SMOKING ARTICLE

专利摘要:
smoking article with dual, radially separated, non-overlapping heat conducting elements. the present invention relates to a smoking article (2, 44, 50) comprising: a combustible heat source (4) having opposite front face (6) and rear face (8); an aerosol forming substrate (10) downstream of the back face (8) of the combustible heat source (4); a first heat conducting element (36) comprising one or more radially inner layers of heat conducting material overlying a rear portion of the combustible heat source (4); and a second heat conducting element (38, 64) comprising one or more radially outer layers of heat conducting material overlying at least a portion of the aerosol forming substrate (10), wherein one or more radially outer layers of the heat-conducting material are not superimposed on one or more radially inner layers of the heat-conducting material.
公开号:BR112016002652B1
申请号:R112016002652-7
申请日:2014-09-01
公开日:2021-09-08
发明作者:Samuel Bonnely
申请人:Philip Morris Products S.A；
IPC主号:

专利说明:

[001] The present invention relates to a smoking article comprising a combustible heat source with front and rear faces opposite each other, an aerosol forming substrate downstream of the rear face of the combustible heat source and conductive elements. non-overlapping radially separated double heat.
[002] Several smoking articles in which the tobacco is heated instead of being burnt have already been proposed in the prior art. One of the goals of such "heated" smoking articles is to reduce the already known harmful smoke constituents, of the type produced by the combustion and pyrolytic degradation of tobacco, in conventional cigarettes. In one type of heated smoking article, an aerosol is generated by transferring heat from a combustible heat source to an aerosol forming substrate. The aerosol forming substrate may be located within, around or downstream of the combustible heat source. During smoking, volatile compounds are released from the aerosol forming substrate via heat transfer from the combustible heat source and puffed along with the air drawn through the smoking article. As the released compounds cool, they condense to form an aerosol that is inhaled by the user. Typically, air is drawn into one of these known smoking articles through one or more air flow channels provided by the combustible heat source and heat transfer from the combustible heat source to the aerosol forming substrate occurs. by forced convection and conduction.
[003] For example, WO-A2-2009/022232 describes a smoking article comprising a combustible heat source, an aerosol forming substrate downstream of the combustible heat source, and a heat conducting element around the , and in direct contact with a rear portion of the combustible heat source and an adjacent front portion of the aerosol forming substrate. The smoking article may further include a glove around a rear portion of the aerosol generating substrate. The sleeve is downstream of and spaced apart from the heat conducting element. WO-A2-2009/022232 describes that the glove can serve as a barrier material and prevent migration of the aerosol former to the outer surface of the smoking article. WO-A2-2009/022232 also describes that the glove can serve to slightly modulate the slope of the temperature gradient along the length of the aerosol generating substrate by retaining heat at the rear of the aerosol generating substrate and slightly reducing the temperature. slope of the temperature gradient.
[004] The heat conducting element in the smoking article of WO-A2-2009/022232 transfers the heat generated during combustion from the combustible heat source to the conduction aerosol forming substrate. The heat sink exerted by conductive heat transfer significantly reduces the backside temperature of the fuel heat source so that the backside temperature is retained significantly below its auto-ignition temperature.
[005] In smoking articles where tobacco is heated rather than combusting, the temperature obtained in the aerosol forming substrate significantly impacts the ability to generate a sensory acceptable aerosol. Generally, it is desirable to maintain the temperature of the aerosol forming substrate within a certain range in order to optimize aerosol delivery to the user. In certain cases, radiant heat losses from the outer surface of a heat conducting element around and in direct contact with the combustible heat source and the aerosol forming substrate can cause the combustible heat source temperature and the aerosol forming substrate falls and exceeds a desired range, thereby impacting the performance of the smoking article. If the temperature of the aerosol forming substrate drops too much, for example, it adversely impacts the consistency and amount of aerosol dispensed to the user.
[006] In some heated smoking articles, forced convective heat transfer from a combustible heat source to the aerosol forming substrate is provided, in addition to conductive heat transfer via the heat conducting element. For example, in some known heated smoking articles, one or more air flow channels are provided via the combustible heat source to provide forced convective heating of the aerosol forming substrate. In such smoking articles, the aerosol forming substrate is heated by a combination of conductive heating and forced convective heating. For example, WO-A2-2009/022232 describes providing at least one longitudinal air flow channel through the combustible heat source to provide a controlled amount of forced convective heating of the aerosol forming substrate.
[007] In known smoking articles where the heat transfer from the fuel heat source to the aerosol forming substrate occurs primarily by forced convection, the forced convective heat transfer and therefore the temperature of the aerosol forming substrate may vary considerably depending on a user's blowing behavior. As a result, the composition and therefore the sensory properties of the main aerosol generated by such known heated smoking articles can disadvantageously be highly sensitive to a user's puff regime.
[008] In particular, in known smoking articles comprising one or more air flow channels along the combustible heat source, direct contact between inhaled air through one or more air flow channels and the combustible heat source during blowing by a user results in activation of combustion of the combustible heat source. Intense blowing regimes can therefore lead to convective heat transfers high enough to cause spikes in the temperature of the aerosol forming substrate, disadvantageously leading to pyrolysis and even potential localized combustion of the aerosol forming substrate. As used herein, the term "peak" is used to describe a brief increase in the temperature of the aerosol forming substrate. As a result, the levels of unwanted pyrolytic and combustion residues in the main aerosols generated by such known smoking articles can also, and disadvantageously, vary significantly depending on the specific puff regime adopted by a user.
[009] In other heated smoking articles, no air flow channels are provided by the combustible heat source. In such smoking articles, heating of the aerosol-forming substrate is achieved primarily by means of conductive heat transfer via a heat-conducting element. In heated smoking articles, where the aerosol forming substrate is heated primarily by means of conductive heat transfer, the temperature of the aerosol forming substrate may become more sensitive to changes in the temperature of the heat conducting element. This means that any cooling of the heat conducting element around and in direct contact with the combustible heat source and the aerosol forming substrate due to radiant heat loss in such heated smoking articles can have a greater impact on the generation of aerosol than in heated smoking articles where the aerosol forming substrate is also heated by forced convective heat transfer.
It is known to include additives in the combustible heat sources of heated smoking articles in order to improve the ignition and combustion properties of the combustible heat sources. However, the inclusion of ignition and combustion additives can give rise to decomposition and reaction products which can disadvantageously enter the air drawn through such known smoking articles during use thereof.
To facilitate aerosol formation, the aerosol forming substrates of heated smoking articles typically comprise a polyhydric alcohol, such as glycerin, or other known aerosol former. During storage and smoking, such aerosol formers may migrate from the aerosol forming substrates of known smoking articles to the combustible heat sources thereof. Migration of aerosol formers to the combustible heat sources of known heated smoking articles can disadvantageously lead to decomposition of the aerosol formers, especially during smoking of these heated smoking articles.
[0012] It would be desirable to provide a heated smoking article that includes a combustible heat source with rear and front faces opposite each other and an aerosol forming substrate downstream of the rear face of the combustible heat source for providing improved smoking performance . Particularly, it would be desirable to provide a heated smoking article in which there is improved control of the heating of the aerosol forming substrate in order to assist in maintaining the temperature of the aerosol forming substrate within a desired temperature range during the act of smoke.
[0013] According to the invention, there is provided a smoking article comprising: a combustible heat source with rear and front faces opposite each other; an aerosol forming substrate downstream of the rear face of the combustible heat source; a first heat-conducting element comprising one or more radially inner layers of heat-conductive material superimposed on a rear portion of the combustible heat source; and a second heat-conductive element comprising one or more radially outer layers of heat-conductive material superimposed on at least a portion of the aerosol forming substrate. One or more radially outer layers of heat-conductive material are not superimposed on one or more of the radially inner layers of heat-conductive material.
[0014] As used herein, the terms "upstream", "downstream", "proximal", "distal", "frontier" and "rear", are used to describe the relative positions of components, or portions of components of the smoking article in relation to the sense in which the user brings the smoking article during use thereof. Smoking articles according to the invention comprise a proximal end through which, when in use, an aerosol leaves the smoking article for delivery to a user. The proximal end may also be referred to as the mouth end. In use, a user brings on the proximal end of the smoking article in order to inhale an aerosol generated by the smoking article.
[0015] The combustible heat source is located at or near the distal end. The mouth end is downstream from the distal end. The proximal end may also be referred to as the downstream end of the smoking article, and the distal end may also be referred to as the upstream end of the smoking article. Components or component parts of smoking articles according to the invention may be described as being upstream or downstream of each other based on their relative positions between the proximal end and the distal end of the smoking article.
[0016] The front face of the combustible heat source is at the upstream end of the combustible heat source. The upstream end of the combustible heat source is the end of the combustible heat source furthest from the proximal end of the smoking article. The rear face of the combustible heat source is at the downstream end of the combustible heat source. The downstream end of the combustible heat source is the end of the combustible heat source closest to the proximal end of the smoking article.
[0017] As used herein, the term "aerosol-forming substrate" is used to describe a substrate capable of releasing, upon heating, volatile compounds that can form an aerosol. Aerosols generated from aerosol forming substrates of smoking articles according to the invention may be visible or invisible and may include vapors (e.g. fine particles of substances which are in a gaseous state and which are normally liquid or solid at room temperature ), as well as gases and liquid droplets of condensed vapors.
[0018] The aerosol forming substrate can be in the form of a plug or segment that comprises a material capable of releasing, upon heating, volatile compounds, which can form an aerosol, circumscribed by an envelope. Where an aerosol forming substrate is in the form of such a plug or segment, the entirety of the plug or segment, including the housing, is considered to be the aerosol forming substrate.
[0019] The first heat-conducting element comprises one or more radially inner layers of heat-conductive material, and the second heat-conductive element comprises one or more radially outer layers of heat-conductive material.
[0020] As used in this document, the terms "radially external(s)" and "radially internal(s)" are used to indicate the radial distance between the longitudinal axis of the smoking article and a one or more radially outer layers of heat-conductive material of the second heat-conducting element is greater than the radial distance between the longitudinal axis of the smoking article and one or more radially inner layers of heat-conductive material of the first heat-conductive element.
As used herein, the term "longitudinal" is used to describe the direction between the proximal end and the opposite distal end of the smoking article.
[0022] As used herein, the term "radial" is used to describe the direction perpendicular to the direction between the proximal end and the opposite distal end of the smoking article.
[0023] As used herein, the term "length" is used to describe the maximum longitudinal dimension of the smoking article. That is, the maximum dimension in the direction between the proximal end and the opposite distal end of the smoking article.
[0024] Smoking articles according to the invention comprise a first heat-conducting element comprising one or more radially inner layers of heat-conductive material superimposed on a rear portion of the combustible heat source and a second heat-conducting element comprising one or more radially outer layers of heat-conductive material superimposed on at least a portion of the aerosol-forming substrate. One or more radially outer layers of heat-conductive material of the second heat-conducting element do not overlap with one or more radially inner layers of heat-conductive material of the first heat-conductive element.
[0025] In smoking articles according to the invention, there is no direct contact between one or more radially outer layers of heat-conductive material of the second heat-conducting element and one or more radially inner layers of heat-conductive material of the first heat-conducting element. This limits or inhibits conductive heat transfer from the first heat-conducting element to the second heat-conducting element. As used in this document, the term "direct contact" is used to mean direct contact between two components without any intermediate material, so that the surfaces of the components touch each other.
[0026] The inclusion of a second heat-conducting element comprising one or more radially outer layers of heat-conductive material advantageously substantially reduces radiant heat losses from outer surfaces of smoking articles according to the invention compared to articles for smoking of the type disclosed in WO-A2-2009/022232 comprising a heat-conducting element and a sleeve radially aligned downstream and spaced from the heat-conducting element.
[0027] In reducing radiant heat losses from external surfaces of smoking articles, in accordance with the invention, the inclusion of a second heat-conducting element comprising one or more radially external layers of heat-conductive material advantageously improves the control over the drain and distribution of heat from the combustible heat source to the aerosol forming substrate of smoking articles in accordance with the invention. In particular, in reducing radiant heat losses from outer surfaces of smoking articles, in accordance with the invention, the inclusion of a second heat-conductive element comprising one or more radially outer layers of heat-conductive material helps better maintenance the temperature of the aerosol forming substrate within a desired temperature range.
[0028] The inclusion of a second heat-conductive element comprising one or more radially outer layers of heat-conductive material improves the aerosol generation of the aerosol-forming substrate. Advantageously, the inclusion of a second heat-conductive element comprising one or more radially outer layers of heat-conductive material increases the total aerosol delivery to a user. Specifically, it can be seen that where an aerosol-forming substrate comprises nicotine, the delivery of nicotine to a user can be significantly improved by including a second heat-conducting element comprising one or more radially outer layers of heat conductive material. Furthermore, it has been shown that the inclusion of a second heat-conducting element comprising one or more radially outer layers of heat-conductive material advantageously extends the life of the smoking article so that a user can take a greater number of puffs. .
[0029] The improvement in the temperature profile of smoking articles, according to the invention, obtained by including a second heat-conducting element comprising one or more radially outer layers of heat-conductive material is particularly beneficial for smoking articles. according to the invention, wherein substantially no heat transfer by forced convection.
[0030] One or more radially inner layers of heat-conducting material of the first heat-conducting element may overlap a rear portion of the fuel heat source and at least a front portion of the aerosol forming substrate. In such embodiments, one or more radially outer layers of heat-conductive material from the second heat-conducting element overlap at least a rear portion of the aerosol-forming substrate.
[0031] Alternatively, one or more radially inner layers of heat-conducting material of the first heat-conducting element may only overlap a rear portion of the combustible heat source. In such embodiments, one or more radially outer layers of heat-conductive material from the second heat-conducting element may overlap only a portion of the aerosol-forming substrate or the entire length of the aerosol-forming substrate.
[0032] In certain embodiments, one or more radially inner layers of heat-conducting material of the first heat-conducting element may overlap a rear portion of the fuel heat source, and one or more radially outer layers of heat-conductive material of the second conductive element of heat can overlap the entire length of the aerosol forming substrate.
[0033] In smoking articles according to the invention, one or more radially outer layers of heat-conductive material of the second heat-conductive element are downstream of one or more radially inner layers of heat-conductive material of the first conductive element of heat.
[0034] One or more radially outer layers of heat-conductive material of the second heat-conducting element may be immediately downstream of one or more radially inner layers of heat-conductive material of the first heat-conductive element. In such embodiments, the upstream ends of one or more radially outer layers of heat-conducting material of the second heat-conducting element are substantially longitudinally aligned with the downstream ends of one or more radially inner layers of heat-conductive material of the first element. heat conductor.
[0035] Alternatively, one or more radially outer layers of heat-conductive material of the second heat-conductive element may be longitudinally spaced from one or more radially inner layers of heat-conductive material of the first heat-conductive element. In such embodiments, the upstream ends of one or more radially outer layers of heat-conducting material of the second heat-conducting element are substantially spaced longitudinally from the downstream ends of one or more radially inner layers of heat-conductive material of the first conductive element. of heat.
[0036] For example, the upstream ends of one or more radially outer layers of heat-conductive material of the second heat-conductive element and the downstream ends of one or more radially inner layers of heat-conductive material of the first heat-conductive element heat can be spaced longitudinally by about 0.5 mm and about 4 mm.
[0037] The first heat-conducting element may include a radially inner layer of heat-conductive material surrounding and in direct contact with a rear portion of the combustible heat source. In such embodiments, the rear portion of the combustible heat source is circumscribed by and is in direct contact with the radially inner layer of heat-conducting material of the first heat-conducting element.
[0038] In certain embodiments, the first heat-conducting element may comprise a radially inner layer of heat-conductive material around and in direct contact with a rear portion of the fuel heat source and at least a front portion of the fuel-forming substrate. aerosol. In such embodiments, the rear portion of the combustible heat source is circumscribed by and is in direct contact with the radially inner layer of heat-conducting material of the first heat-conducting element, and at least a front portion of the heat-forming substrate. aerosol is circumscribed by and is in direct contact with the radially inner layer of heat-conducting material of the first heat-conducting element. In such embodiments, the first heat conducting element provides thermal connection between the combustible heat source and an aerosol forming substrate of smoking articles in accordance with the invention.
[0039] In other embodiments, one or more radially inner layers of heat-conducting material of the first heat-conducting element may be radially separated from the combustible heat source. As used in this document, the term "radially separated(s)" is used to indicate that one or more radially inner layers of heat-conducting material of the first heat-conducting element are spaced from the combustible heat source in a radial direction. , so that there is no direct contact between one or more radially inner layers of heat-conducting material of the first heat-conducting element and the combustible heat source.
[0040] The first heat-conducting element and the second heat-conducting element may be radially separated by one or more layers of heat-insulating material. Suitable heat insulating materials include, but are not limited to, paper, ceramic and metal oxides.
[0041] In such arrangements, one or more layers of heat-insulating material overlying at least a portion of the first heat-conducting element underlie at least a portion of the second heat-conductive element. In certain embodiments, the first heat-conducting element and the second heat-conducting element may be radially separated by one or more layers of heat-insulating material which overlaps the entire length of the first heat-conducting element and underlies the entire length of the second heat-conducting element.
[0042] For example, the first heat-conducting element may be covered by a wrapping that circumscribes the smoking article along at least part of its length. In such embodiments, the wrapper is wrapped around the smoking article along the first heat-conducting element and the second heat-conducting element is then provided over at least a portion of the wrapper.
[0043] In certain preferred embodiments, the second heat-conducting element is provided on the outside of the smoking article so that the second heat-conducting element is visible on the outside of the smoking article. In certain preferred embodiments, a radially outer layer of heat-conductive material of the second heat-conducting element is provided on the outside of the smoking article so that the radially outer layer of heat-conductive material of the second heat-conducting element is visible in the outside of the smoking article.
[0044] Alternatively, an outer casing extending over all or only a part of the smoking article may be provided over the second heat-conducting element, so that the second heat-conducting element is not visible, i.e. only partially visible on the outside of the smoking article.
[0045] The provision of the second heat-conducting element on a casing of the smoking article can provide benefits with respect to the appearance of smoking articles according to the invention, especially during and after consumption thereof. In certain cases, some discoloration of the casing in the region of the combustible heat source may be observed when the casing is exposed to heat from the combustible heat source. The wrapper may further exhibit discoloration as a result of migration of volatile compounds from the aerosol forming substrate to the wrap around and downstream of the aerosol forming substrate. In certain embodiments, one or more radially outer layers of heat-conductive material from the second heat-conducting element may be provided over the shell around at least a portion of the aerosol forming substrate so that discoloration of the shell is covered and no longer visible, that is, less visible. In certain embodiments, one or more radially outer layers of heat-conductive material from the second heat-conducting element may extend around the entire length of the aerosol-forming substrate. In certain preferred embodiments, one or more radially outer layers of heat-conductive material from the second heat-conductive element may extend downstream beyond the aerosol forming substrate. The initial appearance of the smoking article can therefore be retained during the act of smoking.
[0046] The first heat-conducting element is preferably resistant to combustion. In certain embodiments, the first heat-conducting element is oxygen-restricting. In such embodiments, the first heat-conducting element inhibits or resists the passage of oxygen through the first heat-conducting element to a combustible heat source.
[0047] The first heat-conducting element may extend around all or part of the circumference of the smoking article. Preferably, the first heat-conducting element forms a continuous sleeve that closely circumscribes a rear portion of the combustible heat source.
[0048] In certain embodiments, the first heat-conducting element may form a continuous sleeve that closely circumscribes a rear portion of the fuel heat source and a front portion of the aerosol forming substrate. In such embodiments, the first heat conducting element can provide a substantially hermetically sealed connection between the combustible heat source and the aerosol forming substrate. This can advantageously prevent or inhibit flue gases from the combustible heat source from being readily drawn into the aerosol forming substrate through its periphery. Such a connection may also advantageously minimize or substantially prevent the transfer of convective heat from the fuel heat source to the aerosol forming substrate by air drawn along the peripheries of the fuel heat source and the aerosol forming substrate.
[0049] Preferably, the physical integrity of the first heat-conducting element is maintained at temperatures reached by the combustible heat source during ignition and combustion. In embodiments where the first heat conducting element provides a substantially hermetically closed connection between the fuel heat source and the aerosol forming substrate, this advantageously assists in maintaining a hermetically closed connection during use of the article to smoke.
[0050] One or more radially inner layers of heat-conducting material of the first heat-conducting element may comprise any suitable heat-conductive material or combination of materials with appropriate thermal conductivity.
[0051] Preferably, one or more radially inner layers of heat-conducting material of the first heat-conducting element comprise heat-conducting materials with large volume thermal conductivity between about 10 W per meter Kelvin (W/(m^K)) and about 500 W per meter Kelvin (W/(m^K)), more preferably between about 15 W per meter Kelvin (W/(m^K)) and about 400 W per meter Kelvin (W/(m) ^K)), at 23 °C and a relative humidity of 50% as measured using the Modified Transient Plane Source (MTPS) method. Suitable heat conductive materials include, but are not limited to, sheet metal casings such as, for example, aluminum foil casings, steel casings, iron sheet casings and copper foil casings; and metal alloy sheet casings.
[0052] In certain preferred embodiments, the first heat-conducting element comprises one or more layers of aluminum.
[0053] The first heat-conducting element may be composed of a single layer of heat-conductive material. Alternatively to this, the first heat-conductive element may be composed of a multi-layer or laminated material which comprises at least one layer of heat-conductive material in combination with one or more heat-conductive layers or non-heat-conductive layers. In such embodiments, the at least one layer of heat-conductive material can comprise any of the heat-conductive materials listed above.
[0054] In certain embodiments, the first heat-conducting element may be composed of a laminated material comprising at least one layer of heat-conductive material and at least one layer of heat-insulating material. In such embodiments, the inner layer of the first heat-conducting element facing the rear of the combustible heat may be a layer of heat-conductive material.
[0055] An example of a laminated material particularly suitable for forming the first heat-conducting element is a double-layer laminated material comprising an outer layer of paper and an inner layer of aluminium.
[0056] Preferably, the thickness of the first heat conducting element is between about 5 microns and about 100 microns, more preferably between about 10 microns and about 50 microns, even more preferably between about 10 microns and about 30 microns microns and more preferably about 20 microns. In certain preferred embodiments, the first heat-conducting element comprises aluminum foil having a thickness of about 20 microns.
[0057] Preferably, the rear portion of the combustible heat source surrounded by one or more radially inner layers of heat-conducting material of the first heat-conducting element is between about 2 mm and about 8 mm in length, more preferably between about 3 mm and about 5 mm long.
[0058] Preferably, the front of the combustible heat source not surrounded by one or more radially inner layers of heat-conducting material of the first heat-conducting element is between about 4 mm and about 15 mm in length, more preferably between about 5mm and about 8mm long.
[0059] In embodiments in which the first heat-conducting element comprises one or more radially inner layers of heat-conductive material around a rear portion of the fuel heat source and a front portion of the aerosol forming substrate, the substrate of The aerosol formation preferably extends at least about 3 mm downstream beyond one or more radially inner layers of heat-conducting material of the first heat-conductive element. More preferably, the aerosol forming substrate extends between about 3mm and about 10mm downstream beyond one or more radially inner layers of heat-conducting material of the first heat-conducting element. More preferably, the aerosol-forming substrate extends between about 5 mm and about 8 mm downstream beyond one or more radially inner layers of heat-conductive material of the first heat-conducting element.
[0060] In such embodiments, the front portion of the aerosol forming substrate surrounded by one or more radially inner layers of heat-conducting material of the first heat-conducting element is preferably between about 1 mm and about 10 mm in length, more preferably between about 2 mm and about 8 mm in length, and most preferably between about 2 mm and about 6 mm in length.
[0061] The second heat-conducting element may extend around all or part of the circumference of the smoking article. Preferably, the second heat conducting element forms a continuous sleeve that circumscribes at least a portion of the aerosol forming substrate.
[0062] One or more radially outer layers of heat-conducting material of the second heat-conducting element may comprise any suitable heat-conductive material or combination of materials with appropriate thermal conductivity.
[0063] Preferably, one or more radially outer layers of heat-conducting material of the second heat-conducting element comprise heat-conducting materials with large volume thermal conductivity between about 10 W per meter Kelvin (W/(m^K)) and about 500 W per meter Kelvin (W/(m^K)), more preferably between about 15 W per meter Kelvin (W/(m^K)) and about 400 W per meter Kelvin (W/(m) ^K)), at 23 °C and a relative humidity of 50% as measured using the Modified Transient Plane Source (MTPS) method. Suitable heat conductive materials include, but are not limited to, sheet metal casings such as, for example, aluminum foil casings, steel casings, iron sheet casings and copper foil casings; and metal alloy sheet casings.
[0064] In certain preferred embodiments, the second heat-conducting element comprises one or more layers of aluminum.
[0065] One or more radially inner layers of heat-conducting material of the first heat-conducting element and one or more radially outer layers of heat-conductive material of the second heat-conductive element may comprise the same heat-conducting material or materials or material or different materials.
[0066] Preferably, one or more radially outer layers of heat-conducting material of the second heat-conducting element comprise a metal reflective material such as aluminum or steel. In such embodiments, in use, one or more radially outer layers of heat-conductive material of the second heat-conductive element advantageously reflect heat radiating from the aerosol-forming substrate back to the aerosol-forming substrate.
[0067] As used in this document, the term "heat reflective material" refers to a material that has relatively high heat reflectivity and relatively low heat emissivity, so that the material reflects a greater proportion of incident radiation from the surface than the emitted proportion. Preferably, the heat-reflecting material reflects more than 50% incident radiation, more preferably more than 70% incident radiation and most preferably more than 75% incident radiation.
[0068] In such embodiments, the relatively high heat reflectivity and relatively low heat emissivity of one or more radially outer layers of heat conducting material of the second heat conducting element reduce heat losses from the aerosol forming substrate.
[0069] The reflectivity of one or more radially outer layers of heat-conducting element of the second heat-conducting element can be improved by providing one or more radially outer layers of heat-conductive material of the second heat-conducting element with a glossy inner surface, where the inner surface is the surface that faces the aerosol forming substrate.
[0070] The second heat-conducting element may be composed of a single layer of heat-conductive material. Alternatively to this, the second heat-conductive element can be composed of a multi-layer or laminated material which comprises at least one layer of heat-conductive material in combination with one or more heat-conductive layers or non-heat-conductive layers. In such embodiments, the at least one layer of heat-conductive material can comprise any of the heat-conductive materials listed above.
[0071] In certain preferred embodiments, the second heat-conducting element can be formed of a laminated material comprising at least one layer of heat-conductive material and at least one layer of heat-insulating material. In such embodiments, the inner layer of the second heat-conducting element facing the aerosol-forming substrate may be a layer of heat-insulating material.
[0072] In certain preferred embodiments, the second heat-conducting element comprises a single layer of heat-conductive material.
[0073] In certain preferred embodiments, the second heat-conducting element is a laminated material comprising a single layer of heat-conductive material and one or more layers of heat-insulating materials. In certain particularly preferred embodiments, the second heat-conducting element is a laminated material comprising a single layer of heat-conductive material and a single layer of heat-insulating material. Preferably, the second heat-conducting element is a laminated material comprising a single outer layer of heat-conductive material and a single inner layer of heat-insulating material.
[0074] An example of a laminated material particularly suitable for forming the second heat-conducting element is a double-layer laminated material comprising an outer layer of aluminum and an inner layer of paper.
[0075] The use of a second heat-conducting element comprising a laminated material may also be beneficial during the production of smoking articles according to the invention, as at least one layer of heat-insulating material can provide strength and rigidity additional. This allows the laminated material to be processed more easily, with reduced risk of collapse or breakage of at least one layer of heat-conducting material, which can be relatively thin and brittle.
[0076] The thickness of the second heat-conducting element can be substantially identical to the thickness of the first heat-conducting element. Alternatively, the first heat-conducting element and the second heat-conducting element can have different thicknesses from each other.
[0077] Preferably, the thickness of the second heat conducting element is between about 5 microns and about 100 microns, more preferably between about 10 microns and about 80 microns.
[0078] Preferably, the second heat-conducting element comprises one or more radially outer layers of heat-conductive material with a thickness between about 2 microns and about 50 microns, more preferably between about 5 microns and about 30 microns, even more preferably, between about 5 microns and about 20 microns.
[0079] In certain preferred embodiments, the second heat-conducting element may comprise aluminum foil with a thickness of about 20 microns.
[0080] In certain preferred embodiments, the second heat-conducting element may comprise a laminated material comprising an outer layer of aluminum with a thickness between about 2 microns and about 20 microns, more preferably between about 4 microns and about 10 microns, more preferably between about 5 microns and about 8 microns, and an inner layer of paper.
[0081] The position and extent of the second heat-conducting element relative to the first heat-conducting element and the aerosol forming substrate can be adjusted in order to control the heating of the aerosol forming substrate during smoking.
[0082] In certain embodiments, the second heat-conducting element may comprise one or more radially outer layers of heat-conductive material superimposed over the entire length of the aerosol forming substrate. In such embodiments, the downstream ends of one or more radially outer layers of heat-conductive material of the second heat-conducting element may be aligned with the downstream end of the aerosol forming substrate. Alternatively, one or more radially outer layers of heat-conductive material from the second heat-conducting element may extend beyond the aerosol-forming substrate in the downstream direction.
[0083] In other embodiments, the second heat-conducting element may comprise one or more radially outer layers of heat-conductive material that overlap only a rear portion of the aerosol forming substrate.
Smoking articles according to the invention may comprise a blunt combustible heat source or an unblind combustible heat source.
[0085] As used in this document, the term "blind" is used to describe a combustible heat source in which there is no air flow channel that extends from the front face to the back face of the combustible heat source.
[0086] In use, air drawn through smoking articles according to the invention comprising a blind combustible heat source for inhalation by a user does not pass through any air flow channel along the combustible heat source blind. In smoking articles according to the invention which comprise a blind combustible heat source, heating of the aerosol forming substrate occurs primarily by conduction, and heating of the aerosol forming substrate by forced convection is minimized or reduced.
[0087] As used herein, the term "airflow channel" is used to describe a channel that extends along the length of a combustible heat source through which air can be drawn downstream for inhalation by the user.
[0088] As used in this document, the term "unblinded" is used to describe a combustible heat source in which there are one or more air flow channels that extend from the front face to the rear face of the source of fuel. combustible heat.
[0089] In use, air drawn through smoking articles according to the invention comprising an unblinded combustible heat source for inhalation by a user passes through one or more air flow channels along the source of combustible heat does not blind. In smoking articles according to the invention comprising an unblinded combustible heat source, heating of the aerosol forming substrate takes place by conduction and by forced convection.
[0090] When smoking articles according to the invention comprise a non-blind combustible heat source, the absence of any air flow channels through the blind combustible heat source substantially and advantageously prevents or inhibits the activation of combustion of the blinds combustible heat source during blows by a user.
[0091] Preventing or inhibiting the activation of combustion of the combustible heat source during puffing by a user advantageously prevents or substantially inhibits spikes in the temperature of the aerosol forming substrate during puffing by a user. By preventing or inhibiting the combustion activation of the combustible heat source and thereby preventing or inhibiting excessive temperature increases in the aerosol forming substrate, the combustion or pyrolysis of the aerosol forming substrate of smoking articles in accordance with invention under intense blowing regimes can advantageously be avoided. Furthermore, the impact of a user's puff regimen on the main aerosol composition of smoking articles according to the invention can advantageously be minimized or reduced.
It is known to include additives in the combustible heat sources of heated smoking articles in order to improve the ignition and combustion properties of the combustible heat sources. However, the inclusion of ignition and combustion additives can give rise to decomposition and reaction products, which can disadvantageously enter the inhaled air through such known smoking articles during use thereof.
[0093] The inclusion of a blind combustible heat source may also substantially, and advantageously, inhibit or prevent combustion and decomposition products and other materials formed during ignition and combustion of the blind combustible heat source from entering the entrained air through the smoking articles according to the invention during use thereof. This is particularly advantageous where the blind combustible heat source comprises one or more additives to assist in igniting the blind combustible heat source.
[0094] In smoking articles according to the invention which comprise a blind combustible heat source, it is particularly important to optimize the conductive heat transfer between the combustible heat source and the aerosol forming substrate. It has been found that the inclusion of a first heat-conducting element comprising one or more radially inner layers of heat-conductive material superimposed on a rear portion of the fuel heat source and a second heat-conductive element comprising one or more radially outer layers of heat-conductive material superimposed on at least a portion of the aerosol-forming substrate, wherein one or more radially outer layers of heat-conductive material do not overlap one or more radially inner layers of heat-conductive material, has a particularly effect. advantageous over the smoking performance of smoking articles, including blind heat sources, where there is little, if any, heating of the aerosol forming substrate by forced convection.
[0095] It should be noted that smoking articles according to the invention may comprise blunt combustible heat sources comprising one or more passageways through which air may not be drawn in upon inhalation by a user.
[0096] For example, smoking articles according to the invention may comprise blind heat sources comprising one or more closed passages extending from the rear face at the upstream end of the blind combustible heat source to only half of the length of the blind combustible heat source.
[0097] The inclusion of one or more closed air passages increases the surface area of the blind combustible heat source that is exposed to oxygen in the air and can advantageously facilitate continued combustion ignition of the blind combustible heat source.
[0098] Alternatively, smoking articles according to the invention may comprise an unblinded combustible heat source in which there are one or more air flow channels extending from the front face to the rear face of the unblinded combustible heat source.
[0099] The one or more airflow channels may comprise one or more attached airflow channels.
[00100] As used in this document, the term "attached" is used to describe air flow channels that extend through the interior of the non-blind combustible heat source and are surrounded by the non-blind combustible heat source.
[00101] Alternatively, or in addition to, the one or more airflow channels may comprise one or more unclosed airflow channels. For example, the one or more air flow channels may comprise one or more grooves or further unclosed air flow channels extending along the exterior of the unblinded combustible heat source.
[00102] The one or more airflow channels may include one or more closed airflow channels or one or more unclosed airflow channels or a combination thereof.
[00103] In some embodiments, smoking articles according to the invention may comprise one, two or three air flow channels extending from the front face to the rear face of the unblinded combustible heat source.
[00104] In certain preferred embodiments, smoking articles in accordance with the invention comprise a single air flow channel extending from the front face to the rear face of the unblinded combustible heat source.
[00105] In certain especially preferred embodiments, smoking articles in accordance with the invention comprise a single substantially central or axial air flow channel extending from the front face to the rear face of the unblinded combustible heat source.
[00106] In such embodiments, the diameter of the single airflow channel is preferably between about 1.5 mm and about 3 mm.
[00107] It should be noted that, in addition to the one or more air flow channels through which air can be drawn in for inhalation by a user, smoking articles according to the invention may comprise combustible heat sources not blinds comprising one or more closed or blocked passages through which air cannot be drawn in for inhalation by the user.
[00108] For example, smoking articles according to the invention may comprise non-blind heat sources comprising one or more air flow channels extending from the front face to the rear face of the combustible heat source and one or more pathways passageways extending from the front face of the combustible heat source do not blind to only half the length of the combustible heat source.
[00109] The inclusion of one or more closed air passages increases the surface area of the unblinded combustible heat source that is exposed to oxygen in the air and can advantageously facilitate the continued combustion ignition of the unblinded combustible heat source.
Smoking articles according to the invention comprising a non-blinding non-combustible heat source further comprise a substantially air-impermeable non-combustible barrier between the non-blinding combustible heat source and one or more extending air flow channels from the front face to the rear face of the non-blinding combustible heat source.
[00111] When smoking articles in accordance with the invention comprise an unblinded combustible heat source, the inclusion of a substantially airtight non-combustible barrier between the non-blinded combustible heat source and one or more flow channels. air extending from the front face to the rear face of the non-blinded combustible heat source advantageously prevents or substantially inhibits activation of combustion of the non-blinded combustible heat source during blowing by a user.
[00112] Preventing or inhibiting the activation of combustion of the combustible heat source during the act of blowing by a user advantageously prevents or substantially inhibits peaks in the temperature of the aerosol forming substrate during blowing by a user. By preventing or inhibiting the combustion activation of the combustible heat source and thereby preventing or inhibiting excessive temperature increases in the aerosol forming substrate, the combustion or pyrolysis of the aerosol forming substrate of smoking articles in accordance with invention under intense blowing regimes can advantageously be avoided. Furthermore, the impact of a user's puff regimen on the main aerosol composition of smoking articles according to the invention can advantageously be minimized or reduced.
[00113] The inclusion of a substantially airtight non-combustible barrier between the non-blinded fuel heat source and one or more air flow channels extending from the front face to the rear face of the non-blind fuel source may substantially advantageously, inhibiting or preventing combustion and decomposition products formed during ignition and combustion of the non-blinding combustible heat source from entering the puffed air into the smoking article through the one or more air flow channels as the puffed air passes through one or more airflow channels. This is particularly advantageous when the non-blinded combustible heat source comprises one or more additives to aid in the ignition or combustion of the non-blinded combustible heat source.
[00114] The barrier between the non-blind combustible heat source and one or more air flow channels may be adhered or otherwise affixed to the non-blind combustible heat source.
[00115] In certain embodiments, the barrier comprises a substantially air-impermeable non-combustible barrier coating on an inner surface of one or more airflow channels. In such embodiments, preferably the barrier comprises a barrier coating provided over at least substantially the entire internal surface of the one or more airflow channels. More preferably, the barrier comprises a barrier coating provided over the entire inner surface of the one or more airflow channels.
[00116] As used in this document, the term "cladding" is used to describe a layer of material that covers and is adhered to the combustible heat source.
[00117] In other embodiments, the barrier coating can be provided by inserting a liner inside the one or more air flow channels. For example, where the one or more air flow channels comprise one or more closed air flow channels extending into the unblinded combustible heat source, a hollow non-combustible substantially airtight tube may be inserted into each. one of the airflow channels.
[00118] Depending on the characteristics and performance desired for the smoking article, the barrier can have a low thermal conductivity or a high thermal conductivity. Preferably, the barrier has a low thermal conductivity.
[00119] The thickness of the barrier can be adjusted accordingly to achieve good smoke performance. In certain embodiments, the barrier can be between about 30 microns and about 200 microns thick. In a preferred embodiment, the barrier is between about 30 microns and about 100 microns thick.
[00120] The barrier may be formed from one or more suitable materials that are substantially thermally stable and non-combustible at the temperatures reached by the non-blind combustible heat source during ignition and combustion. Suitable materials are known in the art and include, but are not limited to, for example: clays; metal oxides such as iron oxide, alumina, titania, silica, silica-alumina, zirconia and wax; zeolites; zirconium phosphate; and other ceramic materials or combinations thereof.
[00121] Preferred materials from which the barrier can be formed include clays, glasses, aluminum, iron oxide and combinations thereof. If desired, catalytic ingredients, such as ingredients that promote the oxidation of carbon monoxide to carbon dioxide, can be incorporated into the barrier. Suitable catalytic ingredients include, but are not limited to, for example, platinum, palladium, transition metals and their oxides.
[00122] Where the barrier comprises a barrier coating provided on an inner surface of 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 the methods described in US-A-5.040.551. For example, the inner surface of the one or more airflow channels can be sprayed, moistened or painted with a solution or suspension of the barrier coating. In certain preferred embodiments, the barrier coating is applied to the inner surface of the air flow channels of one or more air flow channels by the process described in WO-A2-2009/074870 while the combustible heat source is extruded.
Smoking articles according to the invention may further comprise a non-combustible substantially air-impermeable barrier between the rear face of the combustible heat source and the aerosol forming substrate.
[00124] Where smoking articles according to the invention comprise a non-blind combustible heat source and a substantially air-impermeable non-combustible barrier between the rear face of the combustible heat source and the aerosol forming substrate, the barrier must allow that air entering the smoking article through the one or more air flow channels extending from the front face to the rear face of the unblinded combustible heat source is drawn downstream through the smoking article.
[00125] The barrier may abut either the rear face of the fuel heat source and the aerosol forming substrate, or both. Alternatively, the barrier may be spaced from either the rear face of the fuel heat source and the aerosol forming substrate, or both.
[00126] The barrier may be adhered, or otherwise affixed, to one of the rear face of the heat source and the aerosol forming substrate, or both.
[00127] In certain preferred embodiments, the barrier comprises a first substantially air-impermeable non-combustible barrier coating provided on the rear face of the combustible heat source. In such embodiments, the barrier preferably comprises a barrier coating over at least substantially the entire rear face of the combustible heat source. More preferably, the barrier comprises a barrier coating provided over the entire rear face of the combustible heat source.
[00128] The barrier can advantageously limit the temperature to which the aerosol-forming substrate is exposed during ignition or combustion of the combustible heat source, thus helping to prevent or reduce thermal degradation or combustion of the aerosol forming substrate during use of the smoking article. This is particularly advantageous where the combustible heat source comprises one or more additives to assist in igniting the combustible heat source.
[00129] To facilitate aerosol formation, the aerosol forming substrates of heated smoking articles typically comprise a polyhydric alcohol, such as glycerin, or other known aerosol former. During storage and smoking, such aerosol formers may migrate from the aerosol forming substrates of known smoking articles to the combustible heat sources thereof. Migration of aerosol formers to the combustible heat sources of known heated smoking articles can disadvantageously lead to decomposition of the aerosol formers, especially during smoking of these heated smoking articles.
[00130] The inclusion of a substantially air-impermeable non-combustible barrier between the rear face of the combustible heat source and the aerosol-forming substrate can substantially, and advantageously, prevent or inhibit the migration of components from the aerosol-forming substrate. aerosol to the combustible heat source during storage of the smoking article.
[00131] Alternatively to, or in addition, the inclusion of a substantially airtight non-combustible barrier between the rear face of the combustible heat source and the smoking article aerosol forming substrate, according to the invention, may, of advantageously prevent or substantially inhibit the migration of components from the aerosol forming substrate to the combustible heat source during use of the smoking articles.
[00132] The inclusion of a substantially air-impermeable non-combustible barrier between the rear face of the combustible heat source and the aerosol forming substrate may be particularly advantageous where the aerosol forming substrate comprises at least one aerosol former.
[00133] In such embodiments, the inclusion of a substantially airtight non-combustible barrier between the rear face of the combustible heat source and the aerosol forming substrate of smoking articles according to the invention may advantageously preventing or inhibiting migration of at least one aerosol former from the aerosol forming substrate to the combustible heat source during storage and use of the smoking article. Decomposition of at least one aerosol former during use of the smoking articles can, therefore, advantageously be substantially prevented or reduced.
[00134] Depending on the desired characteristics and performance of the smoking article, the substantially air-impermeable non-combustible barrier between the rear face of the combustible heat source and the aerosol forming substrate may have a low thermal conductivity or a high thermal conductivity. In certain embodiments, the barrier can be formed from a material that has a large volume thermal conductivity of between about 0.1 W per meter Kelvin (mW/(m«K)) and about 200 W per meter Kelvin ( mW/(m*K)), at 23°C and a relative humidity of 50%, as measured using the Modified Transient Flat Source (MTPS) method.
[00135] The thickness of the barrier can be adjusted accordingly to achieve good smoke performance. In certain embodiments, the barrier can be between about 10 microns and about 500 microns thick.
[00136] The barrier can be formed from one or more suitable materials that are substantially thermally stable and non-combustible at the temperatures reached by the combustible heat source during ignition and combustion. Suitable materials are known in the art and include, but are not limited to, clays (such as, for example, bentonite and kaolinite), glasses, minerals, ceramic materials, resins, metals and combinations thereof.
[00137] Preferred materials from which the barrier can be formed include clays and glasses. The most preferred materials from which the barrier can be formed include copper, aluminum, stainless steel, alloys, alumina (Al2O3), resins and mineral glues.
[00138] In certain embodiments, the barrier comprises a clay coating comprising a 50/50 mixture of bentonite and kaolinite provided on the rear face of the combustible heat source. In another preferred embodiment, the barrier comprises a glass coating, more preferably a sintered glass coating, provided on the rear face of the combustible heat source.
[00139] In certain particularly preferred embodiments, the barrier comprises an aluminum coating provided on the rear face of the combustible heat source.
[00140] Preferably, the barrier has a thickness of at least about 10 microns.
[00141] Due to the slight permeability of clays to air, in embodiments where the barrier comprises a clay coating provided on the rear face of the fuel heat source, the clay coating more preferably has a thickness of at least about 50 microns, and even more preferably, between about 50 microns and about 350 microns.
[00142] In embodiments where the barrier is formed from one or more air-impermeable materials, such as aluminum, the barrier may be thinner and will generally preferably have a thickness of less than about 100 microns and more, and more preferably about 20 microns.
[00143] In embodiments where the barrier comprises a glass coating provided at the rear stage of the fuel heat source, the glass coating preferably has a thickness of less than about 200 microns.
[00144] The thickness of the barrier can be measured using a microscope, a scanning electron microscope (SEM) or any other suitable measurement methods known in the art.
[00145] Where the barrier comprises a barrier coating provided on the rear face of the combustible heat source, the barrier coating may be applied so as to cover and adhere to the rear face of the combustible heat source by any suitable known methods within the art, including, but not limited to, spray coating, vapor deposition, immersion, material transfer (eg brushing or gluing), electrostatic deposition or any combination thereof.
[00146] For example, barrier coating can be made by preforming a barrier in the approximate size and shape of the rear face of the fuel heat source, and applying it to the rear face of the fuel heat source to cover and adhere at least substantially the entire rear face of the combustible heat source. Alternatively, the barrier coating can be cut or otherwise machined after its application to the rear face of the combustible heat source. In a preferred embodiment, aluminum foil is applied to the rear face of the fuel heat source by gluing or pressing it to the fuel heat source, and it is cut or otherwise tampered with so that the aluminum foil covers and adheres to at least substantially the entire rear face of the combustible heat source, preferably the rear face of the combustible heat source in its entirety.
[00147] In another preferred embodiment, the barrier coating is formed by applying a solution or suspension of one or more suitable coating materials to the external face of the combustible heat source. For example, the barrier coating can be applied to the rear face of the combustible heat source by immersing the rear face of the combustible heat source in a solution or suspension of one or more suitable coating materials or by brushing or coating. by spraying a solution or suspension or electrostatically depositing a powder or powder mixture of one or more suitable coating materials on the external face of the combustible heat source. Where a barrier coating is applied to the rear face of the fuel heat source by electrostatically depositing a powder or powder mixture of one or more suitable coating materials on the rear face of the fuel heat source, the rear face of the fuel heat source it is preferably pretreated with water glass prior to electrostatic deposition. Preferably, the barrier coating is applied by spray coating.
[00148] The barrier coating can be formed by a single application of a solution or suspension of one or more suitable coating materials to the rear face of the combustible heat source. Alternatively, the barrier coating can be formed through multiple applications of a solution or suspension of one or more suitable coating materials to the rear face of the combustible heat source. For example, the barrier coating can be formed by one, two, three, four, five, six, seven or eight successive applications of a solution or suspension of one or more suitable coating materials to the rear face of the combustible heat source.
[00149] Preferably, the barrier coating is formed by between one and ten applications of a solution or suspension of one or more suitable coating materials to the rear face of the combustible heat source.
[00150] After applying the solution or suspension of one or more coating materials to the rear face thereof, the combustible heat source can be dried to form the barrier coating.
[00151] Where the barrier coating is formed by multiple applications of a solution or suspension of one or more suitable coating materials to the rear face of the same, the combustible heat source may need to be dried between successive applications of the solution or suspension.
[00152] Alternatively to, or in addition to drying, after applying a solution or suspension of one or more coating materials to the rear face of the fuel heat source, the coating material in the fuel heat source may be sintered so to form the barrier coating. Sintering the barrier coating is particularly preferred where the barrier coating is a glass or ceramic coating. Preferably, the barrier coating is sintered at a temperature between about 500°C and about 900°C, and more preferably at about 700°C.
Smoking articles according to the invention may comprise one or more first air inlets around the periphery of the aerosol forming substrate.
As used herein, the term "air inlet" is used to describe the hole, slit, slot or other opening through which air can be drawn into the smoking article.
[00155] When smoking articles according to the invention comprise one or more first air inlets around the periphery of the aerosol forming substrate, when in use, cold air is drawn into the aerosol forming substrate of the smoking article through the first air intakes. Air drawn into the aerosol forming substrate through the first air inlets passes downstream, through the smoking article, from the aerosol forming substrate and leaves the smoking article through the proximal end thereof.
[00156] During a user's puff, cold air drawn through one or more first air inlets around the periphery of the aerosol forming substrate advantageously reduces the temperature of the aerosol forming substrate. This advantageously and substantially inhibits or inhibits spikes in substrate temperature from aerosol formation during a user's puff.
[00157] As used in this document, the term "cold air" is used to describe ambient air that is not significantly heated by the combustible heat source while the user is ingesting.
[00158] By preventing or inhibiting the temperature peaks of the aerosol forming substrate, the inclusion of one or more first air inlets around the periphery of the aerosol forming substrate advantageously helps to prevent or reduce combustion or pyrolysis of the aerosol forming substrate under intense blow regimes. Furthermore, the inclusion of one or more first air inlets around the periphery of the aerosol forming substrate advantageously helps to minimize or reduce the impact of a user puff regimen on the main aerosol composition of the smoking article.
In certain preferred embodiments, the one or more first air inlets are located in proximity to the downstream end of the aerosol forming substrate.
[00160] In certain embodiments, the aerosol forming substrate may abut the rear face of the combustible heat source or the substantially air-impermeable non-combustible barrier coating disposed on the rear face of the combustible heat source.
[00161] As used herein, the term "contiguous" is used to describe that the aerosol-forming substrate is in contact with the rear face of the combustible heat source of a substantially airtight, non-combustible barrier housing provided on the rear face of the combustible heat source.
[00162] In other embodiments, the aerosol-forming substrate may be spaced away from the rear face of the combustible heat source. That is, there may be a space or gap between the aerosol forming substrate and the rear face of the combustible heat source.
[00163] As used herein, the term "spaced" is used to describe that the aerosol forming substrate is not in contact with the rear face of the combustible heat source or with the substantially airtight non-combustible barrier coating provided on the rear face of the combustible heat source.
[00164] Alternatively or in addition to one or more first air inlets, in these embodiments, smoking articles according to the invention may additionally comprise one or more second air inlets between the rear face of the fuel heat source and the fuel substrate. aerosol formation. When in use, fresh air is drawn into the space between the combustible heat source and the aerosol forming substrate through the second air inlets. Air drawn into the space between the fuel heat source and the aerosol forming substrate through the second air inlets passes downstream through the smoking article from the space between the fuel heat source and the aerosol forming substrate and leaves the smoking article through the proximal end thereof.
[00165] During a user's puff, fresh air that is drawn in through the one or more second air inlets between the rear face of the combustible heat source and the aerosol forming substrate can advantageously reduce the temperature of the substrate of aerosol formation. This can advantageously and substantially prevent or inhibit spikes in substrate temperature from aerosol formation during a user's puff.
[00166] Alternatively, or in addition to one or more first air inlets or one or more second air inlets, smoking articles according to the invention may comprise one or more third air inlets downstream of the aerosol forming substrate .
[00167] It should be appreciated that smoking articles in accordance with the invention may comprise one or more first air inlets around the periphery of the aerosol forming substrate, or one or more second air inlets between the rear face of the aerosol source. combustible heat and the aerosol forming substrate, or one or more third air inlets downstream of the aerosol forming substrate, or a combination thereof.
[00168] The number, shape, size and location of the air inlets can be adjusted accordingly so that a good smoke performance can be achieved.
[00169] In certain embodiments comprising one or more third air inlets, preferably smoking articles according to the invention comprise an air flow directing element downstream of the aerosol forming substrate. The air flow directing element defines an air flow path through the smoking article. One or more third air inlets are preferably disposed between a downstream end of the aerosol forming substrate and a downstream end of the air flow directing element.
[00170] When in use, air is drawn into the air flow directing element through one or more third air inlets. At least a portion of the inhaled air flows upstream along the first portion of the air flow path, towards the aerosol forming substrate. Air flows through the aerosol forming substrate and then downstream along the second portion of the air flow path towards the mouth end of the smoking article.
[00171] The air flow directing element may comprise a hollow body substantially impermeable to air and with an open end. In such embodiments, air drawn in through the one or more third air inlets is first drawn upstream, preferably along an outer portion of the substantially airtight open-ended hollow body, and then downstream from preferably, through the interior of the substantially airtight, open-ended hollow body.
[00172] The substantially air-impermeable hollow body may be made from one or more suitable air-impermeable materials that are substantially thermally stable at the temperature of the aerosol generated by transferring heat from the heat source to the aerosol forming substrate. Suitable materials are known in the art and include, but are not limited to, cardboard, plastic, ceramic and combinations thereof.
[00173] In a preferred embodiment, the substantially air-tight and open-ended hollow body is a cylinder, preferably a straight circular cylinder.
[00174] In another preferred embodiment, the hollow body substantially impermeable to air and with an open end is a truncated cone, preferably a straight circular truncated cone.
The substantially airtight, open-ended hollow body may have a length of between about 7 mm and about 50 mm, for example a length of between about 10 mm and about 45 mm or between about 15 mm and about 30 mm. The air flow directing element may have other lengths, depending on the overall desired length of the smoking article, and the presence and length of other components within the limits of the smoking article.
[00176] Where the substantially airtight, open-ended hollow body is a cylinder, the cylinder may have a diameter of between 2 mm and about 5 mm, for example a diameter of between about 2.5 m and about 4 .5 mm. The cylinder may have other diameters depending on the desired overall diameter of the smoking article.
[00177] When the substantially airtight, open-ended hollow body is a truncated cone, the upstream end of the truncated cone may have a diameter between about 2 mm and about 5 mm, for example a diameter between about 2 .5 mm and about 4.5 mm. The upstream end of the truncated cone may have other diameters depending on the desired overall diameter of the smoking article.
[00178] When the substantially airtight open-ended hollow body is a truncated cone, the downstream end of the truncated cone may have a diameter between about 5 mm and about 9 mm, for example, between about 7 mm and about 8mm. The downstream end of the truncated cone may have other diameters depending on the overall desired diameter of the smoking article. Preferably, the downstream end of the truncated cone is substantially the same diameter as the aerosol forming substrate.
The hollow body substantially impermeable to air and with an open end may adjoin the aerosol forming substrate. Alternatively, the substantially airtight, open-ended hollow body may extend into the aerosol forming substrate. For example, in certain embodiments, the open-ended, substantially airtight hollow body may extend a distance of up to 0.5 L into the aerosol forming substrate, where L is the length of the aerosol forming substrate.
[00180] The upstream end of the substantially airtight hollow body has reduced diameter compared to the aerosol forming substrate.
[00181] In certain embodiments, the downstream end of the substantially airtight hollow body has reduced diameter compared to the aerosol forming substrate.
[00182] In certain embodiments, the downstream end of the open-ended, substantially airtight hollow body has substantially the same diameter as the aerosol forming substrate.
[00183] When the downstream end of the hollow substantially airtight body has reduced diameter compared to the aerosol forming substrate, the hollow substantially airtight body may be circumscribed by a substantially airtight seal. In such embodiments, the substantially airtight seal is located downstream of one or more third air inlets. The substantially air-impermeable seal may have substantially the same diameter as the aerosol forming substrate. For example, in some embodiments, the downstream end of the open-ended, substantially airtight hollow body may be circumscribed by a substantially impermeable plug or washer having substantially the same diameter as the aerosol forming substrate.
The substantially air-impermeable seal may be formed from one or more suitable air-impermeable materials that are substantially thermostable at the temperature of the aerosol generated by transferring heat from the fuel heat source to the aerosol forming substrate. Suitable materials are known in the art and include, but are not limited to, cardboard, plastic, wax, silicone, ceramic and combinations thereof.
[00185] At least a portion of the length of the substantially air-tight, open-ended hollow body may be circumscribed by an air-permeable diffuser. The air permeable diffuser may have substantially the same diameter as the aerosol forming substrate. The air permeable diffuser can be formed from one or more suitable air permeable materials that are substantially thermostable at the temperature of the aerosol generated by the transfer of heat from the fuel heat source to the aerosol forming substrate. Suitable air permeable materials are known in the art and include, but are not limited to, porous materials such as, for example, cellulose acetate fiber, cotton, open cell ceramic and polymeric foams, tobacco material and combinations thereof.
[00186] In a preferred embodiment, the air flow directing element comprises a hollow tube substantially impermeable to air with an open end of reduced diameter compared to the aerosol forming substrate and a substantially impermeable annular seal with substantially the same outside diameter as the aerosol forming substrate, which circumscribes the downstream end of the hollow tube.
[00187] The air flow directing element further comprises an inner casing, which circumscribes the hollow tube and the annular seal substantially impermeable to air.
[00188] The open upstream end of the hollow tube may be contiguous with a downstream end of the aerosol forming substrate. Alternatively, the open upstream end of the hollow tube may be inserted or otherwise extend into the downstream end of the aerosol forming substrate.
[00189] The air flow directing element may further comprise an air-permeable annular diffuser with substantially the same external diameter as the aerosol forming substrate, circumscribing at least a portion of the length of the hollow tube upstream of the annular seal substantially impermeable to air. For example, the hollow tube may be at least partially embedded in a cellulose acetate fiber plug.
[00190] In another preferred embodiment, the air flow directing element comprises: a substantially air-impermeable truncated hollow cone with an upstream end with reduced diameter compared to the aerosol forming substrate and a downstream end with substantially diameter identical to that of the aerosol forming substrate.
[00191] The open upstream end of the hollow truncated cone may be contiguous with a downstream end of the aerosol forming substrate. Alternatively, the upstream upstream end of the hollow truncated cone may be inserted or otherwise extend into the downstream end of the aerosol forming substrate.
[00192] The air flow directing element may further comprise an air-permeable annular diffuser having substantially the same external diameter as the aerosol forming substrate, circumscribing at least a portion of the length of the hollow truncated cone. For example, the hollow truncated cone can be at least partially embedded in a cellulose acetate fiber plug.
[00193] In another preferred embodiment, the airflow directing element comprises an air permeable segment downstream of the aerosol forming substrate, airflow directing element defining an airflow path; and the smoking article comprises one or more third air inlets for entrained air in the air-permeable segment, the air flow path comprising a first portion and a second portion, the first portion of the air flow path extending from one or more third air inlets to the aerosol forming substrate and the second portion of the air flow path extending from the aerosol forming substrate toward the mouth end of the smoking article, at that the first portion of the airflow path is defined by a low drag-resistance portion of the air-permeable segment which extends near one or more third air inlets to an upstream end of the air-permeable segment, and the The air-permeable segment further comprises a portion with high drag resistance which extends near one or more third air inlets to a downstream end of the air-permeable segment.
[00194] As used in this document, the term "air-permeable segment" refers to a segment that is not blocked, plugged or sealed so as to completely block the passage of air through the air-permeable segment.
[00195] As described above, the ratio of drag resistance between the high drag portion to the low drag strength portion is greater than 1:1 and less than about 50:1. Preferably, the second portion of the air flow path is defined by a substantially hollow tube.
[00196] The drag resistance is measured in accordance with ISO 6565:2011 and is normally expressed in units of mmH2O. The drag resistance of the air permeable segment can be measured by the drag by one end of the air flow directing element, the second portion of the air flow path being sealed so that air flows only through the air permeable segment. of the airflow directing element. Preferably, the drag resistance of the air permeable segment is homogeneous over the length of the segment. In such embodiments, the drag resistance of the low drag-resistance portion and the high drag-resistance portion, respectively, will be proportional to their respective lengths in the air-permeable segment. In a preferred embodiment, one or more third air inlets are located towards the upstream end of the air flow directing element. Thus, drag resistance of the portion of the air-permeable segment upstream of one or more third air inlets should be less than the drag resistance of the portion of the air-permeable segment downstream of one or more third air inlets.
[00197] In other embodiments where the drag resistance of the air-permeable segment is not homogeneous along the length of the segment, the drag resistance of the low drag-resistance portion of the air-permeable segment can be measured by cutting across the element of directing the airflow at a location corresponding to one or more third air inlets closest to the upstream end of the air-permeable segment to separate the low drag-resistance portion of the air-permeable segment from the rest of the air-permeable segment , and puffing at one end of the cut low drag portion while sealing the second portion of the air flow path so that air flows only through the low drag portion of the air permeable segment . Likewise, the drag resistance of the high drag resistance portion of the air-permeable segment can be measured by cutting the air flow directing element transversely at a location corresponding to at least one air inlet closer to the end. downstream of the air-permeable segment to separate the high drag-resistance portion of the air-permeable segment from the rest of the air-permeable segment, and vacuuming at one end of the cut high drag-resistance portion while seals the second portion of the airflow path so that air flows only through the high drag-resistance portion of the air-permeable segment.
[00198] Preferably, the combustible heat source is a carbonaceous heat source. As used herein, the term "carbonaceous" is used to describe a combustible heat source that comprises carbon. Preferably, carbonaceous combustible heat sources for use in smoking articles in accordance with the invention have a carbon content of at least about 35 percent, more preferably at least about 40 percent, most preferably still of at least 45 percent by dry weight of the combustible heat source.
[00199] In some embodiments, combustible heat sources according to the invention are carbon-based combustible heat sources. As used herein, the term "carbon-based heat source" is used to describe a heat source composed primarily of carbon.
[00200] Carbon-based combustible heat sources for use in smoking articles according to the invention have a carbon content of at least about 50%. For example, carbon-based combustible heat sources for use in smoking articles according to the invention may have a carbon content of at least about 60 percent, more preferably at least about 70 percent, or at least about 70 percent. less about 80 percent of the dry weight of the carbon-based fuel heat source.
Smoking articles according to the invention may comprise carbonaceous combustible heat sources formed from one or more suitable carbon-containing materials.
[00202] If desired, one or more binders can be combined with the one or more carbon-containing materials. Preferably, the one or more binders are organic binders. Known suitable organic binders include, but are not limited to, gums (eg, guar gum), modified celluloses and cellulose derivatives (eg, methyl cellulose, carboxymethylcellulose, hydroxypropylcellulose and hydroxypropyl methylcellulose), wheat flour, starches, sugars, vegetable oils and combinations thereof.
[00203] In a preferred embodiment, the fuel heat source is formed from a mixture of carbon powder, modified cellulose, wheat flour and sugar.
[00204] Instead of or in addition to one or more binders, combustible heat sources for use in smoking articles according to the invention may comprise one or more additives in order to improve the properties of the combustible heat source. Suitable additives include, but are not limited to, additives to promote consolidation of the combustible heat source (e.g., sintering aids), additives to promote ignition of the combustible heat source (e.g., oxidizers such as perchlorates, chlorates, nitrates, peroxides, permanganates, zirconium and combinations thereof), additives to promote combustion of the combustible heat source (eg potassium and potassium salts such as potassium citrate) and additives to promote the decomposition of one or more produced gases by combustion of the combustible heat source (eg catalysts such as CuO, Fe2O3 and Al2O3).
[00205] When smoking articles according to the invention comprise a barrier coating disposed on the rear face of the combustible heat source, these additives may be incorporated into the combustible heat source prior to or after application of the barrier coating to the face. rear of the combustible heat source.
[00206] In certain preferred embodiments, the combustible heat source is a carbonaceous combustible heat source comprising carbon and at least one ignition aid. In certain preferred embodiments, the combustible heat source is a carbonaceous combustible heat source comprising carbon and at least one ignition aid, as described in WO-A1-2012/164077.
[00207] As used herein, the term "ignition aid" is used to denote a material that releases oxygen and/or energy during ignition of the combustible heat source where the rate of release of energy and/or oxygen by the material it is not limited by the diffusion of ambient oxygen. In other words, the rate of release of oxygen and/or energy by the material during ignition of the combustible heat source is largely independent of the rate at which ambient oxygen can reach the material. As used herein, the term "ignition aid" is also used to denote an elemental metal that releases energy during ignition of the combustible heat source, where the ignition temperature of the elemental metal is less than about 500°C , and the heat of combustion of the elemental metal is at least about 5 kJ/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 (such as such as alkali metal chloride), alkali metal carbonate or alkali metal phosphate salts, which are believed to modify the combustion of carbon. Even when present in a large amount relative to the total weight of the combustible heat source, such metal-burning alkali metals do not release enough energy during ignition of a combustible heat source to produce an acceptable aerosol during the first few puffs.
[00209] Examples of suitable oxidizing agents include, but are not limited to: nitrates such as potassium nitrate, calcium nitrate, strontium nitrate, sodium nitrate, barium nitrate, lithium nitrate, aluminum nitrate and iron nitrate; nitrites; other organic and inorganic nitro compounds; chlorates such as, for example, sodium chlorate and potassium chlorate; perchlorates such as, for example, sodium perchlorate; chlorides; bromates, such as, for example, sodium bromate and potassium bromate; perbromates; bromides; borates, such as, for example, sodium borate and potassium borate; ferrates, such as, for example, barium ferrate; ferrite; manganates, such as, for example, potassium manganate; permanganates, such as, for example, potassium permanganate; organic peroxides such as, for example, benzoyl peroxide and acetone peroxide; inorganic peroxides, such as, for example, hydrogen peroxide, strontium peroxide, magnesium peroxide, calcium peroxide, barium peroxide, zinc peroxide and lithium peroxide; superoxides, such as, for example, potassium superoxide and sodium superoxide; iodates; periodates; iodides; sulfates; sulfites; other sulfoxides; phosphates; phosphinates; phosphites; and phosphanates.
[00210] The inclusion of ignition and combustion additives, while advantageously improving the ignition and combustion properties of the combustible heat source, can give rise to undesirable combustion and decomposition products during use of the smoking article. For example, the decomposition of nitrates included in the combustible heat source to help ignite it can result in the formation of nitrogen oxides.
[00211] When smoking articles according to the invention comprise an unblinded combustible heat source, the inclusion of a substantially airtight non-combustible barrier between one or more air flow channels and the unblinded combustible heat source can substantially and advantageously inhibit or prevent these reaction products from entering puffed air into smoking articles according to the invention through one or more air flow channels as puffed air passes through one or more airflow channels.
[00212] The inclusion of a substantially air-impermeable non-combustible barrier between the rear face of the combustible heat source and the aerosol forming substrate may also substantially and advantageously prevent or inhibit such decomposition and reaction products from entering the air drawn through the smoking articles according to the invention.
[00213] Carbonaceous combustible heat sources for use in smoking articles according to the invention can be prepared as described in the prior art known to individuals moderately skilled in the art.
[00214] Carbonaceous combustible heat sources for use in smoking articles according to the invention are preferably formed by mixing one or more carbon-containing materials with one or more binders and other additives, where included, and by preform the mixture into a desired shape. The mixture of one or more carbon-containing materials, one or more binders and other optional additives can be preformed into a desired shape using any known ceramic forming method, such as slip, extrusion, molding. injection and compaction or press. In certain preferred embodiments, the mixture is preformed into a desired shape by means of press or extrusion or a combination thereof.
[00215] Preferably, the mixture of one or more carbon-containing materials, one or more binders and other additives is preformed into an elongated rod. However, it should be noted that the mixture of one or more materials containing carbon or more binders and other additives can be preformed into other desired shapes.
[00216] After formation, particularly after extrusion, the elongated rod or any other desired shape is preferably dried to reduce its moisture content and then pyrolyzed in a non-oxidizing atmosphere at a temperature sufficient to carbonize the one or more binders, where present, and substantially eliminate any volatile compounds in the elongated rod or other shape. The elongated rod, or other desired shape, is preferably pyrolyzed in a nitrogen atmosphere at a temperature of between about 700°C and about 900°C.
[00217] In certain embodiments, at least one metal nitrate salt is incorporated into the fuel heat source by including at least one metal nitrate precursor in the mixture of one or more carbon-containing materials, one or more binders and other additives. The at least one metal nitrate precursor is then converted in-situ to the at least one metal nitrate salt by treating the preformed cylindrical rod, or any other pyrolyzed shape, with an aqueous solution of nitric acid. In one embodiment, the combustible heat source comprises at least one metal nitrate salt having a thermal decomposition temperature of less than about 600°C, more preferably less than about 400°C. preferably, at least one metal nitrate salt has a decomposition temperature between about 150°C and about 600°C, more preferably between about 200°C and about 400°C.
[00218] In preferred embodiments, exposure of the combustible heat source to a conventional lighter flame or any other means of ignition should cause at least one metal nitrate salt to decompose and release oxygen and energy. Such decomposition causes an initial rise in the temperature of the combustible heat source and also assists in igniting the combustible heat source. After the decomposition of at least one metal nitrate salt, the combustible heat source preferably continues combustion at a lower temperature.
[00219] The inclusion of at least one metal nitrate salt advantageously results in ignition of the combustible heat source being initiated internally, and not just at a point on the surface thereof. Preferably, at least one metal nitrate salt is present in the fuel heat source in an amount of between about 20 percent dry weight and about 50 percent dry weight of the fuel heat source.
[00220] In other embodiments, the combustible heat source comprises at least one peroxide or superoxide that actively evolves oxygen at a temperature of less than about 600°C, more preferably at a temperature of less than about 400°C.
[00221] Preferably, the at least one peroxide or superoxide actively evolves oxygen at a temperature of between about 150°C and about 600°C, more preferably at a temperature of between about 200°C and about 400°C , more preferably at a temperature of about 350°C.
[00222] In use, exposure of the combustible heat source to a yellow flame of a conventional lighter or any other means of ignition must cause at least one peroxide or superoxide to decompose and release oxygen. This causes an initial rise in the temperature of the combustible heat source and also assists in igniting a combustible heat source. After the decomposition of at least one peroxide or superoxide, the combustible heat source preferably continues its combustion at a lower temperature.
[00223] The inclusion of at least one peroxide or superoxide advantageously results in the ignition of the combustible heat source being initiated internally, and not just at a point on its surface.
The combustible heat source preferably has a porosity of between about 20 percent and about 80 percent, more preferably between about 20 percent and 60 percent. Where the combustible heat source comprises at least one metal nitrate salt, this advantageously allows oxygen to diffuse into the mass of the combustible heat source at a rate sufficient to maintain combustion while at least one metal nitrate salt decomposes the combustion continues. Even more preferably, the combustible heat source has a porosity of between about 50 percent and about 70 percent, more preferably between about 50 percent and about 60 percent as measured by, for example, porosimetry. of mercury or helium pycnometry. The required porosity can be easily achieved during the production of the combustible heat source using conventional technology and methods.
Advantageously, carbonaceous combustible heat sources for use in smoking articles according to the invention have a bulk density of 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.
[00227] Preferably, the combustible heat sources according to the invention have a length of from about 7mm to about 17mm, more preferably from about 7mm to about 15mm, most preferably from about 7mm to about 15mm. about 13 mm.
Preferably, the combustible heat source has a diameter of between about 5 mm and about 9 mm, more preferably between about 7 mm and about 8 mm.
[00229] Preferably, the combustible heat source is of substantially uniform diameter. However, the combustible heat source can alternatively be tapered so that the diameter of a back of the blind combustible heat source is greater than the diameter of a front of the same. Particularly preferred are substantially cylindrical combustible heat sources. The combustible heat source may, for example, be a tapered cylinder or cylinder of substantially circular cross section or a tapered cylinder or cylinder of substantially elliptical cross section.
[00230] Preferably, smoking articles according to the invention comprise aerosol forming substrates comprising at least one aerosol former and a material capable of emitting volatile compounds in reaction to heating. The herbal material may contain additives, including but not limited to humectants, flavors, binders and mixtures thereof.
[00231] Preferably, the aerosol forming substrate comprises nicotine. More preferably, the aerosol forming substrate comprises tobacco.
[00232] The at least one aerosol former can be any suitable known compound or mixture of compounds which, in use, facilitates the formation of a dense and stable aerosol, and which is substantially resistant to thermal degradation at the article's operating temperature for smoke. Suitable aerosol formers are well known in the art and include, for example, polyhydric alcohols, esters of polyhydric alcohols such as glycerol mono-, di- or triacetate and aliphatic esters of mono-, di- or polycarboxylic acids, such as dimethyl dodecanedioate and dimethyl tetradecanedioate. Preferred aerosol formers for use in smoking articles in accordance with the invention are polyhydric alcohols or mixtures thereof, such as triethylene glycol, 1,3-butanediol and, most preferably, glycerin.
[00233] The material capable of emitting volatile compounds in response to heating may be a plant-based material charge. The material capable of emitting volatile compounds in response to heating may be a homogenized vegetable-based material charge. For example, the aerosol forming substrate can comprise one or more plant-derived materials, including, but not limited to: tobacco; tea, for example green tea; mint; blond; eucalyptus; basil; saves; verbena; and tarragon.
Preferably, the material capable of emitting volatile compounds in response to heating is a load of tobacco-based material, more preferably a load of homogenized tobacco-based material.
[00235] The aerosol forming substrate may be in the form of a plug or segment comprising a material capable of emitting volatile compounds in response to heating circumscribed by a paper or other wrapping. As stated above, whenever an aerosol forming substrate is in the form of such a plug or segment, the entire plug or segment, including any casing, will be considered to be the aerosol forming substrate.
Preferably, the aerosol forming substrate has a length between about 5 mm and about 20 mm, more preferably between about 8 mm and about 12 mm.
[00237] In preferred embodiments, the aerosol forming substrate comprises a plug of tobacco-based material wrapped in a plug wrap. In specific preferred embodiments, the aerosol forming substrate comprises a plug of homogenized tobacco-based material wrapped in a plug wrap.
Smoking articles according to the invention preferably comprise a nozzle downstream of the aerosol forming substrate and, where present, downstream of the air flow directing element. The mouthpiece is located at the proximal end of the smoking article.
[00239] Preferably, the nozzle is of low filtration efficiency, more preferably of very low filtration efficiency. The nozzle can be a single segment or a single component nozzle. Alternatively, the nozzle can be a multi-threaded or multi-component nozzle.
[00240] The nozzle may comprise, for example, a filter comprising one or more segments which contain known suitable filtration materials. Suitable filtration materials are known in the art and include, but are not limited to, cellulose acetate and paper. Alternatively or in addition, the mouthpiece may comprise one or more segments comprising absorbents, adsorbents, flavorings, and other aerosol modifiers and additives or combinations thereof.
Smoking articles according to the invention preferably further comprise a transfer element or spacer element between the aerosol forming substrate and the mouthpiece. When present, the air flow directing element is preferably upstream of the transfer element. In such embodiments, the transfer element may be spaced apart from one or both of the nozzle and air flow directing elements.
[00242] The transfer element may touch the aerosol forming substrate and/or the nozzle. Alternatively, the transfer element may be spaced from the aerosol forming substrate and/or the nozzle.
[00243] The inclusion of a transfer element advantageously allows the cooling of the aerosol generated by the transfer of heat from the fuel heat source to the aerosol forming substrate. The inclusion of a transfer element also advantageously allows the overall length of smoking articles according to the invention to be adjusted to a desired value, for example to a length similar to that of conventional cigarettes, by a suitable choice of length of the transfer element.
[00244] The transfer element may have a length of between about 7mm and about 50mm, for example a length of between about 10mm and about 45mm or between about 15mm and about 30mm . The transfer element may have other lengths, depending on the overall desired length of the smoking article, and the presence and length of the other components within the smoking article.
[00245] Preferably, the transfer element comprises at least one hollow tubular body with open ends. In such embodiments, during use, air drawn through the smoking article passes through the at least one hollow tubular body with open ends as it passes downstream through the smoking article from the aerosol forming substrate to the proximal end of the same.
[00246] The transfer element may comprise at least one open-ended hollow tubular body formed from one or more suitable materials that are substantially thermostable at the temperature of the aerosol generated by the transfer of heat from the fuel heat source to the substrate of aerosol formation. Suitable materials are known in the art and include, but are not limited to, paper, paperboard, plastics such as cellulose acetate, ceramics and combinations thereof.
[00247] Alternatively or additionally, smoking articles according to the invention may comprise an aerosol cooling element or heat exchanger between the aerosol forming substrate and the mouthpiece. The aerosol cooling element may comprise a plurality of longitudinally extending channels.
[00248] The aerosol cooling element may comprise a grouped plate of material selected from the group consisting of foil, polymeric material and substantially non-porous paper or paperboard. In certain embodiments, the aerosol cooling element may comprise a grouped plate of material selected from the group consisting of polyethylene (PE), polypropylene (PP), polyvinylchloride (PVC), polyethylene terephthalate (PET), polylactic acid (PLA), cellulose acetate (CA), and aluminum foil.
[00249] In certain preferred embodiments, the aerosol cooling element may comprise a grouped plate of biodegradable polymeric material such as polylactic acid (PLA) or a grade of Mater-Bi® (a family of commercially available starch-based copolyesters ).
Smoking articles according to the invention may comprise one or more aerosol modifying agents downstream of the aerosol forming substrate. For example, one or more of the mouthpiece, transfer element and aerosol refrigeration element of smoking articles according to the invention may comprise one or more aerosol modifying agents.
Suitable aerosol modifying agents include, but are not limited to: flavorings; and chemoesthetic agents.
As used herein, the term "flavoring" is used to describe any agent which, when in use, imparts flavor and/or aroma to an aerosol generated by the aerosol forming substrate of the smoking article.
[00253] As used herein, the term "chemoesthetic agent" is used to describe any agent that, when in use, is perceived in a user's oral or olfactory cavities by means other than, or in addition to, perception through of taste receptor or olfactory receptor cells. Perception of chemoesthetic agents is usually through a "trigeminal response", or through the trigeminal nerve, the glossopharyngeal nerve, the vagus nerve, or some combination thereof. Typically, chemoaesthetic agents are perceived as hot, spicy, refreshing, or soothing sensations.
Smoking articles according to the invention may comprise one or more aerosol modifying agents which are a flavoring and a chemoesthetic agent downstream of the aerosol forming substrate. For example, one or more of the mouthpiece, transfer element and aerosol refrigeration element of smoking articles according to the invention may comprise menthol or other flavoring which provides a chemoaesthetic cooling effect.
Smoking articles according to the invention can be assembled using known methods and machinery.
[00256] The invention will be described below, by way of example only, with reference to the accompanying figures, in which:
[00257] Figure 1 shows a schematic longitudinal cross-section of a smoking article according to a first embodiment of the invention;
[00258] Figure 2 shows a schematic longitudinal cross-section of a smoking article according to a third embodiment of the invention;
[00259] Figure 3 shows a schematic longitudinal cross-section of a smoking article according to a fifth embodiment of the invention.
[00260] The smoking article 2, according to the first embodiment of the invention shown in Figure 1, comprises a blunt combustible heat source 4 with a front face 6 and an opposite rear face 8, an aerosol forming substrate 10, a transfer element 12, an aerosol coolant element 14, a spacer element 16 and a nozzle 18 in contiguous coaxial alignment.
[00261] The blind combustible heat source 4 is a blind carbonaceous combustible heat source and is located at the distal end of the smoking article 2. As shown in Figure 1, a non-combustible substantially airtight barrier 22 in the form of a disk of aluminum foil is provided between the rear face 8 of the blind fuel heat source 4 and the aerosol forming substrate 10. The barrier 22 is applied to the rear face 8 of the blind fuel heat source 4 by pressing the aluminum foil disk on the rear face 8 of the blind fuel heat source 4 and abuts the rear face 8 of the carbonaceous fuel heat source 4 and the aerosol forming substrate 10. It should be appreciated that, in other embodiments of the invention (not shown), no barrier substantially air-impermeable fuel 22 between the rear face 8 of the blind fuel heat source 4 and the aerosol forming substrate 10 can be omitted.
[00262] The aerosol forming substrate 10 is located immediately downstream of the first barrier 22 applied to the rear face 8 of the blind fuel heat source 4. The aerosol forming substrate 10 comprises a cylindrical plug of homogenized tobacco-based material. 24, which includes an aerosol former such as, for example, glycerin, packaged in a plug casing 26.
The transfer element 12 is located immediately downstream of the aerosol forming substrate 10 and comprises a hollow open-ended cellulose acetate tube 28.
The aerosol cooling element 14 is located immediately downstream of the transfer element 12 and comprises a grouped plate of biodegradable polymeric material such as, for example, polylactic acid.
[00265] The spacer element 16 is located downstream of the aerosol refrigeration element 14 and comprises a hollow cylindrical tube with an open end of paper or paper 30.
The mouthpiece 18 is located immediately downstream of the spacer element 16. As shown in Figure 1, the mouthpiece 18 is located at the proximal end of the smoking article 2 and comprises a cylindrical plug of suitable filtration material 32 such as , for example, very low filtration efficiency cellulose acetate fiber packaged in a filter plug casing 34.
[00267] The smoking article 2 further comprises a first heat-conducting element 36 comprising a radially inner layer of suitable heat-conductive material such as, for example, aluminum foil, superimposed and in direct contact with a rear part of the source of combustible heat blinds 4 and a front portion of the aerosol-forming substrate 10. The smoking article 2 also includes a second heat-conducting element 38, comprising a radially outer layer of heat-conductive material, such as, for example, aluminum foil. , a rear portion of the aerosol forming substrate 10 is superposed over the entire length of the transfer element 12. As shown in Figure 1, the radially outer layer of heat-conducting material of the second heat-conducting element 38 does not overlap the radially layer. internal heat-conducting material of the first heat-conducting element 36.
[00268] In other embodiments of the invention (not shown), the first element 36 may comprise one or more radially inner layers of heat-conductive material overlying a rear portion of the blind combustible heat source 4 and the second heat-conducting element 38 may comprise one or more radially outer layers of heat-conductive material that overlap the entire length of the aerosol forming substrate 10.
[00269] Alternatively or additionally, in other embodiments of the invention (not shown), transfer element 12 may extend beyond one or more radially outer layers of heat-conducting material of second heat-conducting element 38 in the downstream direction. In such embodiments, one or more radially outer layers of heat-conductive material from the second heat-conducting element 38 only overlap a rear portion of the transfer element 12. Alternatively, in these embodiments, one or more radially outer layers of heat-conductive material. heat from the second heat-conducting element 38 may not be superimposed on any transfer element 12.
[00270] In the first embodiment of the invention shown in Figure 1, the position around the aerosol forming substrate 10 in which the radially inner layer of heat-conducting material of the first heat-conducting element 36 extends in the downstream direction is approximately a The same as the position around the aerosol forming substrate 10 in which the radially outer layer of heat-conductive material of the second heat-conductive element 38 extends in the upstream direction. That is, the downstream end of the radially inner layer of heat-conducting material of the first heat-conductive element 36 and the upstream end of the radially outer layer of heat-conductive material of the second heat-conductive element 38 are substantially aligned on the substrate 10. In other embodiments of the invention (not shown), one or more radially outer layers of heat-conductive material of the second heat-conducting element 38 may be spaced longitudinally from one or more radially inner layers of heat-conductive material of the first heat-conducting element 36.
[00271] The first heat-conducting element 36 and the second heat-conducting element 38 are radially separated by a layer of heat-insulating material 40, such as cigarette paper, which overlaps the entire length of the radially inner layer. of heat-conductive material of the first heat-conducting element 36 and overlaps the entire length of the radially outer layer of heat-conductive material of the second heat-conductive element 38.
[00272] As shown in Figure 1, the layer of heat-insulating material 40 circumscribes the radially inner layer of heat-conducting material of the first heat-conducting element 36, the aerosol-forming substrate 10, the transfer element 12, the aerosol coolant element 14, spacer element 16 and nozzle 18.
[00273] The smoking article may further comprise a tipping paper strip (not shown) circumscribing a downstream end portion of the heat-insulating material layer 40.
[00274] The smoking article 2, according to the first embodiment of the invention, comprises one or more first air inlets 42 around the periphery of the aerosol forming substrate 10. As shown in Figure 1, a circumferential arrangement of first air inlets 42 is provided in the plug housing 26 of the aerosol forming substrate 10 and the radially outer layer of heat-conducting material of the second heat-conducting element 38 to admit fresh air inlet (represented by the dotted arrows in Figure 1) inside the aerosol forming substrate 10.
[00275] When in use, a user ignites the blind combustible heat source 4 of the smoking article 2 according to the first embodiment of the invention and then draws into the mouthpiece 18. When the user draws into the mouthpiece 18, the air Fresh (shown by the dotted arrows in Figure 1) is drawn into the aerosol forming substrate 10 of the smoking article 2 through the first air inlets 42.
[00276] The front of the aerosol forming substrate 10 is heated by conduction through the rear 8 of the blind fuel heat source 4 and the first barrier 22 and the first heat conducting element 36. Heating the aerosol forming substrate aerosol 10 by conduction releases glycerin and other volatile and semi-volatile compounds from the plug of homogenized tobacco-based material 24. The compounds released from the aerosol forming substrate 10 form an aerosol that enters the air drawn into the forming substrate of aerosol 10 of the smoking article 2 through first air inlets 42 while flowing through the aerosol-forming substrate 10. The entrained air and entrained aerosol (shown by dotted arrows in Figures 1) pass downstream through the interior of the tube. of hollow cellulose acetate with open end 28 from the transfer element 12, the aerosol cooling element 14 and by the spacer element 16, where and they cool and condense. The engulfed cooled air and entrained aerosol pass downstream through the mouthpiece 18 and are delivered to the user through the proximal end of the smoking article 2 in accordance with the first embodiment of the invention. The substantially airtight non-combustible barrier 22 on the rear face 8 of the blind combustible heat source 4 isolates the blind combustible heat source 4 from air drawn through the smoking article 2 so that, when in use, the air drawn through the smoking article 2 do not come into direct contact with the blind combustible heat source 4.
[00277] When in use, the second heat-conducting element 38 reduces radiant heat losses from the outer surfaces of the smoking article 2. This, in turn, assists in maintaining the temperature of the aerosol forming substrate 10 in order to facilitate continued and improved aerosol delivery.
[00278] It should be appreciated that, in other embodiments of the invention (not shown), smoking article may further comprise an outer wrap of sheet material such as cigarette paper, with low air permeability, which circumscribes substrate aerosol forming element 10, transfer element 12, aerosol cooling element 14, spacer element 16, nozzle 18 and rear portion of fuel heat source blind 4 and overlying the second heat conducting element.
[00279] In these embodiments, a circumferential arrangement of the first air inlets 42 is provided in the plug housing 26 of the aerosol forming substrate 10, the radially outer layer of heat-conducting material of the second heat-conducting element 38, and outer wrapper overlaid to admit fresh air (represented by the dotted arrows in Figure 1) on the aerosol forming substrate 10.
[00280] A smoking article according to a second embodiment of the invention (not shown) with a construction very similar to the smoking article according to the first embodiment of the invention shown in Figure 1. Meanwhile, in the smoking article according to In the second embodiment of the invention, the layer of heat-insulating material 40 overlying the first heat-conducting element 36 and overlying the second heat-conducting element 38 is omitted and the second heat-conductive element 38 is formed of a laminated material comprising a layer an outer layer of a heat-conducting material such as aluminium, and an inner layer of a heat-insulating material such as paper.
[00281] A smoking article 44 according to a third embodiment of the invention shown in Figure 2 is similar in construction to the smoking article according to the first embodiment of the invention shown in Figure 1. However, in the smoking article 44 according to with the third embodiment of the invention, first air inlets 42 around the periphery of aerosol forming substrate 10 are omitted and combustible heat source 4 is an unblinded carbonaceous combustible heat source comprising a single air flow channel center 46 extending from the front face 6 to the rear face 8 of the unblinded fuel heat source 4.
[00282] As shown in Figure 2, a substantially airtight non-combustible barrier 48 is provided between the combustible heat source 4 and the central air flow channel 46. The barrier 48 comprises a substantially airtight non-combustible barrier coating. air provided over the entire inner surface of the single central air flow channel 46. In other embodiments of the invention (not shown), the non-combustible substantially air-impermeable barrier 48 between the combustible heat source 4 and the air flow channel switch 46 can be omitted.
Like the smoking article according to the first embodiment of the invention shown in Figure 1, the smoking article 44 according to the third embodiment of the invention shown in Figure 2 comprises a first heat-conducting element 36 comprising a layer radially internally of superimposed heat-conductive material and in direct contact with a rear portion of the blind fuel heat source 4, a front portion of the aerosol forming substrate 10, and a second heat-conductive element 38 comprising a radially external layer of conductive material of heat superimposed on a rear portion of the aerosol forming substrate 10 and the entire length of the transfer element 12. Meanwhile, as shown in Figure 1, in the smoking article 44 in accordance with the second embodiment of the invention, the radially outer layer of heat-conducting material of the second heat-conducting element 38 is spaced longitudinally from the radially inner layer of m. heat-conducting material of the first heat-conducting element 36.
[00284] When in use, a user ignites the non-blinded combustible heat source 4 of the smoking article 44 in accordance with the second embodiment of the invention and then engulfs in mouthpiece 18. When the user inhales into mouthpiece 18, the Fresh air (shown by the dotted arrows in Figure 2) is drawn into the aerosol forming substrate 10 of the smoking article 2 through the central air flow channel 46. The substantially airtight non-combustible barrier 22 on the rear face 8 of the non-blind combustible heat source 4 and the substantially airtight non-combustible barrier 48 on the inner surface of the single air flow channel 46 isolates the non-blind combustible heat source 4 from the air drawn through the smoking article 44 so that , when in use, the air drawn through the smoking article 44 does not come into direct contact with the non-blind combustible heat source 4.
[00285] A smoking article according to a fourth embodiment of the invention (not shown) is very similar in construction to the smoking article according to the third embodiment of the invention shown in Figure 2. Meanwhile, in the smoking article according to In the third embodiment of the invention, the layer of heat-insulating material 40 overlying the first heat-conducting element 36 and overlying the second heat-conducting element 38 is omitted and the second heat-conductive element 38 is formed of a laminated material comprising an outer layer. of a heat-conductive material such as aluminum, and an inner layer of heat-insulating material such as paper.
[00286] The smoking article 50 according to a fifth embodiment of the invention shown in Figure 3 is very similar in construction to the smoking article according to the first embodiment of the invention shown in Figure 1. Meanwhile, the smoking article 50 according to In the fifth embodiment of the invention, the first air inlets 42 around the periphery of the aerosol forming substrate 10 and the transfer element 12 are omitted, being replaced by the third air inlets 52 and an air flow directing element 54 respectively.
[00287] The air flow directing element 54 is located downstream of the aerosol forming substrate 10 and comprises a substantially air-tight, open-ended hollow tube 56 made of, for example, paperboard, which has the reduced diameter as compared to the aerosol forming substrate 10. The upstream end of the hollow open-ended tube 56 abuts the aerosol forming substrate 10. The downstream end of the hollow open-ended tube 56 is surrounded by a substantially annular seal air-tight 58 having substantially the same diameter as the aerosol forming substrate 10. The remainder of the open-ended hollow tube is incorporated into a cylindrical cellulose acetate fiber plug 60 having substantially the same diameter as the aerosol forming substrate 10 .
[00288] The open-ended hollow tube 56 and the cylindrical cellulose acetate fiber plug 60 are circumscribed by an air-permeable inner casing 62.
[00289] As also shown in Figure 3, a circumferential line of third air inlets 52 are provided in the layer of heat insulating material 40 that circumscribes the inner shell 62.
[00290] During use, when the user draws on the mouthpiece 10, fresh air is drawn into the smoking article 50 according to the second embodiment of the invention through the third air inlets 52. The drawn air passes upstream between the exterior from the open-ended hollow tube 56 and the inner shell 62 through the cellulose acetate fiber cylindrical plug 60 to the aerosol forming substrate 10.
[00291] As in the smoking article 2, in accordance with the first embodiment of the invention shown in Figure 1 and described above, aerosol forming substrate 10 is heated by conduction to form an aerosol which is entrained by the entrained air as it flows through. of the aerosol forming substrate 10. The entrained air and entrained aerosol pass downstream through the interior of the hollow tube 56 of the air flow directing element 54 to the aerosol coolant element 14 and the spacer element 16, where they cool and condense. The cooled aerosol then passes downstream through the mouthpiece 18 of the smoking article 50 into the user's mouth.
[00292] The aerosol cooling element 14 is located immediately downstream of the air flow directing element 54 and, similarly to the first embodiment, comprises a grouped plate of biodegradable polymeric material such as polylactic acid.
[00293] The spacer element 16 is located downstream of the aerosol refrigeration element 14 and comprises a hollow cylindrical tube with an open end of cardboard or paper 30.
The mouthpiece 18 is located immediately downstream of the spacer element 16. As shown in Figure 3, the mouthpiece 18 is located at the proximal end of the smoking article 50 and comprises a cylindrical plug of suitable filtration material 32 as per example, cellulose acetate fiber with very low filtration efficiency, wrapped around a filter plug casing 34.
[00295] The non-combustible and substantially air-impermeable barrier coating 22 provided on the entire rear face of the carbonaceous fuel heat source 4 isolates the carbonaceous fuel heat source 4 from the air flow path through the smoking article 50 in a manner that, when in use, the air drawn through the smoking article 50 along the air flow path does not come into direct contact with the carbonaceous combustible heat source 4.
[00296] As described in reference to the first embodiment shown in Figure 1, in use, the second heat-conducting element 64 reduces radiant heat losses from the outer surfaces of the smoking article 50. This, in turn, aids in maintaining the temperature of the aerosol forming substrate 10 so as to facilitate continued and improved aerosol delivery. As can be seen with reference to Figure 3, the second heat conducting element 64 only overlies the aerosol forming substrate 10 and not the transfer element 12, as in the embodiment described with reference to Figure 1.
[00297] A smoking article according to a sixth embodiment of the invention (not shown) is very similar in construction to the smoking article according to the fifth embodiment of the invention shown in Figure 3. Meanwhile, in the smoking article according to In the fifth embodiment of the invention, the layer of heat-insulating material 40 overlying the first heat-conducting element 36 and overlying the second heat-conducting element 64 is omitted and the second heat-conducting element 64 is formed of a laminated material comprising an outer layer. of a heat-conductive material such as aluminum, and an inner layer of heat-insulating material such as paper.
[00298] The specific embodiments shown in the Figures and described above are intended to illustrate the invention. However, other embodiments can be made without departing from the spirit and scope of the invention as defined in the claims, and it is to be understood that the specific embodiments described above are not intended to be limiting.

权利要求:
Claims (19)
[0001]
1. A smoking article (2, 44, 50), comprising: a combustible heat source (4) having opposite front and rear faces (6, 8); an aerosol forming substrate (10) downstream of the rear face (6) of the combustible heat source (4); a first heat-conducting element (36) comprising one or more radially inner layers of heat-conductive material overlying a rear portion of the combustible heat source (4); characterized in that the smoking article comprises a second heat-conductive element (38, 64) comprising one or more radially outer layers of heat-conductive material overlying at least a portion of the aerosol forming substrate (10), wherein the one or more radially outer layers of heat-conductive material does not overlap the one or more radially inner layers of heat-conductive material.
[0002]
A smoking article (2, 44, 50) according to claim 1, characterized in that the first heat-conducting element (36) comprises one or more radially inner layers of heat-conductive material overlying a rear portion. of the combustible heat source (4) and a front portion of the aerosol forming substrate (10) and the second heat-conducting element (38, 64) comprises one or more radially outer layers of heat-conductive material superimposed on a rear portion. of the aerosol forming substrate (10).
[0003]
A smoking article according to claim 1, characterized in that the first heat-conducting element comprises one or more radially inner layers of heat-conductive material overlying a rear portion of the combustible heat source and the second element A heat conductor comprises one or more radially outer layers of heat conductive material superimposed over the entire length of the aerosol forming substrate.
[0004]
A smoking article (44) according to any one of claims 1 to 3, characterized in that one or more radially outer layers of heat-conducting material of the second heat-conducting element (38) are spaced longitudinally from the one or more radially inner layers of heat-conducting material of the first heat-conducting element (36).
[0005]
5. A smoking article according to any one of claims 1 to 4, characterized in that the second heat-conducting element is formed of a laminated material comprising one or more layers of heat-conductive material and one or more layers of heat insulating material.
[0006]
6. An article for smoking according to any one of claims 1 to 5, characterized in that the second heat-conducting element comprises one or more layers of a heat-reflective material.
[0007]
7. Smoking article according to claim 6, characterized in that the heat-reflecting material reflects more than 50% of the incident radiation.
[0008]
8. Smoking article (2, 44, 50) according to any one of claims 1 to 7, characterized in that the first heat-conducting element (36) and the second heat-conducting element (38, 64) they are radially separated by one or more layers of heat-insulating material (40).
[0009]
9. A smoking article according to any one of claims 1 to 8, characterized in that it further comprises an outer wrap around at least a portion of the second heat-conducting element.
[0010]
10. Smoking article (2, 44, 50) according to any one of claims 1 to 8, characterized in that a radially outer layer of heat-conducting material of the second heat-conducting element (38, 64) is provided on the outside of the smoking article (2, 44, 50) so that the radially outer layer of heat-conducting material of the second heat-conducting element (38, 64) is visible on the outside of the smoking article (2, 44, 50).
[0011]
11. A smoking article (2, 44, 50) according to any one of claims 1 to 10, characterized in that it further comprises a first substantially air-impermeable non-combustible barrier (22) between the rear face (8) of the combustible heat source (4) and the aerosol forming substrate (10).
[0012]
12. Smoking article (2, 50) according to any one of claims 1 to 11, characterized in that the combustible heat source (4) is a blind combustible heat source.
[0013]
13. A smoking article (44) according to any one of claims 1 to 11, characterized in that it further comprises one or more air flow channels (46) extending from the front face (6) to the rear face (8) of the combustible heat source (4).
[0014]
14. A smoking article (44) according to claim 13, characterized in that it further comprises a second substantially air-impermeable non-combustible barrier (48) between the combustible heat source (4) and the one or more channels of air flow (46).
[0015]
15. A smoking article (2) according to any one of claims 1 to 14, characterized in that it further comprises one or more first air inlets (42) around the periphery of the aerosol forming substrate (10) .
[0016]
16. A smoking article according to any one of claims 1 to 15, characterized in that the aerosol-forming substrate is spaced from the rear face of the combustible heat source.
[0017]
17. The smoking article of claim 16, further comprising one or more second air inlets between the rear face of the combustible heat source and the aerosol forming substrate.
[0018]
18. A smoking article (50) according to any one of claims 1 to 17, characterized in that it further comprises one or more third air inlets (52) downstream of the aerosol forming substrate (10).
[0019]
19. Smoking article according to any one of claims 1 to 18, characterized in that it further comprises one or more aerosol modifying agents downstream of the aerosol forming substrate.

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同族专利:

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公开号 | 公开日

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US20160192704A1|2016-07-07|

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JP6526672B2|2019-06-05|

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EP3041376B1|2019-07-03|

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WO2015028654A1|2015-03-05|

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TWI657753B|2019-05-01|

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PL3041376T3|2019-12-31|

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MX366710B|2019-07-22|

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ES2740130T3|2020-02-05|

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IL242603A|2020-08-31|

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MX2016002729A|2016-06-08|

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BR112016002652A2|2017-08-01|

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CN105473013A|2016-04-06|

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RU2016112184A|2017-10-09|

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AR097522A1|2016-03-23|

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KR20160052534A|2016-05-12|

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PH12015502569B1|2016-02-29|

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RU2654193C2|2018-05-16|

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SG11201601419PA|2016-03-30|

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AU2014314050B2|2018-05-10|

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PT3041376T|2019-10-25|

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UA117018C2|2018-06-11|

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CA2918276A1|2015-03-05|

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AU2014314050A1|2015-12-17|

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EP3041376A1|2016-07-13|

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JP2016531572A|2016-10-13|

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CN105473013B|2019-06-25|

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US10159277B2|2018-12-25|

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TW201524380A|2015-07-01|

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PH12015502569A1|2016-02-29|

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法律状态:
2019-12-24| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|

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2021-05-04| B06A| Patent application procedure suspended [chapter 6.1 patent gazette]|

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2021-06-29| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|

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2021-09-08| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 01/09/2014, OBSERVADAS AS CONDICOES LEGAIS. |

优先权:

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EP13182663|2013-09-02|

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EP13182663.8|2013-09-02|

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PCT/EP2014/068482|WO2015028654A1|2013-09-02|2014-09-01|Smoking article with non-overlapping, radially separated, dual heat-conducting elements|

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