermally stable and non-flammable at temperatures 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 (e.g., bentonite and kaolin), glass, minerals, ceramic materials, resins, metals, and combinations thereof.

Preferably, the barrier material can be formed from a mixture comprising clay and glass, and more preferably the barrier material can be formed from the group consisting of copper, aluminum, stainless steel, alloys, alumina (Al ₂ O ₃ ), resins, and mineral gums.

In certain preferred embodiments, the barrier comprises a clay coating comprising a 50/50 blend of bentonite and kaolin disposed on the back surface of the combustible heat source. In other preferred embodiments, the barrier comprises a glass coating disposed on the rear surface of the combustible heat source, more preferably a sintered glass coating.

In some particularly preferred embodiments, the barrier comprises an aluminum coating on the rear surface of the combustible heat source.

Preferably, the barrier thickness is at least about 10 microns.

Due to the slight gas permeability of the clay to the air, in embodiments, where the barrier comprises a clay coating disposed on the rear surface of the combustible heat source, preferably the clay coating has a thickness of at least about 50 microns, and optimally Between approximately 50 microns and approximately 350 microns.

In embodiments, when the barrier is formed from one or more more gas impermeable materials, such as aluminum, the barrier may be thinner, and typically preferably has a thickness of less than about 100 microns, and more preferably about 20 microns.

In an embodiment, preferably the glass coating has a thickness of less than about 200 microns when the barrier comprises a glass coating disposed on the rear surface of the combustible heat source.

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

When the barrier comprises a barrier coating disposed on the rear surface of the combustible heat source, the barrier coating can be applied to cover and adhere to the rear surface of the combustible heat source by any suitable method known in the art, including , but not limited to, spraying, vapor deposition, dipping, wood Material transfer (eg, brushing or gluing), electrostatic deposition, or any combination thereof.

For example, the barrier coating may be formed by pre-forming a barrier of a size and shape approximating the rear surface of the combustible heat source and applying it to the rear surface of the combustible heat source to cover and adhere to at least substantially the entire rear surface of the combustible heat source. . Alternatively, the barrier coating can be cut or otherwise processed after it is applied to the back surface of the combustible heat source. In a preferred embodiment, the aluminum foil is applied to the back surface of the combustible heat source by gluing or pressing the aluminum foil to the combustible heat source, and then cut or otherwise processed to cover and adhere the aluminum foil to at least the essence of the combustible heat source. The entire rear surface above, preferably, covers and adheres to the entire rear surface of the combustible heat source.

In another preferred embodiment, the barrier coating is formed by applying a solution or suspension of one or more suitable coating materials to the back surface of the combustible heat source. For example, the flammable heat source may be impregnated with a solution or suspension of one or more suitable coating materials, or by spraying or spraying a solution or suspension of one or more suitable coating materials. The barrier coating can be applied to the rear surface of the combustible heat source by electrostatically depositing a powder or powder mixture of one or more suitable coating materials onto the rear surface of the heat source. When electrostatically depositing a powder or powder mixture of one or more suitable coating materials onto the back surface of the combustible heat source, applying the barrier coating to the back surface of the combustible heat source, preferably prior to electrostatic deposition, The surface of the combustible heat source is previously treated with water glass. Preferably, the barrier coating is applied by spraying.

The barrier coating can be formed by a single solution or suspension of one or more suitable coating materials applied to the back surface of the combustible heat source. Alternatively, the barrier coating can be formed by multiple application of a solution or suspension of one or more suitable coating materials to the back surface of the combustible heat source. For example, the barrier coating can be formed by applying a solution or suspension of one or more suitable coating materials one, two, three, four, five, six, seven, or eight consecutive applications to the back surface of the combustible heat source.

Preferably, the barrier coating is formed by applying a solution or suspension of one or more suitable coating materials to the back surface of the combustible heat source between one and ten times.

After a solution or suspension of one or more suitable coating materials is applied to the back surface of the combustible heat source, the combustible heat source can be dried to form the barrier coating.

When the barrier coating is formed by applying a solution or suspension of one or more suitable coating materials to the surface of the combustible heat source multiple times, it is necessary to dry the combustible heat source between successive application of the solution or suspension. .

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

The smoking article according to the present invention may comprise one or more first air inlets surrounding the periphery of the aerosol-forming substrate.

As used herein, the term "air intake" is used to describe a hole, slit, slot, or other opening through which air can be drawn into the article of smoke.

A smoking article according to the present invention comprising one or more first air inlets surrounding a periphery of the aerosol-forming substrate, and in use, cool air passes through the first air inlets and is drawn into the smoking article The aerosol forms a substrate. Passing through the first air inlets, the air sucked into the aerosol-forming substrate passes through the aerosol product from the aerosol-forming substrate and passes through the proximal end of the smoking article, leaving the smoking article .

The inhalation of cool air through one or more first air inlets around the periphery of the aerosol-forming substrate during suction by the user advantageously reduces the temperature of the aerosol-forming substrate. This advantageously substantially prevents or inhibits the spike of the aerosol-forming substrate temperature during user aspiration.

As used herein, the term "cool air" is used to describe ambient air that is not significantly heated by the combustible heat source when the user is pumping.

By preventing or suppressing the peak of the aerosol-forming substrate temperature, containing one or more first air inlets surrounding the aerosol-forming substrate periphery, advantageously assisting in avoiding or reducing the gas under intense suction The sol forms a combustion or thermal decomposition of the substrate. Additionally, the inclusion of one or more first air inlets around the periphery of the aerosol-forming substrate advantageously helps minimize or reduce the effects of user suction on the composition of the mainstream aerosol of the smoking article.

In certain preferred embodiments, the one or more first inlet ports are positioned adjacent the downstream end of the aerosol-forming substrate.

In certain embodiments, the aerosol-forming substrate can abut the back surface of the combustible heat source.

As used herein, the term "adjacent" is used to describe that the aerosol-forming substrate is in direct contact with the surface of the combustible heat source or a substantially non-flammable, gas-impermeable barrier coating disposed on the back surface of the combustible heat source.

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

As used herein, the term "separating" is used to describe that the aerosol-forming substrate is not in direct contact with the flammable heat source back surface or a substantially non-flammable gas barrier coating disposed on the back surface of the combustible heat source.

Alternatively or in addition to one or more first air inlets, in such embodiments, the smoking article according to the present invention may comprise one or more between the rear surface of the combustible heat source and the aerosol-forming substrate Two air inlets. In use, cool air passes through the second air inlet and is drawn into the space between the combustible heat source and the aerosol-forming substrate. Passing through the second air inlet, the intake air taken into the space between the combustible heat source and the aerosol-forming substrate, passing through the space between the combustible heat source and the aerosol-forming substrate A smoking article that passes through the proximal end of the smoking article and leaves the smoking article.

The aerosol-forming substrate can be advantageously reduced by the inhalation of cool air through the one or more second air inlets between the rear surface of the combustible heat source and the aerosol-forming substrate during pumping by the user. temperature. This advantageously substantially prevents or inhibits the spike of the aerosol-forming substrate temperature during user aspiration.

Alternatively or in addition to one or more first air inlets, or one or more second air inlets, the smoking article according to the present invention may comprise one or more third air intakes downstream of the aerosol-forming substrate mouth.

It should be understood that the smoking article according to the present invention may comprise one or more first air inlets surrounding the periphery of the aerosol-forming substrate, or one or more of the rear surface of the combustible heat source and the aerosol-forming substrate. a second inlet, or one or more third inlets downstream of the aerosol-forming substrate, or any combination thereof.

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

Preferably, the combustible heat source is a carbonaceous heat source. As used herein, the term "carbonaceous" is used to describe a carbonaceous combustible heat source. Preferably, the combustible carbonaceous heat source used in the smoking article according to the present invention has a carbon content of at least about 35%, more preferably at least about 40%, and most preferably at least about 45%, depending on the dry weight of the combustible heat source.

In some embodiments, a combustible heat source in accordance with 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 that primarily comprises 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, depending on the dry weight of the combustible carbon-based heat source, 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%.

The smoking article according to the present invention may comprise a combustible carbonaceous heat source formed from one or more suitable carbonaceous materials.

One or more binders may be combined with the one or more carbonaceous materials, if desired. Preferably, the one or more binders are organic binders. Suitable organic binders are known, including, but not limited to, gums (eg, guar gum), modified cellulose, and cellulose derivatives (eg, methylcellulose, carboxymethylcellulose, hydroxypropylcellulose, And hydroxypropyl methylcellulose), flour, starch, sugar, vegetable oil, and combinations thereof.

In a preferred embodiment, the combustible heat source is formed from a toner mixture, modified cellulose, flour, and sugar.

Alternatively, or in addition to one or more binders, the combustible heat source used in the smoking article according to the present invention may comprise one or more additives to improve the combustible heat source characteristics. Suitable additives include, but are not limited to, additives that promote the consolidation of the combustible heat source (eg, sintering aids), additives that promote ignition of the combustible heat source (eg, oxidizing agents such as perchlorates, chlorates, nitrates) , peroxide, permanganate, zirconium, and combinations thereof, additives that promote combustion of the combustible heat source (eg, potassium and potassium salts, such as potassium citrate), and promote combustion of one or more of the combustible heat sources Additives for the thermal decomposition of gases (eg catalysts such as copper oxide, iron oxide and aluminum oxide).

A smoking article according to the present invention comprising a barrier coating disposed on a rear surface of the combustible heat source, the additive being combined with the combustible heat source before or after the barrier coating is applied to the rear surface of the combustible heat source .

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

As used herein, the term "ignition aid" is used to mean a material that releases one or both of energy and oxygen during ignition of the combustible heat source, wherein the material releases one or both of energy and oxygen in a ratio that is not surrounded by the surroundings. Limitation of oxygen diffusion. In other words, during ignition of the combustible heat source, the ratio of one or both of the released energy and oxygen is largely independent of the ratio of ambient oxygen reaching the material. As used herein, the term "ignition aid" is also used to mean a metal element that releases energy during ignition of the combustible heat source, wherein the metal element has an ignition temperature below about 500 ° C and the combustion of the metal element is at least about 5 Kilojoules per gram.

As used herein, the term "ignition aid" does not include alkali metal salts of carboxylic acids (such as alkali metal citrates, alkali metal acetates, and alkali metal succinates), alkali metal halide salts (such as alkali metal chlorides). Salts, alkali metal carbonates, or alkali metal phosphates, which are believed to alter carbon combustion. Even when a large amount of alkali metal salt is burned relative to the total weight of the combustible heat source, during the early pumping period, such burned alkali metal salt cannot release sufficient energy during ignition of a combustible heat source to produce a Accepted aerosol.

Examples of suitable oxidizing agents include, but are not limited to, nitrates such as, for example, potassium nitrate, calcium nitrate, cerium nitrate, sodium nitrate, cerium nitrate, lithium nitrate, aluminum nitrate, and ferric nitrate; nitrite; other organic and none a nitro compound; a chlorate such as, for example, sodium chlorate and potassium chlorate; a perchlorate such as, for example, sodium perchlorate; a chlorite; a bromate such as, for example, sodium bromate and Potassium bromate; perbromate; bromide; borate such as, for example, borax and potassium borate; ferrite, such as, for example, barium ferrate; ferrite; manganic acid, such as, for example, potassium manganate; Manganate, such as, for example, potassium permanganate; organic peroxides such as, for example, benzoyl peroxide and acetone peroxide; inorganic peroxides such as, for example, hydrogen peroxide, ruthenium peroxide, Magnesium oxide, calcium peroxide, barium peroxide, zinc peroxide, and lithium peroxide; superoxides such as, for example, potassium superoxide and sodium superoxide; iodate; high iodine; iodide; sulfate; Sulfate; other hydrazine; phosphate; phospinates; phosphite; and phosphanites.

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

When the smoking article according to the present invention comprises a continuous flammable heat source, comprising a substantially non-flammable gas impermeable barrier between the one or more gas flow channels and the through-combustible heat source, wherein the intake air passes through the one or more In the case of a gas flow passage, it may be advantageous to substantially prevent or inhibit such thermal decomposition and reaction products from entering the intake air of the smoking article according to the present invention through the one or more gas flow passages.

Having a substantially non-flammable gas barrier between the surface of the combustible heat source and the aerosol-forming substrate may also advantageously be substantial The inhalation air of the smoking product according to the present invention is prevented or inhibited from entering this thermal decomposition and reaction product.

The combustible carbonaceous heat source used in the smoking article according to the present invention can be prepared as described in the prior art, which is known to those skilled in the art.

A combustible carbonaceous heat source for use in a smoking article according to the present invention is preferably formed by mixing one or more carbonaceous materials with one or more binders and other additives, including, and by preforming The mixture becomes a desired shape. The mixture of the one or more carbonaceous materials, one or more binders, and optionally other additives may be preformed into a desired shape by any suitable known ceramic forming method, such as, for example, For example, slip casting, extrusion, injection molding, and molding or molding. In certain preferred embodiments, the mixture is preformed into a desired shape by molding or extrusion or a combination thereof.

Preferably, the one or more carbonaceous materials, one or more binders, and optionally other mixtures of additives are preformed into an elongated rod. However, it should be understood that a mixture of the one or more carbonaceous materials, one or more binders, and optionally other additives may be preformed into other desired shapes.

After shaping, particularly after extrusion, the elongate rod or other desired shape is preferably dried to reduce its moisture content and then heated in a non-oxidizing atmosphere at a temperature sufficient to charify the one or more binders. Decomposition, if present, and substantially eliminates any volatilization in the elongated rod or other shape. Preferably the elongated rod or other desired shape The shape is thermally decomposed in a nitrogen atmosphere at a temperature between about 700 ° C and about 900 ° C.

In certain embodiments, at least one metal nitrate is comprised of a metal nitrate precursor comprising at least one mixture of the one or more carbonaceous materials, one or more binders, and optionally other additives Combined with the combustible heat source. The at least one metal nitrate precursor is then converted in situ to at least one metal nitrate by treatment of the pre-formed cylindrical rod or other shape of thermal decomposition with an aqueous solution of nitric acid, in one embodiment, the combustible heat source comprises at least A 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 thermal decomposition temperature between about 150 ° C and about 600 ° C, more preferably between about 200 ° C and about 400 ° C.

In a preferred embodiment, contacting the combustible heat source with a conventional yellow flame lighter or other ignition device should cause thermal decomposition of at least one metal nitrate and release oxygen and energy. This thermal decomposition causes an initial rise in the temperature of the combustible heat source and also contributes to the ignition of the combustible heat source. Preferably, the combustible heat source continues to burn at a lower temperature after the at least one metal nitrate is thermally decomposed.

The inclusion of at least one metal nitrate advantageously causes ignition of the interior of the combustible heat source, not only at a point on the surface of the combustible heat source. 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 comprises at least one peroxide or superoxide that is actively oxidized at temperatures below about 600 ° C, more preferably less than about 400 ° C.

Preferably, the at least one peroxide or superoxide is oxidatively active between about 150 ° C and about 600 ° C, more preferably between about 200 ° C and about 400 ° C, and most preferably at about 350 ° C. °C.

In use, the combustible heat source contacting a conventional yellow flame lighter or other ignition device should cause at least one peroxide or superoxide to thermally decompose and release oxygen. This causes an initial rise in the temperature of the combustible heat source and also contributes to the ignition of the combustible heat source. Preferably, the combustible heat source continues to burn at a lower temperature after the at least one peroxide or superoxide is thermally decomposed.

The inclusion of at least one peroxide or superoxide advantageously causes ignition of the interior of the combustible heat source, not only at a point on the surface of the combustible heat source.

Preferably, the combustible heat source has a porosity of between about 20% and about 80%, more preferably between about 20% and 60%. When the combustible heat source comprises at least one metal nitrate, when the at least one metal nitrate is thermally decomposed and combusted, this advantageously allows oxygen to diffuse to a substantial portion of the combustible heat source at a rate sufficient to maintain combustion. More preferably, the combustible heat source has a porosity of between about 50% and about 70%, more preferably, for example, by a mercury intrusion porosimetry or a helium gravimeter, at about 50% and about 60. %between. The desired porosity can be readily obtained using conventional methods and techniques during the production of this combustible heat source.

Advantageously, the combustible carbonaceous heat source used in the smoking article according to the present invention has a distinct density of between about 0.6 gram per cubic centimeter and about 1 gram per cubic centimeter.

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

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

Preferably, the combustible heat source is substantially uniform in diameter. However, the combustible heat source may alternatively be tapered such that the diameter of the rear portion of the non-through combustible heat source is greater than the diameter of the front portion of the non-through combustible heat source. Particularly preferably, the combustible heat source is a substantially cylindrical body. The combustible heat source may, for example, be a cylinder or cone of substantially circular cross-section, or a cylinder or cone of substantially elliptical cross-section.

The smoking article according to the present invention preferably comprises an aerosol-forming substrate comprising at least one aerosol former and a material capable of releasing volatile compounds in response to heating. The aerosol-forming substrate can comprise other additives and ingredients including, but not limited to, humectants, perfumes, binders, and mixtures thereof.

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

The at least one aerosol former can be any suitable known compound or mixture of compounds. In use, it facilitates the formation of a thick and stable aerosol and is substantially resistant to thermal degradation at the operating temperature of the smoking article. Suitable aerosol formers are well known in the art and include, for example, polyols, polyol esters such as monoacetin, diacetin, or triacetin, and aliphatic monocarboxylic acids. An ester, an aliphatic ester of a dicarboxylic acid, and an aliphatic ester of a polycarboxylic acid such as dimethyldodecanedi and dimethyltetradecane. Preferred aerosol formers for use in the smoking articles according to the present invention are polyols or mixtures thereof such as triethylene glycol, 1,3-butanediol, and most preferred glycerin.

The material capable of releasing volatile compounds in response to heating may be a plant-based material. The material capable of releasing volatile compounds in response to heating may be a homogeneous plant-based material. For example, the aerosol-forming substrate may comprise one or more materials extracted from plants, including, but not limited to, tobacco; tea leaves such as green tea; mint; laurel; eucalyptus; basil; sage; verbena; Ai Ju.

Preferably, the material capable of releasing volatile compounds in response to heating may be a tobacco-based material, most preferably a homogeneous tobacco-based material.

The aerosol-forming substrate can be in the form of a plug or section comprising a material surrounded by a paper or other roll of paper and capable of releasing volatile compounds in response to heating. As noted above, the entire plug or section containing any web of paper is considered to be the aerosol-forming substrate in the form of a plug or segment of such an aerosol-forming substrate.

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

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

The smoking article according to the present invention preferably comprises a mouthpiece downstream of the aerosol-forming substrate. The mouthpiece is located at the proximal end of the smoking article.

Preferably, the mouthpiece is low in filtration efficiency, more preferably in very low filtration efficiency. The mouthpiece can be a single section or component mouthpiece. Alternatively, the mouthpiece can be a multi-section or multi-component mouthpiece.

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

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

The transfer element can abut one or both of the aerosol-forming substrate and the mouthpiece. Alternatively, the delivery element can be spaced from one or both of the aerosol-forming substrate and the mouthpiece.

The inclusion of a transfer element advantageously allows the aerosol to be cooled by heat transfer from the combustible heat source to the aerosol-forming substrate. Contain A transfer element also advantageously allows the overall length of the smoking article according to the present invention to be adjusted to a desired value, for example, by appropriate selection of the length of the transfer member, to a length similar to that of a conventional cigarette.

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

Preferably, the transfer element comprises at least one open tubular hollow body. In such embodiments, in use, when the inhaled air passing through the smoking article passes from the aerosol-forming substrate to the proximal end of the smoking article and passes downstream through the smoking article, the inhaled air passes through the at least one Open tubular hollow body.

The transfer element can comprise at least one open tubular hollow body formed from one or more suitable materials, the suitable material substantially at the aerosol temperature produced by thermal conduction from the combustible heat source to the aerosol-forming substrate It is thermally stable. Suitable materials are known in the art and include, but are not limited to, paper, paperboard, plastic, such as cellulose acetate, ceramics, and combinations thereof.

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

The aerosol-cooling element can comprise a gathered sheet of material from a metal foil, a polymeric material, and substantially non-porous Choose from a group of paper or cardboard. In certain embodiments, the aerosol-cooling element can comprise a gathered sheet of material from polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polyethylene terephthalate. Selected from the group consisting of alcohol ester (PET), polylactic acid (PLA), cellulose acetate (CA), and aluminum foil.

In certain preferred embodiments, the aerosol-cooling element can comprise an aggregated sheet of biodegradable polymeric material, such as polylactic acid (PLA), or Mater-Bi® grade (commercially available starch copolymerization at home). ester).

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

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

As used herein, the term "fragrance" is used to describe any agent that, upon use, imparts one or both of the aerosol taste or aroma produced by the aerosol-forming substrate of the smoking article.

As used herein, the term "chemical aesthetic agent" is used to describe any agent that is perceived by a user's mouth or olfactory cavity when used, by sensing differently than via a taste receptor or olfactory receptor cell. Other ways, or another way. The perception of a chemical aesthetic agent is usually via a "trigeminal neural response" via the trigeminal, pharyngeal, vagus, or some combination of these. Generally, chemical aesthetic agents are considered to be hot, spicy, cool, or soothing.

The smoking article according to the present invention may comprise one or more aerosol modifiers downstream of the aerosol-forming substrate, the aerosol modifier being both a fragrance and a chemical aesthetic agent. For example, one or more of the mouthpiece, the transfer element, and the aerosol-cooling element of the smoking article according to the present invention may comprise mint or other fragrance that provides a cool chemical aesthetic effect.

The smoking article according to the invention can be assembled using known methods and machinery.

2‧‧‧Smoking

4‧‧‧Combustible heat source

6‧‧‧ front surface

8‧‧‧Back surface

10‧‧‧Aerosol forming substrate

12‧‧‧Transfer components

14‧‧‧Aerosol cooling element

16‧‧‧Isolation components

18‧‧‧ cigarette holder

20‧‧‧Roll paper

22‧‧‧ barrier

24‧‧‧Homogeneous tobacco materials

26‧‧‧ Plug wrap

28‧‧‧Cylindrical open hollow cellulose acetate tube

30‧‧‧Cylindrical open hollow paper or cardboard tube

32‧‧‧Filter materials

34‧‧‧ Plug wrap

36‧‧‧Single heat conduction element

38‧‧‧Roll paper

40‧‧‧First air inlet

42‧‧‧Smoking

44‧‧‧ flow channel

46‧‧‧Substantially non-flammable and non-breathable barrier

The invention will be further described by way of example only, with reference to the accompanying drawings in which: FIG. 1 is a schematic cross-sectional view of a smoking article in accordance with a first embodiment of the present invention. Fig. 2 is a schematic longitudinal sectional view showing a smoking article according to a third embodiment of the present invention. Figure 3a shows a temperature diagram of the portion of the smoking article according to the present invention after the combustible heat source during smoking. Figure 3b is a graph showing the temperature of an aerosol-generating substrate during smoking according to the present invention.

According to the first embodiment of the present invention, the smoking article 2 comprises a non-through combustible heat source 4 having a front surface 6 and an opposite rear surface 8 and an aerosol-forming substrate 10 aligned coaxially. A transfer element 12, an aerosol cooling element 14, an isolation element 16, and a mouthpiece 18.

The non-through combustible heat source 4 is a non-through carbonaceous combustible heat source and is located at the distal end of the smoking article 2. As shown in Fig. 1, a substantially non-flammable gas barrier 22 in the form of an aluminum foil disk is disposed between the rear surface 8 of the non-through combustible heat source 4 and the aerosol-forming substrate 10. The barrier 22 is applied to the rear surface 8 of the non-through combustible heat source 4 by pressing the aluminum foil disc onto the rear surface 8 of the non-through combustible heat source 4, and adjacent to the surface 8 after the non-through combustible heat source 4 and the aerosol-forming base Material 10.

In other embodiments of the invention (not shown), the substantially non-flammable gas impermeable barrier 22 between the surface 8 and the aerosol-forming substrate 10 after the non-through combustible heat source 4 may be omitted.

The aerosol-forming substrate 10 is immediately downstream of the barrier 22 applied to the rear surface 8 of the non-through combustible heat source 4. The aerosol-forming substrate 10 comprises a cylindrical plug of a homogeneous tobacco-like material 24 comprising an aerosol former, such as, for example, glycerin, encased in a plug wrap 26.

The transfer element 12 is downstream of the aerosol-forming substrate 10 and comprises a cylindrical open-type hollow cellulose acetate tube 28.

The aerosol-cooling element 14 is immediately downstream of the transfer element 12 and comprises an aggregated sheet of biodegradable polymeric material such as, for example, polylactic acid.

The spacer element 16 is immediately downstream of the aerosol-cooling element 14 and includes a cylindrical open hollow paper or cardboard tube 30.

The mouthpiece 18 is immediately downstream of the spacer element 16. As shown in Fig. 1, the mouthpiece 18 is located at the proximal end of the smoking article 2, and a cylindrical plug containing a suitable filter material 32, the material being wrapped in a filter plug wrap 34, such as, for example, It is a cellulose acetate tow with very low filtration efficiency.

The smoking article may further comprise a tipping tape (not shown) surrounding a downstream end portion of the outer wrapping paper 20.

As shown in Figure 1, the smoking article 2 further comprises a single thermally conductive element 36 of a suitable material, such as, for example, an aluminum foil. The heat conducting element covers a rear portion of the non-through combustible heat source 4, the entire length of the aerosol-forming substrate 10, and the entire length of the transmission element 12.

In other embodiments of the invention (not shown), the transfer element 12 can extend beyond the single thermally conductive element 36 in a downstream direction. That is, the single thermally conductive element 36 can cover only the front portion of the transfer element 12. In other embodiments of the invention (not shown), the single thermally conductive element 36 may not cover any of the transfer elements 12.

In a further embodiment of the invention (not shown), the aerosol-forming substrate 10 can extend beyond the single thermally conductive element 36 in a downstream direction. That is, the single thermally conductive element 36 can cover only the front portion of the aerosol-forming substrate 10.

The single thermally conductive element 36 is radially separated from the non-through combustible heat source 4 and the aerosol-forming substrate 10 by a roll of paper 38 of a low-breathable insulating sheet material, such as, for example, cigarette paper, the roll paper The aerosol-forming substrate 10, the transfer member 12, and the periphery of the portion after the non-through combustor heat source 4 are wrapped.

According to the smoking article 2 of the first embodiment of the present invention shown in Fig. 1, the single heat conducting member 36 and the roll paper 38 extend in the upstream direction to approximately the same position on the non-through combustor heat source 4, so that the single heat conducting member 36 and the upstream end of the web 38 are substantially aligned beyond the non-through combustible heat source 4. The web 38 radially separates the single thermally conductive element 36 from the non-through combustible heat source 4 and the aerosol-forming substrate 10.

However, it should be understood that in other embodiments of the invention (not shown), the web 38 of the single thermally conductive element 36 that is radially separated from the non-through combustible heat source 4 and the aerosol-forming substrate 10 may be upstream. The direction extends beyond the single thermally conductive element 36.

The smoking article 2 according to the first embodiment of the present invention comprises one or more first air inlets 38 surrounding the periphery of the aerosol-forming substrate 10.

As shown in FIG. 1, a circumferentially arranged first air inlet 40 is disposed in the plug wrap 26 of the aerosol-forming substrate 10, the single heat conducting element 36 and the non-through combustible heat source 4 and the gas. The roll paper 38, which is radially separated from the sol-forming substrate 10, and the single heat-conducting element 36 are allowed to enter the aerosol-forming substrate 10 in a cool air (as indicated by the dashed arrow in Fig. 1).

In use, in accordance with a first embodiment of the present invention, a user ignites the non-through combi igniting heat source 4 of the smoking article 2 and draws in the mouthpiece 18. When a user inhales on the mouthpiece 18, cool air (as indicated by the dashed arrow in Fig. 1) is drawn into the aerosol-forming substrate 10 of the article 2 through the first air inlets 40.

The front portion of the aerosol-forming substrate 10 is heated by heat conduction through the surface 8 and the barrier 22 after passing through the non-through combustible heat source 4.

Heating of the aerosol-forming substrate 10 by thermal conduction releases glycerin and other volatile and semi-volatile compounds from the plug of the homogeneous tobacco-based material 24, and the compounds released from the aerosol-forming substrate 10 are formed. An aerosol. When the aerosol flows through the aerosol-forming substrate 10, the aerosol is entrained in the air, and the air is drawn into the aerosol-forming substrate 10 of the smoking article 2 through the first air inlets 40. The inhaled air and entrained aerosol (as indicated by the dashed arrows in Figures 1 and 2) pass downstream through the transfer element 12, aerosol cooling element 14, and isolation element 16, where it is cooled and condensed. In accordance with a first embodiment of the present invention, the cooled intake air and entrained aerosol pass downstream of the mouthpiece 18 and through the proximal end of the article 2 for delivery to the user. The substantially non-flammable gas impermeable barrier 22 on the rear surface 8 of the non-through combustible heat source 4 isolates the non-through combustible heat source 4 from the air drawn in through the smoking article 2 such that, in use, it is inhaled through the smoking article 2 The air does not directly contact the non-through combustible heat source 4 .

In use, the single thermally conductive element 36 retains thermal energy within the smoking article 2 to help maintain the temperature of the aerosol-forming substrate 10, thereby helping to continue and enhance aerosol delivery. In addition, the single thermally conductive element 36 transfers heat along the aerosol heat forming substrate 10 such that thermal energy is dispersed through a relatively large volume of the aerosol-forming substrate 10. This helps provide a more consistent aerosol delivery of successive aspirations.

A smoking article (not shown) according to the second embodiment of the present invention has substantially the same structure as the smoking article according to the first embodiment of the present invention shown in Fig. 1. However, in the smoking article according to the second embodiment of the present invention, the single heat conducting member 36 and the non-through combustible heat source 4 and the aerosol are caused The roll paper 38 forming the radially separated substrate 10 is omitted, and the single heat conducting member 36 is formed of a bonding material comprising an outer layer of a thermally conductive material and an inner layer of a heat insulating material. In the smoking article according to the second embodiment of the present invention, the outer layer of the heat conductive material of the single heat conducting member 36 and the non-through combustible heat source 4 and the aerosol forming base are formed by the inner layer of the heat insulating layer material of the single heat conducting member 36. The material 10 is radially separated.

The smoking article 42 according to the third embodiment of the present invention shown in Fig. 2 has the same basic structure as the smoking article according to the first embodiment of the present invention shown in Fig. 1. However, in the smoking article 42 according to the second embodiment of the present invention, the first air inlet 40 surrounding the aerosol forming substrate 10 is omitted, and the combustible heat source 4 is always connected to a combustible carbonaceous heat source. The heat source includes a single central airflow passage 44 extending from the front surface 6 of the through combustible heat source 4 to the rear surface 8.

As shown in FIG. 2, a substantially non-flammable gas barrier 46 is disposed between the combustible heat source 4 and the central gas flow passage 44. The barrier 46 includes a substantially non-flammable, gas impermeable barrier coating disposed over the entire interior surface of the single central gas flow passage 44.

In use, in accordance with a third embodiment of the present invention, a user ignites the through combustible heat source 4 of the smoking article 42 and then inhales the mouthpiece 18. When a user inhales on the mouthpiece 18, cool air (as indicated by the dashed arrow in Fig. 2) is drawn through the central airflow passage 44 into the aerosol-forming substrate 10 of the smoking article 2. a substantially non-flammable gas impermeable barrier 22 on the rear surface 8 of the through-combustible heat source 4 and a substantially non-flammable gas impermeable barrier 46 on the inner surface of the single central gas flow passage 44, the through-combustible heat source 4 and the passage therethrough The air inhaled by the smoking article 42 is isolated, The air drawn in through the smoking article 42 does not directly contact the through-combustible heat source 4 when in use.

In other embodiments of the invention (not shown), a substantially non-flammable gas impermeable barrier 22 between the rear surface 8 of the through combustible heat source 4 and the aerosol-forming substrate 10 may be omitted.

A smoking article (not shown) according to the fourth embodiment of the present invention has substantially the same structure as the smoking article according to the third embodiment of the present invention shown in Fig. 2. However, in the smoking article according to the fourth embodiment of the present invention, the roll paper 38 that radially separates the single heat conduction member 36 from the non-through through-combustible heat source 4 and the aerosol-forming substrate 10 is omitted. The single thermally conductive element 36 is formed from a conforming material comprising an outer layer of a thermally conductive material and an inner layer of a thermally insulating material. In the smoking article according to the fourth embodiment of the present invention, the outer layer of the heat conductive material of the single heat conducting member 36 is formed by the inner layer of the heat insulating material of the single heat conducting member 36 and the through combustible heat source 4 and the aerosol. The substrate 10 is radially separated.

Example A

A smoking article according to the present invention having substantially the same structure as the above-described smoking article according to the second embodiment of the present invention is assembled. The smoking article comprises a single thermally conductive element formed from a conforming material comprising an outer layer of aluminum and an inner layer of paper. The smoking article does not comprise an outer roll of paper such that the aluminum outer layer of the single thermally conductive element is visible in the appearance of the smoking article. The first air inlet having no circumferential arrangement surrounds the periphery of the aerosol-forming substrate, but the smoking article includes a third air inlet arranged around a circumference of the periphery of the transmission element.

In the smoking article according to the present invention, the aluminum outer layer of the single thermally conductive element is radially separated from the non-through combustible heat source and the aerosol-forming substrate by the inner layer of the single thermally conductive element.

Comparison example B

For the purpose of comparison, a smoking article not according to the invention is assembled. The smoking article not according to the present invention comprises a single thermally conductive element formed from a conforming material comprising an inner aluminum layer and an outer layer of paper. Further, the smoking article is not in accordance with the present invention and is different from the structure of the smoking article according to Example A of the present invention.

In the smoking article not according to the invention, the aluminum inner layer of the single thermally conductive element directly contacts the non-through combustible heat source and the aerosol-forming substrate.

During the combustion of the combustible heat source, measuring the temperature of the smoking article according to Example A of the present invention and the portion of the non-through combustible heat source of the smoking article not according to the inventive example B, using a thermocouple in the smoking article, connecting to the The aerosol produces the surface of the smoking article at a position 1 mm upstream of the substrate. The measurement results are shown in Figure 3a.

During the combustion of the combustible heat source, the temperature of the smoking article according to Example A of the present invention and the portion of the aerosol-forming substrate that is not the smoking article according to Example B of the present invention is measured, and a thermocouple is used in the smoking article to connect to The surface of the smoking article at a position 6 mm downstream of the combustible heat source. The measurement results are shown in Figure 3b.

In order to measure the temperature of the non-through combustible heat source and the portion of the aerosol-forming substrate, the article is ignited using a conventional yellow flame lighter and is sterilized by the Health Canada smoking system. Smoking, using a smoking machine, more than 12 puffs, one puff of 55 ml, a puff duration of 2 seconds, and a puff interval of 30 seconds. Smoking and smoking machine specifications are listed in ISO Standard 3308 (ISO 3308:2000). Atmospheric conditions and tests are detailed in ISO Standard 3402.

As shown in Figures 3a and 3b, compared to the smoking article according to the present invention, the temperature of the non-through combustible heat source of the smoking article and the rear portion of the aerosol-forming substrate is not reduced according to the inventive example B, particularly Late pumping period. This resulted in a dry total particulate matter (DTPM) delivery amount (10.3 mg) which was not according to Example B of the present invention, which was lower than the dry total particulate matter (DTPM) delivery amount (17.4 mg) of the smoking article according to Example A of the present invention.

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

2‧‧‧Smoking

4‧‧‧Combustible heat source

6‧‧‧ front surface

8‧‧‧Back surface

10‧‧‧Aerosol forming substrate

12‧‧‧Transfer components

14‧‧‧Aerosol cooling element

16‧‧‧Isolation components

18‧‧‧ cigarette holder

22‧‧‧ barrier

24‧‧‧Homogeneous tobacco materials

26‧‧‧ Plug wrap

28‧‧‧Cylindrical open hollow cellulose acetate tube

30‧‧‧Cylindrical open hollow paper or cardboard tube

32‧‧‧Filter materials

34‧‧‧ Plug wrap

36‧‧‧Single heat conduction element

38‧‧‧Roll paper

40‧‧‧First air inlet

Claims (15)

A smoking article comprising: a combustible heat source having a front surface and a rear surface; an aerosol-forming substrate downstream of the rear surface of the combustible heat source; and a single heat conducting element covering the combustible heat source a rear portion and at least a front portion of the aerosol-forming substrate, wherein the single thermally conductive element comprises one or more layers of thermally conductive material, and the one or more layers of thermally conductive material are radially separated from the combustible heat source and the aerosol-forming substrate Wherein the combustible heat source is a non-through combustible heat source, or the combustible heat source is always a combustible heat source, and the article further comprises a substantially non-flammable gas barrier between the through combustible heat source and the one or more gas flow channels The one or more airflow passages extend from the front surface of the through-combustible heat source to the rear surface, and wherein the single heat-conducting element includes an outer layer of thermally conductive material visible in the appearance of the article of smoking. The smoking article of claim 1, wherein the one or more layers of thermally conductive material are radially separated from the combustible heat source and the aerosol-forming substrate by one or more layers of insulating material. The smoking article of claim 1 or 2, wherein the one or more layers of thermally conductive material are radially separated from the combustible heat source and the aerosol-forming substrate by at least 50 microns. The smoking article of any one of claims 1 to 3, wherein the single thermally conductive element is formed from a conforming material comprising one or more layers of thermally conductive material and one or more layers of insulating material. The smoking article of claim 4, wherein the one or more layers of thermally conductive material are radially separated from the combustible heat source and the aerosol-forming substrate by at least one layer of one or more layers of insulating material. The smoking article of any one of claims 1 to 5, wherein the one or more layers of thermally conductive material comprise a heat reflective material. The smoking article of claim 6, wherein the heat reflective material reflects more than 50% of the incident radiation. The smoking article of any one of claims 1 to 7, wherein the single thermally conductive element covers the entire length of the aerosol-forming substrate. The smoking article of claim 8, wherein the single thermally conductive element extends downstream beyond the aerosol-forming substrate. The smoking article of any one of claims 1 to 9 further comprising a substantially non-flammable gas barrier between the surface of the combustible heat source and the aerosol-forming substrate. The smoking article of any one of claims 1 to 10, further comprising one or more first air inlets surrounding the aerosol forming substrate periphery. The smoking article of any one of claims 1 to 11, wherein the aerosol-forming substrate abuts the rear surface of the combustible heat source. The smoking article of any one of claims 1 to 12, wherein the aerosol-forming substrate system is separated from the rear surface of the combustible heat source. The smoking article of any one of claims 1 to 13, further comprising one or more second air inlets located between the rear surface of the combustible heat source and the aerosol-forming substrate. The smoking article of any one of claims 1 to 14, further comprising one or more aerosol modifiers located downstream of the aerosol-forming substrate.