TWI654943B - Smoke product with a single radial separation of thermally conductive elements - Google Patents

Abstract

A smoking article (2, 42) includes: a combustible heat source (4) having a front surface (6) and a rear surface (8) opposite to the front surface (6); and an aerosol-forming base downstream of the combustible heat source (4) rear surface (8) Material (10); and a single thermally conductive element (36) covering a rear portion of the combustible heat source (4) and at least a front portion of the aerosol-forming substrate (10). The single thermally conductive element (36) includes one or more thermally conductive materials, and the one or more thermally conductive materials are radially separated from the combustible heat source (4) and the aerosol-forming substrate (10). The combustible heat source (4) is a non-through combustible heat source, or the combustible heat source (4) is a combustible heat source, and the cigarette (42) further includes a through combustible heat source and one or more airflow channels (44). ) Between the substantially non-combustible and air-impermeable barrier (46), the one or more airflow channels extend from the front surface (6) to the rear surface (8) of the through combustible heat source. The single heat-conducting element includes an outer layer made of a heat-conducting material and visible on the exterior of the smoking article.

Description

Cigarette with a single radially separated thermally conductive element

The invention relates to a smoking article, which comprises a flammable heat source having a front surface and a rear surface opposite to each other, an aerosol-forming substrate downstream of the rear surface of the flammable heat source, and a single thermally conductive element covering the single thermally conductive element. A rear portion of the combustible heat source and the aerosol form at least a front portion of the substrate.

Many tobacco products that are heated by tobacco rather than burned have been proposed in the art. One of the purposes of such "heated" cigarettes is to reduce the known harmful smoke constituents of this type produced in conventional cigarettes by tobacco combustion and pyrolytic degradation. In one known type of heated smoking article, an aerosol is produced by transferring heat from a combustible heat source to an aerosol-forming substrate. The aerosol-forming substrate may be located within, downstream from, or surrounding the combustible heat source. During smoking, volatile compounds are released from the aerosol-forming substrate by heat transfer from the combustible heat source, and are entrained in the air sucked through the cigarette. As the released compounds cool, they condense to form an aerosol inhaled by the user. Normally, air is drawn into this known heated smoking article through one or more gases arranged to pass through the combustible heat source Flow channels, and through forced thermal 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 includes a combustible heat source, an aerosol-forming substrate downstream of the combustible heat source, and a thermally conductive element surrounding the rear part of the combustible heat source and the aerosol. Adjacent front parts of the substrate are formed and in direct contact with them.

The heat-conducting element in WO-A2-2009 / 022232 smoke product transfers heat generated during the 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 necessary to maintain the temperature of the aerosol-forming substrate within a specific range to optimize the aerosol delivery to the user. In some cases, radiant heat loss from an outer surface of a thermally conductive element surrounding and directly contacting the combustible heat source and the aerosol-forming substrate can cause the temperature of the combustible heat source and the aerosol-forming substrate to drop to a desired level. Outside the range, which affects the performance of the cigarette. If the temperature of the aerosol-forming substrate is reduced too low, for example, it can have an adverse effect on the consistency and total amount of aerosol delivered to the user.

A smoking article disclosed in EP-A1-2 550 879 includes: a multi-layer pipe 9 including at least a metal layer and a paper layer; a carbon heat source 4 arranged at an end portion of the pipe 9 at least partially directly The inner surface of the pipe member 9 is closely contacted with a smoke odor emitting source 8 which is arranged in the pipe member 9 adjacent to the carbon heat source 4; and a holder portion 14 which keeps the carbon heat source 4 directly in contact with the The end portion, and the carbon heat source 4 is kept close to 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. Portions of the three-layer composite sheet 16 protrude from the two-layer composite sheet 15 to form the holder portion 14. As shown in FIG. 2, the two-layer composite sheet 15 includes an inner aluminum layer 17 and an outer paper layer 18, and the three-layer composite sheet 16 includes 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 cigarettes, in addition to heat transfer through a thermally conductive element, forced heat convection transfer is provided from a combustible heat source to the aerosol-forming substrate. For example, in some known heated cigarettes, one or more airflow channels are provided along the combustible heat source to provide forced thermal convective heating of the aerosol-forming substrate. In such smoking articles, the aerosol-forming substrate is heated by a combination of thermal conduction and forced thermal convection heating.

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

In known heated smoking articles where heat transfer from the combustible heat source to the aerosol-forming substrate occurs primarily by forced thermal convection, the forced thermal convection transfer and thus the temperature in the aerosol-forming substrate Depending on the user's smoking behavior, it can vary greatly. As a result, the constituents of mainstream aerosols and their sensory properties produced by such known heated tobacco products may be disadvantageously highly sensitive to the smoking method of the user.

In particular, in a known heated smoking article comprising one or more airflow channels along the flammable heat source, the suction air passing through the one or more airflow channels and the flammable heat source are caused between the user and the user during a puff. The direct contact causes the combustion activation of the combustible heat source. Therefore, a strong suction method can cause a sufficiently high forced thermal convection transfer, causing a spike in the temperature of the aerosol-forming substrate, which adversely leads to thermal decomposition and possibly even local combustion of the aerosol-forming substrate. 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 degree of unwanted thermal decomposition and combustion of by-products in mainstream aerosols from such known heated smoking articles is also disadvantageously very significant with the particular smoking method adopted by the user.

In other heated smoking articles, no airflow passage is provided through the combustible heat source. In this type of heated smoking article, the heating of the aerosol-forming substrate is mainly obtained through a thermally conductive element through heat conduction transfer. In the heating of the aerosol-forming substrate mainly by heating conduction through 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 this type of heated smoking article, any cooling of the thermally conductive element surrounding and directly contacting the combustible heat source and the aerosol-forming substrate due to radiant heat loss is also reduced by comparison with the aerosol-forming substrate. The heating aerosol produced by forced convection heating may have a greater effect on the generation of the aerosol.

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

According to the present invention, there is provided a smoking article, the smoking article comprising: a combustible heat source having a front surface and a rear surface opposite to each other; an aerosol-forming substrate downstream of the rear surface of the combustible heat source; and a single thermally conductive element that covers A rear portion of the combustible heat source and at least a front portion of the aerosol-forming substrate. The single thermally conductive element includes one or more thermally conductive materials, and the one or more thermally conductive materials 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 a combustible heat source, and the cigarette further includes a substantially non-combustible, air-impermeable barrier between the through combustible heat source and one or more airflow channels. The single heat-conducting element includes an outer layer made of a heat-conducting material and visible on the exterior of the smoking article.

As used herein, the terms "distal," "upstream," and "front", and "proximal," "downstream," and "rear" are used to describe the smoking components or The relative position of a part of the component relative to the user's direction of inhalation on the smoking article. The smoking article according to the present invention includes a proximal end, and in use, an aerosol passes through the proximal end and leaves the smoking article for delivery to a user. The proximal end of the smoking article may 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 generated by the smoking article.

The combustible heat source is located at or near the distal end. The mouth end is tied 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 may also be referred to as the upstream end of the smoking article. The components or parts of components of a smoking article according to the present invention may be described as upstream or downstream of each other based on their relative positions 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 furthest from the proximal end of the cigarette. The rear surface of the combustible heat source is tied to the downstream end of the combustible heat source. The downstream end of the combustible heat source is the end of the combustible heat source closest to the proximal end of the cigarette.

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

As used herein, the term "aerosol-forming substrate" is used to describe a substrate capable of releasing when heating a volatile compound, which substrate can form an aerosol. The aerosol generated from the aerosol-forming substrate of the smoking article according to the present invention may be visible or invisible, and may contain vapor (e.g., particulates of substances in a gaseous state, which are usually liquid or Solids) and droplets of gas and condensed vapor.

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

As used herein, the term "direct contact" is used to refer to the contact between two components without any intermediate material such that the surfaces of the components are in contact with each other.

The aerosol-forming substrate may be in the form of a plug or a segment, and contains a material capable of releasing when heating 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 segment including the roll paper is considered to be the aerosol-forming substrate.

In such embodiments, one or more thermally conductive materials of the single thermally conductive element are radially separated from the roll paper of the aerosol-forming substrate.

The smoking article according to the present invention includes 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 includes one or more thermally conductive materials, and the one or more thermally conductive materials are radially separated from the combustible heat source and the aerosol-forming substrate.

The smoking article according to the present invention does not include any heat conducting element which is additionally on the bottom layer of or covers the single heat conducting element. In particular, the smoking article according to the present invention does not include any thermally conductive elements surrounding and in direct contact with one or both of the combustible heat source and the aerosol-forming substrate.

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

As used herein, the term "non-through" is used to describe a combustible heat source in which no air flow passage extends from the front surface to the rear surface of the combustible heat source.

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

As used herein, the term "airflow channel" is used to describe a channel extending along the length of a flammable heat source, through which air for user inhalation can be drawn into downstream.

As used herein, the term "through" is used to describe a flammable heat source with one or more airflow channels extending from the front surface to the rear surface of the flammable heat source.

In use, the inhaled air for the user to inhale through the smoking article containing a non-through combustible heat source according to the present invention passes through one or more airflow channels along the through combustible heat source. In a smoking article comprising a continuously combustible heat source according to the present invention, the heating of the aerosol-forming substrate occurs by thermal conduction and forced thermal convection.

According to the present invention, a smoking article including a through-combustible heat source, further comprising a substantially non-combustible gas-impermeable between the through-combustible heat source and the one or more airflow channels extending from a front surface to a rear surface of the through-combustion heat source barrier.

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

When the smoking article according to the present invention contains a non-through combustible heat source, it lacks any airflow passage through the non-through combustible heat source, and advantageously prevents or inhibits the combustion activation of the non-through combustible heat source during the user's puff.

Similarly, when the smoking article according to the present invention contains a continuously combustible heat source, a substantially non-combustible incombustible is contained between the straight combustible heat source and the one or more airflow channels extending from the front surface to the rear surface of the through combustible heat source The breathable barrier advantageously prevents or inhibits the combustion activation of the through combustible heat source during the user's puff.

Preventing or inhibiting the combustion activation of the combustible heat source during the user's puffing advantageously advantageously prevents or inhibits the aerosol of the smoking article according to the invention from forming a spike in the temperature of the substrate.

By preventing or inhibiting the combustion activation of the combustible heat source, and also preventing or inhibiting the temperature increase in the aerosol-forming substrate from being exceeded, the aerosol-forming substrate of the smoking article according to the present invention is subjected to a strong suction method Its burning or thermal decomposition can be advantageously avoided. In addition, the effect of the user smoking method on the mainstream aerosol composition of the smoking article according to the present invention can be advantageously 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 the single thermally conductive element are radially separated from the combustible heat source and the aerosol-forming substrate. This limits heat transfer from the combustible heat source to the single thermally conductive element and heat transfer from the single thermally conductive element to the aerosol-forming substrate. In use, this advantageously helps to maintain the aerosol-forming substrate in the smoking article according to the invention The temperature obtained in is lower than the temperature at which the aerosol-forming substrate may undergo combustion or thermal decomposition.

Preferably, the heat transfer system that conducts heat 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, the thermal conduction of the known heated smoking article surrounding and directly contacting a rear part of the flammable heat source and at least a front part of the aerosol-forming substrate compared to the thermally conductive element. Component, keep a lower temperature.

In the heated smoking article surrounding and directly contacting a rear part of the combustible heat source and at least a front part of the aerosol-forming substrate, heat consumption generated by heat conduction transfer through the heat conduction element significantly makes the combustible heat source Part of the temperature decreases. This shortens the combustion life of the combustible heat source and can lead to unacceptable aerosol delivery.

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

The single thermally conductive element advantageously reduces heat loss from the combustible heat source. During the smoking of the smoking article, when heat is generated by the combustible heat source, one or more layers of the thermally conductive material of the single thermally conductive element increase the temperature. The temperature of one or more layers of the single thermally conductive element increases, reducing the temperature difference between the combustible heat source and the covered component of the smoking article, so that the heat loss from the combustible heat source can be reduced.

By reducing heat loss from the flammable 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 thermally conductive materials 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 therefore improves the heating of the aerosol-forming substrate. The improvement in heat transfer obtained by containing the single thermally conductive element is particularly beneficial to cigarettes containing a non-through combustible heat source without substantial forced convective transfer in accordance with the present invention.

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 is preferably achieved through one or more layers containing one or more of the single thermally conductive elements to conduct thermal conduction. A material and an intermediate layer material between the combustible heat source and the aerosol-forming substrate. The one or more intermediate layer materials may be disposed on the single thermally conductive element covering the entire area of the combustible heat source and the aerosol-forming substrate. Alternatively, the one or more intermediate layer materials may be provided only in part or in a part of this area. In some embodiments, the one or more intermediate layer materials may extend over one or more layers of the single thermally conductive element in one or both of the upstream and downstream directions.

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

For example, in some preferred embodiments of the present invention, the rear portion of the combustible heat source and at least a front portion of the aerosol-forming substrate covered by the single thermally conductive element are both covered by a paper roll, the paper roll being along the smoke The length of the product surrounds the smoking product at least in part. In such embodiments, the paper roll forms a single thermally conductive element with the combustible heat source and the aerosol to form a substrate diameter. 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 thermally conductive material disposed on the outside of the smoking article, so that the outer thermally conductive material of the single thermally conductive element is visible on the exterior of the smoking article.

In some embodiments, one or more layers of the thermally conductive material of the single thermally conductive element are radially separated from the combustible heat source and the aerosol-forming substrate by a rolled paper extending along all or only a portion of the smoking article. In such embodiments, the roll paper wraps around the cigarette, covers 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 roll paper.

The arrangement of the single thermally conductive element covering one of the cigarettes of the smoking article may provide benefits over the appearance of the smoking article according to the present invention, particularly during and after smoking. In some cases, when the roll paper is exposed to heat from the combustible heat source, some discoloration of the roll paper can be observed in the area of the combustible heat source. The migration of volatile compounds from the aerosol-forming substrate to the roll paper surrounding the aerosol-forming substrate and downstream of the aerosol-forming substrate can cause additional discoloration of the roll paper. In some embodiments, the single thermally conductive element of the smoking article according to the present invention may be disposed on the roll paper surrounding at least a rear portion of the combustible heat source and at least a front portion of the aerosol-forming substrate, so that the The discoloration is covered and is no longer visible or rare, and in certain embodiments, the single thermally conductive element may extend around the full length of the aerosol-forming substrate. In certain preferred embodiments, the single thermally conductive element may extend downstream beyond the aerosol-forming substrate. Therefore, the original appearance of the smoking article can be retained during smoking.

Instead of or in addition to one or more layers of thermally conductive material between the single thermally conductive element and one or more thermally conductive materials between the flammable heat source and the aerosol-forming substrate, at least a part of the single thermally conductive element may be connected to the air gap The combustible heat source is radially separated from the aerosol-forming substrate. An air gap may be provided to pass through one or more insulation elements containing one or more thermally conductive materials between the single thermally conductive element and the combustible heat source and the aerosol-forming substrate, so that the single thermally conductive element and the combustible heat source A defined distance is maintained from the aerosol-forming substrate. The one or more isolation elements may be, for example, one or more paper strips radially surrounding the combustible heat source and the aerosol-forming substrate.

Preferably, one or more layers of the 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 at least 50 microns. 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 at least 75 microns or more, or at least 100 microns or more.

When one or more layers of heat-insulating material are disposed between the one or more layers of heat-conducting material of the single heat-conducting element and the combustible heat source and the aerosol-forming substrate, as described above, the one or more layers of heat-conducting material of the single heat-conducting element and 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 thermal insulation material.

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

Preferably, when measured using the Modified Transient Plane Source (MTPS) method, At 50% relative humidity, one or more layers of thermally conductive material of the single thermally conductive element include a thermal conductivity of approximately 10 watts per meter in kelvin (W / (M‧K)) and approximately 500 watts per meter in kelvin ( W / (M‧K)), preferably between about 15 watts per meter in kelvin (W / (M‧K)) and about 400 watts per meter in kelvin (W / (M‧ K)). Suitable thermally conductive materials include, but are not limited to: metal foil roll paper 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 some preferred embodiments, the single thermally conductive element comprises one or more layers of aluminum.

Preferably, the one or more thermally conductive materials of the single thermally conductive element include a heat reflective material, such as aluminum or steel. In such embodiments, in use, the single thermally conductive element advantageously reflects heat 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 "thermally reflective material" refers to a material that has a relatively high thermal reflectivity and a relatively low thermal emission such that a larger portion of the incident radiation is reflected from the surface of the material compared to the thermal emission of the material . Preferably, the heat reflecting material reflects more than 50% of incident radiation, more preferably more than 70% of incident radiation, and most preferably more than 75% of 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.

The heat reflection of one or more thermally conductive materials of the single thermally conductive element can be improved by disposing one or more thermally conductive materials of the single thermally conductive element with a shiny inner surface, wherein the inner surface faces the combustible heat source and the reflective gas. The sol forms the surface of the substrate.

The single thermally conductive element may be in the form of a single layer of thermally conductive material. Alternatively, the single heat-conducting element may be in the form of a multilayer or a laminating material, the multilayer or a laminating material comprising at least one layer of a thermally conductive material, and combining one or more other thermally or non-thermally conductive layers. In such embodiments, the at least one layer of thermally conductive material may include any of the thermally conductive materials listed above.

In some preferred embodiments, the single heat-conducting element may be in the form of a bonding material including at least one layer of thermally conductive material and at least one layer of thermally insulating material. In such embodiments, the inner layer of the single thermally conductive element facing the combustible heat source and the aerosol-forming substrate may be a layer of thermal insulation material. In this manner, the inner layer of thermal insulation material provides the required radial separation between at least one layer of the single thermally conductive element and the combustible heat source and the aerosol-forming substrate thermally conductive material.

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

In some preferred embodiments, the single thermally conductive element is a bonding material comprising a single layer of thermally conductive material and one or more layers of thermal insulation material. In some particularly preferred embodiments, the single thermally conductive element is a bonding material including a single layer of thermally conductive material and a single layer of thermal insulation material. Preferably, the single heat-conducting element is a bonding material including an outer layer of a single heat-conducting material and an inner layer of a single heat-insulating material.

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

During the production of the smoking article according to the invention, it is particularly advantageous to use a single thermally conductive element comprising a conformable material, since the at least one thermal insulation layer can provide additional strength and rigidity. This makes the bonding material easier to process and reduces the risk of collapse or fracture of the at least one thermally conductive layer, which can be relatively thin and fragile.

Preferably the thickness of the single thermally conductive element is between about 5 microns and about 100 microns, and 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 some embodiments, the single thermally conductive element may include an aluminum foil having a thickness of about 20 microns.

In some preferred embodiments, the single thermally conductive element may include a bonding material including 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 range 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 delivery profile of the smoking article, the unit can be adjusted in the upstream and downstream directions. The range of the thermally conductive element relative to the combustible heat source and the aerosol-forming substrate.

The single thermally conductive element may extend around all or part of the circumference of the smoking article. Preferably, the single thermally conductive element forms a continuous sleeve surrounding the smoking article along 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 some 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 may be aligned with the downstream end of the aerosol-forming substrate. Alternatively, the single thermally conductive element may 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 in a downstream direction beyond the single thermally conductive element.

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

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

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

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

During the use of a smoking article according to the present invention, the inclusion of a non-through combustible heat source can advantageously substantially prevent or suppress combustion and heat when an indirect flammable heat source is ignited and burned by the inhaled air entering through the smoking article. Decomposition products and other substances. This is particularly advantageous when the non-through combustible heat source contains one or more additives to help the non-through combustible heat source ignite or burn.

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

It should be understood that the smoking article according to the present invention may include non-through combustible heat sources, and these non-through combustible heat sources include one or more closed or blocked passages through which air cannot be inhaled for user inhalation.

For example, a smoking article according to the present invention may include a non-through combustible heat source that includes one or more of the paths along the length of the non-through combustible heat source, extending only from a portion of the surface before the non-through combustible heat source upstream end. Closed channel.

Containing one or more closed air passages increases the surface area of the non-through combustible heat source that is exposed to oxygen in the air, and can advantageously facilitate ignition and continuous combustion of the non-through combustible heat source.

Alternatively, the smoking article according to the present invention may include a through combustible heat source having one or more airflow channels extending from a front surface to a rear surface of the through combustible heat source.

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

As used herein, the term "closed" is used to describe an airflow channel 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 include one or more non-closed airflow channels. For example, the one or more airflow channels may include one or more grooves or other non-closed airflow channels extending along the outside of the through combustible heat source.

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

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

In certain preferred embodiments, the smoking article according to the present invention includes a single air flow channel extending from the front surface to the rear surface of the through combustible heat source.

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

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

It should be understood that in addition to one or more air passages for the user to inhale air through which the air can be drawn, the smoking article according to the present invention may include a through combustible heat source, the through combustible heat source comprising one or more Closed or blocked passages through which air cannot be drawn for users' inhalation.

For example, a smoking article according to the present invention may include a through combustible heat source including one or more airflow channels extending from the front surface to the rear surface of the combustible heat source, and one or more along the length of the combustible heat source, only A closed channel extending part of the path from the front surface of the through-combustible heat source.

Containing one or more closed air passages increases the surface area of the through combustible heat source that is exposed to oxygen in the air, and can advantageously promote ignition and continuous combustion of the through combustible heat source.

The smoking article according to the present invention includes a through combustible heat source, the smoking article further includes a substantially non-combustible air-impermeable barrier, the substantially non-combustible air-impermeable barrier between the through-combustible heat source and the one or more through-combustible heat sources The front surface extends between the air flow channels on the rear surface.

Containing a substantially non-flammable, air-impermeable barrier between the through combustible heat source and the one or more airflow channels extending from a front surface to a rear surface of the through combustible heat source, when the intake air passes through the one or more airflow channels During the ignition and combustion of the inhaled air entering the smoking article through one or more airflow channels to ignite and burn through a combustible heat source, the products and other substances formed by combustion and thermal decomposition can be substantially prevented or suppressed. This is particularly advantageous when the through combustible heat source contains one or more additives to help the through combustible heat source ignite or burn.

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

In some preferred embodiments, the barrier includes a substantially non-flammable, air-impermeable barrier coating disposed on an inner surface of the one or more airflow channels. 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 airflow channels, and more preferably the barrier comprises a barrier over the one or more airflow channels. Provides a coated barrier over 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 may be provided by inserting a gasket into the one or more airflow channels. For example, in this one When the one or more airflow channels include one or more closed airflow channels extending through the interior of the through-combustible heat source, a substantially non-combustible air-impermeable hollow tube may be inserted into each of the one or more airflow channels.

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

The thickness of the barrier can be adjusted appropriately to achieve good smoking performance. In some embodiments, the barrier thickness may 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-combustible 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, silicon dioxide, silicon dioxide-alumina, zirconia, And cerium oxide; zeolites; zirconium phosphate; and other ceramic materials or combinations thereof.

The barrier preferably is formed from materials including 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 their oxides.

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

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

When the smoking article according to the present invention comprises a flammable heat source and a substantially non-flammable, air-impermeable barrier between the rear surface of the flammable heat source and the aerosol-forming substrate, the barrier should allow air to enter the smoking article, Pass the one or more airflow channels extending from the front surface to the rear surface of the through combustible heat source, suck downstream, and pass through the smoking article.

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

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

In some preferred embodiments, the barrier includes a substantially non-flammable, air-impermeable barrier coating disposed on a 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 on the entire rear surface of the combustible heat source.

The barrier can advantageously limit the temperature at which the aerosol-forming substrate is exposed during the ignition and combustion of the combustible heat source in order to limit the exposure of the aerosol-forming substrate. 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 help the combustible heat source ignite.

In order to facilitate the formation of aerosols, the aerosol-forming substrate for heating the smoking article usually contains a polyhydric alcohol, such as glycerol, or other known aerosol-forming materials. During storage and smoking, such aerosol formers can migrate from the aerosol-forming substrate of the known heated smoking article to a flammable heat source of the smoking article. Migrating the aerosol formation to the flammable heat source of the known heated smoking article may adversely cause thermal decomposition of the aerosol forming article, especially during smoking of the heated smoking article.

A substantially non-combustible, air-impermeable barrier containing the smoking article according to the present invention between the back surface of the combustible heat source and the aerosol-forming substrate 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 in addition, a substantially non-flammable, air-impermeable barrier containing the smoking article according to the present invention between the back surface of the combustible heat source and the aerosol-forming substrate may advantageously be used during the smoking article. The components of the aerosol-forming substrate are prevented or inhibited from migrating to the combustible heat source.

Containing a substantially non-flammable, air-impermeable barrier between the rear surface of the combustible heat source and the aerosol-forming substrate is particularly advantageous when the aerosol-forming substrate contains at least one aerosol-forming substance.

In such embodiments, a substantially non-flammable, air-impermeable barrier containing the smoking article according to the present invention between the rear surface of the combustible heat source and the aerosol-forming substrate may be used during storage and use of the smoking article. Have Advantageously substantially prevents or inhibits migration of at least one aerosol-forming substance 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 therefore advantageously be substantially avoided or reduced.

According to the required characteristics and performance of the smoking article, the substantially non-flammable, air-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. In some embodiments, the material forming the barrier may have an overall thermal conductivity of about 0.1 Watt per meter in kelvins when measured using a modified instantaneous planar heat source (MTPS) method at 23 ° C and 50% relative humidity. (Kelvin) (W / (M‧K)) and approximately 200 watts per meter (W / (M‧K)).

The thickness of the barrier can be adjusted appropriately to achieve good smoking performance. In some embodiments, the barrier thickness may 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-combustible at temperatures reached by the flammable heat source during ignition and combustion. Suitable materials are known in the art and include, but are not limited to, clays (eg, for example, bentonite and kaolin), glass, minerals, ceramic materials, resins, metals, and combinations thereof.

The material of the barrier is preferably formed from clay and glass, and the material of the barrier is preferably formed from copper, aluminum, stainless steel, alloy, aluminum oxide (Al ₂ O ₃ ), resin and mineral glue.

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

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

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

Due to the slight air permeability of the clay, in the embodiment, when the barrier includes a clay coating disposed on the rear surface of the combustible heat source, the clay coating is more preferably at least about 50 microns thick, and most preferably Between about 50 microns and about 350 microns.

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

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

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 includes a barrier coating disposed on the rear surface of the combustible heat source, the barrier coating may be applied to cover and attach 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, materials Material transfer (eg, brushing or gluing), electrostatic deposition, or any combination thereof.

For example, the barrier coating can be formed by pre-forming a barrier having a size and shape similar to 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 may 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 rear surface of the combustible heat source by gluing or pressing the aluminum foil to the combustible heat source, and then cutting or other processing is performed to cover and attach the aluminum foil to at least the substantial substance of the combustible heat source The entire rear surface, preferably, covers and attaches 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 back surface of the combustible heat source can be dipped by a solution or suspension of one or more suitable coating materials, or by spraying or spraying the solution or suspension of one or more suitable coating materials onto the combustible. The barrier coating may be applied to the back surface of the combustible heat source, or by electrostatically depositing one or more powders or powder mixtures of a suitable coating material onto the back surface of the combustible 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, the barrier coating is preferably applied to the back surface of the combustible heat source, preferably before the electrostatic deposition, the The rear surface of the combustible heat source is treated with water glass in advance. Preferably, the barrier coating is applied by spraying.

The barrier coating can be formed by applying a single solution or suspension of one or more suitable coating materials to the rear surface of the combustible heat source. Alternatively, the barrier coating may be formed by applying a solution or suspension of one or more suitable coating materials to the rear surface of the combustible heat source multiple times. For example, the barrier coating may 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 may be 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 may 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 rear surface of the combustible heat source multiple times, the combustible heat source needs to be dried between successive application of the solution or suspension .

Alternatively or in addition to drying, after applying 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. When the barrier coating is a glass or ceramic coating, sintering the barrier coating is particularly preferred. 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 include one or more first air inlets surrounding the periphery of the aerosol-forming substrate.

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

The smoking article according to the present invention comprises one or more first air inlets surrounding the aerosol-forming substrate. When in use, cool air passes through the first air inlets and is inhaled by the smoking article. The aerosol forms a substrate. The air passing through the first air inlets is sucked into the aerosol-forming substrate, passes downstream from the aerosol-forming substrate, passes through the smoking article, passes through the proximal end of the smoking article, and leaves the smoking article. .

During the user's suction, the inhaled cool air passing through one or more first air inlets surrounding the periphery of the aerosol-forming substrate advantageously reduces the temperature of the aerosol-forming substrate. This advantageously prevents or inhibits the aerosol from forming spikes in the temperature of the substrate during the user's puff.

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

By preventing or suppressing spikes in the temperature of the aerosol-forming substrate, containing one or more first air inlets around the periphery of the aerosol-forming substrate, it helps to avoid or reduce the aerosol advantageously under the strong suction method The sol forms the substrate for combustion or thermal decomposition. In addition, containing one or more first air inlets surrounding the aerosol-forming substrate advantageously helps to minimize or reduce the influence of the user's smoking method on the components of the mainstream aerosol of the cigarette.

In some preferred embodiments, the one or more first air inlet systems are located adjacent to a downstream end of the aerosol-forming substrate.

In some embodiments, the aerosol-forming substrate may abut the rear 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 back surface of the combustible heat source or a substantially non-flammable, air-impermeable barrier coating disposed on the back surface of the combustible heat source.

In other embodiments, the aerosol-forming substrate may be separated from a rear 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 "spaced" is used to describe that the aerosol-forming substrate is not in direct contact with the back surface of the flammable heat source or a substantially non-flammable, air-impermeable barrier coating disposed on the back surface of the flammable 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 include one or more first sections 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. The inhaled air that is drawn into the space between the combustible heat source and the aerosol-forming substrate through the second air inlet passes from the space between the combustible heat source and the aerosol-forming substrate to the downstream through the The smoking article passes through the proximal end of the smoking article and leaves the smoking article.

During the user's suction, cool air is drawn through the one or more second air inlets between the rear surface of the combustible heat source and the aerosol-forming substrate, which can advantageously reduce the aerosol-forming substrate. temperature. This advantageously prevents or inhibits the aerosol from forming spikes in the temperature of the substrate during the user's puff.

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 include one or more third air inlets downstream of the aerosol-forming substrate. mouth.

It should be understood that the smoking article according to the present invention may include 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 air inlet, or one or more third air inlets downstream of the aerosol-forming substrate, or any combination thereof.

The number, shape, size, and position of the air inlets can be adjusted appropriately 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 carbon-containing combustible heat source. Preferably, based on the dry weight of the combustible heat source, 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%.

In some embodiments, the combustible heat source according to the present invention is a combustible carbon-based heat source. As used herein, the term "carbon-based heat source" is used to describe a heat source mainly containing 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 invention may comprise a combustible carbonaceous heat source formed from one or more suitable carbonaceous materials.

If desired, one or more adhesives may be combined with the one or more carbonaceous materials. Preferably, the one or more adhesives are organic adhesives. Known suitable organic binders include, but are not limited to, gums (e.g., guar gum), modified cellulose, and cellulose derivatives (e.g., methyl cellulose, carboxymethyl cellulose, hydroxypropyl cellulose, And hydroxypropyl methyl cellulose), flour, starch, sugar, vegetable oil, and combinations thereof.

In a preferred embodiment, the combustible heat source is formed from a carbon powder 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 include one or more additives to improve the characteristics of the combustible heat source. Suitable additives include, but are not limited to, additives that promote consolidation of the combustible heat source (e.g., sintering aids), additives that promote ignition of the combustible heat source (e.g., oxidants such as perchlorate, chlorate, nitrate , Peroxides, permanganates, zirconium, and combinations thereof), additives (e.g., potassium and potassium salts such as potassium citrate) that promote the combustion of the combustible heat source, and promote the combustion of one or more of the combustible heat sources to produce Additives for thermal decomposition of gases (eg catalysts such as copper oxide, iron oxide and aluminum oxide).

The smoking article according to the invention comprises a barrier coating provided on the rear surface of the combustible heat source, and such additives can be combined with the combustible heat source before or after the barrier coating is applied to the back surface of the combustible heat source. .

In some preferred embodiments, the combustible heat source is a combustible carbonaceous heat source containing carbon and at least one ignition aid. In a preferred embodiment, the combustible heat source is a combustible carbonaceous heat source containing 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 the ignition of the combustible heat source, wherein the ratio of the material that releases one or both of energy and oxygen is not affected by the surroundings Limitation of oxygen diffusion. In other words, during the ignition of the combustible heat source, the ratio of one or both of the released energy and oxygen is largely independent of the rate at which the surrounding oxygen can reach the material. As used herein, the term "ignition aid" is also used to refer to a metal element that releases energy during the ignition of the combustible heat source, wherein the ignition temperature of the metal element is below about 500 ° C, and the combustion heating of the metal element is at least about 5 Kilojoules / g.

As used herein, the term "ignition aid" does not include alkali metal salts of carboxylic acids (such as alkali metal citrate, alkali metal acetate, and alkali metal succinate), alkali metal halide salts (such as alkali metal chloride) Salts), alkali metal carbonates, or alkali metal phosphates, which are believed to alter carbon combustion. Even when there is a large amount of burning alkali metal salt relative to the total weight of the combustible heat source, during the early pumping period, such burning alkali metal salt cannot release enough energy to generate a combustible heat source during the ignition of a combustible heat source. Accepted aerosol.

Examples of suitable oxidants include, but are not limited to: nitrates, such as, for example, potassium nitrate, calcium nitrate, strontium nitrate, sodium nitrate, barium nitrate, lithium nitrate, aluminum nitrate, and iron nitrate; nitrites; other organic and non- Organic nitro compounds; chlorates such as, for example, sodium chlorate and potassium chlorate; perchlorates such as, for example, sodium perchlorate; chlorites; bromates such as, for example, sodium bromate and Potassium bromate; perbromide; bromide; borate such as, for example, borax and potassium borate; ferrate such as, for example, barium ferrate; ferrite; manganate such as, for example, potassium manganate; high Manganates, such as, for example, potassium permanganate; organic peroxides, such as, for example, benzoyl peroxide and acetone peroxide; inorganic peroxides, such as, for example, hydrogen peroxide, strontium peroxide, peroxide Magnesium oxide, calcium peroxide, barium peroxide, zinc peroxide, and lithium peroxide; superoxides such as, for example, potassium superoxide and sodium superoxide; iodates; periodic iodine; iodides; sulfates; Sulfates; other sulfites; phosphates; phosphates; phosphites; and phosphates.

Although the ignition and combustion properties of the combustible heat source are advantageously improved, the inclusion of ignition and combustion additives during use of the smoking article can cause unwanted thermal decomposition and reaction products. For example, the inclusion of the combustible heat source to help the thermal decomposition of nitrates ignited by the combustible heat source may lead to the formation of nitrogen oxides.

When the smoking article according to the present invention includes a continuously combustible heat source, it includes a substantially non-combustible, air-impermeable barrier between the one or more airflow channels and the through combustible heat source, and the inhaled air passes through the one or more In the case of the air flow channels, it may be advantageous to substantially prevent or inhibit such thermal decomposition and reaction products from entering the inhaled air of the smoking article according to the invention through the one or more air flow channels.

It may also be advantageous to include a substantially non-flammable, air-impermeable barrier between the rear surface of the combustible heat source and the aerosol-forming substrate. This prevents or inhibits such thermal decomposition and reaction products from entering the inhaled air of the smoking article according to the present invention.

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.

The combustible carbonaceous heat source used in the 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, which are contained therein and are formed by pre-forming The mixture becomes a desired shape. The mixture of the one or more carbonaceous materials, one or more binders, and optionally other additives can be pre-formed into a desired shape using any suitable known ceramic forming method, such as, For example, slip casting, extrusion, injection molding, and compaction or compression. In some preferred embodiments, the mixture is pre-formed into a desired shape by molding or extrusion or a combination thereof.

Preferably, the mixture of the one or more carbonaceous materials, one or more adhesives, and optionally other additives is preformed into an elongated rod. However, it should be understood that the mixture of the one or more carbonaceous materials, one or more adhesives, and optionally other additives may be pre-formed into other desired shapes.

After forming, particularly after extrusion, the elongated 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 carbonize the one or more adhesives. Disintegrate, if present, and substantially eliminate any volatilization in the elongated rod or other shape. Preferably the elongated rod or other desired shape It is thermally decomposed in a nitrogen atmosphere at a temperature between about 700 ° C and about 900 ° C.

In some embodiments, by including at least one metal nitrate precursor in a mixture of the one or more carbonaceous materials, one or more binders, and optionally other additives, at least one metal nitrate Combined with this combustible heat source. The at least one metal nitrate precursor is then converted in situ into at least one metal nitrate by treating the preformed cylindrical rod or other shape with a nitric acid aqueous solution. In one embodiment, the combustible heat source includes at least A metal nitrate having a thermal decomposition temperature of less than about 600 ° C, and 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, the contact of 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 increase in the temperature of the combustible heat source and also contributes to the ignition of the combustible heat source. After the thermal decomposition of at least one metal nitrate, the combustible heat source preferably continues to burn at a lower temperature.

Containing at least one metal nitrate advantageously causes ignition within the combustible heat source, not only at a point on the surface of the combustible heat source. Preferably, based on the dry weight of the combustible heat source, the amount of the at least one metal nitrate present in the combustible heat source is between about 20% and about 50%.

In other embodiments, the combustible heat source comprises at least one peroxide or superoxide, the peroxide or superoxide being oxidatively active at a temperature below about 600 ° C, more preferably a temperature below about 400 ° C.

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

In use, the combustible heat source contacting a traditional 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 increase in the temperature of the combustible heat source and also contributes to the ignition of the combustible heat source. After thermal decomposition of at least one peroxide or superoxide, it is preferred that the combustible heat source continue to burn at a lower temperature.

Containing at least one peroxide or superoxide advantageously causes ignition within 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 between about 20% and about 80%, more preferably between about 20% and 60%. When the combustible heat source contains at least one metal nitrate, this advantageously allows oxygen to diffuse to a large portion of the combustible heat source at a rate sufficient to sustain combustion when the at least one metal nitrate undergoes thermal decomposition and combustion. More preferably, the combustible heat source has a porosity between about 50% and about 70%, and is more preferably measured by, for example, a mercury intrusion porosimeter or a helium specific gravity method, at about 50% and about 60 %between. During the production of this combustible heat source, the required porosity can be easily obtained using conventional methods and techniques.

Advantageously, the combustible carbonaceous heat source used in the smoking article according to the present invention has a significant density between about 0.6 g / cm3 and about 1 g / cm3.

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

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

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

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

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

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

The at least one aerosol former may be any suitable known compound or mixture of compounds. In use, it is beneficial to form a thick and stable aerosol, and it is substantially resistant to thermal degradation at the working temperature of the cigarette. Suitable aerosol formers are well known in the art and include, for example, polyols, polyol esters such as glyceryl monoacetate, glyceryl diacetate, or glyceryl triacetate, and aliphatic monocarboxylic acids Esters, aliphatic esters of dicarboxylic acids, and aliphatic esters of polycarboxylic acids such as dimethyldodecanedi and dimethyltetradecane. The preferred aerosol formers for the smoking articles according to the present invention are polyols or mixtures thereof, such as triethylene glycol, 1,3-butanediol, and most preferably glycerol.

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 material mainly composed of a homogeneous plant. For example, the aerosol-forming substrate may include one or more materials extracted from plants, including, but not limited to: tobacco; tea, such as green tea; mint; laurel; eucalyptus; basil; sage; verbena; and incense Tansy.

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

The aerosol-forming substrate may be in the form of a plug or segment that includes a material surrounded by a paper or other rolled paper and capable of releasing volatile compounds in response to heating. As mentioned above, when an aerosol-forming substrate is in the form of such a plug or segment, the entire plug or segment including any roll paper is considered to be the aerosol-forming substrate.

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

In a preferred embodiment, the aerosol-forming substrate includes a plug of tobacco-based material wrapped in a plug cover. In a particularly preferred embodiment, the aerosol-forming substrate comprises a plug of homogeneous tobacco-based material wrapped in a plug cover.

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

Preferably, the cigarette holder has a low filtering efficiency, and more preferably a very low filtering efficiency. The mouthpiece may be a single section or a component mouthpiece. Alternatively, the cigarette holder may be a multi-segment or multi-component cigarette holder.

The cigarette holder may contain a filter comprising one or more sections containing 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 in addition, the cigarette holder may include one or more segments containing absorbents, adsorbents, perfumes, and other aerosol modifiers and additives, or combinations thereof.

The smoking article according to the element preferably further includes a transmission element or an isolation element between the aerosol-forming substrate and the cigarette holder.

The transfer element may abut one or both of the aerosol-forming substrate and the cigarette holder. Alternatively, the transfer element may be spaced from one or both of the aerosol-forming substrate and the cigarette holder.

The inclusion of a transfer element advantageously allows cooling of the aerosol generated by heat transfer from the combustible heat source to the aerosol-forming substrate. With Having a transmission element also advantageously allows the total length of the smoking article according to the present invention to be adjusted to a desired value, for example, by a suitable selection of the length of the transmission element, to a length similar to a conventional cigarette.

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

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 may include at least one open tubular hollow body formed from one or more suitable materials. At the aerosol temperature generated by heat conduction from the combustible heat source to the aerosol-forming substrate, the suitable materials are substantially It is thermally stable. Suitable materials are known in the art and include, but are not limited to, paper, cardboard, plastics, such as cellulose acetate, ceramics, and combinations thereof.

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

The aerosol cooling element may include an aggregated sheet of material from a metal foil, a polymeric material, and a substantially non-porous material. Choose from a group of paper or cardboard. In some embodiments, the aerosol cooling element may include an aggregated sheet of material from polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polyethylene terephthalate Select 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 may comprise an aggregated sheet of a biodegradable polymer material, such as polylactic acid (PLA), or a Mater-Bi® grade (commercially available starch-based copolymers) 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 contain one or more aerosol modifiers.

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

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

As used herein, the term "chemical esthetic agent" is used to describe, when used, any agent that perceives the mouth or olfactory cavity of a user by means other than those sensed by taste receptors or olfactory receptor cells. Other ways, or another way. Chemoesthetics are usually sensed through a "trigeminal response," via the trigeminal nerve, glossopharyngeal nerve, vagus nerve, or some combination of these. Generally, chemical aesthetics are considered hot, spicy, cool, or soothing.

The smoking article according to the present invention may include one or more aerosol modifiers downstream of the aerosol-forming substrate. The aerosol modifier is both a perfume and a chemical aesthetic agent. For example, one or more of the cigarette holder, the transfer element, and the aerosol cooling element of the smoking article according to the present invention may contain mint or other flavors that may provide a cooling chemical aesthetic effect.

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

2‧‧‧ Tobacco

4‧‧‧ Combustible heat source

6‧‧‧ front surface

8‧‧‧ rear surface

10‧‧‧ aerosol-forming substrate

12‧‧‧ transfer element

14‧‧‧ aerosol cooling element

16‧‧‧Isolation element

18‧‧‧ cigarette holder

20‧‧‧ roll paper

22‧‧‧ barrier

24‧‧‧ homogeneous tobacco materials

26‧‧‧ Plug Cover

28‧‧‧ cylindrical open, hollow cellulose acetate tube

30‧‧‧ cylindrical open hollow paper or cardboard tube

32‧‧‧Filter material

34‧‧‧ Plug Cover

36‧‧‧Single thermal conductive element

38‧‧‧ roll paper

40‧‧‧first air inlet

42‧‧‧ Tobacco

44‧‧‧airflow channel

46‧‧‧ Substantially non-combustible airtight barrier

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

The smoking article 2 according to the first embodiment of the present invention shown in FIG. 1 includes a non-through combustible heat source 4 with a front surface 6 and an opposite rear surface 8 and an aerosol-forming substrate 10 adjacent to each other in coaxial alignment. , A transmission element 12, an aerosol cooling element 14, an isolation element 16, and a cigarette holder 18.

The non-through combustible heat source 4 is a non-through carbon combustible heat source, and is located at the far end of the cigarette 2. As shown in FIG. 1, a substantially non-combustible air-impermeable barrier 22 in the form of an aluminum foil disc is disposed between the rear surface 8 of the non-through combustible heat source 4 and the aerosol-forming substrate 10. By pressing the aluminum foil disc onto the rear surface 8 of the non-through combustible heat source 4, the barrier 22 is applied to the rear surface 8 of the non-through combustible heat source 4 and adjacent to the rear surface 8 of the non-through combustible heat source 4 and the aerosol-forming substrate.材 10。 Material 10.

In other embodiments of the present invention (not shown), the substantially non-flammable and air-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 located 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 includes a cylindrical plug of a homogeneous tobacco-like material 24 that includes an aerosol-forming material, such as, for example, glycerol, enclosed in a plug cover 26.

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

The aerosol cooling element 14 is located immediately downstream of the transfer element 12 and an aggregated sheet containing a biodegradable polymer material such as, for example, polylactic acid.

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

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

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

As shown in FIG. 1, the smoking article 2 further comprises a single thermally conductive element 36 of a suitable material, such as, for example, aluminum foil. The thermally conductive 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 present invention (not shown), the transmission element 12 may extend beyond the single thermally conductive element 36 in a downstream direction. That is, the single heat-conducting element 36 may cover only the front portion of the transmission element 12. In other embodiments of the present invention (not shown), the single heat-conducting element 36 may not cover any of the transmission elements 12.

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

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

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

It should be understood, however, that in other embodiments of the present invention (not shown), the roll paper 38 that radially separates the single thermally conductive element 36 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 includes one or more first air inlets 40 surrounding the periphery of the aerosol-forming substrate 10.

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

In use, according to the first embodiment of the present invention, a user ignites the non-through combustible heat source 4 of the cigarette 2 and inhales on the cigarette holder 18. When a user inhales on the cigarette holder 18, cool air (as shown by the dashed arrow in the first figure) passes through the first air inlets 40 and is sucked into the aerosol-forming substrate 10 of the cigarette 2.

The front part 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.

By heating the aerosol-forming substrate 10 by heat conduction, glycerin and other volatile and semi-volatile compounds are released from the plug of the homogeneous tobacco-like 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 they are cooled and condensed. According to the first embodiment of the present invention, the cooled inhaled air and entrained aerosol pass downstream through the mouthpiece 18 and pass through the proximal end of the cigarette 2 to the user. The substantially non-combustible air-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 through the smoking article 2 so that, when in use, it is sucked through the smoking article 2 The air is not in direct contact with the indirect combustible heat source 4.

In use, the single thermally conductive element 36 maintains thermal energy in the smoking article 2 to help maintain the temperature of the aerosol-forming substrate 10, thereby helping to continue and enhance the aerosol transport. In addition, the single heat-conducting element 36 transfers heat along the aerosol-forming substrate 10, so that thermal energy is dispersed through a larger volume of the aerosol-forming substrate 10. This helps provide a more consistent aerosol delivery of successive aspirates.

A smoking article (not shown) according to a second embodiment of the present invention is basically the same as the smoking article according to the first embodiment of the present invention shown in FIG. However, in the smoking article according to the second embodiment of the present invention, the single thermally conductive element 36 is connected to the non-through combustible heat source 4 and the aerosol. The roll paper 38 forming the radial separation of the base material 10 is omitted, and the single thermally conductive element 36 is formed of a bonding material that includes 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, with the inner layer of the heat-insulating material of the single heat-conducting element 36, the outer layer of the heat-conducting material of the single heat-conducting element 36 and the indirect combustible heat source 4 and the aerosol form a base The material 10 is radially separated.

The smoking article 42 according to the third embodiment of the present invention shown in FIG. 2 is basically the same as the smoking article 42 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 with a combustible carbon heat source. The heat source includes a single central airflow channel 44 extending from the front surface 6 to the rear surface 8 of the through combustible heat source 4.

As shown in FIG. 2, a substantially non-combustible air-impermeable barrier 46 is disposed between the combustible heat source 4 and the central airflow channel 44. The barrier 46 includes a substantially non-flammable, air-impermeable barrier coating disposed on the entire inner surface of the single central airflow channel 44.

In use, according to a third embodiment of the present invention, a user ignites the through combustible heat source 4 of the cigarette 42 and inhales on the cigarette holder 18. When a user inhales on the cigarette holder 18, cool air (as shown by the dashed arrow in FIG. 2) passes through the central airflow channel 44 and is drawn into the aerosol-forming substrate 10 of the smoking article 2. A substantially non-combustible air-impermeable barrier 22 on the rear surface 8 of the through combustible heat source 4 and a substantially non-combustible air-impermeable barrier 46 on the inner surface of the single central airflow channel 44 pass the through combustible heat source 4 through the The air inhaled by the smoking article 42 is isolated, In use, the air drawn through the smoking article 42 does not directly contact the through combustible heat source 4.

In other embodiments of the present invention (not shown), the substantially non-flammable and air-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 a fourth embodiment of the present invention has the same basic structure as the smoking article according to the third embodiment of the present invention shown in FIG. However, in the smoking article according to the fourth embodiment of the present invention, the roll paper 38 that radially separates the single heat-conducting element 36 from the non-through-through combustible heat source 4 and the aerosol-forming substrate 10 is omitted, and the The single thermally conductive element 36 is formed of a bonding material, which includes an outer layer of a thermally conductive material and an inner layer of a heat insulating material. In the smoking article according to the fourth embodiment of the present invention, with the inner layer of the heat-insulating material of the single heat-conducting element 36, the outer layer of the heat-conductive material of the single heat-conducting element 36 is formed with 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 is assembled having substantially the same structure as the smoking article according to the second embodiment of the present invention. The smoking article includes a single heat-conducting element formed by a laminating material, the laminating material includes an aluminum outer layer and an inner paper layer. The smoking article does not include an outer roll of paper, so that the aluminum outer layer of the single thermally conductive element is visible on the appearance of the smoking article. There is not a circumferentially arranged first air inlet around the periphery of the aerosol-forming substrate, but the cigarette includes a circumferentially arranged third air inlet around 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 a paper inner layer of the single thermally conductive element.

Comparative example B

For comparison purposes, a smoking article that is not according to the invention is assembled. The smoking article, which is not according to the present invention, includes a single thermally conductive element formed from a bonding material, which includes an inner layer of aluminum and an outer layer of paper. In addition, the smoking article is not according to the present invention and has a different structure from the smoking article according to Example A of the present invention.

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

During the combustion of the combustible heat source, the temperature of the rear part of the non-straight combustible heat source of the cigarette according to Example A of the present invention and the non-through combustible heat source of the cigarette according to Example B of the present invention is measured. The aerosol produces the surface of the smoking article 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 rear part of the aerosol-forming substrate according to Example A of the present invention and the aerosol that is not according to Example B of the present invention was measured. A thermocouple was used in the cigarette to connect to The surface of the smoking article 6 mm downstream of the combustible heat source. The measurement results are shown in Figure 3b.

In order to measure the temperature of the indirect combustible heat source and the back part of the aerosol-forming substrate, the cigarette was ignited using a traditional yellow flame lighter, and the health Canada smoking method was used (Health Canada smoking method) Smoking, using a smoking machine, more than 12 puffs, a 55ml puff, a puff duration of 2 seconds, and a puff interval of 30 seconds. The smoking and smoking machine specifications are detailed in ISO Standard 3308 (ISO3308: 2000). Atmospheric conditions and tests are detailed in ISO Standard 3402.

As shown in Figs. 3a and 3b, compared with the smoking article according to the present invention, the temperature of the non-through combustible heat source and the aerosol-forming substrate of the smoking article which is not according to the example B of the present invention decreases, especially in the Late suction period. This resulted in a dry total particulate matter (DTPM) delivery amount (10.3 mg) of the smoking article not according to Example B of the present invention being lower than a 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 used to illustrate the present invention. However, other embodiments can be generated as defined in the scope of the patent application 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.

Claims (15)

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 thermally conductive 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 thermally conductive materials are radially separated from the combustible heat source and the aerosol-forming substrate Wherein the combustible heat source is a non-direct combustible heat source, or the combustible heat source is a combustible heat source, and the tobacco product further includes a substantially non-combustible and non-flammable gas source between the direct combustible heat source and one or more airflow channels. A breathable barrier, the one or more airflow channels extending from the front surface to the rear surface of the through-combustible heat source, and wherein the single thermally conductive element comprises an outer layer made of a thermally conductive material visible on the exterior of the smoking article. 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 thermal insulation material. 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 at least 50 microns. The smoking article of claim 1, wherein the single thermally conductive element is formed of a laminating material, the laminating material comprises one or more thermally conductive materials and one or more thermally insulating materials. 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 of one or more layers of thermal insulation material. The smoking article according to any one of claims 1 to 5, wherein the one or more layers of thermally conductive material comprises a heat reflective material. The cigarette of claim 6, wherein the heat reflective material reflects more than 50% of the incident radiation. The smoking article according to any one of claims 1 to 5, 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 5, further comprising a substantially non-flammable, air-impermeable barrier between the rear surface of the combustible heat source and the aerosol-forming substrate. The smoking article according to any one of claims 1 to 5, further comprising one or more first air inlets, forming a periphery of the substrate around the aerosol. The smoking article according to any one of claims 1 to 5, wherein the aerosol-forming substrate is adjacent to the rear surface of the combustible heat source. The smoking article according to any one of claims 1 to 5, wherein the aerosol-forming substrate is spaced from the rear surface of the combustible heat source. The smoking article according to any one of claims 1 to 5, 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 according to any one of claims 1 to 5, further comprising one or more aerosol modifiers located downstream of the aerosol-forming substrate.