Article for use in an aerosol provision system
An article for use as or as part of a non-combustible aerosol provision system includes an aerosol generating material including at least one aerosol forming material and a hollow tubular body disposed downstream of the aerosol generating material, the hollow tubular body having a wall thickness greater than about 0.5 mm and a density of between about 0.25 and about 0.75 g/cc. At least one ventilation area is arranged to provide external air into the hollow tubular body. A system is also described, including an article and a non-combustible aerosol provision device, as well as a method of forming an article.
The present application is a National Phase entry of PCT Application No. PCT/GB2020/053334, filed Dec. 21, 2020, which claims priority from GB Patent Application No. 1919064.4 (filed Dec. 20, 2019) and GB Patent Application No. 2019581. (filed Dec. 11, 2020), each of which is hereby fully incorporated herein by reference.
TECHNICAL FIELDThe following relates to an article for use in or as part of a non-combustible aerosol provision system, a non-combustible aerosol provision system including an article and a method of manufacturing an article.
BACKGROUNDCertain tobacco industry products produce an aerosol during use, which is inhaled by a user. For example, tobacco heating devices heat an aerosol generating substrate such as tobacco to form an aerosol by heating, but not burning, the substrate. Such tobacco industry products commonly include mouthpieces through which the aerosol passes to reach the user's mouth.
SUMMARYIn some embodiments described herein, in a first aspect there is an article for use as or as part of a non-combustible aerosol provision system, the article comprising: an aerosol generating material comprising at least one aerosol forming material; and a hollow tubular body disposed downstream of the aerosol generating material, the hollow tubular body comprising a wall thickness greater than about 0.5 mm and a density of between about 0.25 and about 0.75 g/cc, wherein at least one ventilation area is arranged to provide external air into the hollow tubular body. In some embodiments described herein, in a second aspect there is provided a system comprising: a non-combustible aerosol provision device comprising a heater; and an article according to the first aspect above. In some embodiments described herein, in a third aspect there is provided a method of manufacturing an article for use with a non-combustible aerosol provision device, the method comprising: providing an aerosol generating material comprising at least one aerosol forming material; and disposing a tubular body downstream of the aerosol generating material, the tubular body having a wall thickness greater than about 0.5 mm and a density of between about 0.25 and about 0.75 g/cc, and providing a ventilation area arranged to provide external air into the hollow tubular body.
Embodiments will now be described, by way of example only, with reference to the accompanying drawings, in which:
As used herein, the term “delivery system” is intended to encompass systems that deliver at least one substance to a user, and includes: combustible aerosol provision systems, such as cigarettes, cigarillos, cigars, and tobacco for pipes or for roll-your-own or for make-your-own cigarettes (whether based on tobacco, tobacco derivatives, expanded tobacco, reconstituted tobacco, tobacco substitutes or other smokable material); non-combustible aerosol provision systems that release compounds from an aerosol-generating material without combusting the aerosol-generating material, such as electronic cigarettes, tobacco heating products, and hybrid systems to generate aerosol using a combination of aerosol-generating materials; and aerosol-free delivery systems that deliver the at least one substance to a user orally, nasally, transdermally or in another way without forming an aerosol, including but not limited to, lozenges, gums, patches, articles comprising inhalable powders, and oral products such as oral tobacco which includes snus or moist snuff, wherein the at least one substance may or may not comprise nicotine. According to the present disclosure, a “combustible” aerosol provision system is one where a constituent aerosol-generating material of the aerosol provision system (or component thereof) is combusted or burned during use in order to facilitate delivery of at least one substance to a user. According to the present disclosure, a “non-combustible” aerosol provision system is one where a constituent aerosol-generating material of the aerosol provision system (or component thereof) is not combusted or burned in order to facilitate delivery of at least one substance to a user. In embodiments described herein, the delivery system is a non-combustible aerosol provision system, such as a powered non-combustible aerosol provision system.
In some embodiments, the non-combustible aerosol provision system is an electronic cigarette, also known as a vaping device or electronic nicotine delivery system (END), although it is noted that the presence of nicotine in the aerosol-generating material is not a requirement. In some embodiments, the non-combustible aerosol provision system is an aerosol generating material heating system, also known as a heat-not-burn system. An example of such a system is a tobacco heating system.
In one embodiment, the non-combustible aerosol provision system is a hybrid system to generate aerosol using a combination of aerosolizable materials, one or a plurality of which may be heated. Each of the aerosolizable materials may be, for example, in the form of a solid, liquid or gel and may or may not contain nicotine. In one embodiment, the hybrid system comprises a liquid or gel aerosolizable material and a solid aerosolizable material. The solid aerosolizable material may comprise, for example, tobacco or a non-tobacco product.
Typically, the non-combustible aerosol provision system may comprise a non-combustible aerosol provision device and a consumable for use with the non-combustible aerosol provision device.
In some embodiments, the disclosure relates to consumables comprising aerosol generating material and configured to be used with non-combustible aerosol provision devices. These consumables are sometimes referred to as articles throughout the disclosure. The aerosol-generating material, also referred to as aerosol generating material, can be tobacco material as described herein.
A consumable is an article comprising or consisting of aerosol-generating material, part or all of which is intended to be consumed during use by a user. A consumable may comprise one or more other components, such as an aerosol-generating material storage area, an aerosol-generating material transfer component, an aerosol generation area, a housing, a wrapper, a mouthpiece, a filter and/or an aerosol-modifying agent. A consumable may also comprise an aerosol generator, such as a heater, that emits heat to cause the aerosol-generating material to generate aerosol in use. The heater may, for example, comprise combustible material, a material heatable by electrical conduction, or a susceptor.
In some embodiments, the non-combustible aerosol provision system, such as a non-combustible aerosol provision device thereof, may comprise a power source and a controller. The power source may, for example, be an electric power source or an exothermic power source. In some embodiments, the exothermic power source comprises a carbon substrate which may be energized so as to distribute power in the form of heat to an aerosol-generating material or to a heat transfer material in proximity to the exothermic power source.
In some embodiments, the non-combustible aerosol provision system may comprise an area for receiving the consumable, an aerosol generator, an aerosol generation area, a housing, a mouthpiece, a filter and/or an aerosol-modifying agent. In some embodiments, the consumable for use with the non-combustible aerosol provision device may comprise aerosol-generating material, an aerosol-generating material storage area, an aerosol-generating material transfer component, an aerosol generator, an aerosol generation area, a housing, a wrapper, a filter, a mouthpiece, and/or an aerosol-modifying agent.
In some embodiments, the substance to be delivered may be an aerosol-generating material or a material that is not intended to be aerosolized. As appropriate, either material may comprise one or more active constituents, one or more flavors, one or more aerosol-former materials, and/or one or more other functional materials.
An aerosol generator is an apparatus configured to cause aerosol to be generated from the aerosol-generating material. In some embodiments, the aerosol generator is a heater configured to subject the aerosol-generating material to heat energy, so as to release one or more volatiles from the aerosol-generating material to form an aerosol. In some embodiments, the aerosol generator is configured to cause an aerosol to be generated from the aerosol-generating material without heating. For example, the aerosol generator maybe configured to subject the aerosol-generating material to one or more of vibration, increased pressure, or electrostatic energy. Aerosol-generating material is a material that is capable of generating aerosol, for example when heated, irradiated or energized in any other way. Aerosol-generating material may, for example, be in the form of a solid, liquid or gel which may or may not contain an active substance and/or flavorants. In some embodiments, the aerosol generating material may comprise an “amorphous solid”, which may alternatively be referred to as a “monolithic solid” (i.e. non-fibrous). In some embodiments, the amorphous solid may be a dried gel. The amorphous solid is a solid material that may retain some fluid, such as liquid, within it. In some embodiments, the aerosol generating material may for example comprise from about 50 wt %, 60 wt % or 70 wt % of amorphous solid, to about 90 wt %, 95 wt % or 100 wt % of amorphous solid. The aerosol-generating material may comprise one or more active substances and/or flavors, one or more aerosol-former materials, and optionally one or more other functional material.
The aerosol-former material may comprise one or more constituents capable of forming an aerosol. In some embodiments, the aerosol-former material may comprise one or more of glycerine, glycerol, propylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, 1,3-butylene glycol, erythritol, meso-Erythritol, ethyl vanillate, ethyl laurate, a diethyl suberate, triethyl citrate, triacetin, a diacetin mixture, benzyl benzoate, benzyl phenyl acetate, tributyrin, lauryl acetate, lauric acid, myristic acid, and propylene carbonate.
The one or more other functional materials may comprise one or more of pH regulators, coloring agents, preservatives, binders, fillers, stabilizers, and/or antioxidants.
The material may be present on or in a support, to form a substrate. The support may, for example, be or comprise paper, card, paperboard, cardboard, reconstituted material, a plastics material, a ceramic material, a composite material, glass, a metal, or a metal alloy. In some embodiments, the support comprises a susceptor. In some embodiments, the susceptor is embedded within the material. In some alternative embodiments, the susceptor is on one or either side of the material.
An aerosol-modifying agent is a substance, typically located downstream of the aerosol generation area, that is configured to modify the aerosol generated, for example by changing the taste, flavor, acidity or another characteristic of the aerosol. The aerosol modifying agent may be provided in an aerosol-modifying agent release component, that is operable to selectively release the aerosol-modifying agent.
The aerosol-modifying agent may, for example, be an additive or a sorbent. The aerosol-modifying agent may, for example, comprise one or more of a flavorant, a colorant, water, and a carbon adsorbent. The aerosol-modifying agent may, for example, be a solid, a liquid, or a gel. The aerosol-modifying agent maybe in powder, thread or granule form. The aerosol-modifying agent may be free from filtration material. A susceptor is a material that is heatable by penetration with a varying magnetic field, such as an alternating magnetic field. The susceptor may be an electrically-conductive material, so that penetration thereof with a varying magnetic field causes induction heating of the heating material. The heating material may be magnetic material, so that penetration thereof with a varying magnetic field causes magnetic hysteresis heating of the heating material. The susceptor may be both electrically-conductive and magnetic, so that the susceptor is heatable by both heating mechanisms. The device that is configured to generate the varying magnetic field is referred to as a magnetic field generator, herein induction heating is a process in which an electrically-conductive object is heated by penetrating the object with a varying magnetic field. The process is described by Faraday's law of induction and Ohm's law. An induction heater may comprise an electromagnet and a device for passing a varying electrical current, such as an alternating current, through the electromagnet. When the electromagnet and the object to be heated are suitably relatively positioned so that the resultant varying magnetic field produced by the electromagnet penetrates the object, one or more eddy currents are generated inside the object. The object has a resistance to the flow of electrical currents. Therefore, when such eddy currents are generated in the object, their flow against the electrical resistance of the object causes the object to be heated. This process is called Joule, ohmic, or resistive heating. An object that is capable of being inductively heated is known as a susceptor.
In one embodiment, the susceptor is in the form of a closed circuit. It has been found that, when the susceptor is in the form of a closed circuit, magnetic coupling between the susceptor and the electromagnet in use is enhanced, which results in greater or improved Joule heating.
Magnetic hysteresis heating is a process in which an object made of a magnetic material is heated by penetrating the object with a varying magnetic field. A magnetic material can be considered to comprise many atomic-scale magnets, or magnetic dipoles. When a magnetic field penetrates such material, the magnetic dipoles align with the magnetic field. Therefore, when a varying magnetic field, such as an alternating magnetic field, for example as produced by an electromagnet, penetrates the magnetic material, the orientation of the magnetic dipoles changes with the varying applied magnetic field. Such magnetic dipole reorientation causes heat to be generated in the magnetic material.
When an object is both electrically-conductive and magnetic, penetrating the object with a varying magnetic field can cause both Joule heating and magnetic hysteresis heating in the object. Moreover, the use of magnetic material can strengthen the magnetic field, which can intensify the Joule heating.
In each of the above processes, as heat is generated inside the object itself, rather than by an external heat source by heat conduction, a rapid temperature rise in the object and more uniform heat distribution can be achieved, particularly through selection of suitable object material and geometry, and suitable varying magnetic field magnitude and orientation relative to the object. Moreover, as induction heating and magnetic hysteresis heating do not require a physical connection to be provided between the source of the varying magnetic field and the object, design freedom and control over the heating profile may be greater, and cost may be lower.
Articles, for instance those in the shape of rods, are often named according to the product length: “regular” (typically in the range 68-75 mm, e.g. from about 68 mm to about 72 mm), “short” or “mini” (68 mm or less), “king-size” (typically in the range 75-91 mm, e.g. from about 79 mm to about 88 mm), “long” or “super-king” (typically in the range 91-105 mm, e.g. from about 94 mm to about 101 mm) and “ultra-long” (typically in the range from about 110 mm to about 121 mm).
They are also named according to the product circumference: “regular” (about 23-25 mm), “wide” (greater than 25 mm), “slim” (about 22-23 mm), “demi-slim” (about 19-22 mm), “super-slim” (about 16-19 mm), and “micro-slim” (less than about 16 mm).
Accordingly, an article in a king-size, super-slim format will, for example, have a length of about 83 mm and a circumference of about 17 mm. Each format may be produced with mouthpieces of different lengths. The mouthpiece length will be from about 30 mm to 50 mm. A tipping paper connects the mouthpiece to the aerosol generating material and will usually have a greater length than the mouthpiece, for example from 3 to 10 mm longer, such that the tipping paper covers the mouthpiece and overlaps the aerosol generating material, for instance in the form of a rod of substrate material, to connect the mouthpiece to the rod.
Articles and their aerosol generating materials and mouthpieces described herein can be made in, but are not limited to, any of the above formats.
The terms ‘upstream’ and ‘downstream’ used herein are relative terms defined in relation to the direction of mainstream aerosol drawn though an article or device in use.
The filamentary tow or filter material described herein can comprise cellulose acetate fiber tow. The filamentary tow can also be formed using other materials used to form fibers, such as polyvinyl alcohol (PVOH), polylactic acid (PLA), polycaprolactone (PCL), poly(i-4 butanediol succinate) (PBS), poly(butylene adipate-co-terephthalate)(PBAT), starch based materials, cotton, aliphatic polyester materials and polysaccharide polymers or a combination thereof. The filamentary tow may be plasticized with a suitable plasticizer for the tow, such as triacetin where the material is cellulose acetate tow, or the tow may be non-plasticized. The tow can have any suitable specification, such as fibers having a cross section which is ‘Y’ shaped, ‘X’ shaped or ‘O’ shaped. The fibers of the tow may have filamentary denier values between 2.5 and 15 denier per filament, for example between 8.0 and 11.0 denier per filament and total denier values of 5,000 to 50,000, for example between 10,000 and 40,000. When viewed in cross section, the fibers may have an isoperimetric ratio L2/A of 25 or less, preferably 20 or less, and more preferably 15 or less, where L is the length of the perimeter of the cross section and is the area of the cross section. Filter material described herein also includes cellulose-based materials such as paper. Such materials may have a relatively low density, such as between about 0.1 and about 0.45 grains per cubic centimeter, to allow air and/or aerosol to pass through the material. Although described as filter materials, such materials may have a primary purpose, such as increasing the resistance to draw of a component, that is not related to filtration as such.
As used herein, the term “tobacco material” refers to any material comprising tobacco or derivatives or substitutes thereof. The term “tobacco material” may include one or more of tobacco, tobacco derivatives, expanded tobacco, reconstituted tobacco or tobacco substitutes. The tobacco material may comprise one or more of ground tobacco, tobacco fiber, cut tobacco, extruded tobacco, tobacco stem, tobacco lamina, reconstituted tobacco and/or tobacco extract. In the tobacco material described herein, the tobacco material contains an aerosol forming material. In this context, an “aerosol forming material” is an agent that promotes the generation of an aerosol. An aerosol forming material may promote the generation of an aerosol by promoting an initial vaporisation and/or the condensation of a gas to an inhalable solid and/or liquid aerosol. In some embodiments, an aerosol forming material may improve the delivery of favor from the aerosol generating material. In general, any suitable aerosol forming material or agents may be included in the aerosol generating material of the invention, including those described herein. Other suitable aerosol forming materials include, but are not limited to: a polyol such as sorbitol, glycerol, and glycols like propylene glycol or triethylene glycol, a non-polyol such as monohydric alcohols, high boiling point hydrocarbons, acids such as lactic acid, glycerol derivatives, esters such as diacetin, triacetin, triethylene glycol diacetate, triethyl citrate or myristates including ethyl myristate and isopropyl myristate and aliphatic carboxylic acid esters such as methyl stearate, dimethyl dodecanedioate and dimethyl tetradecanedioate. In some embodiments, the aerosol forming material may be glycerol, propylene glycol, or a mixture of glycerol and propylene glycol. The total amount of glycerol, propylene glycol, or a mixture of glycerol and propylene glycol used maybe in the range of between 10% and 30%, for instance between 15% and 25% of the tobacco material measured on a dry weight basis. Glycerol maybe present in an amount of from 10 to 20% by weight of the tobacco material, for example 13 to 16% by weight of the composition, or about 14% or 15% by weight of the composition.
Propylene glycol, if present, may be present in an amount of from 0.1 to 0.3% by weight of the composition.
In some embodiments, the substance to be delivered comprises an active substance.
The active substance as used herein may be a physiologically active material, which is a material intended to achieve or enhance a physiological response. The active substance may for example be selected from nutraceuticals, nootropics, psychoactives. The active substance may be naturally occurring or synthetically obtained. The active substance may comprise for example nicotine, caffeine, taurine, theine, vitamins such as B6 or B12 or C, melatonin, cannabinoids, or constituents, derivatives, or combinations thereof. The active substance may comprise one or more constituents, derivatives or extracts of tobacco, Cannabis or another botanical.
In some embodiments, the active substance comprises nicotine. In some embodiments, the active substance comprises caffeine, melatonin or vitamin B12 As noted herein, the active substance may comprise or be derived from one or more botanicals or constituents, derivatives or extracts thereof. As used herein, the term “botanical” includes any material derived from plants including, but not limited to, extracts, leaves, bark, fibers, stems, roots, seeds, flowers, fruits, pollen, husk, shells or the like. Alternatively, the material may comprise an active compound naturally existing in a botanical, obtained synthetically. The material may be in the form of liquid, gas, solid, powder, dust, crushed particles, granules, pellets, shreds, strips, sheets, or the like Example botanicals are tobacco, Eucalyptus, star anise, hemp, cocoa, Cannabis, fennel, lemongrass, peppermint, spearmint, rooibos, chamomile, flax, ginger, Ginkgo biloba, hazel, hibiscus, laurel, licorice (liquorice), matcha, mate, orange skin, Papaya, rose, sage, tea such as green tea or black tea, thyme, clove, cinnamon, coffee, aniseed (anise), basil, bay leaves, cardamom, coriander, cumin, nutmeg, oregano, paprika, rosemary, saffron, lavender, lemon peel, mint, juniper, elderflower, vanilla, wintergreen, beefsteak plant, Curcuma, turmeric, sandalwood, cilantro, bergamot, orange blossom, myrtle, cassis, valerian, pimento, mace, damien, marjoram, olive, lemon balm, lemon basil, chive, Carvi, Verbena, tarragon, geranium, mulberry, Ginseng, theanine, theacrine, maca, ashwagandha, damiana, guarana, chlorophyll, baobab or any combination thereof. The mint maybe chosen from the following mint varieties Mentha ARVENTIS, Mentha c.v., Mentha niliaca, Mentha piperita, Mentha piperita citrata c.v., Mentha piperita c.v, Mentha spicata crispa, Mentha cardifolia, Mentha longifolia, Mentha suaveolens variegata, Mentha pulegium, Mentha spicata c.v. and Mentha suaveolens In some embodiments, the active substance comprises or is derived from one or more botanicals or constituents, derivatives or extracts thereof and the botanical is tobacco.
In some embodiments, the active substance comprises or is derived from one or more botanicals or constituents, derivatives or extracts thereof and the botanical is selected from Eucalyptus, star anise, cocoa and hemp. In some embodiments, the active substance comprises or derived from one or more botanicals or constituents, derivatives or extracts thereof and the botanical is selected from rooibos and fennel. In some embodiments, the substance to be delivered comprises a flavor.
As used herein, the terms “flavor” and “flavorant” refer to materials which, where local regulations permit, maybe used to create a desired taste, aroma or other somato-sensorial sensation in a product for adult consumers. They may include naturally occurring flavor materials, botanicals, extracts of botanicals, synthetically obtained materials, or combinations thereof (e.g., tobacco, Cannabis, licorice (liquorice), Hydrangea, eugenol, Japanese white bark magnolia leaf, chamomile, fenugreek, clove, maple, matcha, menthol, Japanese mint, aniseed (anise), cinnamon, turmeric, Indian spices, Asian spices, herb, wintergreen, cherry, berry, red berry, cranberry, peach, apple, orange, mango, clementine, lemon, lime, tropical fruit, Papaya, rhubarb, grape, durian, dragon fruit, cucumber, blueberry, mulberry, citrus fruits, Drambuie, bourbon, scotch, whiskey, gin, tequila, rum, spearmint, peppermint, lavender, aloe vera, cardamom, celery, cascarilla, nutmeg, sandalwood, bergamot, geranium, khat, naswar, betel, shisha, pine, honey essence, rose oil, vanilla, lemon oil, orange oil, orange blossom, cherry blossom, Cassia, caraway, cognac, jasmine, ylang-ylang, sage, fennel, wasabi, pimenm, ginger, coriander, coffee, hemp, a mint oil from any species of the genus Mentha, Eucalyptus, star anise, cocoa, lemongrass, rooibos, flax, Ginkgo biloba, hazel, hibiscus, laurel, mate, orange skin, rose, tea such as green tea or black tea, thyme, juniper, elderflower, basil, bay leaves, cumin, oregano, paprika, rosemary, saffron, lemon peel, mint, beefsteak plant, Curcuma, cilantro, myrtle, cassis, valerian, pimento, mace, damien, marjoram, olive, lemon balm, lemon basil, chive, Carvi, Verbena, tarragon, limonene, thymol, camphene), flavor enhancers, bitterness receptor site blockers, sensorial receptor site activators or stimulators, sugars and/or sugar substitutes (e.g., sucralose, acesulfame potassium, aspartame, saccharine, cyclamates, lactose, sucrose, glucose, fructose, sorbitol, or mannitol), and other additives such as charcoal, chlorophyll, minerals, botanicals, or breath freshening agents. They maybe imitation, synthetic or natural ingredients or blends thereof. They may be in any suitable form, for example, liquid such as an oil, solid such as a powder, or gas. In some embodiments, the flavor comprises menthol, spearmint and/or peppermint. In some embodiments, the flavor comprises flavor components of cucumber, blueberry, citrus fruits and/or redberry. In some embodiments, the flavor comprises eugenol. In some embodiments, the flavor comprises flavor components extracted from tobacco. In some embodiments, the flavor comprises flavor components extracted from Cannabis.
In some embodiments, the flavor may comprise a sensate, which is intended to achieve a somato-sensorial sensation which are usually chemically induced and perceived by the stimulation of the fifth cranial nerve (trigeminal nerve), in addition to or in place of aroma or taste nerves, and these may include agents providing heating, cooling, tingling, numbing effect. A suitable heat effect agent may be, but is not limited to, vanillyl ethyl ether and a suitable cooling agent may be, but not limited to eucolyptol, WS-3.
In the figures described herein, like reference numerals are used to illustrate equivalent features, articles or components.
The minimum distance d may be 3 mm upwards. Preferably 3 mm up to 10 mm and anything in between. Exemplified minimum distances d include 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm and 10 mm. In each embodiment, the article further comprises a wrapper 6 at least partially surrounding the aerosol generating material 2 and the first tubular body 3 to connect the aerosol generating material 2 to the first tubular body 3. In some embodiments the wrapper may extend along the full length of the article 1 to attach the mouth end section 20. In the present example, a further wrapper 6′ underlies the wrapper 6, and extends along the mouth end section 20. Further wrapper 6′ combines the second tubular body 5, the first tubular body 3, cylindrical body 21, and third tubular body 22, to form a wrapped mouth end section. In the present example, wrapper 6 extends partially along the length of the aerosol generating material 2 to attach the aerosol generating material to the wrapped mouth end section.
The wrapper 6 may be a paper material comprising a citrate, such as sodium nitrate or potassium nitrate. In such examples, the wrapper 6 may have a citrate content of 2% by weight or less, or 1% by weight or less. This reduces charring of the wrapper 6 when the article 1 is heated in the non-combustible aerosol provision device too.
The first tubular body 3 is configured to serve as a heat dissipater to reduce the phenomena of ‘hot puff. ‘Hot puff is defined as aerosol delivered to the user at an uncomfortably high temperature. Hot puff may be exacerbated when a user draws aerosol through a heated article 1 at a high rate, reducing the time for heat in the aerosol to be dissipated. When inserted into a non-combustible aerosol provision device too, the first tubular body 3 separates the mouth end section from the heater 101 to provide space for heat to dissipate before the aerosol reaches the mouth end section 20. Further, it shall be appreciated that heat will be conducted away from the aerosol and into the first tubular body 3 as the aerosol is drawn therethrough. In this way, the first tubular body 3 acts as a heat sink. In the present example, hollow tubular body 3 is formed from filamentary tow. In other embodiments, other constructions may be used, such as spirally wound layers of paper, cardboard tubes, tubes formed using a papier-mache type process, molded or extruded plastic tubes or similar.
The first tubular body 3 preferably has a wall thickness of at least about 325 pm and up to about 2 mm, preferably between 500 pm and 1.5 mm and more preferably between 750 pm and 1 mm. In the present example, the first tubular body 3 has a wall thickness of about 1 mm. The “wall thickness” of the first tubular body 3 corresponds to the thickness of the wall of the first tubular body 3 in a radial direction. This may be measured, for example, using a caliper. The use of filamentary tow and/or wall thicknesses in these ranges have advantage of insulating the hot aerosol passing through the second cavity 3a from the outer surface of the first tubular body 3.
The wall thickness together with the external diameter of the first tubular body 3 together define the internal diameter or cavity size of the first tubular body 3.
In some embodiments, the thickness of the wall of the first tubular body 3 is at least 325 microns and, preferably, at least 400, 500, 600, 700, 800, 900 or 1000 microns. In some embodiments, the thickness of the wall of the first tubular body 3 is at least 1250 or 1500 microns.
In some embodiments, the thickness of the wall of the first tubular body 3 is less than 2000 microns and, preferably, less than 1500 microns.
The increased thickness of the wall of the first tubular body 3 means that it has a greater thermal mass, which has been found to help reduce the temperature of the aerosol passing through the first tubular body 3 and reduce the surface temperature of the mouth end section 20 at locations downstream of the first tubular body 3. This is thought to be because the greater thermal mass of the first tubular body 3 allows the first tubular body 3 to absorb more heat from the aerosol in comparison to a first tubular body 3 with a thinner wall thickness. The increased thickness of the first tubular body 3 also channels the aerosol centrally into the mouth end section 20 such that less heat from the aerosol is transferred to the outer portions of the mouth end section 20.
Preferably, the density of the first tubular body 3 is at least about 0.25 grams per cubic centimeter (g/cc), more preferably at least about 0.3 g/cc. Preferably, the density of the first tubular body 3 is less than about 0.75 grams per cubic centimeter (g/cc), more preferably less than 0.6 g/cc. In some embodiments, the density of the first tubular body 3 is between 0.25 and 0.75 g/cc, more preferably between 0.3 and 0.6 g/cc, and more preferably between 0.4 g/cc and 0.6 g/cc or about 0.5 g/cc. These densities have been found to provide a good balance between improved firmness afforded by denser material and the lower heat transfer properties of lower density material. For the purposes of the present example, the “density” of the first tubular body 3 refers to the density of the filamentary tow forming the element with any plasticizer incorporated. The density may be determined by dividing the total weight of the material forming the first tubular body 3 by the total volume of the material forming the first tubular body 3, wherein the total volume can be calculated using appropriate measurements of the material forming the first tubular body 3 taken, for example, using callipers. Where necessary, the appropriate dimensions maybe measured using a microscope. The filamentary tow forming the first tubular body 3 preferably has a total denier of less than 45,000, more preferably less than 42,000. This total denier has been found to allow the formation of a tubular element 13 which is not too dense. Preferably, the total denier is at least 20,000, more preferably at least 25,000. In preferred embodiments, the filamentary tow forming the first tubular body 3 has a total denier between 25,000 and 45,000, more preferably between 35,000 and 45,000. Preferably the cross-sectional shape of the filaments of tow are ‘Y’ shaped, although in other embodiments other shapes such as ‘X’ shaped filaments can be used.
The filamentary tow forming the first tubular body 3 preferably has a denier per filament of greater than 3. This denier per filament has been found to allow the formation of a tubular element 13 which is not too dense. Preferably, the denier per filament is at least 4, more preferably at least 5. In preferred embodiments, the filamentary tow forming the first tubular body 3 has a denier per filament between 4 and 10, more preferably between 4 and 9 In one example, the filamentary tow forming the first tubular body 3 has an 8Y40,ooo tow formed from cellulose acetate and comprising 18% plasticizer, for instance triacetin. The first tubular body 3 preferably comprises from 10% to 22% by weight of plasticizer. For cellulose acetate tow, the plasticizer is preferably triacetin, although other plasticizers such as polyethelyne glycol (PEG) can be used. The first tubular body 3 can comprise less than about 18% by weight of plasticizer, such as triacetin, or less than about 17%, less than about 16% or less than about 15%. More preferably, the tubular body 3 comprises from 10% to 20% by weight of plasticizer, for instance about about 11%, about 12%, about 13%, about 15%, about 17%, about 18% or about 19% plasticizer. In some embodiments, the permeability of the material of the wall of the first tubular body 3 is at least too Coresta Units and, preferably, at least 500 or 1000 Coresta Units.
It has been found that the relatively high permeability of the first tubular body 3 increases the amount of heat that is transferred to the first tubular body 3 from the aerosol and thus reduces the temperature of the aerosol. The permeability of the first tubular body 3 has also been found to increase the amount of moisture that is transferred from the aerosol to the first tubular body 3, which has been found to improve the feel of the aerosol in the user's mouth. A high permeability of first tubular body 3 also makes it easier to cut ventilation holes into the first tubular body 3 using a laser, meaning that a lower power of laser can be used.
The first tubular body 3 may comprise a filamentary tow comprising filaments having a cross-section with an isoperimetric ratio L2/A of 25 or less, 20 or less or 15 or less, where L is the length of the perimeter of the cross section and A is the area of the cross section. In other words, the filaments may comprise a substantially ‘o’ shaped cross section, or at least as close as it is possible to achieve. For a given denier per filament, filaments with a substantially ‘o’ shaped cross section have a lower surface area than other cross sectional shapes, such as ‘Y or ‘X’ shaped filaments. Therefore, the delivery of aerosol to the user is improved.
It shall be appreciated that aerosol drawn through the first tubular body 3 passes through both a central cavity 3a in the first tubular body 3 and also partly through the filaments of the first tubular body 3 itself. By providing filaments with a substantially ‘0’ shaped cross section, a greater proportion of aerosol will pass through the filament of the first tubular body 3 itself, increasing heat transfer to the first tubular body 3 yet further. In some embodiments, the aerosol generating material 2 described herein is a first aerosol generating material 2 and the first tubular body 3 may comprise a second aerosol generating material. For example, the second aerosol generating material may be disposed on an inner surface of the first tubular body 3.
The second aerosol generating material comprises at least one aerosol former material, and may also comprise at least one aerosol modifying agent, or other sensate material. The aerosol former material and, or aerosol modifying agent can be any aerosol former material or aerosol modifying agent as described herein, or a combination thereof.
In use, as the aerosol generated from the first aerosol generating material 2 is drawn through the first tubular body 3, heat from the first aerosol may aerosolize the aerosol forming material of the second aerosol generating material, to form a second aerosol. The second aerosol may comprise a flavorant, which may be additional or complementary to the flavor of the first aerosol.
The article 1 may further comprise at least one ventilation area 12 arranged to allow external air to flow into the article. In the illustrated embodiments, the ventilation area 12 comprises a row of ventilation apertures, or perforations, cut into the wrapper 6. The ventilation apertures may extend in a line around the circumference of the article 1. The ventilation area 12 may comprise two or more rows of ventilation apertures. By providing a ventilation area 12, ambient air may be drawn into the article during use to further cool the aerosol.
In the illustrated embodiments, the at least one ventilation area 12 is arranged to provide external air into the cavity 3a of the first tubular body 3. To achieve this, the one or more rows of ventilation apertures extend around the circumference of the article over the first tubular body 3. Suitably, the ventilation area 12 may be provided at a position between 14 mm and 20 mm downstream of the aerosol generating material 2. For instance, the ventilation area may be provided at a position about 14.5 mm or 18.5 mm downstream of the aerosol generating material 2. In other examples, ventilation may be provided at a position 22.5 mm upstream of the mouth end of the article. In one example, the ventilation area 12 comprises a single row of perforations formed as laser perforations. In some other examples, the ventilation area comprises first and second parallel rows of perforations formed as laser perforations, for instance at positions 17.925 mm and 18.625 mm respectively from the mouth end. These perforations pass though the wrapper 6 and first tubular body 3. In alternative embodiments, the ventilation can be provided at other locations.
In some examples, the perforations pass through the full thickness of the wall of the hollow tubular body 3. In other examples, the ventilations may be formed through only a portion of the wall thickness of the tubular body. For example, the ventilation perforation may extend into the tubular body by a depth of up to about 0.2 mm, or up to about 0.3 mm, or up to about 0.5 mm, or up to about 1 mm, or up to about 1.5 mm.
Alternatively, the ventilation can be provided via a single row of perforations, for instance laser perforations, into the portion of the article 1 in which the first tubular body 3 is located. This has been found to result in improved aerosol formation, which is thought to result from the airflow through the perforations being more uniform than with multiple rows of perforations, for a given ventilation level. In the present example, the ventilation area 12 comprises a single row of laser perforations 18.5 mm downstream of the aerosol generating material 2.
It shall be appreciated that the exact location of the at least one ventilation area 12 is not essential. In another embodiment, the at least one ventilation area 12 is arranged to provide external air into the aerosol generating material 2. To achieve this, the one or more rows of ventilation apertures extend around the circumference of the article over the rod of aerosol generating material 2.
The level of ventilation provided by the at least one ventilation area 12 is within the range of 40% to 70% of the volume of aerosol generated by the aerosol generating material 2 passing through the article 1, when the article 1 is heated in the non-combustible aerosol provision device too.
Aerosol temperature has been found to generally increase with a drop in the ventilation level. However the relationship between aerosol temperature and ventilation level does not appear to be linear, with variations in ventilation, for instance due to manufacturing tolerances, having less impact at lower target ventilation levels. For instance, with a ventilation tolerance of ±15%, for a target ventilation level of 75%, the aerosol temperature could increase by approximately 6° C. at the lower ventilation limit (60% ventilation). However, with a target ventilation level of 60% the aerosol temperature may only increase by approximately 3-5° C. at the lower vent limit (45% ventilation). The target ventilation level of the article can therefore be within the range 40% to 70%, for instance, 45% to 65% The mean ventilation level of at least 20 articles can be between 40% and 70%, for instance between 45% and 70% or between 51% and 59% In some embodiments, an additional wrapper to at least partially surrounds the aerosol generating material 2, between the aerosol generating material 2 and the wrapper 6. In particular, during manufacture of the article, the aerosol generating material is first wrapped by additional wrapper 10 before being attached in combination with the other components of the article 1 by wrapper 6.
In some embodiments, the additional wrapper 10 surrounding the aerosol generating material has a high level of permeability, for example greater than about 1000 Coresta Units, or greater than about 1500 Coresta Units, or greater than about 2000 Coresta Units. The permeability of the additional wrapper 10 can be measured in accordance with ISO 2965:2009 concerning the determination of air permeability for materials used as cigarette papers, filter plug wrap and filter joining paper.
The additional wrapper 10 may be formed from a material with a high inherent level of permeability, an inherently porous material, or may be formed from a material with any level of inherent permeability where the final level of permeability is achieved by providing the additional wrapper 10 with a permeable zone or area. Providing a permeable additional wrapper 10 provides a route for air to enter the smoking article. The additional wrapper 10 can be provided with a permeability such that the amount of air entering through the rod of aerosol generating material 2 is relatively more than the amount of air entering the article 1 through the ventilation area 12 in the mouthpiece. An article 1 having this arrangement may produce a more flavorsome aerosol which may be more satisfactory to the user.
In the embodiment illustrated by
The second tubular body 5 is formed from paper. Specifically, the second tubular body 5 comprises a paper tube 5 underlying the wrapper 6. The paper tube provides additional rigidity to the cavity Sa. Specifically, the second tubular body 5 is formed from a plurality of layers of paper which are parallel wound, with butted seams, to form the tubular member 5. In the present example, first and second paper layers are provided in a two-ply tube, although in other examples 3, 4 or more paper layers can be used forming 3, 4 or more ply tubes. Other constructions can be used, such as spirally wound layers of paper, cardboard tubes, tubes formed using a papier-mache type process, molded or extruded plastic tubes or similar. In some examples, the second tubular body 5 may be formed from fibrous tow, as described for first tubular body 3.
The second tubular body 5 can also be formed using a stiff plug wrap and/or tipping paper, for instance as the wrapper 6 and/or further wrapper 6′, meaning that a separate tubular element is not required, as illustrated in
In addition, it has surprisingly been found that the use of first tubular body 3 immediately upstream of body 21 can further reduce the condensation of desirable components of the aerosol in the body 21. Without wising to be bound by theory, it is hypothezhypothezized that this is due to the first tubular body 3 channelingchanneling aerosol through the centercenter of the body 21 at an increased flow rate, while the length of the cylindrical body 21 further reduces condensation in the body. In addition, by increasing the proportion of the aerosol channeled through the centercenter of the cylindrical body 21, the cross sectional area of the cylindrical body through which aerosol passes is effectively reduced, further reducing the potential condensation of desirable components of the aerosol in the cylindrical body 21. The first tubular body 3 and second tubular body 5 are also referred to as cooling sections, and the cavities 5a, 3a defined thereby are also referred to as respective first and second cavities Sa, 3a.
The second tubular body 5 and first tubular body 3 are each located around and define respective air gaps within the mouthpiece 20 which act as cooling segments. The air gaps provide chambers through which heated volatilizvolatilized components generated by the aerosol generating material 2 flow.
Preferably, the first cavity 5a has an internal volume greater than about 300 mm3 and/or the second cavity 3a has an internal volume greater than about too mm3. For instance, the first cavity 5a may have an internal volume of about 310 mm3 or about 330 mm3, and the second cavity 3a may have an internal volume of about I20 mm3.
Providing cavities of at least these volumes has been found to enable the formation of an improved aerosol, as well as providing the cooling function described herein. Such cavity sizes provide sufficient space within the mouthpiece to allow heated volatilizvolatilized components to cool, therefore allowing the exposure of the aerosol generating material 2 to higher temperatures than would otherwise be possible, since that may result in an aerosol which is too warm. Surprisingly, the relative internal diameters and length of the first and second cavities has been found to be important for improving the quality of the aerosol. It has been advantageously found that providing a second tubular body 5 having a length less than 18 mm, or less than the length of the aerosol generating material 2, reduces the likelihood of desirable components of the aerosol condensing on the inner surface of the second tubular body 5. It has also been surprisingly found that providing a first tubular body 3, having a smaller inner diameter than hollow tubular body 5, immediately downstream of the second tubular body 5 provides a further improvement in the aerosol by channelingchanneling the hot aerosol through the centercenter of the first tubular body 5, further reducing condensation on the inner surface of the tubular bodies. The inner diameters of each of the first tubular body 3 and the second tubular body 5 maybe selected from a range of about 2 mm to about 6 mm, about 2 mm to about 5 mm, about 2.5 mm to about 4.5 mm and about 3.0 mm to about 4 mm. The inner diameter of the first tubular body 3 is selected to be smaller than the inner diameter of the second tubular body 5.
The second cavity can, for instance, have an internal volume greater than 75 mm3, for instance greater than 90 mm3, 100 mm3, 140 mm3, or 150 mm3, allowing further improvement of the aerosol. In some examples, the second cavity 3a comprises a volume of between about 130 mm3 and about 180 mm3, for instance about 150 mm3.
The first cavity can, for instance, have an internal volume greater than too mm3, for instance greater than 200 mm3, 300 mm3, 350 mm3, 400 mm3, or 500 mm3, allowing further improvement of the aerosol. In some examples, the first cavity 5a comprises a volume of between about 300 mm3 and about 400 mm3, or between about 340 mm3 and about 360 mm3 for instance about 350 mm3.
The second tubular body 5 can be configured to provide a temperature differential of at least 40 degrees Celsius between a heated volatilized component entering a first, upstream end of the hollow tubular member 5 and a heated volatilized component exiting a second, downstream end of the second tubular body 5. The second tubular body 5 is preferably configured to provide a temperature differential of at least 60 degrees Celsius, preferably at least 80 degrees Celsius and more preferably at least too degrees Celsius between a heated volatilized component entering a first, upstream end of the hollow tubular member 5 and a heated volatilized component exiting a second, downstream end of the second tubular body 5. This temperature differential across the length of the second tubular body 5 protects the temperature sensitive second body of material 21 from the high temperatures of the aerosol generating material 2 when it is heated.
The first tubular body 3 can be configured to provide a temperature differential of at least 5 degrees Celsius between a heated volatilized component entering a first, upstream end of the first tubular body 3 and a heated volatilized component exiting a second, downstream end of the first tubular body 3. The first tubular body 3 is preferably configured to provide a temperature differential of at least 10 degrees Celsius, preferably at least 12 degrees Celsius and more preferably at least 15 degrees Celsius between a heated volatilized component entering a first, upstream end of the first tubular body 3 and a heated volatilized component exiting a second, downstream end of the first tubular body 3.
In the embodiments illustrated by
The third tubular body 22 defines a cavity 22a in the mouth end section 20 that opens at the mouth end.
In some embodiments, it can be particularly advantageous to use a tubular body 22 having a length of greater than about 10 mm, for instance between about 10 mm and about 30 mm or between about 12 mm and about 25 mm. It has been found that a consumer's lips are likely to extend in some cases to about 12 mm from the mouth end of the article 1 when drawing aerosol through the article 1, and therefore a tubular body 22 having a length of at least 10 mm or at least 12 mm means that most of the consumer's lips surround this element.
Preferably, the length of the third tubular body 22 is less than about 20 mm More preferably, the length of the third tubular body 22 is less than about 15 mm. Still more preferably, the length of the third hollow tubular body 22 is less than about 10 mm. In addition, or as an alternative, the length of the third tubular body 22 is at least about 5 mm. Preferably, the length of the third tubular body 22 is at least about 6 mm. In some preferred embodiments, the length of the third tubular body 22 is from about 5 mm to about 20 mm, more preferably from about 6 mm to about 10 mm, even more preferably from about 6 mm to about 8 mm, most preferably about 6 mm, 7 mm or about 8 mm.
In the present example, the length of the third hollow tubular body 22 is 6 mm.
In other embodiments, it can be beneficial to use a tubular body 22 having a length less than about 10 mm, for instance between about 6 mm and about 9 mm, for instance about 6 mm. It has been found that reducing the length of the mouth end section 20 can reduce the condensation of desirable components of the aerosol on the components of the article, and thereby result in delivery of an improved aerosol to the user.
The use of the third tubular body 22 has also been found to significantly reduce the temperature of the outer surface of the article 1 even upstream of the tubular body 22. Without wishing to be bound by theory, it is hypothesized that this is due to the third hollow tubular body 22 channeling aerosol closer to the center of the mouth end section 20, and therefore reducing the transfer of heat from the aerosol to the outer surface of the article.
The third hollow tubular body 22 preferably has an internal diameter of greater than 3.0 mm Smaller diameters than this can result in increasing the velocity of aerosol passing though the mouth end section 20 to the consumers' mouth more than is desirable, such that the aerosol becomes too warm, for instance reaching temperatures greater than 40° C. or greater than 45° C. More preferably, the tubular body 22 has an internal diameter of greater than 3.1 mm, and still more preferably greater than 3.5 mm or 3.6 mm. In one embodiment, the internal diameter of the tubular body 22 is about 3.9 mm.
The “wall thickness” of the third tubular body 22 corresponds to the thickness of the wall of the tube 22 in a radial direction. This may be measured in the same way as for first tubular body 3. The wall thickness is advantageously greater than 0.9 mm, and more preferably 1.0 mm or greater. Preferably, the wall thickness is substantially constant around the entire wall of the third hollow tubular element 22. However, where the wall thickness is not substantially constant, the wall thickness is preferably greater than 0.9 mm at any point around the third hollow tubular element 22, more preferably 1.0 mm or greater. In the present example, the article 1 includes a body of material 21. The body of material is substantially cylindrical, and positioned immediately downstream of the first tubular body 3. The body of material 21 is wrapped in an additional wrapping material, such as a first plug wrap 23. Preferably, the first plug wrap 23 has a basis weight of less than 50 gsm, more preferably between about 20 gsm and 40 gsm.
Preferably, the first plug wrap 23 has a thickness of between 30 pm and 60 pm, more preferably between 35 pm and 45 pm.
In other examples, the first plug wrap 23 has a basis weight greater than 65 gsm, for instance greater than 80 gsm, or greater than 95 gsm. In some examples, the first plug wrap 23 has a basis weight of about too gsm. It has advantageously been found that providing a first plug wrap having a basis weight in these ranges and comprising an embossed pattern can reduce the temperature of the external surface of the article 1 at a position overlying the body 21. For instance, first plug wrap 23 maybe provided with an embossed pattern comprising a hexagonal repeating pattern, a linear repeating pattern, or a series of raised areas having any suitable shape. Without wishing to be bound by theory, it is thought that providing an embossed first plug wrap 23 can provide an air gap between the plug wrap and the additional wrapper 10, which can reduce heat transfer to the external surface of the article 1.
Preferably, the first plug wrap 23 is a non-porous plug wrap, for instance having a permeability of less than too Coresta units, for instance less than 50 Coresta units. However, in other embodiments, the first plug wrap 23 can be a porous plug wrap, for instance having a permeability of greater than 200 Coresta units.
The third tubular body 22 is separated from the first tubular body 3 by the body of material 21.
Preferably, the length of the body of material 21 is less than about 15 mm. More preferably, the length of the body of material 21 is less than about 10 mm. In addition, or as an alternative, the length of the body of material 21 is at least about 5 mm. Preferably, the length of the body of material 21 is at least about 6 mm. In some preferred embodiments, the length of the body of material 21 is from about 5 mm to about 15 mm, more preferably from about 6 mm to about 12 mm, even more preferably from about 6 mm to about 12 mm, most preferably about 6 mm, 7 mm, 8 mm, 9 mm or 10 mm. In the present example, the length of the body of material 21 is 10 mm. The body of material 21, also referred to as cylindrical body 21, can be formed without any cavities or hollow portions, for instance without cavities or hollow portions having a dimension greater than 0.5 mm therein. For instance, the cylindrical body of material can comprise material which extends substantially continuously throughout its volume. It can, for instance, have a density which is substantially uniform across its diameter and/or along its length.
In the present example, the body of material 21 is formed from filamentary tow. In the present example, the tow used in the body of material 21 has a denier per filament.
(d.p f.) of 8.4 and a total denier of 21,000. Alternatively, the tow can, for instance, have a denier per filament (d.p.f.) of 9.5 and a total denier of 12,000. Alternatively, the tow can, for instance, have a denier per filament (d.p f.) of 8 and a total denier of 15,000. In the present example, the tow comprises plasticized cellulose acetate tow. The plasticizer used in the tow comprises about 7% by weight of the tow. In the present example, the plasticizer is triacetin. In other examples, different materials can be used to form the body of material 21. For instance, rather than tow, the body 21 can be formed from paper, for instance in a similar way to paper filters known for use in cigarettes. Alternatively, the body 21 can be formed from tows other than cellulose acetate, for instance polylactic acid (PLA), other materials described herein for filamentary tow or similar materials. The tow is preferably formed from cellulose acetate. The tow, whether formed from cellulose acetate or other materials, preferably has a d.p.f. of at least 5, more preferably at least 6 and still more preferably at least 7. These values of denier per filament provide a tow which has relatively coarse, thick fibers with a lower surface area which result in a lower pressure drop across the body of material 21 than tows having lower d.p.f. values. Preferably, to achieve a sufficiently uniform body of material 21, the tow has a denier per filament of no more than 12 d.p.f., preferably no more than 11 d.p.f. and still more preferably no more than 10 d.p.f. The total denier of the tow forming the body of material 21 is preferably at most 30,000, more preferably at most 28,000 and still more preferably at most 25,000. These values of total denier provide a tow which takes up a reduced proportion of the cross sectional area of the article 1 which results in a lower pressure drop across the article 1 than tows having higher total denier values. For appropriate firmness of the body of material 21, the tow preferably has a total denier of at least 8,000 and more preferably at least 10,000. Preferably, the denier per filament is between 5 and 12 while the total denier is between 10,000 and 25,000 More preferably, the denier per filament is between 6 and 10 while the total denier is between 11,000 and 22,000. Preferably the cross-sectional shape of the filaments of tow are ‘Y’ shaped, although in other embodiments other shapes such as ‘X’ shaped or ‘O’ shaped filaments can be used, with the same d.p.f and total denier values as provided herein. The tow may comprise filaments having a cross-section with an isoperimetric ratio of 25 or less, preferably 20 or less, and more preferably 15 or less. In some examples, the body of material 21 may comprise an adsorbent material (e.g. charcoal) dispersed within the tow.
Irrespective of the material used to form the body 6, the pressure drop across body 6, can, for instance, be between 0.2 and 5 mmWG per mm of length of the body 6, for instance between 0.5 mmWG and 2 mmWG per mm of length of the body 6. The pressure drop can, for instance, be between 0.5 and 1 mmWG/mm of length, between 1 and i.5 mmWG/mm of length or between 1.5 and 2 mmWG/mm of length. The total pressure drop across body 6 can, for instance, be between 2 mmWG and 8 mWG, or between 4 mmWG and 7 mmWG. The total pressure drop across body 6 can be about 5, 6 or 7 mmWG. In some examples, the body of material 21 may comprise a capsule. The capsule can comprise a breakable capsule, for instance a capsule which has a solid, frangible shell surrounding a liquid payload. In some examples, a single capsule is used. The capsule is entirely embedded within the body of material 21. In other words, the capsule is completely surrounded by the material forming the body. In other examples, a plurality of breakable capsules may be disposed within the body of material 21, for instance 2, 3 or more breakable capsules. The length of the body of material 21 can be increased to accommodate the number of capsules required. In examples where a plurality of capsules is used, the individual capsules may be the same as each other, or may differ from one another in terms of size and/or capsule payload. In other examples, multiple bodies of material may be provided, with each body containing one or more capsules.
In some embodiments, a non-combustible aerosol provision system is provided comprising an aerosol modifying component and a heater 101 which, in use, is operable to heat the aerosol generating material such that the aerosol generating material provides an aerosol. The aerosol modifying component comprises first and second capsules. The first capsule is disposed in a first portion of the aerosol modifying component and the second capsule is disposed in a second portion of the aerosol modifying component downstream of the first portion. The first portion of the aerosol modifying component is heated to a first temperature during operation of the heater 101 to generate the aerosol and the second portion is heated to a second temperature during operation of the heater to generate aerosol, wherein the second temperature is at least 4 degrees Celsius lower than the first temperature. Preferably, the second temperature is at least 5, 6, 7, 8, 9 or 10 degrees Celsius lower than the first temperature.
The aerosol modifying component may comprise one or more components of the article. In some embodiments, the aerosol modifying component comprises a body of material 21, wherein the first and second capsules are disposed in the body of material 21. The body of material may comprise cellulose acetate. In another embodiment, the aerosol modifying component comprises two bodies of material, wherein the first and second capsules are disposed in the first and second bodies respectively. In some embodiments, the aerosol modifying component alternatively or additionally comprises one or more tubular elements upstream and/or downstream of the body or bodies of material. The aerosol generating component may comprise the mouthpiece.
In some embodiments, the second capsule is spaced from the first capsule by a distance of at least 7 mm, measured as the distance between the center of the first and second capsules. Preferably, the second capsule is spaced from the first capsule by a distance of at least 8, 9 or 10 mm. It has been found that increasing the distance between the first and second capsules increases the difference between the first and second temperatures.
The first capsule comprises an aerosol modifying agent. The second capsule comprises an aerosol modifying agent which may be the same or different as the aerosol modifying agent of the first capsule. In some embodiments, a user may selectively rupture the first and second capsules by applying an external force to the aerosol modifying component in order to release the aerosol modifying agent from each capsule. The aerosol-modifying agent of the second capsule is heated to a lower temperature than the aerosol-modifying agent of the first capsule due to the difference between the first and second temperatures. The aerosol-modifying agents of the first and second capsules can be selected based on this temperature difference. For instance, the first capsule may comprise a first aerosol modifying agent that has a lower vapor pressure than a second aerosol modifying agent of the second capsule. If the capsules were both heated to the same temperature, then the higher vapor pressure of the aerosol modifying agent of the second capsule would mean that a greater amount of the second aerosol modifying agent would be volatized relative to the aerosol modifying agent of the first capsule. However, since the second capsule is heated to a lower temperature, this effect is less pronounced such that a more even amount of the aerosol modifying agents of the first and second capsules are volatized upon breaking of the first and second capsules respectively.
In some embodiments, the first and second capsules have the same aerosol-modifying profiles, meaning that both capsules contain the same type of aerosol-modifying agent and in the same amount such that if both capsules were heated to the same temperature and broken then both capsules would cause the same modification of the aerosol. However, since the first capsule is heated to a higher temperature than the second capsule, more of the aerosol-modifying agent of the first capsule will be, for example, volatized compared to the modifying agent of the second capsule and thus will cause a more pronounced modification of the aerosol than the second capsule. Therefore, despite both capsules being the same, which may make the aerosol modifying component easier and/or less expensive to manufacture, the user can decide whether to break the first capsule to cause a more pronounced modification of the aerosol, or the second capsule to cause a less pronounced modification of the aerosol, or both capsules to cause the greatest modification of the aerosol. In some embodiments, the first and second capsules both comprise first and second aerosol modifying agents. The first aerosol modifying agent has a lower vapor pressure than the second aerosol modifying agent. Thus, when the second capsule is broken, a greater proportion of the second aerosol modifying agent will be vaporised relative to the first aerosol modifying agent in comparison to when the hotter first capsule is broken during use of the system to generate aerosol. Therefore, the same capsule can be used to generate different modifications of the aerosol based on the position of the capsule in the first or second portion of the aerosol modifying component.
The capsule has a core-shell structure. In other words, the capsule comprises a shell encapsulating a liquid agent, for instance a flavorant or other agent, which can be any one of the flavorants or aerosol modifying agents described herein. The shell of the capsule can be ruptured by a user to release the flavorant or other agent into the body of material 21. The first plug wrap 23 can comprise a barrier coating to make the material of the plug wrap substantially impermeable to the liquid payload of the capsule. Alternatively or in addition, the wrapping material 6 can comprise a barrier coating to make the material of the wrapping material 6 substantially impermeable to the liquid payload of the capsule.
In some examples, the capsule is spherical and has a diameter of about 3 mm. In other examples, other shapes and sizes of capsule can be used. The total weight of the capsule maybe in the range about 10 mg to about 50 mg.
It is known to generate, for a given tow specification (such as 8.4Y21000), a tow capability curve which represents the pressure drop through a length of rod formed using the tow, for each of a range of tow weights Parameters such as the rod length and circumference, wrapper thickness and tow plasticizer level are specified, and these are combined with the tow specification to generate the tow capability curve, which gives an indication of the pressure drop which would be provided by different tow weights between the minimum and maximum weights achievable using standard filter rod forming machinery. Such tow capability curves can be calculated, for instance, using software available from tow suppliers. It has been found that it is particularly advantageous to use a body of material 21 which includes filamentary tow having a weight per mm of length of the body of material 21 which is between about 10% and about 30% of the range between the minimum and maximum weights of a tow capability curve generated for the filamentary tow. This can provide an acceptable balance between providing enough tow weight to avoid shrinkage after the body 21 has been formed, providing an acceptable pressure drop, while also assisting with capsule placement within the tow, for capsules of the sizes described herein. A control sample and an article according to the claimed invention were tested, as described below, to determine the distribution of nicotine and glycerol, desirable components of the aerosol, throughout the article after use. The pre-use level of glycerol and nicotine in the aerosol generating material was also determined using mass balance analyzis, as described below. The control sample comprises an aerosol generating material section having a length of 30 mm, a second tubular body 5 arranged immediately downstream of the aerosol generating section, having a length of 17 mm, a cylindrical body 21 having a length of 10 mm, and a third tubular body 22 having a length of 6 mm. Sample A has a construction as illustrated in and generally described with reference to
To obtain the data provided in tables 1 and 2 above, mass balance analyzis was performed to determine the amount of a given substance (in the examples in tables 1 and 2 herein, nicotine and glycerol respectively), present in a given section of the article after use. Mass balance analyzis was also used to determine the amount of nicotine and glycerol present in a given section of the article prior to use, so that both the distribution of the substance in the article and the amount present in the aerosol generated from an article could be compared to the total amount of the substance initially provided.
As would be evident to the skilled person, where ‘the article’ is referred to in relation to this data and the experimental methods by which the data was obtained, ‘the article’ does not refer to a single specific article, but rather an article having a specific design or configuration, which is therefore comparable to other articles having the same specific design or configuration. A number of such articles will have been analyzed to obtain the values presented herein, which represent mean values, as described in further detail below. As would be clear to the skilled person, the same individual article is not tested both before and after use, to obtain the pre and post use data points. Instead, the pre use data will be obtained from a number of articles having a specific design or configuration, and the post use data will be obtained from a separate number of articles having the same specific design or configuration. To obtain the samples for mass balance analyzis, the article is deconstructed into sections a sample of the relevant section of the article, for example the aerosol generating section, is taken from a number of articles, the number of articles deconstructed to obtain samples is such being sufficient that the total mass of the samples to be analyzed is at least 1 gram. Each sample comprises a number of the relevant components of the deconstructed article (e.g. the aerosol generating material section 2, or the cylindrical body 21 and third tubular body 22), the number being sufficient that the total mass of the components taken from a number of articles have a combined mass of at least 1 gram. Each sample is taken from a different article. Preferably, at least 5 articles are sampled, more preferably 8 articles, to obtain a single 1 gram sample for mass balance analyzis. At least three repetitions of mass balance analyzis, each repetition performed on a new sample obtained from a new set of articles, should be carried out. The average amount of a substance in mg/unit is then obtained from an average of the at least three repetitions (three repetitions×5 to 8 articles sampled per repetition=15 to 24 articles sampled for each average value obtained).
As described above, mass balance analyzis employing the sampling protocol described in the preceding paragraph was performed to determine the pre-use nicotine and glycerol content of the article.
Emissions analyzis can be performed using a standard puffing regime, and a heating device intended for use with the article, to determine the nicotine and glycerol content of the generated aerosol. The puffing regime is according to the ISO intense regime (where this includes a 55 ml puff volume, a 30s interval between puffs, and a 2s puff duration), but with any ventilation in the open configuration. Where the device has any
‘boost’ or additional smoking functions, these should not be used for performing the test.
Following use under the standard puffing regime as described above, samples were then taken from the articles according to the sampling protocol described above, for mass balance analyzis to determine the post use distribution of nicotine and glycerol in the article.
A comparison between the nicotine and glycerol content of the aerosol in the control article and sample A reveals that 78% more nicotine and 85% more glycerol was present in the aerosol produced from sample A. A significantly increased amount of desirable components of the aerosol is therefore available for delivery to a user in articles prepared according to the present disclosure. The data presented in tables 1 and 2 above shows less nicotine and glycerol was present in both the mouth end section and the cooling sections after use in sample A, compared to the control articles. As described above, it is hypothesized that this is due to a reduction in condensation of the aerosol on internal surfaces of the tubular bodies and in the material of the cylindrical body. In the embodiment illustrated by
In an embodiment illustrated by
In another embodiment illustrated by in section by
A method of manufacturing an article 1 for use with a non-combustible aerosol provision device 100 comprising a heater 101 will now be described with reference to
The device too of this example comprises a first end member 106 which comprises a lid 108 which is moveable relative to the first end member 106 to close the opening 104 when no article 110 is in place. In
The device 100 may also comprise an electrical component, such as a socket/port 114, which can receive a cable to charge a battery of the device 100. For example, the socket 114 may be a charging port, such as a USB charging port.
As shown in
The other end of the device furthest away from the opening 104 may be known as the distal end of the device too because, in use, it is the end furthest away from the mouth of the user. As a user draws on the aerosol generated in the device, the aerosol flows away from the distal end of the device too.
The device too further comprises a power source 118. The power source 118 maybe, for example, a battery, such as a rechargeable battery or a non-rechargeable battery. Examples of suitable batteries include, for example, a lithium battery (such as a lithium-ion battery), a nickel battery (such as a nickel-cadmium battery), and an alkaline battery. The battery is electrically coupled to the heating assembly to supply electrical power when required and under control of a controller (not shown) to heat the aerosol generating material. In this example, the battery is connected to a central support 120 which holds the battery 118 in place. The device further comprises at least one electronics module 122. The electronics module 122 may comprise, for example, a printed circuit board (PCB). The PCB 122 may support at least one controller, such as a processor, and memory. The PCB 122 may also comprise one or more electrical tracks to electrically connect together various electronic components of the device 100. For example, the battery terminals maybe electrically connected to the PCB 122 so that power can be distributed throughout the device 100. The socket 114 may also be electrically coupled to the battery via the electrical tracks.
In the example device too, the heating assembly is an inductive heating assembly and comprises various components to heat the aerosol generating material of the article 110 via an inductive heating process. Induction heating is a process of heating an electrically conducting object (such as a susceptor) by electromagnetic induction. An induction heating assembly may comprise an inductive element, for example, one or more inductor coils, and a device for passing a varying electric current, such as an alternating electric current, through the inductive element. The varying electric current in the inductive element produces a varying magnetic field. The varying magnetic field penetrates a susceptor suitably positioned with respect to the inductive element, and generates eddy currents inside the susceptor The susceptor has electrical resistance to the eddy currents, and hence the flow of the eddy currents against this resistance causes the susceptor to be heated by Joule heating. In cases where the susceptor comprises ferromagnetic material such as iron, nickel or cobalt, heat may also be generated by magnetic hysteresis losses in the susceptor, i.e. by the varying orientation of magnetic dipoles in the magnetic material as a result of their alignment with the varying magnetic field. In inductive heating, as compared to heating by conduction for example, heat is generated inside the susceptor, allowing for rapid heating. Further, there need not be any physical contact between the inductive heater and the susceptor, allowing for enhanced freedom in construction and application.
The induction heating assembly of the example device too comprises a susceptor arrangement 132 (herein referred to as “a susceptor”), a first inductor coil 124 and a second inductor coil 126. The first and second inductor coils 124, 126 are made from an electrically conducting material. In this example, the first and second inductor coils 124, 126 are made from Litz wire/cable which is wound in a helical fashion to provide helical inductor coils 124, 126. Litz wire comprises a plurality of individual wires which are individually insulated and are twisted together to form a single wire. Litz wires are designed to reduce the skin effect losses in a conductor. In the example device 100, the first and second inductor coils 124, 126 are made from copper Litz wire which has a rectangular cross section. In other examples the Litz wire can have other shape cross sections, such as circular. The first inductor coil 124 is configured to generate a first varying magnetic field for heating a first section of the susceptor 132 and the second inductor coil 126 is configured to generate a second varying magnetic field for heating a second section of the susceptor 132. In this example, the first inductor coil 124 is adjacent to the second inductor coil 126 in a direction along the longitudinal axis 134 of the device too (that is, the first and second inductor coils 124, 126 to not overlap). The susceptor arrangement 132 may comprise a single susceptor, or two or more separate susceptors. Ends 130 of the first and second inductor coils 124, 126 can be connected to the PCB 122.
It will be appreciated that the first and second inductor coils 124, 126, in some examples, may have at least one characteristic different from each other. For example, the first inductor coil 124 may have at least one characteristic different from the second inductor coil 126. More specifically, in one example, the first inductor coil 124 may have a different value of inductance than the second inductor coil 126. In
In this example, the first inductor coil 124 and the second inductor coil 126 are wound in opposite directions. This can be useful when the inductor coils are active at different times. For example, initially, the first inductor coil 124 may be operating to heat a first section/portion of the article 110, and at a later time, the second inductor coil 126 may be operating to heat a second section/portion of the article 110. Winding the coils in opposite directions helps reduce the current induced in the inactive coil when used in conjunction with a particular type of control circuit. In
The susceptor 132 of this example is hollow and therefore defines a receptacle within which aerosol generating material is received. For example, the article 110 can be inserted into the susceptor 132. In this example the susceptor 120 is tubular, with a circular cross section.
The susceptor 132 may be made from one or more materials. Preferably the susceptor 132 comprises carbon steel having a coating of Nickel or Cobalt.
In some examples, the susceptor 132 may comprise at least two materials capable of being heated at two different frequencies for selective aerosolization of the at least two materials. For example, a first section of the susceptor 132 (which is heated by the first inductor coil 124) may comprise a first material, and a second section of the susceptor 132 which is heated by the second inductor coil 126 may comprise a second, different material. In another example, the first section may comprise first and second materials, where the first and second materials can be heated differently based upon operation of the first inductor coil 124. The first and second materials maybe adjacent along an axis defined by the susceptor 132, or may form different layers within the susceptor 132. Similarly, the second section may comprise third and fourth materials, where the third and fourth materials can be heated differently based upon operation of the second inductor coil 126. The third and fourth materials maybe adjacent along an axis defined by the susceptor 132, or may form different layers within the susceptor 132. Third material may the same as the first material, and the fourth material may be the same as the second material, for example. Alternatively, each of the materials may be different. The susceptor may comprise carbon steel or aluminum for example.
The device too of
The insulating member 128 can also fully or partially support the first and second inductor coils 124, 126. For example, as shown in
In a specific example, the susceptor 132, the insulating member 128, and the first and second inductor coils 124, 126 are coaxial around a central longitudinal axis of the susceptor 132.
The device too further comprises a support 136 which engages one end of the susceptor 132 to hold the susceptor 132 in place. The support 136 is connected to the second end member 116. The device may also comprise a second printed circuit board 138 associated within the control element 112.
The device too further comprises a second lid/cap 140 and a spring 142, arranged towards the distal end of the device too. The spring 142 allows the second lid 140 to be opened, to provide access to the susceptor 132. A user may open the second lid 140 to clean the susceptor 132 and/or the support 136.
The device too further comprises an expansion chamber 144 which extends away from a proximal end of the susceptor 132 towards the opening 104 of the device. Located at least partially within the expansion chamber 144 is a retention clip 146 to abut and hold the article no when received within the device 100. The expansion chamber 144 is connected to the end member 106.
In one example, the susceptor 132 has a wall thickness 154 of about 0.025 mm to 1 mm, or about 0.05 mm.
In one example, the susceptor 132 has a length of about 40 mm to 60 mm, about 40 mm to 45 mm, or about 44.5 mm.
In one example, the insulating member 128 has a wall thickness 156 of about 0.25 mm to 2 mm, 0.25 mm to 1 mm, or about 0.5 mm. In use, the article 10 described herein can be inserted into a non-combustible aerosol provision device such as the device 100 described with reference to
The various embodiments described herein are presented only to assist in understanding and teaching the claimed features. These embodiments are provided as a representative sample of embodiments only, and are not exhaustive and/or exclusive. It is to be understood that advantages, embodiments, examples, functions, features, structures, and/or other aspects described herein are not to be considered limitations on the scope of the invention as defined by the claims or limitations on equivalents to the claims, and that other embodiments may be utilized and modifications may be made without departing from the scope of the claimed invention. Various embodiments of the invention may suitably comprise, consist of, or consist essentially of, appropriate combinations of the disclosed elements, components, features, parts, steps, means, etc., other than those specifically described herein. In addition, this disclosure may include other inventions not presently claimed, but which may be claimed in future.
Claims
1. An article for use as or as part of a non-combustible aerosol provision system, the article comprising:
- an aerosol generating material comprising at least one aerosol forming material; and
- a hollow tubular body disposed downstream of the aerosol generating material, the hollow tubular body comprising a wall thickness greater than about 0.5 mm and a density of between about 0.25 and about 0.75 g/cc, wherein at least one ventilation area is arranged to provide external air into the hollow tubular body.
2. The article according to claim 1, wherein the article further comprises a cylindrical body disposed immediately downstream of the hollow tubular body.
3. The article according to claim 2, wherein the article further comprises a second hollow tubular body disposed downstream of the cylindrical body.
4. The article according to claim 1, wherein the first hollow tubular body and/or the second hollow tubular body is formed from paper, plastic, or filamentary tow.
5. The article according to claim 1, wherein the article further comprises a hollow tubular member disposed upstream of the hollow tubular body.
6. The article according to claim 5, wherein the hollow tubular member has a wall thickness less than about 1.5 mm.
7. The article according to claim 5, wherein the hollow tubular member is formed from paper, plastic, or filamentary tow.
8. The article according to claim 1, wherein the hollow tubular body comprises triacetin in an amount less than about 16% by weight of the hollow tubular body, or about 15% by weight of the hollow tubular body, or about 13% by weight of the hollow tubular body.
9. The article according to claim 5, wherein the hollow tubular member has a first inner diameter, and the hollow tubular member has a second inner diameter, and the first inner diameter is greater than the second inner diameter.
10. The article according to claim 3, wherein the second hollow tubular body is disposed at the furthest downstream end of the article.
11. The article according to claim 1, wherein the hollow tubular body has a density between about 0.25 g/cc and about 0.75 g/cc.
12. The article according to claim 5, wherein the hollow tubular member has length less than 20 mm, or less than 19 mm, or less than 18 mm.
13. The article according to claim 5, wherein the aerosol generating material comprises an aerosol generating material section, and the aerosol generating material section has a length greater than a length of the hollow tubular member.
14. A system comprising: an article according to claim 1, and a non-combustible aerosol provision device.
15. A system comprising: a non-combustible aerosol provision device, and an article according to claim 1, wherein the aerosol generating material is provided with an amount of nicotine, and wherein the aerosol generated by the system, in use, comprises at least 30% of the amount of nicotine provided in the aerosol generating material prior to use, or at least 35% of the amount of nicotine provided in the aerosol generating material prior to use, or at least 40% of the amount of nicotine provided in the aerosol generating material prior to use.
16. A system according to claim 19, wherein use comprises following a standard puffing regime.
17. A system comprising: a non-combustible aerosol provision device, and an article according to claim 1, wherein the aerosol generating material is provided with an amount of glycerol, and wherein the aerosol generated by the system, in use, comprises at least 15% of the amount of glycerol provided in the aerosol generating material prior to use, or at least 20% of the amount of glycerol provided in the aerosol generating material prior to use.
18. A system according to claim 1, wherein use comprises following a standard puffing regime.
19. A method of forming an article according to claim 1, the method comprising:
- providing an aerosol generating material comprising at least one aerosol forming material; and disposing a tubular body downstream of the aerosol generating material, the tubular body having a wall thickness greater than about 0.5 mm and a density of between about 0.25 and about 0.75 g/cc; and
- providing a ventilation area arranged to provide external air into the hollow tubular body.
Type: Application
Filed: Dec 21, 2020
Publication Date: Feb 2, 2023
Inventors: Steven Holford (London), Chelsea Bailey (London)
Application Number: 17/757,472
