SMOKING ARTICLE AND METHOD TO REDUCE OR ELIMINATE TEMPERATURE INCREASES IN AN AEROSOL FORMATION SUBS

专利摘要:
smoking article and method for reducing or eliminating temperature increases of an aerosol-forming substrate. the present invention relates to a smoking article (2, 40, 50, 60) which has an end of the mouth and a distal end, the smoking article (2, 40, 50, 60) comprises: a source of heat (4); an aerosol-forming substrate (6) downstream of the heat source (4); at least one air inlet downstream of the aerosol-forming substrate (6); and an air flow path that extends between at least one air inlet and the mouth end of the smoking article (2, 40, 50 and 60). the air flow path comprises a first part extending longitudinally upstream from at least one air inlet towards the aerosol forming substrate (6) and a second part extending longitudinally downstream of the first part in towards the mouth end of the smoking article (2, 40, 50, 60).
公开号:BR112014017614B1
申请号:R112014017614-0
申请日:2013-02-12
公开日:2020-10-06
发明作者:Oleg Mironov
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 heat source and an aerosol forming substrate downstream of the heat source.
[002] Various smoking articles, in which tobacco is heated instead of burned, have been proposed in the art. One of the aims of such "heated smoking articles" is to reduce known harmful components of smoke of the type produced by the combustion and pyrolytic degradation of tobacco in conventional cigarettes. In a known type of heated smoking article, an aerosol is generated by transferring heat from a combustible heat source to an aerosol-forming substrate located downstream of the combustible heat source. During smoking, volatile compounds are released from the aerosol-forming substrate by transferring heat from the combustible heat source and aspirated into the air drawn through the smoking article. As the released compounds cool, they condense to form an aerosol that is inhaled by the user. Normally, air is drawn into such known smoking articles heated through one or more airflow channels supplied through the combustible heat source and the transfer of heat from the combustible heat source to the aerosol forming substrate occurs. by 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 and in direct contact with a rear part of the combustible heat source and an adjacent front part of the aerosol-forming substrate. To provide a controlled amount of convection heating of the aerosol forming substrate, at least one longitudinal airflow channel is provided through the combustible heat source.
[004] In known heated smoking articles in which the heat transfer from the heat source to the aerosol forming substrate occurs mainly by convection, the heat transfer by convection and therefore the temperature in the aerosol forming substrate can vary considerably, depending on the user's puffing behavior. As a result, the composition and, therefore, the sensory properties of the aerosol of the main stream inhaled by the user can be disadvantageous and highly sensitive to a user's smoking regime.
[005] In known heated smoking articles in which the air sucked through the heated smoking article comes in direct contact with a combustible heat source from the heated smoking article, puffing by a user results in the combustion of the combustible heat source being activated . Intense smoking regimes can therefore lead to convection heat transfer high enough to cause spikes in the temperature of the aerosol-forming substrate, disadvantageously leading to pyrolysis and potentially even local combustion of the aerosol-forming substrate. As used herein, the term "peak" is used to describe a short-lived increase in the temperature of the aerosol-forming substrate.
[006] The levels of undesirable pyrolysis and combustion by-products in the mainstream aerosols generated by such known heated smoking articles can also vary significantly disadvantageously, depending on the specific smoking regime adopted by the user.
[007] There remains a need for a heated smoking article comprising a heat source and an aerosol-forming substrate downstream of the heat source in which temperature peaks of the aerosol-forming substrate are avoided under intense smoking regimes . In particular, there remains a need for a heated smoking article comprising a heat source and an aerosol-forming substrate downstream of the heat source in which substantially no combustion or pyrolysis of the aerosol-forming substrate occurs under intense smoking regimes.
[008] According to the invention there is provided a smoking article which has an end of the mouth and a distal end. The smoking article comprises: a heat source; an aerosol-forming substrate downstream of the heat source; at least one air inlet downstream of the aerosol-forming substrate; and an air flow path that extends between at least one air inlet and the mouth end of the smoking article. The air flow path comprises a first part that extends longitudinally upstream from at least one air inlet towards the aerosol forming substrate and a second part that extends longitudinally downstream of the first part towards the end from the mouth of the smoking article.
[009] In use, air is drawn into the first part of the air flow path through at least one air inlet. The aspirated air passes upstream through the first part of the air flow path towards the aerosol forming substrate and then downstream towards the mouth end of the article to smoke through the second part of the air flow path. air.
[0010] According to the invention there is also provided a method of reducing or eliminating the temperature increases of an aerosol-forming substrate of a smoking article during puffs. The method comprises providing a smoking article including: a heat source; an aerosol-forming substrate downstream of the heat source; at least one air inlet downstream of the aerosol-forming substrate; and an air flow path that extends between at least one air inlet and the mouth end of the smoking article. The air flow path comprises a first part that extends longitudinally upstream from at least one air inlet towards the aerosol forming substrate and a second part that extends longitudinally downstream of the first part towards the end from the mouth of the smoking article such that, in use, the air drawn into the smoking article through at least one air inlet passes upstream through the first part of the air flow path towards the forming substrate of aerosol and then downstream towards the mouth end of the article for smoking through the second part of the airflow path.
[0011] As used herein, the term "air flow path" is used to describe a path along which air can be drawn through the smoking article for inhalation by a user.
[0012] As used herein, the term "aerosol-forming substrate" is used to describe a substrate capable of releasing volatile compounds upon heating, which 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 (for example, fine particles of substances, which are in a gaseous state, which are normally liquid or solid at room temperature) as well as condensed vapor liquid gases and droplets.
[0013] As used herein, the terms "upstream" and "front", and "downstream" and "rear" are used to describe the relative positions of the components, or parts of the components, of the smoking article, in relation to the direction in which a user uses the article to smoke during its use. The smoking articles according to the invention comprise one end of the mouth and a far opposite end. In use, a user uses the mouth end of the article to smoke. The end of the mouth is downstream from the distal end. The heat source is located at or near the distal end.
[0014] As used in this document, the term "length" is used to describe the dimension in the longitudinal direction of the smoking article.
[0015] As used herein, the term "insulated heat source" is used to describe a heat source that does not come in direct contact with the air drawn through the article to smoke along the airflow path.
[0016] As used in this document, the term "direct contact" is used to describe the contact between the air drawn through the smoking article along the airflow path and a surface of the heat source.
[0017] As described below, the smoking articles according to the invention can comprise heat sources that are blind or not blind.
[0018] As used herein, the term "blind" is used to describe a heat source of a smoking article according to the invention in which the air drawn through the smoking article for inhalation by a user does not pass through any airflow channels along the heat source.
[0019] As used herein, the term "not blind" is used to describe a heat source of a smoking article according to the invention in which the air drawn through the smoking article for inhalation by a user passes through one or more airflow channels along the heat source.
[0020] As used herein, the term "air flow channel" is used to describe a channel along which the length of a heat source through which air can be sucked downstream for inhalation by a user.
[0021] According to the invention, during puffs by a user, cold air pulled through at least one air inlet downstream of the aerosol-forming substrate and upstream through the first part of the airflow path towards the aerosol forming substrate advantageously reduces the temperature of the aerosol forming substrate of smoking articles according to the invention. This substantially prevents or inhibits spikes in the temperature of the aerosol forming substrate during a user's puffs.
[0022] As used herein, the term "cold air" is used to describe ambient air that is not significantly heated by the heat source over a user's puffs.
[0023] By preventing or inhibiting spikes in the temperature of the aerosol-forming substrate, the inclusion of an airflow path that extends between at least one air inlet downstream of the aerosol-forming substrate and the end of the mouth of the smoking article, where the air flow path comprises a first part that extends longitudinally upstream of at least one air inlet, towards an aerosol-forming substrate and a second part that extends longitudinally downstream from the first part towards the mouth end of the smoking article, it advantageously helps to prevent or reduce the combustion or pyrolysis of the aerosol forming substrate of the smoking articles according to the invention under intense puff regimes. In addition, the inclusion of such an airflow pathway helps to minimize or reduce the impact of a user's blowout regime on the composition of the main stream of the smoking articles aerosol according to the invention.
[0024] Preferably, the first part of the air flow path extends longitudinally upstream from at least one air inlet to at least in the vicinity of the aerosol-forming substrate. Preferably, the first part of the air flow path extends longitudinally upstream from at least one inlet to the aerosol forming substrate.
[0025] Preferably, the second part of the airflow path that extends longitudinally downstream from at least the proximity of the aerosol-forming substrate towards the mouth end of the smoking article. Preferably, the second part of the air flow path extends longitudinally downstream from the aerosol-forming substrate towards the mouth end of the smoking article.
[0026] In certain embodiments, the second part of the air flow path that can extend longitudinally downstream from within the aerosol-forming substrate towards the mouth end of the smoking article.
[0027] In a preferred embodiment, the first part of the air flow path that extends longitudinally upstream from at least one air inlet to the aerosol forming substrate and the second part of the air flow path that extends longitudinally downstream of the aerosol forming substrate towards the mouth end of the smoking article.
[0028] In another preferred embodiment, the first part of the air flow path that extends longitudinally upstream from at least one air inlet to the aerosol forming substrate and the second part of the air flow path which extends longitudinally downstream from within the aerosol forming substrate towards the mouth end of the smoking article.
[0029] In use, an aerosol is generated by transferring heat from the heat source to the aerosol-forming substrate of smoking articles according to the invention. By adjusting the position of the upstream end of the second part of the airflow path in relation to the aerosol-forming substrate, it is possible to control the location at which the aerosol exits the aerosol-forming substrate. This advantageously allows the smoking articles according to the invention to be produced having desired aerosol deliveries.
[0030] In preferred embodiments, the air drawn into the first part of the air flow path through at least one air inlet passes upstream through the first part of the air flow path to the aerosol forming substrate, through the aerosol forming substrate and then towards the mouth end of the article to smoke through the second part of the airflow path.
[0031] In a preferred embodiment, the first part of the airflow path and the second part of the airflow path are concentric. However, it should be noted that, in other embodiments, the first part of the air flow path and the second part of the air flow path may be non-concentric. For example, the first part of the airflow path and the second part of the airflow path can be parallel and not concentric.
[0032] When the first part of the airflow path and the second part of the airflow path are concentric, preferably the first part of the airflow path surrounds the second part of the airflow path. However, it will be appreciated that, in other embodiments, the second part of the air flow path may surround the first part of the first air flow path.
[0033] In a particularly preferred embodiment, the first part of the airflow path and the second part of the airflow path are concentric, the second part of the airflow path is arranged substantially centralized within the smoking article and the first part of the airflow path surrounds the second part of the airflow path. This arrangement is particularly advantageous when smoking articles according to the invention further comprise a heat conducting element around and in direct contact with a rear part of the heat source and an adjacent front part of the aerosol forming substrate.
[0034] The first part of the air flow path and the second part of the air flow path can be of substantially constant cross section. For example, where the first part of the airflow path and the second part of the airflow path are concentric, one of the first part of the airflow path and the second part of the airflow path may be sectional substantially constant circular cross section and the other part of the first part of the air flow path and the second part of the air flow path may have a substantially constant annular cross section.
[0035] Alternatively, one or both the first part of the air flow path and the second part of the air flow path may be of non-constant cross section. For example, the first part of the air flow path can be tapered in such a way that the cross section of the first part of the air flow path increases or decreases as the first part of the air flow path extends upstream. Alternatively or otherwise, the second part of the air flow path can be tapered in such a way that the cross section of the second part of the air flow path increases or decreases as the second part of the air flow path extends downstream .
[0036] In a preferred embodiment, the cross section of the first part of the air flow path increases as the first part of the air flow path extends upstream and the cross section of the second part of the air flow path increases as the second part of the air flow path extends downstream.
[0037] Preferably, smoking articles according to the invention comprise an outer shell that circumscribes at least a rear part of the heat source, the aerosol forming substrate and any other components of the smoking article downstream of the substrate of aerosol formation. Preferably, the outer shell is substantially impermeable to air. Smoking articles according to the invention may comprise outer casings formed from any suitable material or combination of materials. Suitable materials are well known in the art and include, but are not limited to, cigarette paper. The outer shell must hold the heat source and the aerosol forming substrate of the smoking article when the smoking article is assembled.
[0038] At least one air inlet downstream of the aerosol-forming substrate for aspiration of air into the first part of the airflow path is provided in the outer casing and any other materials surrounding the components of the smoking articles of according to the invention by which air can be sucked into the first part of the air flow path. As used herein, the term "air inlet" is used to describe one or more holes, crevices, grooves or other openings in the outer casing and any other materials surrounding the components of smoking articles according to the invention, the downstream of the aerosol-forming substrate through which air can be sucked into the first part of the airflow path.
[0039] The number, shape, size and location of the air intakes can be adjusted accordingly to achieve a good smoking performance.
[0040] Preferably, the smoking articles according to the invention comprise an element for directing the air flow downstream of the aerosol forming substrate. The air flow guiding element defines the first part of the air flow path and the second part of the air flow path. At least one air inlet is provided between an end downstream of the aerosol forming substrate and an end downstream of the airflow directing element.
[0041] The air flow directing element can touch the aerosol forming substrate. Alternatively, the air flow directing member can extend into the aerosol forming substrate. For example, in certain embodiments, the air flow directing element may extend up to a distance of up to 0.5 L within the aerosol forming substrate, where L is the length of the aerosol forming substrate.
[0042] The air flow guiding element can be approximately 7 mm to approximately 50 mm long, for example, approximately 10 mm to approximately 45 mm in length or between approximately 15 mm and approximately 30 mm. The air flow directing element may have other lengths depending on the desired total length of the smoking article, and the presence and extent of other components within the smoking article.
[0043] The air flow guiding element may include an open end hollow body substantially impermeable to air. In these embodiments, the exterior of the substantially air-impermeable open end hollow body defines a first part of the airflow path and the second part of the airflow path and the interior of the substantially air-impermeable open end hollow body defines the other first part of the air flow path and the second part of the air flow path.
[0044] The hollow body substantially impermeable to air may be formed from one or more suitable materials that are impermeable to air that are substantially thermally stable at the temperature of the aerosol generated by the transfer of heat from the heat source to the formation substrate. aerosol. Suitable materials are known in the art and include, but are not limited to, cardboard, plastic, ceramic and combinations thereof.
[0045] Preferably, the exterior of the substantially air-impermeable open end hollow body defines the first part of the airflow path and the interior of the substantially air-impermeable open end hollow body defines the second part of the airflow path air.
[0046] In a preferred embodiment, the open end hollow body substantially impermeable to air is a cylinder, preferably a straight circular cylinder.
[0047] In another preferred embodiment, the open end hollow body substantially impermeable to air is a truncated cone, preferably a straight circular cone.
[0048] The hollow end of the open end substantially impermeable to air may have a length of between approximately 7 mm and approximately 50 mm, for example, a length of between approximately 10 mm and approximately 45 mm or between approximately 15 mm and approximately 30 mm. The substantially air-impermeable open end hollow body may have other lengths depending on the desired total length of the smoking article, and the presence and extent of other components within the smoking article.
[0049] Where the hollow end of the substantially air-tight open end is a cylinder, the cylinder may have a diameter between approximately 2 mm and approximately 5 mm, for example, a diameter between approximately 2.5 mm and approximately 4.5 mm . The cylinder may have other diameters, depending on the desired total diameter of the smoking article.
[0050] Where the hollow end of the substantially air-tight open end is a truncated cone, the upstream end of the truncated cone may have a diameter between approximately 2 mm and approximately 5 mm, for example, a diameter between approximately 2.5 mm and approximately 4.5 mm. The upstream end of the truncated cone may have other diameters, depending on the desired total diameter of the smoking article.
[0051] Where the hollow end of the substantially air-tight open end is a truncated cone, the downstream end of the truncated cone may have a diameter between approximately 5 mm and approximately 9 mm, for example, between approximately 7 mm and approximately 8 mm . The downstream end of the truncated cone may have other diameters, depending on the desired total diameter of the smoking article. Preferably, the downstream end of the truncated cone is substantially the same diameter as the aerosol-forming substrate.
[0052] The open end hollow body substantially impermeable to air can touch the aerosol forming substrate. Alternatively, the open end hollow body substantially impermeable to air may extend into the aerosol forming substrate. For example, in certain embodiments the hollow body of an open end substantially impermeable to air may extend a distance of up to 0.5 L within the aerosol-forming substrate, where Léo is the length of the aerosol-forming substrate.
[0053] The upstream end of the hollow body substantially impermeable to air has a reduced diameter compared to that of the aerosol forming substrate.
[0054] In certain embodiments, the downstream end of the hollow body substantially impermeable to air has a reduced diameter compared to that of the aerosol forming substrate.
[0055] In other embodiments, the downstream end of the substantially air-tight hollow body has substantially the same diameter as the aerosol-forming substrate.
[0056] Where the downstream end of the substantially air-impermeable hollow body has a reduced diameter compared to the aerosol-forming substrate, the substantially air-impermeable hollow body can be circumscribed by a substantially air-tight seal. In such embodiments, the substantially air-tight seal is located downstream of at least one air inlet. The substantially air-tight seal may be substantially the same diameter as the aerosol-forming substrate. For example, in some embodiments, the downstream end of the substantially air-impermeable hollow body may be circumscribed by a substantially impermeable plug or washer of substantially the same diameter as the aerosol-forming substrate.
[0057] The substantially air-tight seal may be formed from one or more suitable materials that are air-tight which are substantially thermally stable at the temperature of the aerosol generated by the heat transfer 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.
[0058] At least part of the length of the hollow body of the open end substantially impermeable to air may be circumscribed by an air-permeable diffuser. The air-permeable diffuser can be substantially the same diameter as the aerosol-forming substrate. The air-permeable diffuser may be formed from one or more suitable materials that are impermeable to air that are substantially thermally stable at the temperature of the aerosol generated by the transfer of heat from the 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 filaments, cotton, ceramics and open cell polymer foams, tobacco material and combinations thereof . In certain preferred embodiments, the air-permeable diffuser comprises a substantially homogeneous, porous, air-permeable material.
[0059] In a preferred embodiment, the air flow directing element comprises a hollow tube of substantially air-tight open end, the hollow tube of reduced diameter compared to the aerosol-forming substrate and a substantially air-tight annular seal , substantially the same diameter as the aerosol-forming substrate, which circumscribes the hollow tube downstream of at least one air inlet.
[0060] In this embodiment, the volume radially bounded by the outside of the hollow tube and an outer casing of the smoking article defines the first part of the air flow path that extends longitudinally upstream of at least one air inlet towards the substrate of aerosol formation and the volume radially delimited by the interior of the hollow tube defines the second part of the air flow path that extends longitudinally downstream towards the mouth end of the smoking article.
[0061] The air flow guiding element may further comprise an inner casing, which circumscribes the hollow tube and the substantially air-tight annular seal.
[0062] In this embodiment, the volume radially bounded by the outside of the hollow tube and the inner shell of the airflow directing element defines the first part of the airflow path that extends longitudinally upstream from at least one air inlet towards the aerosol-forming substrate and the volume radially delimited by the interior of the hollow tube defines the second part of the airflow path that extends downstream longitudinally towards the mouth end of the smoking article.
[0063] The open end upstream of the hollow tube can abut against an end downstream of the aerosol-forming substrate. Alternatively, the open upstream end of the hollow tube can be inserted or otherwise extend to the downstream end of the aerosol forming substrate.
[0064] The air flow directing element may additionally comprise an air-permeable annular diffuser of substantially the same outer diameter as the aerosol forming substrate, which circumscribes at least a part of the length of the hollow tube upstream of the seal ring substantially impermeable to air. For example, the hollow tube can be at least partially embedded in a cellulose acetate filament plug.
[0065] Where the air flow directing element further comprises an inner shell, the inner shell can circumscribe the hollow tube, the substantially air-tight annular seal and the air-permeable annular diffuser.
[0066] In use, when a user aspirates the mouth end of the article for smoking, fresh air is sucked into the article for smoking through at least one air inlet downstream of the aerosol-forming substrate. The suctioned air passes upstream to the aerosol forming substrate along the first part of the airflow path between the outside of the hollow tube and the outer wrapping of the smoking article or inner wrapping of the airflow directing element. The aspirated air passes through the aerosol-forming substrate and then passes downstream along the second part of the airflow pathway through the interior of the hollow tube towards the mouth end of the article for smoking for inhalation by user.
[0067] Where the air flow directing element comprises an air-permeable ring diffuser.
[0068] In another preferred embodiment, the airflow directing element comprises a truncated hollow cone of substantially air-tight open end having an upstream end of reduced diameter compared to the aerosol forming substrate and a downstream end of substantially the same diameter as the aerosol-forming substrate. In this embodiment, the volume radially bounded by the exterior of the truncated hollow cone and an outer casing of the smoking article defines the first part of the airflow path that extends longitudinally upstream of at least one air inlet towards the forming substrate of aerosol and the volume delimited radially by the interior of the truncated hollow cone defines the second part of the air flow path that extends longitudinally downstream towards the mouth end of the smoking article.
[0069] The open end upstream of the truncated hollow cone can abut against an end downstream of the aerosol forming substrate. Alternatively, the open upstream end of the truncated hollow cone can be inserted or otherwise extend to the downstream end of the aerosol forming substrate. The air flow directing member may additionally comprise a permeable annular air diffuser of substantially the same outer diameter as the aerosol forming substrate, which circumscribes at least part of the length of the truncated hollow cone. For example, the truncated hollow cone can be at least partially embedded in a cellulose acetate filament plug.
[0070] In use, when a user aspirates the mouth end of the article for smoking, fresh air is sucked into the article for smoking through at least one air inlet downstream of the aerosol-forming substrate. The aspirated air passes upstream to the aerosol forming substrate along the first part of the airflow path between the outer casing of the smoking article and the truncated hollow cone of the airflow directing element. The aspirated air passes through the aerosol-forming substrate and then passes downstream along the second part of the airflow pathway through the interior of the truncated hollow cone towards the mouth end of the article for smoking for inhalation by the user.
[0071] Where the air flow directing element comprises an air-permeable ring diffuser.
[0072] Smoking articles according to the invention may comprise at least one additional air intake.
[0073] For example, the smoking articles according to the invention may comprise at least one additional air intake between an end downstream of the heat source and an end upstream of the aerosol forming substrate. In such embodiments, when a user inhales at the mouth end of the article to smoke through at least one additional air inlet between the downstream end of the heat source and the upstream end of the aerosol forming substrate. The air drawn in through at least one additional air inlet passes downstream through the aerosol-forming substrate and then downstream towards the mouth end of the article for smoking through the second part of the airflow path.
Alternatively, or in addition, the smoking articles according to the invention may comprise at least one additional air intake around the periphery of the aerosol forming substrate. In such embodiments, when a user inhales at the mouth end of the article to smoke cold air, it is also sucked into the aerosol-forming substrate by means of at least one additional air inlet around the periphery of the aerosol-forming substrate. The air drawn in through at least one additional air inlet passes downstream through the aerosol-forming substrate and then downstream towards the mouth end of the article for smoking through the second part of the airflow path.
[0075] The heat source can be a combustible heat source, a chemical heat source, an electrical heat source, a heat sink or any combination of these.
[0076] Preferably, the heat source is a source of combustible heat. In a more preferred mode, the heat source is a combustible heat source. As used herein, the term "carbonaceous" is used to describe a source of combustible heat, comprising carbon.
[0077] Preferably, carbonaceous combustible heat sources for use in smoking products according to the invention have a carbon content of at least approximately 35 percent, more preferably at least approximately 40 percent, more preferably at least approximately 45 percent dry weight of the combustible heat source.
[0078] In some embodiments, the combustible heat sources according to the invention are combustible carbon-based heat sources. As used herein, the term 'carbon-based heat source' is used to describe a heat source composed primarily of carbon.
[0079] Carbon-based combustible heat sources for use in smoking products according to the invention may have a carbon content of at least approximately 50 percent, more preferably at least approximately 60 percent, more preferably at least less about 70 percent, more preferably at least about 80 percent dry weight of the carbon-based fuel heat source.
[0080] Smoking articles according to the invention may comprise carbonaceous combustible heat sources formed from one or more suitable carbon-containing materials.
[0081] If desired, one or more binders can be combined with one or more materials that contain carbon. Preferably, the one or more binders are organic binders. Suitable known organic binders include, but are not limited to, gums (for example, guar gum), modified celluloses and cellulose derivatives (for example, methyl cellulose, carboxymethyl cellulose, hydroxypropyl cellulose and hydroxypropyl methyl cellulose) flours, starches, sugars, vegetable oils and their combinations.
[0082] In a preferred embodiment, the source of combustible heat is formed from a mixture of coal dust, modified cellulose, flour and sugar.
[0083] Instead of, or in addition to, one or more binders, combustible heat sources for use in smoking articles according to the invention may include 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 the consolidation of the combustible heat source (for example, sintering aids), additives to promote ignition of the combustible heat source (for example, oxidizers, such as perchlorates , chlorates, nitrates, peroxides, permanganates, zirconium and combinations thereof, additives to promote the combustion of the combustible heat source (eg, potassium and potassium salts, such as potassium citrate) and additives to promote decomposition of one or more gases produced by the combustion of the combustible heat source (for example, catalysts, such as CuO, Fe2O3 and AI2O3).
[0084] In a preferred embodiment, the combustible heat source is a cylindrical combustible heat source comprising carbon and at least an auxiliary ignition, the cylindrical combustible heat source having a front end face (i.e., face of the upstream end) ) and an opposite rear face (that is, the face of the downstream end), in which at least part of the cylindrical combustible heat source between the front face and the rear face is enclosed in a combustion-resistant housing and in which after ignition of the front face of the cylindrical fuel heat source the rear face of the cylindrical fuel heat source increases in temperature at a first temperature and where during the subsequent combustion of the cylindrical fuel heat source the rear face of the cylindrical fuel heat source maintains a second temperature lower than the first temperature. Preferably, at least one ignition aid is present in an amount of at least approximately 20 weight percent dry from the combustible heat source. Preferably, the combustion-resistant housing is one or both: heat conduction and / or substantially impermeable to oxygen.
[0085] As used herein, the term "ignition aid" is used to designate a material that releases one or both: oxygen and / or energy during ignition of the combustible heat source, where the release rate of one or both; Energy and / or oxygen through the material is not limited to the diffusion of ambient oxygen. In other words, the rate of release of one or both; oxygen and / or energy by the material during ignition of the combustible heat source is largely independent of the rate at which oxygen from the environment can reach the material. As used herein, the term "ignition aid" is also used to designate an elemental metal that releases energy during ignition of the combustible heat source, where the ignition temperature of the metallic element is less than approximately 500 ° C and the heat of combustion of the metallic element is at least approximately 5 kJ / g.
[0086] As used herein, the term "ignition aid" does not include alkali metal salts of carboxylic acids (such as alkali metal citrate salts, alkali metal acetate salts and alkali metal succinate salts), alkali metal halide salts (such as alkali metal chloride salts), alkali metal carbonate salts or alkali metal phosphate salts, which are believed to modify the combustion of carbon. Even when present in a large amount in relation to the total weight of the combustible heat source, such alkali metal salts do not release enough energy when igniting a combustible heat source to produce an acceptable aerosol during first puffs.
[0087] Examples of suitable oxidizing agents include, but are not limited to: nitrates such as, for example, potassium nitrate, calcium nitrate, strontium nitrate, sodium nitrate, barium nitrate, lithium nitrate, aluminum nitrate and iron nitrate; nitrites; other nitro-organic and inorganic compounds; chlorates, such as, for example, sodium chlorate and potassium chlorate; perchlorates, such as, for example, sodium perchlorate; chlorites; bromates, such as, for example, sodium bromate and potassium bromate; perbromates; bromides; borates, such as, for example, sodium borate and potassium borate; ferrates, such as, for example, barium ferrate; ferrets; 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; odiettes; sulfates; sulfites; other sulfoxides; phosphates; phosphates; phosphites; and phosphites.
[0088] While advantageously improving the ignition and combustion properties of the combustible heat source, the inclusion of ignition and combustion additives may give rise to undesirable decomposition and reaction products when using the smoking product. For example, the decomposition of nitrates included in the combustible heat source to aid its ignition can result in the formation of nitrogen oxides. In addition, the inclusion of oxidants, such as nitrates or other additives to aid ignition, can result in the generation of hot gases and high temperatures in the combustible heat source during ignition of the combustible heat source.
[0089] In the smoking articles according to the invention, the heat source is preferably isolated from all air flow paths along which air can be sucked through the smoking article for inhalation by a user of such that, in use, the air sucked through the smoking article does not directly contact the heat source.
[0090] In embodiments where the heat source is a combustible heat source, the isolation of the combustible heat source from the aspirated air through the smoking article advantageously significantly prevents or inhibits the entry of products and other materials formed during the ignition and combustion of the combustible heat source of the smoking articles according to the invention of the air sucked through the smoking articles.
[0091] The isolation of the combustible heat source from the air sucked through the smoking article also advantageously significantly prevents or inhibits the combustion activation of the combustible heat source of the smoking articles according to the invention during puffs by a user . This substantially prevents or inhibits spikes in the temperature of the aerosol forming substrate during a user's puffs.
[0092] By preventing or inhibiting the activation of the combustion of the combustible heat source, and thus preventing or inhibiting excess temperature increases in the aerosol-forming substrate, combustion or pyrolysis of the aerosol-forming substrate of the smoking articles accordingly with the invention under intense puff regimes can be advantageously avoided. In addition, the impact of a user's puffing regime on the main stream aerosol composition of the smoking articles according to the invention can be advantageously minimized or reduced.
[0093] The isolation of the heat source from the air sucked through the smoking article isolates the heat source from the aerosol-forming substrate. The isolation of the heat source from the aerosol forming substrate can advantageously significantly prevent or inhibit the migration of the components of the aerosol forming substrate of the smoking articles according to the invention to the heat source, during the storage of the articles smoking.
[0094] Alternatively, or in addition, the isolation of the heat source from the air drawn through the smoking article can significantly advantageously prevent or inhibit the migration of the components of the aerosol forming substrate of the smoking articles according to the invention for the heat source, when using the smoking articles.
[0095] As further described below, isolation of the heat source from the air drawn through the smoking article and the aerosol forming substrate is particularly advantageous where the aerosol forming substrate comprises at least one aerosol former.
[0096] In embodiments where the heat source is a combustible heat source, to isolate the combustible heat source from the air aspirated through the smoking article, smoking articles according to the invention may include an incombustible material, significantly impermeable to air, barrier between an end downstream of the combustible heat source and an end upstream of the aerosol-forming substrate.
[0097] As used in this document, the term 'non-combustible is used to describe a barrier that is significantly non-combustible at temperatures reached by the combustible heat source during combustion or ignition thereof.
[0098] The barrier can touch one or both ends downstream of the combustible heat source and the end upstream of the aerosol-forming substrate.
[0099] The barrier can be adhered or affixed in another way to one or both ends downstream of the combustible heat source and the upstream end of the aerosol forming substrate.
[00100] In some embodiments, the barrier comprises a barrier coating provided on a rear face of the combustible heat source. In such embodiments, the barrier preferably comprises a barrier coating provided on at least substantially the entire rear face of the combustible heat source. More preferably, the barrier comprises a barrier coating provided on every rear face of the combustible heat source.
[00101] As used in this document, the term "coating" is used to describe a layer of material that covers and is adhered to the source of combustible heat.
[00102] The barrier can advantageously limit the temperature to which the aerosol-forming substrate is exposed during ignition or combustion of the combustible heat source, and thus help to prevent or reduce thermal degradation or combustion of the forming substrate. aerosol spray when using the smoking article. This is particularly advantageous where the combustible heat source comprises one or more additives to assist the ignition of the combustible heat source.
[00103] Depending on the characteristics and the desired performance of the smoking article, the barrier may have a low thermal conductivity or a high thermal conductivity. In certain embodiments, the barrier may be formed from material that has a greater thermal conductivity between approximately 0.1 W per meter Kelvin (W / (nvK)) and approximately 200 W per meter Kelvin (W / (nvK)), at 23 ° C and a relative humidity of 50% as measured using the transient plane source (MTPS) method.
[00104] The thickness of the barrier can be adjusted appropriately to achieve a good performance when smoking. In certain embodiments, the barrier can have a thickness of between approximately 10 microns and approximately 500 microns.
[00105] The barrier can be formed from one or more suitable materials that are substantially thermally stable and non-combustible at temperatures reached by the combustible heat source during ignition and combustion. Suitable materials are known in the art and include, but are not limited to, clays (such as, for example, bentonite and kaolinite), glass, minerals, ceramic materials, metals, resins and combinations thereof.
[00106] Preferred materials from which the barrier can be formed include clays and glass. Most preferred materials from which the barrier can be formed include copper, aluminum, stainless steel, alloys, alumina (AI203), resins and mineral glues.
[00107] In one embodiment, the barrier comprises a clay coating that includes a 50/50 mixture of bentonite and kaolinite provided on the rear face of the combustible heat source. In a more preferred embodiment, the barrier comprises an aluminum coating provided on a 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 a rear face of the combustible heat source.
[00108] Preferably, the barrier is at least approximately 10 microns thick. Due to the low permeability of clays to air, in embodiments where the barrier comprises a clay coating provided on the rear face of the combustible heat source the clay coating most preferably has a thickness of at least approximately 50 microns, and more preferably between approximately 50 micron and approximately 350 micron. In embodiments where the barrier is formed from one or more materials that are more impermeable to air, such as aluminum, the barrier may be thinner, and will generally preferably have a thickness of less than approximately 100 microns, and more preferably approximately 20 microns. In embodiments where the barrier comprises a glass coating provided on the rear face of the combustible heat source, the glass coating preferably has a thickness of less than approximately 200 microns. The barrier thickness can be measured using a microscope, a scanning electron microscope (SEM / SEM) or any other suitable measurement methods known in the art.
[00109] Where the barrier comprises a barrier coating provided on a rear face of the combustible heat source, the barrier coating can be applied to cover and adhere to the rear face of the combustible heat source by any appropriate methods known in the art including , but not limited to, spray coating, vapor deposition, immersion, material transfer (eg brushing or bonding), electrostatic deposition or any combination thereof.
[00110] For example, the barrier coating can be made by pre-forming a barrier in the approximate size and shape of the rear face of the combustible heat source, and applying it, to the rear face of the combustible heat source to cover and adhere to at least substantially the entire rear face of the combustible heat source. Alternatively, the first barrier coating can be cut or otherwise machined after it is applied to the rear face of the combustible heat source. In a preferred embodiment, the aluminum foil is applied to the rear face of the combustible heat source, by gluing or pressing it on the combustible heat source, and is cut or otherwise machined so that the aluminum foil covers and it adheres at least substantially to the entire rear face of the combustible heat source, preferably to the entire rear face of the combustible heat source.
[00111] In another preferred embodiment, the barrier coating is formed by applying a solution or suspension of one or more coating materials suitable for the rear face of the combustible heat source. For example, the barrier coating can be applied to the rear face of the combustible heat source by dipping the rear face of the combustible heat source in a solution or suspension of one or more suitable coating materials or by brushing or spray coating a solution or suspension or electrostatically deposit a powder or powder mixture of one or more suitable coating materials on the back face of the combustible heat source. Where the barrier coating is applied to the rear face of the combustible heat source by electrostatic deposition of a powder or powder mixture of one or more suitable coating materials on the rear face of the combustible heat source, the rear face of the combustible heat source it is preferably pre-treated with water before electrostatic deposition. Preferably, the barrier coating is applied by spray coating.
[00112] The barrier coating can be formed through a single application of a solution or suspension of one or more coating materials suitable to the rear face of the combustible heat source. Alternatively, the barrier coating may be formed by various applications of a solution or suspension of one or more coating materials suitable for the rear face of the combustible heat source. For example, the barrier coating may be formed by means of one, two, three, four, six, seven or eight successive applications of a solution or suspension of one or more coating materials suitable for the rear face of the combustible heat source.
[00113] Preferably, the barrier coating is formed is formed through between one and ten applications of a solution or suspension of one or more coating materials suitable to the rear face of the combustible heat source.
[00114] After applying the solution or suspension of one or more coating materials to the back face thereof, the source of combustible heat can be dried to form the barrier coating.
[00115] Where the barrier coating is formed by means of various applications of a solution or suspension of one or more coating materials suitable to the back face thereof, the source of combustible heat may need to be dried between successive applications of the solution or suspension .
[00116] Alternatively or in addition to drying, after applying a solution or suspension of one or more coating materials to the back face of the combustible heat source, the coating material over the combustible heat source can be sintered so forming the barrier coating. Sintering of 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 of between approximately 500 ° C and approximately 900 ° C, and more preferably at approximately 700 ° C.
[00117] In certain embodiments, the smoking articles according to the invention may comprise heat sources that do not comprise any air flow channels. The heat sources of smoking articles according to such embodiments are referred to herein as blind heat sources.
[00118] In smoking articles according to the invention comprising blind heat sources, the transfer of heat from the heat source to the aerosol-forming substrate occurs mainly by conduction and heating of the aerosol-forming substrate by convection is minimized or reduced. This advantageously helps to minimize or reduce the impact of a user's puffing regime on the aerosol composition of the mainstream of smoking articles according to the invention comprising blind heat sources.
[00119] It will be appreciated that the smoking articles according to the invention may comprise blind heat sources comprising one or more closed or blocked passages through which air cannot be drawn in by a user for inhalation. For example, the smoking articles according to the invention may comprise blind combustible heat sources comprising one or more closed passages extending from an end face upstream of the combustible heat source only part of the way along the length of the combustible heat.
[00120] In such embodiments, the inclusion of one or more closed air passages increases the surface area of the combustible heat source that is exposed to oxygen in the air and can advantageously facilitate the ignition and continuous combustion of the combustible heat source.
[00121] In other embodiments, the smoking articles according to the invention may comprise heat sources that comprise one or more air flow channels. Heat sources for smoking articles according to such embodiments are referred to herein as non-blind heat sources.
[00122] In smoking articles according to the invention comprising unblinded heat sources, heating of the aerosol-forming substrate occurs by conduction and convection. In use, when the user puffs on a smoking article according to the invention which comprises a non-blind heat source, the air is sucked downstream through one or more airflow channels along the heat source. The sucked air passes through the aerosol-forming substrate and then downstream towards the mouth end of the article for smoking through the second part of the air flow path.
[00123] Smoking articles according to the invention may comprise unblinded heat sources that comprise one or more closed airflow channels along the heat source.
[00124] As used herein, the term "contained" is used to describe the airflow channels that are surrounded by the heat source along its length.
[00125] For example, the smoking articles according to the invention may comprise non-blind combustible heat sources comprising one or more contained airflow channels that extend through the interior of the combustible heat source along the entire length of the combustible heat source.
[00126] Alternatively or additionally, smoking articles according to the invention may comprise unblinded heat sources that comprise one or more airflow channels not contained throughout the heat source.
[00127] For example, the smoking articles according to the invention may comprise non-blind combustible heat sources comprising one or more unchecked air flow channels that extend along the outside of the combustible heat source along at least least one part downstream of the entire length of the combustible heat source.
[00128] In certain embodiments, the smoking articles according to the invention may comprise non-blind sources of heat comprising one, two or three channels of air flow. In certain preferred embodiments, the smoking articles according to the invention comprise unblinded heat sources that comprise a single airflow channel that extends through the interior of the combustible heat source. In certain especially preferred embodiments, the smoking articles according to the invention comprise unblinded heat sources that comprise a single channel of substantially central or axial air flow that extends through the interior of the combustible heat source. In such embodiments, the diameter of the single airflow channel is preferably between approximately 1.5 mm and approximately 3 mm.
[00129] Where smoking articles according to the invention comprise a barrier comprising a barrier coating provided on a rear face of a non-blind combustible heat source comprising one or more airflow channels along the heat source fuel, the barrier coating must allow air to be sucked downstream through one or more airflow channels.
[00130] Where smoking articles according to the invention comprise non-blind combustible heat sources, the smoking articles may further comprise a substantially air-impermeable non-combustible barrier between the combustible heat source and one or more airflow channels to isolate the non-blind combustible heat source from the air extracted through the smoking article.
[00131] In some embodiments, the barrier may be adhered to or otherwise affixed to the source of combustible heat.
[00132] Preferably, the barrier comprises a barrier coating provided on an interior surface of one or more airflow channels. More preferably, the barrier comprises a barrier coating provided substantially over at least the entire interior surface of one or more airflow channels. More preferably, the barrier comprises a barrier coating provided over the entire interior surface of one or more airflow channels.
[00133] Alternatively, the barrier coating can be provided by inserting a coating / jacketing within one or more airflow channels. For example, where the smoking articles according to the invention may comprise non-blind combustible heat sources comprising one or more airflow channels extending through the interior of the combustible heat source, a hollow non-combustible tube substantially impermeable to Air can be inserted into one or each of the other airflow channels.
[00134] The barrier can advantageously significantly prevent or inhibit the entry of products formed during the ignition and combustion of the combustible heat source of the smoking articles according to the invention of the air sucked through the smoking articles along one or more more airflow channels.
[00135] The barrier can also advantageously significantly prevent or inhibit the activation of combustion of the combustible heat source of smoking articles according to the invention during a user's puffs.
[00136] Depending on the characteristics and the desired performance of the smoking article, the barrier may have a low thermal conductivity or a high thermal conductivity. Preferably, the barrier has a low thermal conductivity.
[00137] The thickness of the barrier can be adjusted appropriately to achieve a good performance when smoking. In certain embodiments, the barrier can have a thickness of between approximately 30 microns and approximately 200 microns. In a preferred embodiment, the barrier has a thickness of between approximately 30 microns and approximately 100 microns.
[00138] The barrier can be formed from one or more suitable materials that are substantially thermally stable and non-combustible at temperatures reached by the combustible heat source during ignition and combustion. Suitable materials are known in the art and include, but are not limited to, for example: clays; metal oxides, such as iron oxide, alumina, titania, silica, silica-alumina, zirconium and cerium oxide; zeolites; zirconium phosphate; and other ceramic materials or combinations thereof.
[00139] Preferred materials from which the barrier can be formed include clays, aluminum glass, iron oxide and their combinations. If desired, catalytic ingredients, such as components 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.
[00140] Where the smoking articles according to the invention comprise a barrier between an end downstream of the combustible heat source and an end upstream of the aerosol-forming substrate and a barrier between the combustible heat source and one or more airflow channels along the fuel heat source, the two barriers can be formed from the same material or different material or materials.
[00141] Where the barrier between the combustible heat source and one or more airflow channels includes a barrier coating provided on an interior surface of one or more airflow channels, the barrier coating can be applied to the surface of 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 one or more airflow channels can be sprayed, moistened, or painted with a barrier coating solution or suspension. In a preferred embodiment, the barrier coating is applied to the inner surface of one or more airflow channels by the process described in WO-A2-2009 / 074870 as the source of combustible heat is extruded.
[00142] 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 preforming 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 in a desired format, using any suitable known methods of ceramic formation such as, for example, liquid clay mass, extrusion , injection molding and matrix compaction. In certain preferred embodiments, the mixture is preformed into a desired shape, by extrusion.
[00143] Preferably, the mixture of one or more materials containing carbon, one or more binders and other additives is preformed on an elongated stem. However, it will be appreciated that the mixture of one or more carbon-containing materials, one or more binders and other additives can be preformed in other desired forms.
[00144] After forming, in particular, after extrusion, the elongated rod or otherwise desired, is preferably dried to reduce its moisture content and then pyrolyzed in a non-oxidizing atmosphere, at a temperature sufficient to carbonize one or more binders, when present, and substantially eliminate any volatiles in the elongated stem or otherwise. The elongated rod or other desired shape is preferably pyrolysed in a nitrogen atmosphere at a temperature of between approximately 500 ° C and approximately 900 ° C.
[00145] In one embodiment, at least one metal nitrate salt is incorporated into the combustible heat source including at least one metal nitrate precursor in the mixture of one or more carbon-containing materials, one or more binders and other additives. At least one metal nitrate precursor is then subsequently converted in situ to at least one metal nitrate salt, by treating the pyrolyzed preformed cylindrical rod or otherwise with an aqueous solution of nitric acid. In one embodiment, the combustible heat source comprises a nitrate salt of at least one metal having a thermal decomposition temperature less than approximately 600 ° C, more preferably less than approximately 400 ° C. Preferably, the nitrate salt of at least one metal has a decomposition temperature between approximately 150 ° C and approximately 600 ° C, more preferably between approximately 200 ° C and approximately 400 ° C.
[00146] In use, exposure of the combustible heat source to a conventional yellow flame lighter or other means of ignition should cause the nitrate salt of at least one metal to decompose and release oxygen and energy. This decomposition causes an initial boost in the temperature of the combustible heat source and also helps in igniting the combustible heat source. After the decomposition of the nitrate salt of at least one metal, the source of combustible heat, preferably continues to burn at a lower temperature.
[00147] The inclusion of at least one metal nitrate salt advantageously results in the ignition of the combustible heat source being started internally, and not just at a point on the surface thereof. Preferably, the nitrate salt of at least one metal is present in the fuel heat source in an amount of between approximately 20 percent dry weight and approximately 50 percent dry weight of the combustible heat source.
[00148] In another embodiment, the source of combustible heat comprises at least one peroxide or superoxide that actively develops oxygen at a temperature below approximately 600 ° C, more preferably at a temperature below approximately 400 ° C.
[00149] Preferably, at least one peroxide or superoxide actively develops oxygen at a temperature of between approximately 150 ° C and approximately 600 ° C, more preferably between approximately 200 ° C and approximately 400 ° C, more preferably approximately 350 ° C. In use, exposure of the combustible heat source to a conventional yellow flame lighter or other means of ignition must cause at least one peroxide or superoxide to decompose and release oxygen. This causes an initial boost in the temperature of the combustible heat source and also helps in igniting the combustible heat source. Following the decomposition of at least one peroxide or superoxide, the source of combustible heat preferably continues to burn at a lower temperature.
[00150] The inclusion of at least one peroxide or superoxide advantageously results in the ignition of the combustible heat source being started internally, and not just at a point on its surface.
[00151] The fuel heat source preferably has a porosity between approximately 20 percent and approximately 80 percent, more preferably between approximately 20 percent and 60 percent. Where the combustible heat source comprises a nitrate salt of at least one metal, this advantageously allows oxygen to propagate through the mass of the combustible heat source at a rate sufficient to maintain combustion according to the nitrate salt of at least one metal decomposes and combustion proceeds. Even more preferably, the fuel heat source has a porosity between approximately 50 percent and approximately 70 percent, more preferably between approximately 50 percent and 60 percent as measured, for example, by mercury porosimetry or helium pycnometry. The required porosity can be easily achieved during the production of the combustible heat source using conventional methods and technology.
[00152] Advantageously, carbonaceous combustible heat sources for use in smoking products according to the invention have an apparent density of between approximately 0.6 g / cm3 and approximately 1 g / cm3.
[00153] Preferably, the fuel heat source has a mass comprised between approximately 300 mg and approximately 500 mg, more preferably between approximately 400 mg and approximately 450 mg.
[00154] Preferably, the combustible heat source has a length of between approximately 7 mm and approximately 17 mm, more preferably between approximately 7 mm and approximately 15 mm, more preferably between approximately 7 mm and approximately 13 mm,
[00155] Preferably, the combustible heat source has a diameter between approximately 5 mm and approximately 9 mm, more preferably between approximately 7 mm and approximately 8 mm.
[00156] Preferably, the heat source is of substantially uniform diameter. However, the heat source may, alternatively, be tapered so that the diameter of the rear part of the heat source is greater than the diameter of the front part thereof. Particularly preferred are heat sources that are substantially cylindrical. The heat source can, for example, be a substantially circular cross-sectioned tapered cylinder or cylinder, a substantially elliptical cross-sectioned tapered cylinder or cylinder.
[00157] The smoking articles according to the invention preferably comprise an aerosol forming substrate that comprises at least one aerosol former. 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 operating temperature of the smoking article. Suitable aerosol builders are well known in the art and include, for example, polyhydric alcohols, polyhydric alcohol esters, such as glycerol mono-, di- or triacetate, and aliphatic esters of mono-, di-acids -or polycarboxylics, such as dimethyl dodecanedioate and dimethyl tetradecanedioate. Preferred aerosol builders for use in smoking articles according to the invention are polyhydric alcohols or mixtures thereof, such as triethylene glycol, 1,3-butanediol and, most preferably, glycerin.
[00158] In such embodiments, the isolation of the heat source from the aerosol forming substrate advantageously prevents or inhibits the migration of at least one aerosol former from the aerosol forming substrate to the heat source, during storage of the articles of smoke. In such embodiments, isolating the heat source from the air drawn through the smoking article can also advantageously prevent or substantially inhibit the migration of at least one aerosol former from the aerosol forming substrate to the heat source during use of smoking products.
[00159] Decomposition of at least one aerosol former during the use of smoking products is thus advantageously substantially avoided or reduced.
[00160] The heat source and the aerosol forming substrate of smoking articles according to the invention can substantially touch each other. Alternatively, the heat source and the aerosol forming substrate of smoking articles according to the invention can be spaced longitudinally apart from each other.
[00161] Preferably, smoking articles according to the invention further comprise a heat conducting element around and in direct contact with a rear part of the heat source and an adjacent front part of the aerosol forming substrate. The heat conducting element is preferably combustion resistant and oxygen limiting.
[00162] The conductive heat element is around and in direct contact with the peripheries both the rear part of the fuel heat source and the front part of the aerosol generating substrate. The heat conducting element provides a thermal connection between these two components of smoking articles according to the invention.
[00163] Heat conducting elements suitable for use in smoking articles according to the invention include, but are not limited to: sheet metal shells, such as, for example, aluminum foil shells, steel shells, shells iron sheet, and copper foil wrappers; alloy sheet shells.
[00164] In embodiments where the heat source is a combustible heat source, the rear part of the combustible heat source surrounded by the heat conducting element is preferably between approximately 2 mm and approximately 8 mm in length, more preferably approximately 3 mm and approximately 5 mm in length.
[00165] Preferably, the front part of the combustible heat source not surrounded by the heat conducting element is between approximately 4 mm and approximately 15 mm in length, more preferably between approximately 4 mm and approximately 8 mm in length.
[00166] Preferably, the aerosol forming substrate has a length of between approximately 5 mm and approximately 20 mm, more preferably between approximately 8 mm and approximately 12 mm.
[00167] In certain preferred embodiments, the aerosol-forming substrate extends at least approximately 3 mm downstream beyond the heat conducting element.
[00168] Preferably, the front part of the aerosol forming substrate surrounded by the heat conducting element is between approximately 2 mm and approximately 10 mm in length, more preferably between approximately 4 mm and approximately 6 mm. Preferably, the rear part of the aerosol forming substrate not surrounded by the heat conducting element is between approximately 3 mm and approximately 10 mm in length. In other words, the aerosol forming substrate preferably extends between approximately 3 mm and approximately 10 mm downstream beyond the heat conducting element. More preferably, the aerosol forming substrate extends at least approximately 4 mm downstream beyond the heat conducting element.
[00169] In other embodiments, the aerosol forming substrate may extend less than 3 mm downstream beyond the heat conducting element.
[00170] In still other embodiments, the entire length of the aerosol-forming substrate can be surrounded by the heat conducting element.
[00171] 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 response to heating. Preferably, the material capable of emitting volatile compounds in response to heating is a charge of plant-based material, more preferably a charge of homogenized plant-based material. For example, the aerosol-forming substrate may comprise one or more materials derived from plants, including, but not limited to: tobacco; tea, for example, green tea; pepper mint; blond; eucalyptus; basil; sage; verbena; and tarragon. The herbal material may comprise additives, including, but not limited to, humectants, flavorings, binders and mixtures thereof. Preferably, the herbal material consists essentially of tobacco material, more preferably homogenized tobacco material.
[00172] Smoking articles according to the invention preferably further comprise an expansion chamber downstream of the aerosol-forming substrate and, where present, downstream of the airflow directing element. The inclusion of an expansion chamber advantageously allows cooling of the aerosol generated by the transfer of heat from the combustible heat source to the aerosol forming substrate. The expansion chamber also advantageously allows the total length of the smoking articles according to the invention to be adjusted to a desired value, for example, to a length similar to that of conventional cigarettes, through an appropriate choice of the length of the expansion chamber . Preferably, the expansion chamber is an elongated hollow tube.
[00173] Smoking articles according to the invention may also comprise a mouthpiece downstream of the aerosol-forming substrate and, where present, downstream of the airflow directing element and expansion chamber. Preferably, the mouthpiece is of low filtration efficiency, more preferably of very low filtration efficiency. The mouthpiece can be a single segment or component mouthpiece. Alternatively, the mouthpiece can be a multi-segment mouthpiece or multiple components.
[00174] The mouthpiece may, for example, comprise a filter made of cellulose acetate, paper or other known suitable filter materials. 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.
[00175] The features described in relation to one aspect of the invention can also be applicable to another aspect of the invention. In particular, the characteristics described in relation to smoking articles and combustible heat sources according to the invention can also be applicable to methods according to the invention.
[00176] The invention will be further described, by way of example only, with reference to the attached drawings, in which:
[00177] Figure 1 shows a schematic longitudinal section of a smoking article according to a first embodiment of the invention;
[00178] Figure 2 shows a schematic longitudinal section of a smoking article according to a second embodiment of the invention;
[00179] Figure 3 shows a schematic longitudinal section of a smoking article according to a third embodiment of the invention; and
[00180] Figure 4 shows a schematic longitudinal section of a smoking article according to a fourth embodiment of the invention;
[00181] The smoking article 2 according to the first embodiment of the invention shown in Figure 1 comprises a blind carbonaceous fuel heat source 4, an aerosol-forming substrate 6, an air flow targeting element 8, a chamber expansion valve and a mouthpiece 12 in coaxial backrest alignment. The carbonaceous fuel heat source 4, aerosol-forming substrate 6, air flow directing element 8, elongated expansion chamber 10 and mouthpiece 12 are covered by an outer wrapping 14 of low air permeable cigarette paper.
[00182] The aerosol forming substrate 6 is located immediately downstream of the carbonaceous fuel heat source 4 and comprises a cylindrical plug 16 of tobacco material comprising glycerin as an aerosol forming agent and circumscribed by the filter plug wrap 18.
[00183] A non-combustible barrier, substantially impermeable to air is provided between the downstream end of the combustible heat source 4 and the upstream end of the aerosol forming substrate 6. As shown in Figure 1, the non-combustible barrier, substantially air-impervious consists of a non-combustible barrier coating 20, substantially air-impervious, which is provided across the rear face of the carbonaceous heat source 4.
[00184] A heat conducting element 22, consisting of a tubular layer of aluminum foil surrounds and is in direct contact with a rear part 4b of the carbonaceous heat source 4 and a front stop part 6a of the aerosol forming substrate 6. As shown in Figure 1, a rear part of the aerosol forming substrate 6 is not surrounded by the heat conducting element 22.
[00185] The air flow guiding element 8 is located downstream of the aerosol forming substrate 6 and comprises a hollow tube of open end substantially impermeable to air made of, for example, cardboard, which is of reduced diameter compared to the aerosol forming substrate 6. The upstream end of the open hollow tube 24 abuts the aerosol forming substrate 6. The downstream end of the open hollow tube 24 is surrounded by a substantially air-tight annular seal 26 of substantially the same diameter as the aerosol forming substrate 6. The remainder of the open hollow tube 24 is circumscribed by a permeable annular air diffuser 28 made of, for example, cellulose acetate filaments, which is substantially the same diameter as that of the aerosol-forming substrate 6.
The open end hollow tube 24, a substantially air-tight annular seal 26 and a permeable annular air diffuser 28 may be separate components which are adhered or otherwise connected together to form the flow-directing element air 8 prior to assembly of the smoking article 2. Alternatively, the hollow tube of open end 24, and the substantially air-tight annular seal 26 may be part of a single component that is adhered to or otherwise connected to an air diffuser permeable annular ring 28 separated to form the air flow guiding element 8 prior to assembly of the smoking article 2. In still other embodiments, the open hollow tube 24, a substantially air-tight annular seal 26 and a permeable annular air diffuser 28 can be parts of a single component. For example, the open hollow tube 24, a substantially air-tight annular seal 26 and a permeable annular air diffuser 28 may be parts of a single hollow tube of air-permeable material having a substantially air-impermeable coating layer applied to its inner surface and back.
[00187] As shown in Figure 1, the open hollow tube 24 and the permeable annular air diffuser 28 are circumscribed by an internal air-permeable housing 30.
[00188] As also shown in Figure 1, a circular arrangement of air inlets 32 is provided in the outer shell 14 circumscribing the inner shell 30.
[00189] The expansion chamber 10 is located downstream of the air flow guiding element 8 and comprises an open hollow tube 34 made of, for example, cardboard, which has substantially the same diameter as the aerosol forming substrate 6 .
[00190] The mouthpiece 12 of the smoking article 2 is located downstream of the expansion chamber 10 and comprises a cylindrical plug 36 of cellulose acetate filaments of very low filtration efficiency circumscribed by the filter plug wrap 38. The adapter mouthpiece 12 can be circumscribed by tip paper (not shown).
[00191] As described below, an air flow path extends between the air inlets 32 and the mouthpiece 12 of the smoking article 2 according to the first embodiment of the invention. The volume bounded by the outside of the open hollow tube 24 of the airflow directing element 8 and the inner casing 30 form a first part of the airflow path that extends longitudinally upstream from the air inlets 32 to the substrate of aerosol formation 6. The volume bounded by the interior of the open hollow tube 24 of the airflow directing element 8 forms a second part of the airflow pathway that extends longitudinally downstream towards the mouthpiece 12 of the article for smoking 2, between the aerosol forming substrate 6 and the expansion chamber 10.
[00192] In use, when a user sucks on the mouthpiece 12 of the smoking article 2 according to the first embodiment of the invention, cold air (indicated by the dashed arrows in Figure 1) is drawn into the smoking article 2 by means of of the air inlets 32 and the inner shell 30. The sucked air passes upstream to the aerosol forming substrate 6 along the first part of the air flow path between the outside of the open hollow tube 24 of the flow directing element air 8 and the inner shell 30 and through the permeable annular air diffuser 28.
[00193] The front part 6a of the aerosol-forming substrate 6 is heated by conduction through the back stop part 4b of the carbonaceous heat source 4 and the heat conducting element 22. Heating of the aerosol-forming substrate 6 releases volatile and semi-volatile compounds and glycerin from tobacco material plug 16, which forms an aerosol that is entrained in the aspirated air as it flows through the aerosol-forming substrate 6. The entrained aspirated and aerosol air (indicated by the dashed arrows and dotted in Figure 1) passes downstream along the second part of the air flow path through the interior of the open hollow tube 24 of the air flow directing element 8 to the expansion chamber 10, where it cools and condenses. The cooled aerosol then passes downstream through the mouthpiece 12 of the smoking article 2 according to the first embodiment of the invention into the user's mouth.
[00194] The non-combustible barrier liner 20, substantially impermeable to the air supplied on the rear face of the carbonaceous fuel heat source 4 isolates the carbonaceous fuel heat source 4 from the airflow path through the smoking article 2 such that , in use, the air extracted through the smoking article 2 along the first part and the second part of the air flow path does not directly contact the carbonaceous heat source 4.
[00195] The smoking article 40 according to the second embodiment of the invention shown in Figure 2 is of similar construction to the smoking product according to the first embodiment of the invention shown in Figure 1; the same reference numbers are used in Figure 2, for the parts of the smoking article 40 according to the second embodiment of the invention corresponding to the parts of the smoking article 2 according to the first embodiment of the invention shown in Figure 1 and described above .
[00196] As shown in Figure 2, the smoking article 40 according to the second embodiment of the invention differs from the smoking article 2 according to the first embodiment of the invention, shown in Figure 1 in the sense that the open hollow tube 24 of the air flow directing element 8 is not circumscribed by a permeable annular air diffuser 28. The smoking article 40 according to the second embodiment of the invention also differs from the smoking article 2 according to the first embodiment of the invention shown in Figure 1, wherein the upstream end of the open hollow tube 24 extends into the inside of the aerosol forming substrate 6.
[00197] In use, when a user draws on the mouthpiece 12 of the smoking article 40 according to the second embodiment of the invention, the cold air (indicated by the dashed arrows in Figure 2) is drawn into the smoking article 40 by through the air inlets 32. The sucked air passes upstream to the aerosol forming substrate 6 along the first part of the airflow path between the outside of the open hollow tube 24 of the airflow directing element 8 and the inner shell 30.
[00198] The front part 6 of the aerosol forming substrate 6 of the smoking article 40 according to the second embodiment of the invention is heated by conduction through the back stop part 4b of the carbonaceous heat source 4 and the conductive element of heat 22. Heating of the aerosol-forming substrate 6 releases volatile and semi-volatile compounds and glycerin from the tobacco material plug 16, which forms an aerosol that is entrained in the aspirated air as it flows through the aerosol-forming substrate 6. The aspirated air and entrained aerosol (indicated by the dashed and dotted arrows in Figure 2) pass downstream along the second part of the air flow path through the interior of the open hollow tube 24 of the air flow direction element 8 to the expansion chamber 10, where it cools and condenses. The cooled aerosol then passes downstream through the mouthpiece 12 of the smoking article 40 according to the second embodiment of the invention into the user's mouth.
[00199] The non-combustible barrier liner 20, substantially impermeable to the air supplied on the rear face of the carbonaceous fuel heat source 4 isolates the carbonaceous fuel heat source 4 from the airflow path through the smoking article 40 such that In use, the air extracted through the smoking article 40 along the first part and the second part of the air flow path does not directly contact the carbonaceous heat source 4.
[00200] The smoking article 50 according to the third embodiment of the invention shown in Figure 3 is also similar in construction to the smoking product according to the first embodiment of the invention shown in Figure 1; the same reference numbers are used in Figure 3, for the smoking article parts 50 according to the third embodiment of the invention corresponding to the smoking article parts 2 according to the first embodiment of the invention shown in Figure 1 and described above .
[00201] As shown in Figure 3, the construction of the airflow targeting element 8 of the smoking article 50 according to the third embodiment of the invention differs from that of the airflow targeting element 8 of the smoking article according to with the first embodiment of the invention shown in Figure 1. In the third embodiment of the invention, the air flow directing element 8 is located downstream of the aerosol forming substrate 6 and comprises a substantially impermeable open end hollow truncated hollow cone air 52 made of, for example, cardboard. The downstream end of the open truncated hollow cone 52 has substantially the same diameter as the aerosol forming substrate 6 and the upstream end of the open truncated hollow cone 52 has a reduced diameter compared to the aerosol forming substrate 6.
[00202] The upstream end of the open truncated hollow cone 52 abuts the aerosol-forming substrate 6 and is circumscribed by a permeable annular air diffuser 54 made of, for example, cellulose acetate filaments, which is substantially the same diameter than that of the aerosol-forming substrate 6 and is circumscribed by wrapper of the filter plug 56.
[00203] As shown in Figure 3, the part of the open truncated hollow cone 52 that is not circumscribed by the permeable annular air diffuser 54 is circumscribed by an inner shell 58 of low air permeability made of, for example, cardboard.
[00204] As also shown in Figure 3, a circular arrangement of air inlets 32 is provided in the outer shell 14 and the inner shell 58 circumscribing the open truncated hollow cone 52 downstream of the permeable annular air diffuser 54.
[00205] An air flow path extends between the air inlets 32 and the mouthpiece 12 of the smoking article 50 according to the third embodiment of the invention. The volume bounded by the exterior of the open truncated hollow cone 52 of the airflow directing element 8 and the inner shell 56 form a first part of the airflow path that extends longitudinally upstream from the air inlets 32 to the aerosol forming substrate 6. The volume bounded by the interior of the open truncated hollow cone 52 of the airflow directing element 8 forms a second part of the airflow pathway that extends longitudinally downstream towards the mouthpiece 12 of the smoking article 50, between the aerosol forming substrate 6 and the expansion chamber 10.
[00206] In use, when a user sucks on the mouthpiece 12 of the smoking article 50 according to the third embodiment of the invention, the cold air (indicated by the dashed arrows in Figure 3) is drawn into the smoking article 50 through the air inlets 32. The sucked air passes upstream to the aerosol-forming substrate 6 along the first part of the airflow path between the exterior of the open truncated hollow cone 52 of the airflow directing element air 8 and the inner shell 56 and through the permeable annular air diffuser 54.
[00207] The front part 6 of the aerosol forming substrate 6 of the smoking article 50 according to the third embodiment of the invention is heated by conduction through the back stop part 4b of the carbonaceous heat source 4 and the conductive element of heat 22. Heating of the aerosol-forming substrate 6 releases volatile and semi-volatile compounds and glycerin from the tobacco material plug 16, which forms an aerosol that is entrained in the aspirated air as it flows through the aerosol-forming substrate 6. The aspirated air and entrained aerosol (indicated by the dashed and dotted arrows in Figure 3) pass downstream along the second part of the air flow path through the interior of the open truncated hollow cone 52 of the air flow targeting element 8 to the expansion chamber 10, where it cools and condenses. The cooled aerosol then passes downstream through the mouthpiece 12 of the smoking article 50 according to the third embodiment of the invention into the user's mouth. The non-combustible barrier coating 20, substantially impermeable to the air supplied on the rear face of the carbonaceous fuel heat source 4 isolates the carbonaceous fuel heat source 4 from the airflow path through the smoking article 50 such that, in use , the air extracted through the smoking article 50 along the first part and the second part of the air flow path does not directly contact the carbonaceous heat source 4.
[00208] As shown in Figure 4, smoking article 60 according to the fourth embodiment of the invention differs from smoking article 50 according to the third embodiment of the invention shown in Figure 3 in that the upstream end of the hollow cone substantially air-tight open end truncated 52 of the airflow directing element 8 extends into the aerosol forming substrate 6 and is not circumscribed by a permeable annular air diffuser 54. The smoking article 60 according to the fourth embodiment of the invention further differs from the smoking article 50 according to the third embodiment of the invention, shown in Figure 3 in the sense that the open truncated hollow cone 52 is not circumscribed by an inner shell 58.
[00209] In use, when a user draws on the mouthpiece 12 of the smoking article 60 according to the fourth embodiment of the invention, the cold air (indicated by the dashed arrows in Figure 4) is drawn into the smoking article 60 by through the air inlets 32. The sucked air passes upstream to the aerosol-forming substrate 6 along the first part of the airflow path between the exterior of the open end truncated hollow cone 52 of the airflow directing element air 8 and outer shell 14.
[00210] The front part 6 of the aerosol forming substrate 6 of the smoking article 60 according to the fourth embodiment of the invention is heated by conduction through the back stop part 4b of the carbonaceous heat source 4 and the conductive element of heat 22. Heating of the aerosol-forming substrate 6 releases volatile and semi-volatile compounds and glycerin from the tobacco material plug 16, which forms an aerosol that is entrained in the aspirated air as it flows through the aerosol-forming substrate 6. The aspirated air and entrained aerosol (indicated by the dashed and dotted arrows in Figure 4) pass downstream along the second part of the air flow path through the interior of the open truncated hollow cone 52 of the air flow targeting element 8 to the expansion chamber 10, where it cools and condenses. The cooled aerosol then passes downstream through the mouthpiece 12 of the smoking article 60 according to the fourth embodiment of the invention into the user's mouth.
[00211] The non-combustible barrier liner 20, substantially impermeable to the air provided on the rear face of the carbonaceous fuel heat source 4 isolates the carbonaceous fuel heat source 4 from the airflow path through the smoking article 60 such that In use, the air extracted through the smoking article 60 along the first part and the second part of the air flow path does not directly contact the carbonaceous heat source 4.
[00212] Smoking articles according to the first, second and third embodiments of the invention shown in Figures 1, 2 and 3, respectively, and having the dimensions indicated in Table 1 were assembled.
[00213] The embodiments shown in Figures 1 to 4 and described above illustrate, but do not limit the invention. Other embodiments of the invention can be made without departing from the spirit and scope of the same, and it is to be understood that the specific embodiments described in this document are not limiting.

权利要求:
Claims (16)
[0001]
1. Smoking article (2, 40, 50, 60) which has an end of the mouth and a distal end, the smoking article characterized by the fact that it comprises: a heat source (4); an aerosol-forming substrate (6) downstream of the heat source (4); at least one air inlet (32) downstream of the aerosol forming substrate (6); and an air flow path extending between at least one air inlet (32) and the mouth end of the smoking article (2, 40, 50, 60), where the air flow path comprises a first part extending longitudinally upstream from at least one air inlet (32) towards the aerosol forming substrate (6) and a second part extending longitudinally downstream of the first part towards the mouth end of the smoking article (2, 40, 50, 60); an airflow targeting element (8) downstream of the aerosol forming substrate (6), the airflow targeting element (8) defining the first part of the airflow path and the second part of the path air flow, wherein the air flow guiding element (8) comprises an open end hollow body substantially impermeable to air (24, 52), and in which at least part of the length of the open end hollow body substantially impermeable to air (24, 52) is circumscribed by an air-permeable diffuser (28, 54).
[0002]
2. Smoking article (2, 40, 50, 60), according to claim 1, characterized by the fact that the first part of the air flow path extends upstream from at least one air inlet ( 32) for the aerosol forming substrate (6) and the second part of the airflow path extends downstream of the aerosol forming substrate (6) towards the mouth end of the smoking article (2, 40, 50, 60).
[0003]
3. Smoking article (2, 40, 50, 60), according to claim 1, characterized by the fact that the first part of the air flow path extends upstream from at least one air inlet ( 32) for the aerosol forming substrate (6) and the second part of the airflow path extends downstream from within the aerosol forming substrate (6) towards the mouth end of the smoking article (2, 40, 50, 60).
[0004]
4. Smoking article (2, 40, 50, 60) according to any one of claims 1 to 3, characterized by the fact that the first part of the air flow path and the second part of the air flow path are concentric.
[0005]
5. Smoking article (2, 40, 50, 60) according to any one of claims 1 to 4, characterized in that the first part of the air flow path surrounds the second part of the air flow path .
[0006]
Smoking article (2, 40, 50, 60) according to any one of claims 1 to 5, characterized by the fact that the first part of the air flow path and the second part of the air flow path are of substantially constant cross-section.
[0007]
7. Smoking article (2, 40, 50, 60) according to any one of claims 1 to 5, characterized by the fact that the cross section of the first part of the airflow path increases with the first part of the path The airflow path extends upstream and the cross section of the second part of the airflow path increases as the second part of the airflow path extends downstream.
[0008]
Smoking article (2, 40, 50, 60) according to any one of claims 1 to 7, characterized in that the hollow body (24) is a straight circular cylinder (24).
[0009]
Smoking article (2, 40, 50, 60) according to any one of claims 1 to 7, characterized in that the hollow body (24) is a truncated straight circular cone (52).
[0010]
10. Smoking article (2, 40, 50, 60), according to any of the preceding claims, characterized by the fact that the hollow body of open air impermeable end (24, 52) extends a distance of up to 0 , 5 L for the aerosol forming substrate (6), where L is the length of the aerosol forming substrate (6).
[0011]
11. Smoking article (2, 40, 50, 60), according to any of the previous claims, characterized by the fact that the heat source (4) is a source of combustible heat.
[0012]
12. Smoking article (2, 40, 50, 60), according to the vindication king 11, characterized by the fact that the source of combustible heat is a source of carbonaceous heat.
[0013]
13. Smoking article (2, 40, 50, 60), according to king-vindication 11 or 12, characterized by the fact that the source of combustible heat (4) is isolated from the air flow path in such a way that the air drawn in along the air flow path does not come into direct contact with the combustible heat source.
[0014]
14. Smoking article (2, 40, 50, 60) according to any one of the preceding claims, characterized in that the heat source (4) is a blind heat source.
[0015]
15. Smoking article (2, 40, 50, 60), according to any one of the preceding claims, characterized by the fact that it further comprises: a heat conducting element (22) around and in contact with a rear part ( 4b) of the heat source (4) and a front part (6a) of the aerosol forming substrate (6).
[0016]
16. Method for reducing or eliminating temperature increases of an aerosol-forming substrate (6) of a smoking article (2, 40, 50, 60) during puffs, the method characterized by the fact that it comprises the supply of a smoking article (2, 40, 50, 60) which includes: a heat source (4); an aerosol-forming substrate (6) downstream of the heat source (4); at least one air inlet (32) downstream of the aerosol forming substrate (6); an air flow path extending between at least one air inlet (32) and an end of the mouth of the smoking article, where the air flow path comprises a first part extending longitudinally upstream from the at least one air inlet (32) towards the aerosol forming substrate (6) and a second part that extends longitudinally downstream of the first part towards the mouth end of the smoking article (2, 40, 50, 60); and an airflow targeting element (8) downstream of the aerosol forming substrate (6), the airflow targeting element (8) defining the first part of the airflow path and the second part of the air flow path, wherein the air flow directing element (8) comprises an open end hollow body substantially impermeable to air (24, 52), and at least part of the length of the end hollow body substantially open air-tight (24, 52) is circumscribed by an air-permeable diffuser (28, 54), such that, in use, the air sucked into the smoking article (2, 40, 50, 60) through at least one air inlet (32) passes upstream through the first part of the airflow path towards the aerosol forming substrate (6) and then downstream towards the mouth end of the article to smoking (2, 40, 50, 60) through the second part of the air flow path.

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US20190254335A1|2018-02-22|2019-08-22|R.J. Reynolds Tobacco Company|System for debossing a heat generation member, a smoking article including the debossed heat generation member, and a related method|

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CN111902055A|2018-04-10|2020-11-06|菲利普莫里斯生产公司|Aerosol-generating article comprising a heatable element|

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CN112074199A|2018-04-27|2020-12-11|Jt国际股份公司|Smoking article, smoking system and method for generating aerosol|

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CN109393550A|2018-10-31|2019-03-01|云南恒罡科技有限公司|A kind of sealing mode heating not combustion products|

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EP3852555A1|2018-12-17|2021-07-28|Philip Morris Products S.A.|Aerosol generating article comprising a heat source|

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CN109700081A|2019-03-06|2019-05-03|福建中烟工业有限责任公司|A kind of mouth stick and smoking article for smoking article|

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WO2021044020A1|2019-09-06|2021-03-11|Philip Morris Products S.A.|Aerosol-generating device with sealing elements in cavity|

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WO2021179110A1|2020-03-09|2021-09-16|徐毅|Heat-not-burn cigarette and packaging material thereof|

法律状态:
2018-12-04| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|

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2019-12-03| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|

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2020-07-21| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|

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2020-10-06| 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 12/02/2013, OBSERVADAS AS CONDICOES LEGAIS. |

优先权:

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申请号 | 申请日 | 专利标题

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EP12155238|2012-02-13|

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EP12155238.4|2012-02-13|

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PCT/EP2013/052792|WO2013120854A1|2012-02-13|2013-02-12|Smoking article with improved airflow|

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