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    • 专利摘要:
    HEATED AEROSOL GENERATION ARTICLE. The invention relates to an aerosol generating article (10) which comprises a plurality of elements assembled in the form of a rod (11). The elements include an aerosol-forming substrate (20) and an aerosol-cooling element (40) located downstream of the aerosol-forming substrate (20). The aerosol cooling element (40) comprises a plurality of channels that extend longitudinally and have a porosity between 50% and 90% in the longitudinal direction. The aerosol cooling element can have a total surface area between 300 mm2 per mm in length and 1,000 mm2 per mm in length. An aerosol that passes through the aerosol cooling element (40) is cooled and, in some embodiments, water is condensed within the aerosol cooling element (40).
    公开号:BR112014019942B1
    申请号:R112014019942-6
    申请日:2012-12-28
    公开日:2020-11-10
    发明作者:Gérard Zuber；Cédric Meyer；Daniele Sanna；Alexis Louvet
    申请人:Philip Morris Products S.A.；
    IPC主号:
    专利说明:

    [001] The present specification refers to an aerosol generating article which comprises an aerosol forming substrate and an aerosol cooling element for cooling an aerosol formed from the substrate.
    [002] Aerosol generating articles in which an aerosol-forming substrate, such as a tobacco-containing substrate, is heated instead of undergoing combustion are known in the art. Examples of systems that use aerosol generating articles include systems that heat a substrate that contains tobacco above 200 degrees Celsius to produce an aerosol that contains nicotine. Such systems may use a chemical or gas heater, such as the system sold under the trade name Ploom.
    [003] The purpose of such systems using heated aerosol generation articles is to reduce known harmful smoke constituents produced by the combustion and pyrolytic degradation of tobacco in conventional cigarettes. Typically, in such heated aerosol generating articles, an inhalable aerosol is generated by transferring heat from a heat source to a physically separated aerosol forming material or substrate that may be located inside or downstream of the heat source. During consumption of the aerosol-generating article, volatile compositions are released from the aerosol-forming substrate by heat transfer from the heat source and rise in the air extracted through the aerosol-generating article. As the released compositions cool, they condense to form an aerosol that is inhaled by the consumer.
    [004] Conventional cigarettes burn tobacco and generate temperatures that release volatile compositions. Temperatures in Tobacco burning tobacco can reach above 800 degrees Celsius and such high temperatures remove much of the water contained in the smoke released from the tobacco. The main smoke produced by conventional cigarettes tends to be perceived by a smoker as having a low temperature due to the fact that it is relatively dry. An aerosol generated by heating an aerosol-forming substrate without burning may have a higher water content due to the temperatures below which the substrate is heated. Regardless of the lower temperature of aerosol formation, the aerosol flow generated by such systems can have a perceived temperature higher than that of conventional cigarette smoke.
    [005] The specification refers to an aerosol generating article and a method of using an aerosol generating article.
    [006] In one embodiment, an aerosol generating article comprising a plurality of elements assembled in the form of a rod is provided. The plurality of elements includes an aerosol-forming substrate and an aerosol-cooling element located downstream of the aerosol-forming substrate within the stem. The aerosol cooling element comprises a plurality of channels that extend longitudinally and have a porosity between 50% and 90% in the longitudinal direction. The aerosol cooling element can alternatively be referred to as a heat exchanger based on its functionality, as further described in this document.
    [007] As used herein, the term aerosol generating article is used to denote an article comprising an aerosol-forming substrate that can release volatile compositions that can form an aerosol. An aerosol generating article can be a non-combustible aerosol generating article which is an article that releases volatile compositions without combustion of the aerosol forming substrate. An aerosol generating article may be a heated aerosol generating article which is an aerosol generating article comprising an aerosol forming substrate that is intended to be heated instead of undergoing combustion in order to release volatile compositions that may form an aerosol. A heated aerosol generating article may comprise an integrated heating means that forms part of the aerosol generating article or may be configured to interact with an external heater that forms part of a separate aerosol generating device.
    [008] An aerosol generating article can be a smoking article that generates an aerosol that is inhaled directly into a user's lungs through the user's mouth. An aerosol generating article may resemble a conventional smoking article, such as a cigarette, and may comprise tobacco. An aerosol generating article may be disposable. An aerosol generating article may alternatively be partially reusable and comprise a renewable or replaceable aerosol forming substrate.
    [009] As used herein, the term "aerosol-forming substrate" refers to a substrate that can release volatile compositions that can form an aerosol. Such volatile compositions can be released by heating the aerosol-forming substrate. An aerosol-forming substrate can be adsorbed, coated, impregnated or otherwise loaded onto a vehicle or support. An aerosol-forming substrate may conveniently be part of an aerosol-generating article or smoke article.
    [0010] An aerosol-forming substrate may comprise nicotine. An aerosol-forming substrate may comprise tobacco, for example, it may comprise a tobacco-containing material that contains volatile tobacco flavor compositions that are released from the aerosol-forming substrate upon heating. In preferred embodiments, an aerosol-forming substrate may comprise homogenized tobacco material, for example, reconstituted tobacco.
    [0011] As used herein, an "aerosol generating device" refers to a device that interacts with an aerosol-forming substrate to generate an aerosol. The aerosol forming substrate forms part of an aerosol generating article, for example, part of a smoke article. An aerosol generating device can comprise one or more components used to supply energy from a power source to an aerosol-forming substrate to generate an aerosol.
    [0012] An aerosol generating device can be described as a heated aerosol generating device which is an aerosol generating device comprising a heater. The heater is preferably used to heat an aerosol forming substrate from an aerosol generating article to generate an aerosol.
    [0013] An aerosol generating device may be an electrically heated aerosol generating device that is an aerosol generating device comprising a heater that is operated by electrical energy to heat an aerosol forming substrate from an article of aerosol generation to generate an aerosol. An aerosol generating device can be a gas heated aerosol generating device. An aerosol generating device can be a smoking device that interacts with an aerosol forming substrate of an aerosol generating article to generate an aerosol that is inhalable directly into a user's lungs through the user's mouth.
    [0014] As used herein, "aerosol cooling element" refers to a component of an aerosol-generating article located downstream of the aerosol-forming substrate so that, in use, an aerosol formed by the compositions volatiles released from the aerosol forming substrate pass through it and are cooled by the aerosol cooling element before being inhaled by a user. Preferably, the aerosol cooling element is positioned between the aerosol forming substrate and the nozzle. An aerosol cooling element has a large surface area, but causes a low pressure drop. Filters and other nozzles that produce a high pressure drop, for example, filters formed from bundles of fibers, should not be considered as aerosol cooling elements. Chambers and cavities within an aerosol generating article are not considered to be aerosol cooling elements.
    [0015] As used herein, the term "rod" is used to denote a generally cylindrical element of substantially circular, oval or elliptical cross-section.
    [0016] The plurality of channels that extend longitudinally can be defined by a sheet material that has been crimped, pleated, joined or bent to form the channels. The plurality of longitudinally extending channels can be defined by a single blade that has been pleated, joined or folded to form multiple channels. The blade can also be crimped. Alternatively, the plurality of longitudinally extending channels can be defined by multiple sheets that have been crimped, pleated, joined or folded to form multiple channels.
    [0017] As used in this document, the term 'blade' denotes a laminated element that has a width and length substantially greater than its thickness.
    [0018] As used in this document, the term "longitudinal direction" refers to a direction that extends along or parallel to the cylindrical axis of a stem.
    [0019] As used in this document, the term "crimp" denotes a blade that has a plurality of substantially parallel grooves or corrugations. Preferably, when the aerosol generating article is assembled, the substantially parallel corrugations or grooves extend in a longitudinal direction in relation to the stem.
    [0020] As used herein, the terms "joined", "pleated" or "folded" denote that a sheet of material is convoluted, folded or otherwise compressed or restricted substantially transversely to the cylindrical axis of the stem. A blade can be crimped before being joined, pleated or folded. A blade can be joined, pleated or folded without prior crimping.
    [0021] The aerosol cooling element can have a total surface area between 300 mm2 per mm in length and 1,000 mm2 per mm in length. The aerosol cooling element can alternatively be called a heat exchanger.
    [0022] The aerosol cooling element preferably offers a low resistance to the passage of air through the rod. Preferably, the aerosol cooling element does not substantially affect the resistance to extract the aerosol generating article. The extraction resistance (RTD) is the pressure required to force air through the total length of the object under test at a rate of 17.5 ml / sec at 22 ° C and 101 kPa (760 Torr). RTD is usually expressed in units of mmFW and is measured according to ISO 6565: 2011. Therefore, it is preferred that there is a low pressure drop from an end upstream of the aerosol cooling element to an end downstream of the aerosol cooling element. To achieve this, it is preferable that the porosity in a longitudinal direction is greater than 50% and that the air flow path through the aerosol cooling element is relatively uninhabited. The longitudinal porosity of the aerosol cooling element can be defined by a ratio of the cross-sectional area of material that forms the aerosol-cooling element and an internal cross-sectional area of the aerosol-generating article in the portion containing the aerosol-generating element. aerosol cooling.
    [0023] The terms "upstream" and "downstream" can be used to describe relative positions of elements or components of the aerosol generating article. For simplicity, the terms "upstream" and "downstream", as used in this document, refer to a relative position along the stem of the aerosol generating article with reference to the direction in which the aerosol is extracted through the stem .
    [0024] It is preferable that an air flow through the aerosol cooling element does not deviate to a real extent between adjacent channels. In other words, it is preferred that the air flow through the aerosol cooling element is in a longitudinal direction along a longitudinal channel without substantial radial deviation. In some embodiments, the aerosol cooling element is formed of a material that has low porosity or substantially no porosity other than that of the longitudinally extending channels. That is, the material used to define or form the longitudinally extending channels, for example, a crimped and joined blade has low porosity or substantially no porosity.
    [0025] In some embodiments, the aerosol cooling element may comprise a sheet material selected from the group comprising a metal sheet, a polymer sheet and a substantially non-porous paper or cardboard. In some embodiments, the aerosol cooling element may comprise a blade material selected from the group consisting of polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polyethylene terephthalate (PET), polylactic acid (PLA), cellulose acetate (CA) and aluminum foil.
    [0026] After consumption, aerosol generation articles are usually discarded. It may be advantageous that the elements forming the aerosol generating article are biodegradable. Thus, it may be advantageous for the aerosol cooling element to be formed of a biodegradable material, for example, a non-porous paper or a biodegradable polymer such as polylactic acid or a grade of Mater-Bi® (a commercially available family of copolyesters based on starch). In some embodiments, the entire aerosol generating article is biodegradable or compostable.
    [0027] It is desirable that the aerosol cooling element has a high total surface area. Thus, in preferred embodiments, the aerosol cooling element is formed by a blade of a thin material that has been crimped and then pleated, joined or folded to form the channels. The more folds or folds within a given volume of the element, then, the greater the total surface area of the aerosol cooling element. In some embodiments, the aerosol cooling element may be formed of a material that has a thickness between about 5 micrometers and about 500 micrometers, for example, between about 10 micrometers and about 250 micrometers. In some embodiments, the aerosol cooling element has a total surface area between about 300 square millimeters per millimeter in length (mm2 / mm) and about 1,000 square millimeters per millimeter in length (mm2 / mm). In other words, for each millimeter of length in the longitudinal direction, the aerosol cooling element has between about 300 square millimeters and about 1,000 square millimeters of surface area. Preferably, the total surface area is about 500 mm2 / mm per mm.
    [0028] The aerosol cooling element can be formed from a material that has a specific surface area between about 10 square millimeters per milligram (mm2 / mg) and about 100 square millimeters per milligram (mm2 / mg). In some embodiments, the specific surface area can be about 35 mm2 / mg.
    [0029] A specific surface area can be determined by taking a material that has a known width and thickness. For example, the material can be a PLA material that has an average thickness of 50 micrometers with a range of ± 2 micrometers. Where the material also has a known width, for example, between about 200 millimeters and about 250 millimeters, the specific surface area and density can be calculated.
    [0030] When an aerosol containing a proportion of water vapor is extracted through the aerosol cooling element, part of the water vapor may condense on surfaces of the longitudinally defined channels through the aerosol cooling element. If the water condenses, it is preferable that droplets of the condensed water are kept in droplet form on a surface of the aerosol cooling element rather than being absorbed into the material forming the aerosol cooling element. Thus, it is preferred that the material forming the aerosol cooling element is substantially non-porous or substantially non-absorbent to water.
    [0031] The aerosol cooling element can act to cool the temperature of an aerosol flow extracted through the element by means of thermal transfer. Aerosol components will interact with the aerosol cooling element and loose thermal energy.
    [0032] The aerosol cooling element can act to cool the temperature of an aerosol stream extracted through the element by going through a phase transformation that consumes heat energy from the aerosol stream. For example, the material that forms the aerosol cooling element may undergo a phase transformation such as melting or a glass transition that requires the absorption of heat energy. If the element is selected so that it undergoes such an endothermic reaction at the temperature at which the aerosol enters the aerosol cooling element, then the reaction will consume heat energy from the aerosol stream.
    [0033] The aerosol cooling element can act to decrease the perceived temperature of an aerosol flow extracted through the element by causing condensation of components such as water vapor from the aerosol flow. Due to condensation, the aerosol stream may be drier after passing through the aerosol cooling element. In some embodiments, the water vapor content of an aerosol stream extracted through the aerosol cooling element can be decreased by between about 20% and about 90%. The user can perceive the temperature of this aerosol as being lower than a more humid aerosol of the same actual temperature. Thus, the sensation of aerosol in a user's mouth may be close to the sensation provided by the smoke flow of a conventional cigarette.
    [0034] In some embodiments, the temperature of an aerosol flow can be decreased by more than 10 degrees Celsius as it is extracted through an aerosol cooling element. In some embodiments, the temperature of an aerosol stream can be decreased by more than 15 degrees Celsius or more than 20 degrees Celsius as it is extracted through an aerosol cooling element.
    [0035] In some embodiments, the aerosol cooling element removes a proportion of the water vapor content of an aerosol extracted through the element. In some embodiments, a proportion of other volatile substances can be removed from the aerosol stream as the aerosol is extracted through the aerosol cooling element. For example, in some embodiments, a proportion of phenolic compositions can be removed from the aerosol stream as the aerosol is extracted through the aerosol cooling element.
    [0036] Phenolic compositions can be removed by interacting with the material that forms the aerosol cooling element. For example, phenolic compositions (for example, phenols and cresols) can be adsorbed by the material from which the aerosol cooling element is formed.
    [0037] Phenolic compositions can be removed by interacting with condensed water droplets within the aerosol cooling element.
    [0038] Preferably, more than 50% of main phenol yields are removed. In some embodiments, more than 60% of main phenol yields are removed. In some embodiments, more than 75% or more than 80% or more than 90% of main phenol yields are removed.
    [0039] As noted above, the aerosol cooling element can be formed by a blade of suitable material that has been crimped, pleated, joined or folded into an element that defines a plurality of channels that extend longitudinally. A cross-sectional profile of such an aerosol cooling element can show the channels as being randomly oriented. The aerosol cooling element can be formed by other means. For example, the aerosol cooling element can be formed by a bundle of tubes that extend longitudinally. The aerosol cooling element can be formed by extrusion, molding, lamination, injection or crushing of a suitable material.
    [0040] The aerosol cooling element may comprise an outer tube or casing that contains or locates the channels that extend longitudinally. For example, a pleated, joined or folded blade material can be wrapped in a wrapping material, for example, a buffer wrapper to form the aerosol cooling element. In some embodiments, the aerosol cooling element comprises a blade of crimped material that is joined in a rod shape and secured by a wrapper, for example, a filter paper wrapper.
    [0041] In some embodiments, the aerosol cooling element is formed in the shape of a rod that has a length between about 7 millimeters (mm) and about 28 millimeters (mm). For example, an aerosol cooling element can be about 18 mm long. In some embodiments, the aerosol cooling element may have a substantially circular cross-section and a diameter of about 5 mm to about 10 mm. For example, an aerosol cooling element can have a diameter of about 7 mm.
    [0042] The aerosol forming substrate can be a solid aerosol forming substrate. Alternatively, the aerosol forming substrate can comprise both solid and liquid components. The aerosol-forming substrate may comprise a tobacco-containing material that contains volatile tobacco flavor compositions that are released from the substrate after heating. Alternatively, the aerosol forming substrate may comprise a material other than tobacco. The aerosol forming substrate may further comprise an aerosol former. Examples of suitable aerosol builders are glycerin and propylene glycol.
    [0043] If the aerosol-forming substrate is a solid aerosol-forming substrate, the solid aerosol-forming substrate may comprise, for example, one or more of: powder, granules, pellets, strips, spaghetti, strips or strips which contain one or more of: grass leaf, tobacco leaf, fragments of tobacco veins, reconstituted tobacco, homogenized tobacco, extruded tobacco and expanded tobacco. The solid aerosol forming substrate can be in loose form or can be supplied in a suitable container or cartridge. For example, the aerosol forming material of the solid aerosol forming substrate may be contained within a paper or other wrapper and be in the form of a plug. Where an aerosol-forming substrate is in the form of a plug, the entire plug, which includes any wrapper, is considered to be the aerosol-forming substrate.
    [0044] Optionally, the solid aerosol-forming substrate may contain additional tobacco or volatile aroma compositions other than tobacco to be released after heating the solid aerosol-forming substrate. The solid aerosol-forming substrate may also contain capsules that, for example, include additional tobacco or volatile aroma compositions other than tobacco, and such capsules may melt during a heating of the solid aerosol-forming substrate.
    [0045] Optionally, the solid aerosol forming substrate can be supplied in or incorporated into a thermally stable vehicle. The vehicle may be in the form of powder, granules, pellets, strips, spaghetti, strips or blades. The solid aerosol-forming substrate can be deposited on the surface of the vehicle in the form of, for example, a slide, foam, gel or aqueous paste. The solid aerosol forming substrate can be deposited on the entire vehicle surface or, alternatively, can be deposited in a pattern to provide non-uniform aroma delivery during use.
    [0046] The elements of the aerosol generating article are preferably assembled by means of a suitable wrapping, for example, a cigarette paper. A cigarette paper can be any material suitable for packaging components of an aerosol generating article in the form of a rod. The cigarette paper needs to trap the component elements of the aerosol generating article when the article is assembled and keep them in position within the stem. Suitable materials are well known in the art.
    [0047] It may be particularly advantageous for an aerosol cooling element to be a component part of a heated aerosol generating article that has an aerosol forming substrate formed from or that comprises a homogenized tobacco material that has a forming content of aerosol greater than 5% on a dry weight and water basis. For example, the homogenized tobacco material can have an aerosol-forming content between 5% and 30% by weight on a dry weight basis. An aerosol generated from such aerosol forming substrates can be perceived by a user to have a particularly high temperature and the use of a high surface area, an aerosol cooling element with low RTD can reduce the perceived temperature of the aerosol to a acceptable level for the user.
    [0048] The aerosol generating article can be substantially cylindrical in shape. The aerosol generating article can be substantially elongated. The aerosol generating article may have a length and circumference substantially perpendicular to the length. The aerosol forming substrate can be substantially cylindrical in shape. The aerosol forming substrate can be substantially elongated. The aerosol forming substrate can also have a length and circumference substantially perpendicular to the length. The aerosol-forming substrate can be received in the aerosol-generating device so that the length of the aerosol-forming substrate is substantially parallel to the direction of air flow in the aerosol-generating device. The aerosol cooling element can be substantially elongated.
    [0049] The aerosol generating article can have a total length between approximately 30 mm and approximately 100 mm. The aerosol generating article can have an outside diameter between approximately 5 mm and approximately 12 mm.
    [0050] The aerosol generating article may comprise a filter or nozzle. The filter can be located at the downstream end of the aerosol generating article. The filter can be a cellulose acetate filter plug. The filter is approximately 7 mm long in one embodiment, but it can be between approximately 5 mm and approximately 10 mm long. The aerosol generating article may comprise a spacer element located downstream of the aerosol-forming substrate.
    [0051] In one embodiment, the aerosol generating article has a total length of approximately 45 mm. The aerosol generating article can have an outside diameter of approximately 7.2 mm. In addition, the aerosol forming substrate may be approximately 10 mm long. Alternatively, the aerosol forming substrate can be approximately 12 mm long. In addition, the diameter of the aerosol forming substrate can be between approximately 5 mm and approximately 12 mm.
    [0052] In one embodiment, a method of assembling an aerosol generating article comprising a plurality of elements assembled in the form of a rod is provided. The plurality of elements includes an aerosol-forming substrate and an aerosol-cooling element located downstream of the aerosol-forming substrate within the stem.
    [0053] In some embodiments, the cresol content of the aerosol is reduced as it is extracted through the aerosol cooling element.
    [0054] In some embodiments, the phenol content of the aerosol is reduced as it is extracted through the aerosol cooling element.
    [0055] In some embodiments, the water content of the aerosol is reduced as it is extracted through the aerosol cooling element.
    [0056] In one embodiment, a method of using an aerosol generating article comprising a plurality of elements assembled in the form of a rod is provided. The plurality of elements includes an aerosol-forming substrate and an aerosol-cooling element located downstream of the aerosol-forming substrate within the stem. The method comprises the steps of heating the aerosol-forming substrate to evolve an aerosol and inhale the aerosol. The aerosol is inhaled through the aerosol cooling element and is reduced in temperature before being inhaled.
    [0057] Features described in relation to one modality may also be applicable to other modalities.
    [0058] A specific modality will now be described with reference to the figures in which; Figure 1 is a schematic cross-sectional diagram of a first embodiment of an aerosol generating article; Figure 2 is a schematic cross-sectional diagram of a second embodiment of an aerosol generating article; Figure 3 is a graph illustrating the main blow-by-blow smoke temperature for two different aerosol generating articles; Figure 4 is a graph comparing intra-blowing temperature profiles for two different aerosol generation articles; Figure 5 is a graph illustrating main blow-by-blow smoke temperature for two different aerosol generating articles; Figure 6 is a graph illustrating main blow-by-blow nicotine levels for two different aerosol generating articles; Figure 7 is a graph illustrating main blow-by-blow glycerin levels for two different aerosol generating articles; Figure 8 is a graph illustrating main blow-by-blow nicotine levels for two different aerosol generating articles; Figure 9 is a graph illustrating main blow-by-blow glycerin levels for two different aerosol generating articles; Figure 10 is a graph comparing main nicotine levels between an aerosol-generating article and a reference cigarette; Figures 11A, 11B and 11C illustrate dimensions of a blade crimped material and a rod that can be used to calculate the longitudinal porosity of the aerosol cooling element.
    [0059] Figure 1 illustrates an aerosol generation article 10 according to an embodiment. The aerosol generating article 10 comprises four elements, an aerosol forming substrate 20, a hollow cellulose acetate tube 30, an aerosol cooling element 40 and a nozzle filter 50. These four elements are arranged sequentially and in alignment and are assembled by cigarette paper 60 to form a stem 11. The stem 11 has a mouth end 12 that a user inserts into the mouth of the stem during use and a distal end 13 located at the opposite end of the stem 11 to the end of mouth 12. Elements located between mouth end 12 and distal end 13 can be described as upstream of mouth end 12 or, alternatively, downstream of distal end 13.
    [0060] When assembled, the stem 11 is about 45 millimeters long and has an outside diameter of about 7.2 millimeters and an internal diameter of about 6.9 millimeters.
    [0061] The aerosol forming substrate 20 is located upstream of the hollow tube 30 and extends to the distal end 13 of the rod 11. In one embodiment, the aerosol forming substrate 20 comprises a crimped mold sheet tobacco package tobacco wrapped in filter paper (not shown) to form a plug. Mold leaf tobacco includes additives that include glycerin as an aerosol forming additive.
    [0062] The hollow acetate tube 30 is located immediately downstream of the aerosol forming substrate 20 and is formed by cellulose acetate. A function of the tube 30 is to locate the aerosol forming substrate 20 towards the distal end 13 of the stem 11 so that it can be brought into contact with a heating element. Tube 30 acts to prevent the aerosol forming substrate 20 from being forced along the shaft 11 towards the aerosol cooling element 40 when a heating element is inserted into the aerosol forming substrate 20. Tube 30 also acts as a spacer element to space the aerosol cooling element 40 from the aerosol forming substrate 20.
    [0063] The aerosol cooling element 40 has a length of about 18 mm, an outer diameter of about 7.12 mm and an inner diameter of about 6.9 mm. In one embodiment, the aerosol cooling element 40 is formed of a polylactic acid blade that is 50 mm ± 2 mm thick. The polylactic acid blade has been crimped and joined to define a plurality of channels that extend along the length of the aerosol cooling element 40. The total surface area of the aerosol cooling element is between 8,000 mm2 and 9,000 mm2 which is equivalent to approximately 500 mm2 per mm of length of the aerosol cooling element 40. The specific surface area of the aerosol cooling element 40 is approximately 2.5 mm2 / mg and it has a porosity between 60% and 90% in the longitudinal direction. Polylactic acid is maintained at a temperature of 160 degrees Celsius or less during use.
    [0064] Porosity is defined in this document as a measure of unfilled space on a rod that includes an aerosol cooling element consistent with that discussed in this document. For example, if a diameter of stem 11 was 50% not filled by element 40, the porosity would be 50%. Similarly, a rod would have 100% porosity if the internal diameter was completely unfilled and 0% porosity if it was completely filled. Porosity can be calculated using known methods.
    [0065] An exemplary illustration of how porosity is calculated is provided here and illustrated in Figures 11 A, 11B and 11C. When the aerosol cooling element 40 is formed of a blade of material 1110 that has a thickness (t) and a width (w), the cross-sectional area shown by an edge 1100 of the blade material 1110 is given by the multiplied width by the thickness. In a specific embodiment of a blade material that has a thickness of 50 micrometers (± 2 micrometers) and a width of 230 millimeters, the cross-sectional area is approximately 1.15 x 10-5 m2 (this can be denoted as the first area). An exemplified crimped material is illustrated in Figure 11 with the labeled thickness and width. An example rod 1200 is also shown to have a diameter (d). The interior area 1210 of the stem is given by the formula (d / 2) 2π. Assuming that an internal diameter of the stem that will eventually cover the material is 6.9 mm, the area of unfilled space can be calculated as approximately 3.74 x 10-5 m2 (this can be denoted as the second area).
    [0066] The crimped or non-crimped material comprising the aerosol cooling element 40 is then joined or folded and confined within the internal diameter of the rod (figure 11B). The ratio of the first and second areas based on the examples above is approximately 0.308. This ratio is multiplied by 100 and the quotient is subtracted from 100% to arrive at the porosity which is approximately 69% for the specific figures given here. Clearly, the thickness and width of a blade material can be varied. Similarly, the internal diameter of a rod can be varied.
    [0067] It will now be evident to a person skilled in the art that, with a known thickness and width of a material, in addition to the internal diameter of the rod, the porosity can be calculated as above. Consequently, where a sheet of material has a known thickness and length and is crimped and joined along the length, the space filled by the material can be determined. The unfilled space can be calculated, for example, by taking the internal diameter of the stem. The porosity or the unfilled space within the stem can then be calculated as a percentage of the total area of space within the stem from these calculations.
    [0068] The crimped and joined polylactic acid blade is packed inside a filter paper 41 to form the aerosol cooling element 40.
    [0069] The nozzle filter 50 is a conventional nozzle filter formed from cellulose acetate and has a length of about 45 millimeters.
    [0070] The four elements identified above are assembled because they are tightly wrapped within a paper 60. The paper 60 in this specific modality is a conventional cigarette paper that has standardized properties. The interference between the paper 60 and each of the elements locates the elements and defines the stem 11 of the aerosol generating article 10.
    [0071] Although the specific modality described above and illustrated in Figure 1 has four elements mounted on a cigarette paper, it is clear that an aerosol generating article may have additional elements or less elements.
    [0072] An aerosol generating article as shown in Figure 1 is designed to engage an aerosol generating device (not shown) to be consumed. Such an aerosol generating device includes means for heating the aerosol forming substrate 20 to a temperature sufficient to form an aerosol. Typically, the aerosol generating device may comprise a heating element surrounding the aerosol generating article adjacent the aerosol forming substrate 20 or a heating element that is inserted into the aerosol forming substrate 20.
    [0073] Once attached to an aerosol generating device, a user extracts at the mouth end 12 of the aerosol generating article 10 and the aerosol forming substrate 20 is heated to a temperature of about 375 degrees Celsius. At this temperature, volatile compositions are evolved from the aerosol forming substrate 20. These compositions condense to form an aerosol that is extracted through the rod 11 towards the user's mouth.
    [0074] The aerosol is extracted through the aerosol cooling element 40. As the aerosol passes through the aerosol cooling element 40, the temperature of the aerosol is reduced due to the transfer of thermal energy to the aerosol cooling element 40. In addition, water droplets condense from the aerosol and adsorb to internal surfaces of the channels that extend longitudinally defined through the aerosol cooling element 40.
    [0075] When the aerosol enters the aerosol cooling element 40, its temperature is about 60 degrees Celsius. Due to the cooling inside the aerosol cooling element 40, the temperature of the aerosol as it exits the aerosol cooling element 40 is about 40 degrees Celsius. In addition, the water content of the aerosol is reduced. Depending on the type of material that forms the aerosol cooling element 40, the water content of the aerosol can be reduced by any value between 0 and 90%. For example, when an element 40 is comprised of polylactic acid, the water content is not reduced considerably, that is, the reduction will be approximately 0%. In contrast, when starch-based material, such as Mater-Bi, is used to form an element 40, the reduction can be approximately 40%. It will be apparent to a person skilled in the art that by selecting the material comprising an element 40, the water content in the aerosol can be chosen.
    [0076] The aerosol formed by heating an aerosol-based substrate will normally comprise phenolic compositions. The use of an aerosol cooling element consistent with the modalities discussed in this document can reduce levels of phenol and cresols by 90% to 95%.
    [0077] Figure 2 illustrates a second embodiment of an aerosol generating article. Although the article in figure 1 is intended to be consumed in conjunction with an aerosol generating device, the article in figure 2 comprises a combustible heat source 80 that can be ignited and transfer heat to the aerosol forming substrate 20 to form a inhalable aerosol. The fuel heat source 80 is a charcoal element that is mounted close to the aerosol forming substrate at a distal end 13 of the stem 11.0 Article 10 of Figure 2 is configured to allow air to flow through the stem 11 and circulate through the substrate aerosol forming system 20 before being inhaled by a user. The elements that are essentially the same as the elements in Figure 1 have been given the same numbering.
    [0078] The exemplary modalities described above are not limiting. In view of the exemplifying modalities discussed above, other modalities consistent with the exemplifying modalities above will now be perceived by one skilled in the art.
    [0079] The following examples record experimental results obtained during tests made in the specific mode of an aerosol generating article that comprises an aerosol cooling element. Conditions for smoke and smoke machine specifications are presented in the ISO 3308 Standard (ISO 3308: 2000). The atmosphere for conditioning and testing is presented in the ISO 3402 Standard. Phenols were captured using Cambridge filter blocks. A quantitative measurement of phenolics, catechol, hydroquinone, phenol, o-, m- and p-cresol was performed by LC fluorescence.
    [0080] EXAMPLE 1 This experiment was carried out to evaluate the effect of incorporating a polylactic acid (PLA) aerosol cooling element crimped and joined in an aerosol generating article for use with an electrically heated aerosol generating device . The experiment investigated the effect of the aerosol cooling element on the blow-by-blow main aerosol temperature. A comparative study with a reference aerosol generation article without an aerosol cooling element is provided.
    [0081] Materials and methods. Aerosol-generating tests were performed under a Health Canada Smoke Regimen: 15 breaths were performed, each 55 ml in volume and 2 seconds of breath duration and which has a 30 second breath interval. 5 empty blows were made before and after a test.
    [0082] A preheating time was 30 s. During the experiment, laboratory conditions were (60 ± 4)% relative humidity (RH) and a temperature of (22 ± 1) ° C.
    [0083] An article A is an aerosol generating article that has a PLA aerosol cooling element. An article B is a reference aerosol generation article without an aerosol cooling element.
    [0084] The aerosol cooling element is made of a 30 pm thick blade from EarthFirst®PLA Blown Clear Packaging Film made from renewable plant resources and marketed under the trade name Ingeo ™ (Sidaplax, Belgium). For main aerosol temperature measurement, 5 replicates per sample were measured.
    [0085] Results. The average main aerosol temperature per blow made of Article A and Article B is shown in Figure 3. The main intra-blow temperature profile of blow number 1 of Article A and Article B is shown in Figure 4.
    [0086] EXAMPLE 2 This experiment was carried out to evaluate the effect of incorporating a copolymer aerosol cooling element based on crimped starch and joined in an aerosol generating article for use with an electrically heated aerosol generating device . The experiment investigated the effect of the aerosol cooling element on the blow-by-blow main aerosol temperature. A comparative study with a reference aerosol generation article without an aerosol cooling element is provided.
    [0087] Materials and methods. Aerosol-generating tests were performed under a Health Canada Smoke Regimen: 15 breaths were performed, each 55 ml in volume and 2 seconds of breath duration and which has a 30 second breath interval. 5 empty blows were made before and after a test.
    [0088] The preheating time was 30 s. During the experiment, laboratory conditions were (60 ± 4)% relative humidity (RH) and a temperature of (22 ± 1) ° C.
    [0089] Article C is an aerosol generating article that has a starch based copolymer aerosol cooling element. Article D is a reference aerosol generation article without an aerosol cooling element.
    [0090] The aerosol cooling element is 25mm long and made of a starch-based copolyester composition. For main aerosol temperature measurement, 5 replicates per sample were measured.
    [0091] Results. The average main aerosol temperature per blow and its standard deviation for both systems (ie Articles C and D) is shown in Figure 5.
    [0092] The blow-by-blow main aerosol temperature for the Article D reference system decreases almost linearly. The highest temperature was reached during blows 1 and 2 (about 57 to 58 ° C), while the lowest was measured at the end of the smoke test during blows 14 and 15 and are below 45 ° C. The use of an aerosol cooling element of copolyester composition based on crimped and joined starch significantly reduces the main aerosol temperature. The average aerosol temperature reduction shown in this specific example is about 18 ° C, with a maximum reduction of 23 ° C during puff number 1 and a minimum reduction of 14 ° C during puff number 3.
    [0093] EXAMPLE 3 In this example, the effect of a polylactic acid aerosol cooling element on blow-by-blow main nicotine and glycerin levels was investigated.
    [0094] Materials and methods. Blow-by-blow nicotine and glycerin deliveries were measured by gas chromatography / time-of-flight mass spectrometry (GC / MS-TOF). Tests were performed as described in example 1. Articles A and B are articles as described in example 1.
    [0095] Results. Blow-by-blow release profiles of nicotine and glycerin from Article A and Article B are shown in Figures 6 and 7.
    [0096] EXAMPLE 4- In this example, the effect of a starch-based copolyester aerosol cooling element on the nicotine and main aerosol glycerin levels was investigated.
    [0097] Materials and methods. Blow-by-blow nicotine and glycerin deliveries are measured by GC / MS-TOF. Tests were performed as described in example 2. Articles C and D are articles as described in example 1. Articles A and B are articles as described in example 1.
    [0098] Blow-by-blow nicotine and glycerin deliveries are shown in Figures 8 and 9. The total nicotine yields with a copolyester composition based on a starch crimp filter were 0.83 mg / cigarette (o = 0.11 mg ) and 1.04 mg / cigarette (o = 0.16 mg). The reduction in nicotine yields is clearly visible in Figure 8 and occurs mainly between blows 3 and 8. The use of an aerosol cooling element of starch-based copolyester composition reduced the variability in blow-by-blow nicotine yields ( cv = 38% with crimp filter, cv = 52% without filter). The maximum nicotine yield per single blow is 80 pg with the aerosol cooling element and up to 120 pg without.
    [0099] EXAMPLE 5- In this example, the effect of a polylactic acid aerosol cooling element on the total main aerosol phenol yield was investigated. In addition, the effect of a polylactic acid aerosol cooling element on the main aerosol phenol yields compared to an international reference cigarette 3R4F on a nicotine basis is provided.
    [00100] Materials and methods. Phenol analysis was performed. The number of replicates per prototype was 4. Laboratory conditions and test regime were as described in example 1. Articles A and B are as described in example 1. Main aerosol phenol yields for systems with and without the cooling element aerosol sprays are shown in Table 1. For comparison purposes, main smoke values for the Kentucky 3R4F reference cigarette are also given in Table 1. The Kentucky 3R4F reference cigarette is a commercially available reference cigarette, for example, together with to the College of Agriculture, Tobacco Research & Development center at the University of Kentucky. TABLE 1. INCOME OF MAIN PHENOLS FOR ARTICLE B, ARTICLE A, AND REFERENCE CIGARETTE 3R4F. INCOME IS GIVEN IN MG / CIGARETTE.

    [00101] The most dramatic effect of adding a PLA aerosol cooling element in this specific example is observed for phenol where the reduction in phenol is greater than 92% against the reference system without an aerosol cooling element and 95% against the reference cigarette 3R4F (expressed on a per mg nicotine basis). The percentages of phenol yield reduction (on a nicotine basis) are given in Table 2 expressed per mg of nicotine. TABLE 2. PHENOL INCOME REDUCTION (BASED ON NICOTINE) EXPRESSED IN%.

    [00102] The variation of the phenol yields in the smoke against 3R4F (based on nicotine) as a function of the main smoke deliveries is given in Figure 10.
    [00103] EXAMPLE 6 In this example, the effect of a polylactic acid aerosol cooling element on the main blow-by-blow smoke phenol yield was investigated.
    [00104] Materials and methods. An analysis of phenols was performed. The number of replicates per prototype was 4. The conditions were as described in example 1. Articles A and B are as described in example 1.
    [00105] Results. Blow-by-blow profiles of phenol and nicotine for Articles A and B are given in Figures 8 and 9. For the Article B system, a main aerosol phenol was detected from the blow number 3 and reached a maximum from the blow number 7. The effect of the PLA aerosol cooling element on blow-by-blow phenol deliveries is clearly visible, since phenol deliveries are below the detection limit (LOD). A reduction in the total nicotine yield and a leveling in the blow-by-blow nicotine release profile was seen in Figure 9.
    权利要求:
    Claims (6)
    [0001]
    1. A heated aerosol generating article (10), comprising a plurality of elements assembled in the form of a rod (11), the plurality of elements including an aerosol forming substrate (20), a cooling element of aerosol (40) located downstream of the aerosol forming substrate (20) inside the rod (11) and a filter located downstream of the aerosol cooling element (40) inside the rod (11), the aerosol cooling element (40) being formed from a crimped sheet comprising a plurality of channels that extend longitudinally, characterized by the fact that the aerosol cooling element (40) is formed from a crimped and joined polymeric sheet so that the aerosol cooling element comprises a plurality of channels that extend longitudinally and have a porosity between 50% and 90% in the longitudinal direction, the longitudinal porosity being derived from a ratio of the section area t cross section of the material forming the aerosol cooling element and an internal cross-sectional area of the aerosol generating article in the portion containing the aerosol cooling element.
    [0002]
    2. Heated aerosol generating article (10) according to claim 1, characterized by the fact that the aerosol cooling element (40) has a total surface area between 300 mm2 per mm in length of the cooling element aerosol and 1,000 mm2 per mm of length of the aerosol cooling element.
    [0003]
    Heated aerosol generating article (10) according to any one of the preceding claims, characterized by the fact that the aerosol cooling element (40) comprises a polymeric blade material selected from the group consisting of polyethylene , polypropylene, polyvinyl chloride, polyethylene terephthalate, polylactic acid and cellulose acetate.
    [0004]
    4. A heated aerosol generating article (10) according to any one of the preceding claims, characterized by the fact that the aerosol cooling element (40) is between 7 mm and 28 mm in length.
    [0005]
    5. Heated aerosol generating article (10) according to any of the preceding claims, characterized by the fact that the aerosol cooling element (40) comprises a material that undergoes a phase transition when an aerosol evolved from the aerosol forming substrate (40) is extracted through the aerosol cooling element (40).
    [0006]
    6. Heated aerosol generating article (10) according to any one of the preceding claims, characterized in that it comprises a spacer element (30) located between the aerosol forming substrate (20) and the aerosol cooling element (40) inside the rod (11).
    类似技术:
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    BR112014019942B1|2020-11-10|aerosol generating article that has an aerosol cooling element
    BR112014020010B1|2020-12-01|aerosol generator article
    DK2863765T3|2017-05-08|Smoking article for use with an internal heating element.
    CN104010531B|2019-06-04|The aerosol generating article being used together with aerosol generating device
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    同族专利:
    公开号 | 公开日
    CN107981417B|2021-09-24|
    US11140916B2|2021-10-12|
    CN108030151A|2018-05-15|
    CN104203015B|2018-01-19|
    IL234045D0|2014-09-30|
    TWI616144B|2018-03-01|
    CN104203015A|2014-12-10|
    PH12014501809B1|2014-11-24|
    CN108030151B|2021-12-21|
    TW201345447A|2013-11-16|
    PL2814342T3|2016-09-30|
    WO2013120565A2|2013-08-22|
    WO2013120565A3|2014-03-20|
    CA2864238A1|2013-08-22|
    HUE028558T2|2016-12-28|
    MX368241B|2019-09-25|
    ZA201405902B|2015-11-25|
    UA115049C2|2017-09-11|
    CN107981417A|2018-05-04|
    MX2014009773A|2015-02-20|
    JP2015508676A|2015-03-23|
    IN2014DN06886A|2015-05-15|
    RS54626B1|2016-08-31|
    ES2573814T3|2016-06-10|
    DK2814342T3|2016-04-11|
    KR101616664B1|2016-04-28|
    SG11201404855PA|2014-10-30|
    RU2014137106A|2016-04-10|
    MY167636A|2018-09-21|
    TWI670018B|2019-09-01|
    PH12014501809A1|2014-11-24|
    EP2814342B1|2016-03-09|
    AU2012370060A1|2014-09-18|
    US20150027474A1|2015-01-29|
    EP2625975A1|2013-08-14|
    NZ628456A|2016-06-24|
    KR20140135173A|2014-11-25|
    RU2609394C2|2017-02-01|
    CN108143002A|2018-06-12|
    TW201826949A|2018-08-01|
    EP2814342A2|2014-12-24|
    IL234045A|2020-05-31|
    CA2864238C|2019-07-09|
    JP5877618B2|2016-03-08|
    HK1250891A1|2019-01-18|
    HK1200288A1|2015-08-07|
    AU2012370060B2|2017-04-13|
    AR089503A1|2014-08-27|
    US20180235283A1|2018-08-23|
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    法律状态:
    2018-12-04| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-12-10| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-06-23| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2020-11-10| 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 28/12/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    EP12155248.3|2012-02-13|
    EP12155248.3A|EP2625975A1|2012-02-13|2012-02-13|Aerosol-generating article having an aerosol-cooling element|
    PCT/EP2012/077086|WO2013120565A2|2012-02-13|2012-12-28|Aerosol-generating article having an aerosol-cooling element|
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