DK174431B1 - Aerosol forming body for smoking and smoking products with this - Google Patents

Abstract

A member is provided for conducting heat from a combustible fuel element to an 'aerosol' generator which includes aerosol-forming material. The conducting member is spaced from the lighting end of the fuel element by at least 5 mm., and can circumscribe both the fuel element and generator, at least partially. Alternatively, the conductor contacts the fuel element along less than approx. half its length, e.g. it is embedded within it. Pref. the fuel element has a length of less than approx. 30 mm and has a density of about 0.5 g/cc.

Description

DK 174431 B1

The present invention relates to an aerosol forming means for use with a smoking product and a smoking product comprising a fuel element and such aerosol forming means according to the preamble of claim 1 and claim 17, respectively.

Many smoking products have been proposed over the years, especially over the last 20 to 30 years, but none of these products have ever achieved any success in the market.

EP-A-0117355 discloses a cigarette type smoking product having a carbon heat source with an axial flow channel and a separate aroma generator. The heat source (page 2, line 23 to page 7, line 14) is formed by pyrolysis of a preformed tubular lignocellulus oxide material with e.g. 90 mm or 65 mm length (see Comparative Example 10 1 and Example 4, respectively) under specified conditions followed by at least one further specified process step. The aroma generator listed (page 8, lines 8 to 27) comprises a substrate material which may be tobacco, alumina etc. near the mouth end and which impregnates with or inherently contains at least one thermally releasable flavor. The aroma generator may also comprise a foamed core added to flavor within the heat source. A traditional filter may be arranged after the aroma generator. The stated formation of an aerosol during use is described from page 8, line 28 to page 9, line 8. The heat source, aroma generator and filter are shrouded in the cigarette paper.

From Danish Patent Application No. PA 1985 04167 an aerosol forming body is known for use in a smoking product. The aerosol forming member comprises a substrate of porous carbon, tobacco or a mixture of carbon and tobacco. The substrate carries an aerosol-forming substance composed preferably of carbon, hydrogen and oxygen. These substances may be liquid or solid and e.g. be polyhydric alcohols. The substrate is heat stable and withstands temperatures up to 400-600 ° C.

Despite decades of interest and effort, there are still no smoking products on the market that provide the benefits and benefits of conventional cigarette smoking without providing significant quantities of incomplete combustion and pyrolysis products produced by a conventional cigarette. .

It is an object of the present invention to provide an aerosol forming member for a smoking product of the kind having a fuel element and a separate aerosol forming member and having improved durability.

This object is met by the fact that the aerosol-forming body mentioned above is peculiar to the characterizing part of the claim. By the aerosol forming means of the invention, the aerosol forming substance is more effectively retained in the substrate prior to smoking.

10 To resemble the smoke of an ordinary cigarette, in a preferred embodiment of the aerosol forming means of the invention, the substrate carries a volatile tobacco flavor.

According to the invention, it is preferred that the sintered alumina is washed and dried before use to avoid any unwanted taste.

Preferably, the substrate resists temperatures of up to 400 to 600 ° C.

In preferred embodiments, the aerosol forming substance is in solid and / or liquid form.

In order to obtain as much aerosol as possible, it is recommended to use an aerosol-forming substance whose boiling point is in a temperature range up to 500 ° C.

Preferred aerosol-forming substances with which an aerosol easily resembling the smoke of a conventional smoker can easily be formed include polyhydric alcohols, most preferably glycerine and / or propylene glycol and / or triethylene glycol.

3 DK 174431 B1

In order to further enhance the taste of the aerosol obtained by the aerosol forming means of the invention, it is recommended that the tobacco flavor comprises a tobacco extract.

Preferred embodiments of the aerosol forming member of the invention contain an aerosol forming substance comprising a tobacco flavor modifier. In order to mitigate the taste of the aerosol and / or to obtain a caramel flavor aerosol, it is recommended to use a tobacco flavor modifier comprising levulinic acid. Further or as an alternative, the tobacco aroma agent may comprise menthol.

For the purpose of obtaining from a smoking product which includes an aerosol forming means according to the invention, approx. the same number of sugars as a conventional cigarette, it is recommended to use from approx. 20 mg to approx. 120 mg preferably from about 35 mg to approx. 85 mg and especially preferably from about 1 mg. 45 mg to approx. 65 mg of liquid aerosol forming substance.

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The present invention is further directed to a smoking product comprising a fuel element and a physically separated aerosol forming means having one or more of the features listed above.

Preferably, such a smoking product is designed so that over approx. 2% by weight, preferably above approx. 15% by weight, and more preferably about 20% by weight of the aerosol forming substance carried on the substrate is delivered to the user as WTPM.

A preferred embodiment of the invention is a smoking product, preferably in cigarette form, which utilizes a small combustible high density fuel element in conjunction with a physically separated aerosol generating means comprising one or more aerosol forming materials. Preferably, the aerosol generates end member in conductive heat exchange communication with the fuel element and / or is at least part of the fuel element, enclosed by a resilient insulating jacket to reduce radial heat loss. At ignition 25, the fuel element generates heat which is used to evaporate the aerosol forming materials in the aerosol forming means. These volatile materials are then sucked towards the mouthpiece, especially during suction and into the user's mouth, in a tenacious manner like a conventional cigarette smoke.

Smoking products according to the invention can produce significant amounts of aerosol both initially and over the useful life of the product, and can provide the user with the feelings and benefits of cigarette smoking. The aerosol-forming organ produced by the aerosol is produced without significant thermal degradation and delivered advantageously to the user with substantially reduced pyrolysis and incomplete combustion product quantities than normally supplied with a conventional cigarette.

The smoking product of the invention may also include a tobacco charge or plug which can be used to give the aerosol a tobacco flavor. This tobacco charge can be placed between the aerosol forming member and the mouth of the product. Preferably, an annular tobacco section is disposed about the perimeter of the aerosol forming organ, where it also acts as an insulating portion and assists in simulating the aroma and feel of a known cigarette.

A tobacco charge may also be mixed with or used as a substrate for the aerosol forming material. Other substances such as flavorings may also be included in the product to flavor and otherwise alter the aerosol supplied to the user.

As used herein and for the purposes of the present application only, "aerosol" is defined to include vapors, gases, particles and the like, both visible and invisible, and in particular the 20 components which the user perceives to be "smoke-like" generated by heat - the effect of the burning fuel element on substances contained in the aerosol-forming organ, or elsewhere in the product. As defined in this way, "aerosol" includes volatile aromatizers and / or pharmacologically or physiologically active substances, whether or not they produce a visible aerosol.

As used herein, the term "conductive heat exchange compound" is defined as a physical arrangement of the aerosol-forming member and the fuel element, whereby heat is transmitted by conduction from the burning fuel element to the aerosol-forming member, substantially throughout the entire fuel element burning time. Conductive heat exchange connection can be obtained by placing the aerosol forming member in contact with the fuel element and close to the burning element of the fuel element, and / or using a conductive member to transfer heat from the burning fuel to the aerosol forming member. Preferably, both methods are used to provide conductive heat exchange.

As used herein, the term "insulating part" refers to all materials which primarily act as insulators. Preferably, these materials do not burn during use, but they may include slow-burning carbons and similar materials, and in particular materials which melt during use, such as glass fibers with a low temperature gradient. Suitable insulators have a thermal conductivity in g-cal / (s) (cm2) (° C / cm) of less than about 0.05 and preferably less than about 0.02, and more preferably less than about 0.005. See Hackh's Chemical Dictionary, 34 (4th ed., 1969) and Lange's Handbook of Chemistry, 10, pp. 272-274 (11th ed., 1973).

The invention is described in greater detail below on the basis of the drawings, in which fig. 1 - 9 are longitudinal sections through various embodiments of the object of the invention; 1A is a sectional view of the one shown in FIG. 1, taken along line IA-1A in FIG. 1; FIG. 2A is a sectional view of the embodiment shown in FIG. 2 along the line 2A-2A of FIG. 2, 20 FIG. 6A is a section through the embodiment shown in FIG. 6 along line 6A-6A of FIG. 6, FIG. 7A, 7B, 7C and 9A show various designs for flow openings in fuel elements, seen from the end and suitable for use in the embodiments of the invention, FIG. 8A is a sectional view along the line shown in FIG. 8 along 8-8 of FIG. 8, FIG. 8B is an enlarged scale view of a metal container used in the embodiment of FIG.

8; and FIG. 9B is a longitudinal section through a preferred embodiment of a fuel element throughlet opening suitable for use in embodiments of the present invention.

The FIG. 1 illustrated, preferably having the general dimensions as for a conventional cigarette, comprises a short, approximately 20 mm long combustible fuel element 10, an adjacent aerosol forming member 12, and a film-lined paper tube 14 forming in the mouthpiece 15 of the article. In this embodiment, the fuel element 10 is extruded or formed from a mixture containing finely divided or reconstituted tobacco and / or a tobacco substitute and a minor amount of combustible carbon, and is provided with longitudinal holes 16, see FIG. 1A. The ignition end of the fuel element 10 may be tapered or have a reduced diameter to facilitate ignition.

The aerosol forming member 12 comprises a porous carbon mass equipped with one or more channels 17 and impregnated with one or more aerosol forming materials such as triethylene glycol, propylene glycol, glycerine or mixtures thereof.

The film-lined paper tube 14 forming the nozzle of the article surrounds the aerosol-forming member 12 and the rear non-ignition end of the fuel element 10 such that the film-lined tube is spaced about 15 mm from the ignition end of the fuel element.

The tube 14 also forms an aerosol delivery channel 18 between the aerosol-forming member 12 and the mouthpiece of the product 15. The presence of the film-lined tube 14 connecting the non-ignition end of the fuel 10 with the aerosol generator 12 increases the heat transfer to the aerosol generator. The film or foils also help to extinguish the burning cone. When only a small amount of unburned fuel remains, the heat loss through the film helps to reduce the heat, which helps to extinguish the burning cone. The film used in this article is typically an aluminum foil having a thickness of 0.0089 mm, but the thickness and / or nature of the conductor used can be varied to achieve virtually any degree of heat transfer.

5 The embodiment of FIG. 1 illustrated also optionally comprises a tobacco pulp or plug 20 to help give the aerosol aroma. This tobacco charge 20 may be placed at the end of the carbon mass 13 towards the nozzle, see Fig. 1, or it may be placed in the channel 18 at a location spaced from the aerosol generator 12. For convenience, the article may comprise a small cellulose acetate filter 22 as desired. efficiency and located at or close to 10 at the mouth end 15.

The FIG. 2 illustrated embodiment of the invention comprises a short combustible fuel element 24 which is approximately 20 mm long and connected to the aerosol forming member 12 by a heat conducting rod 26, and of a foil lined paper tube 14 which also leads to the mouth of the product 15. The aerosol forming member comprises a thermally stable carbonaceous substrate 28 such as a plug of porous carbon impregnated with one or more aerosol forming materials. This embodiment comprises a void 30 between the fuel element 24 and the substrate 28. The part of the foil-lined tube 14 surrounding this void comprises a plurality of peripheral holes 32 that allow enough atmospheric air to flow into the void to provide a suitable pressure drop. .

20 As shown in FIG. 2 and 2A, the heat conducting means comprises the conductive rod 26 and the foil-lined tube 14, both spaced from the discharge end of the fuel element. The rod 26 is located about 5 mm from the ignition end, the tube about 15 mm. The rod 26 is preferably formed of aluminum and has at least one and preferably from 2 to 5 peripheral ridges 34 for atmospheric air to flow through the substrate. The FIG. 2 has the advantage that atmospheric air introduced into the void 30 contains fewer oxidizing products as it is not sucked through the burning fuel.

8 DK 174431 B1

The FIG. 3 illustrated comprises a fuel element 10 approximately 10 mm long and with a single axial hole 16. The ignition end of the fuel element may again be conical or have a reduced diameter for easier ignition. The substrate 38 of the aerosol generator is a granulated, thermally stable carbon or alumina, impregnated 5 with aerosol forming material. A tobacco pulp 20 is located immediately behind the substrate.

This product is equipped with a cellulose acetate tube 40 instead of the foil lined tube described above. This tube 40 comprises an annular section 42 of resilient resilient cellulose acetate tow which surrounds an optionally disposed plastic tube 44 of polypropylene, Nomex, Mylar or similar material. At the mouth 15 of this element there is a low efficiency cellulose acetate filter plug 45.

The entire length of the item may be encased in cigarette type paper 46. A cork or white color coating 48 may be used on the mouth end to simulate the mouthpiece. A film strip 50 is located on the inside of the paper towards the fuel end of the article. This strip preferably overlaps the rear portion of the fuel element by 2-3 mm and extends to the mouth-facing end of the tobacco batch 20. It may be formed in one piece with the paper, or it may be a separate piece applied before the paper cover.

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The FIG. 4 is similar to that of FIG. 3. In this embodiment, the fuel element 10 is approximately 15 mm long and the aerosol forming member 12 is formed of an aluminum capsule 52 filled with a granular substrate, or as shown in the drawing, a mixture of a granulated substrate 54 and tobacco. 56. Capsule 52 is shrunk at its ends 58, 60 to enclose the material and prevent migration of the aerosol generator. Preferably, the crimped end 58 at the fuel end abuts against the rear end of the fuel element to provide heat transfer by conduit.

A void 62 formed at the end 58 also helps prevent the aerosol generator 25 from migrating to fuels. Longitudinal flow ducts 59 and 61 are provided to allow flow of atmospheric air and the aerosol forming material. The capsule 52 and the fuel element 10 can be joined by known cigarette paper 47 as shown in the drawing, perforated ceramic paper, or a metal strip or tube. If cigarette paper is used, a strip 64 near the rear end of the fuel should be printed or treated with sodium silicate or other known materials causing the paper to extinguish.

If a metal foil is used, it should preferably be disposed about 8-12 mm from the ignition end of the fuel. The entire length of the item may be wrapped with known cigarette paper 46.

The FIG. 5 illustrates the use of a substrate 66 impregnated with one or more aerosol forming materials embedded in a large cavity 68 in the fuel element 10. In this embodiment, the substrate 66 is generally a relatively rigid porous material. The entire length of the article may be wrapped with known cigarette paper 46. This embodiment may also include a foil strip 70 to connect the fuel element 10 to the cellulose acetate tube 40 and to extinguish the fuel. This strip is spaced about 5-10 mm from the ignition end.

The 6 to 8 include an elastic resilient insulating jacket which encloses the fuel element to insulate and assist in concentrating the heat in the fuel element. These embodiments also help reduce the burning fire, cone's flammability and, in some cases, help to simulate the grip as for a known cigarette.

In the embodiment shown in FIG. 6, the fuel element 10 has a plurality of holes 16 and is enclosed by a resilient sheath 72 approximately 0.5 mm thick, as shown in FIG. 6A. This sheath is formed of insulating fibers, such as ceramic (e.g. glass) fibers or non-combustible carbon or graphite fibers. The aerosol forming member 12 comprises a porous carbon mass 13 with a single axial hole 17. In the embodiment shown in FIG. 7, the resilient insulating glass fiber sheath 72 surrounds the periphery of both the fuel element 10 and the aerosol forming member 12, and is preferably a low temperature material which melts during use. This jacket 72 is wrapped with a non-porous paper 73 such as P 878-5, supplied from Kimberley-Clark. In this embodiment, the fuel element is about 15-20 mm long and preferably has 3 or more holes 16 to increase the flow of atmospheric air through the fuel. 3 suitable flow channel arrangements are illustrated in FIG. 7A, 7B and 7C.

In this embodiment, the aerosol forming member 12 comprises a metal container 74 which encloses a granulated substrate 38 and / or densified tobacco 76, which, individually or both, may comprise an aerosol forming material. As illustrated, the open end 75 of the container 74 overlaps the rear portion of the fuel element 10 by 3-5 mm. Alternatively, the open end 75 abuts against the rear end of the fuel element 10. The opposite end of the container 74 is shrunk to form a wall 78 having a plurality of channels 80 for the flow of gases, tobacco flavors, and / or aerosol forming material into the aerosol delivery channel 18.

The plastic tube 44 abuts or preferably overlaps the wall 78 of the metal container 74, and is surrounded by a section of resilient cellulose acetate tow 42 of high density / bulk density. An adhesive layer 82, or other material, may be applied to the fuel end of the bladder 42 to seal the bladder and block an atmospheric flow of air therethrough. A low efficiency filter stopper 45 is disposed at the mouth of the article, and the bladder 42 and filter plug 45 are preferably wrapped with a known prop wrap paper 85. A second layer of cigarette paper 86 may be used to connect the rear portion of the insulating jacket 72 to the tow / filter section.

1 shows a modified embodiment of the embodiment shown in FIG. 7, the insulating sheath may also be used in place of the cellulose acetate bladder 42 such that the sheath extends from the ignition end to the filter plug 45.1 embodiments of this kind are applied to an adhesive layer preferably on the annular section of the filter plug which abuts the end of the insulating sheath, or a short annular bladder section is placed between the insulating jacket and the filter piece with glue applied to both ends.

FIG. 8 illustrates an embodiment in which a 10-15 mm long fuel element 10 is wrapped with an insulating sheath 72 of glass fibers and the aerosol forming member is enclosed by a sheath of tobacco 88. The glass fibers used in this embodiment preferably has a softening temperature below about 650 ° C, such as test fibers 6432 and 6437, delivered from Owens-Coming, Toledo, Ohio, so that they melt during use. The fiberglass and tobacco caps are each wrapped with a prop wrap 85, such as Ecusta 646, and are assembled with a 5 wrap of cigarette paper 89, such as 780-63-5 or P 878-16-2, supplied from Kimberley-Clark.

In this embodiment, the metal capsule 90 overlaps the rear 3-4 mm of the fuel element so that it is positioned approximately 6-12 mm from the ignition end, and the rear portion of the capsule 90 is shrunk to a shape as a rounded tab, see FIG. 8B. In the middle of the capsule and at its mouth there is a channel 91.1 The transition points between the shrunk and shrunken portion of the capsule are 4 additional channels 92. Alternatively, the back of the capsule may have a rectangular or square cross-section instead of the tabs, or a simple tubular capsule with a shrunken mouth end with or without peripheral ducts 92.

At the mouth end of the tobacco sheath 88, there is an mouth end piece 40 comprising an annular section of cellulose acetate tow 42, a plastic tube 44, a low-impact filter piece 45, and layers of cigarette paper 85 and 89. The mouth end piece 40 is connected to the fuel / / capsule end. with capsules on an envelope of nozzle paper 86. As shown, the capsule's plastic tube 44 is spaced apart to the capsule 90. Thus, hot vapors flowing through the channels 92 pass through the tobacco cover 88 where volatile components of the tobacco are evaporated or extracted, and then to the channel 18, where the tobacco sheath 20 abuts against the cellulose acetate bladder 42.

In embodiments of this kind having low-density or density fuel-insulating caps 72, atmospheric air and gases pass through the casing 72 and into the tobacco sheath 88. Thus, the peripheral duct 92 of the capsule may optionally be extracted for tobacco flavor extraction from the tobacco sheath 88.

25 1 the one in ftg. 9, the sheath 94 comprises tobacco or a mixture of tobacco and insulating fibers, such as glass fibers. As shown, the tobacco sheath 94 extends just past the metal container 96 mouth end. In embodiments of this kind, the container 96 is preferably equipped with one or more longitudinal slots 99 on the periphery (preferably 2 slots at 180 ° intervals) so that the vapors from the aerosol generator flow through the annular tobacco section surrounding the aerosol generator to extract tobacco flavorings before entering the duct 18.

5 As illustrated, the tobacco at the fuel element end of the sheath 94 is compressed. This helps reduce air flow through the tobacco, reducing its combustion potential. In addition, the container 96 helps to extinguish the tobacco by helping to lower the heat. This heat-lowering effect helps stifle any combustion of the tobacco surrounding the capsule, and it also contributes to evenly distributing the heat to the tobacco around the aerosol forming member, thereby supporting the release of tobacco flavor components. In addition, it may be desirable to treat that portion of the cigarette paper wrapper 85.89 near the rear end of the fuel with a material such as sodium silicate to help extinguish the tobacco so that it will not burn significantly beyond the exposed portion of the fuel element. Alternatively, the tobacco itself 15 may be treated with a combustion modifier to prevent combustion of the tobacco surrounding the aerosol generator.

Upon ignition of any of the above mentioned embodiments, the fuel element burns and produces the heat used to evaporate the aerosol forming material or materials present in the aerosol generating means. These volatile materials are then sucked toward the mouth end, especially during suction, and into the user's mouth in the same manner as for a known cigarette.

Since the fuel element is relatively short, the hot burning firecone is always close to the aerosol-forming body, which results in maximum heat transfer to the aerosol-forming organ and any tobacco flavor, and the resulting production of 25 aerosol and, optionally, tobacco flavor, especially when the preferred heat-conducting portion is used. . As the fuel element is short, there is never a long section of non-combustible fuel to act as a means for lowering heat, as is common in previous thermal aerosol products. The small source of fuel also tends to reduce the amount of incomplete combustion or pyro ly products, especially in embodiments containing carbon and / or multiple through-openings.

Since the aerosol-forming material is physically separated from the fuel element, it is subjected to substantially lower temperatures than those found in the burning fire cone. This reduces the possibility of heat decomposition of the aerosol generator and associated bad taste.

This results in an aerosol production during suction but minimal aerosol production from the aerosol forming body during wetting.

In the preferred embodiments of the subject matter of the invention, the short fuel element, the recirculated heat-conducting portion, the insulating portion and / or the channels of the fuel interact with the aerosol generator to provide a system capable of producing significant aerosol amounts and, by choice, tobacco flavor at virtually any only sigh.

The close placement of the fire cone by the aerosol generator after a few suctions, in conjunction with the conductive portion, the insulating portion and / or the multiple flow openings in the fuel element, results in a very large heat supply both during suction and for a relatively long period of time. between the sucks.

Without wishing to be bound by theory, it is presumed that the aerosol forming member is maintained at a relatively high temperature between the suction and that the heat supplied during suction, which is significantly increased by means of the preferred flow openings, is used primarily. to evaporate the aerosol forming material. This increased heat transfer ensures more efficient use of available fuel energy, reduces the amount of fuel needed and contributes to delivering early aerosol.

In general, the combustible fuel elements which can be used in the practice of the present invention are less than about 30 mm long. Preferably, the fuel element 25 is about 20 mm or less, especially about 15 mm or less in length. Advantageously, the diameter of the fuel element is about 8 mm or less, preferably between about 3 and 7 mm, and in particular: between 4 and 6 mm. The density of the fuel elements that can be used here ranges from about 0.5 g / cm 3 to about 1.5 g / cm 3, as measured, for example, by mercury displacement. Density is preferably greater than 0.7 g / cm3 and preferably greater than 0.8 g / cm3.1 In most cases, a high density material is desirable as it contributes 5 to ensure that the fuel element will burn long enough to simulate the burning time of a known cigarette and that it will provide sufficient energy to produce the required aerosol amount.

The particularly preferred fuel elements suitable for practicing the present invention are carbonaceous fuel elements (i.e., fuel elements primarily comprising carbon) and described and defined in the claims of U.S. Patent Application No. 650,604 filed on 14. September 1984, and serial no. 769,532, filed August 26, 1985. Carbon-containing fuel elements are particularly advantageous as they produce minimal pyrolysis and incomplete combustion products, produce little or no visible sidestream smoke, and minimal ash, and have a high heat capacity. In particularly preferred embodiments, the aerosol supplied to the user has no significant mutagenic activity as measured by the Ames test. See Ames et al. Mut. Res., 31: 347-364 (1975); Nagas et al., Mut.

Res., 42: 335 (1977).

The aerosol forming means used in the practice of the invention is physically separate from the fuel element. By physically separated, it is meant that the substrate, container or chamber containing the aerosol forming materials is not mixed with or constitutes part of the burning fuel element. As mentioned, this arrangement contributes to reducing or eliminating heat decomposition of the aerosol forming material and the presence of sidestream smoke. While the aerosol forming member is not part of the fuel, it is preferably in conductive heat exchange with the fuel element and preferably abuts or is adjacent to the fuel element. It is better if the conductive heat exchange compound is obtained by means of a heat conducting member, such as a metal tube or foil, which is preferably disposed offset spaced from the ignition end of the fuel.

DK 174431 B1

The aerosol forming member comprises one or more thermally stable materials carrying one or more aerosol forming materials. As used herein, a thermally stable material is one that can withstand high temperatures, for example, 400 ° C - 600 ° C, which occurs close to the fuel, without decomposition or burning. Although not preferred, other aerosol-forming means such as heat-breakable microcapsules or solid aerosol-forming substances are within the scope of the present invention provided that they can release enough aerosol-forming vapors to adequately resemble tobacco smoke. .

Thermally stable materials which can be used as a substrate or carrier for the aerosol forming materials are well known to those skilled in the art. Suitable substrates should be porous and should be able to retain an aerosol-forming material when not in use, and be capable of releasing a potential aerosol-forming vapor upon heating by the fuel element. Substrates, especially particulate molding agents, contain the canister, preferably formed of a conductive material.

Suitable thermally stable materials include alumina which is sintered at a temperature greater than ca. 1000 ° C. A preferred alumina substrate is SMR-14-1896, available from Davidson Chemical Division / W.R. Grace & Co., sintered at high temperatures greater than about 1000 ° C, are washed and dried prior to use.

The aerosol forming means used in connection with the invention is preferably arranged at a distance of not more than about 40 mm, preferably not more than 30 mm and more preferably not more than 20 mm, from the ignition end of the fuel element. The aerosol generator may have different lengths from about 2 mm to about 60 mm, preferably from about 5 mm to 40 mm and especially from about 20 mm to 35 mm. The diameter of the aerosol forming member may vary from about 2 mm to about 8 mm, preferably from about 3 mm to 6 mm. If a non-particulate substrate is used, it may have one or more holes to increase the surface area of the substrate and to increase the air flow and heat transfer.

16 DK 174431 B1

The aerosol-forming material or materials used in the invention must be capable of forming an aerosol at the temperature present in the aerosol-forming member when heated by the burning fuel element. Such materials are preferably composed of carbon, hydrogen and oxygen, but may include other materials. The aerosol-forming materials may be in solid, semi-solid or liquid form. The boiling point of the materials and / or material mixture can be in the range of up to about 500 ° C. Substances with these characteristics include polyhydric alcohols such as glycerine and propylene glycol, as well as aliphatic esters of mono-, di- or polycarboxylic acids such as methyl stearate, dodecandioate, dimethyl tetradodecanedioate and others.

The preferred aerosol forming materials are polyhydric alcohols or mixtures of polyhydric alcohols. Particularly preferred aerosol formers are glycerine, propylene glycol, triethylene glycol or mixtures thereof.

The aerosol forming materials may be dispersed on or in the aerosol forming member at a concentration sufficient to penetrate or coat the substrate, carrier 15 or container. For example, the aerosol-forming substance may be applied at full strength or in a dilute solution by dipping, spraying, vapor deposition or similar methods. Solid aerosol forming components can be mixed in the substrate and evenly distributed throughout the pre-formation.

While the degree of density of the aerosol forming material will vary from carrier to carrier and from one aerosol forming material to the other, the amount of liquid aerosol forming materials can generally range from about 20 mg to about 120 mg, preferably from about 35 mg to about 85 mg, and especially from about 45 mg to about 65 mg. As much as possible of the aero-solder carried on the aerosol-forming body should be provided to the user as WTPM. Preferably, about 2% by weight, or better still, about 15% by weight and more preferably about 25% 20% by weight of the aerosol generator, carried on the aerosol forming member is delivered to the user as WTPM.

in DK 174431 B1 17

The aerosol-forming organ may also comprise one or more volatile flavoring agents such as menthol, vanilin, artificial coffee, tobacco extracts, nicotine, caffeine, spirituosa and other aerosol flavoring agents. It may also include other desirable volatile, solid or liquid materials. Alternatively, these substances used may be arranged between the aerosol forming member and the mouth end, such as in a separate substrate or chamber in the duct leading from the aerosol forming member to the mouth end, or in a tobacco joint used as desired. If desired, these volatiles can be used in place of some or all of the aerosol-forming material, so that the item delivers a non-aerosolar flavor or other material to the user.

A particularly preferred aerosol forming member comprises the aforementioned alumina substrate containing spray-dried tobacco extract, tobacco flavor modifiers such as levulinic acid, one or more aromatizing agents, and an aerosol forming material such as glycerin. Marumerizer ", which particles may be impregnated with one. aerosol forming material.

Products of this kind, and described herein, may be used as, or may be modified to use, drug delivery products for the delivery of volatile pharmacologically or physiologically active materials such as ephedrine, metaproterenol, terbutaline, and the like.

Preferred embodiments of the invention can deliver at least 0.6 mg of aerosol measured as 20 wet total particulate matter (WTPM) in the first three sugars when smoked under FTC smoking conditions. (FTC smoking conditions consist of two seconds suction (35 ml total volume) separated by 58 seconds suction.) More preferred embodiments of the subject matter of the invention may provide 1.5 mg or more aerosol in the first three suctions. In particular, embodiments of the subject matter of the invention which are capable of delivering 3 mg or more aerosol in the first three suctions are preferred when smoked under FTC smoking conditions. Preferred embodiments of the subject matter of the invention further provide an average of at least about 0.5 mg of wet total particulate matter per suction at least over about 6 suction, preferably at least about 10 suction, under FTC smoking conditions.

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Claims (20)

An aerosol forming means (12; 90; 96) for use in a smoking product and comprising a substrate (13; 38; 54; 66) comprising alumina, said substrate carrying an aerosol forming substance composed of at least carbon, hydrogen and oxygen, characterized by the substrate (13; 38; 54; 66) contains alumina sintered at a temperature higher than 1000 ° C. Aerosol forming means according to claim 1, characterized in that the substrate carries a j; volatile tobacco flavor. Aerosol forming means according to claim 1 or 2, characterized in that the sintered alumina is washed and dried before use. Aerosol forming member according to one of the preceding claims, characterized in that the substrate resists temperatures up to 400 to 600 ° C. Aerosol forming means according to one of the preceding claims, characterized in that the aerosol forming substance is in solid form. Aerosol forming means according to one of claims 1 to 4, characterized in that the aerosol forming substance is in liquid form. Aerosol forming member according to one of the preceding claims, characterized in that the boiling point of the substance is in a temperature range up to 500 ° C. Aerosol forming means according to one of the preceding claims, characterized in that the substance comprises polyhydric alcohols. 20 DK 174431 B1 Aerosol forming member according to claim 8, characterized in that the polyhydric alcohol comprises glycerine and / or propylene glycol and / or triethylene glycol. Aerosol forming means according to one of claims 2 to 9, characterized in that the tobacco flavor comprises a tobacco extract. Aerosol forming means according to one of the preceding claims, characterized in that the aerosol forming substance comprises a tobacco flavor modifier. Aerosol forming means according to claim 11, characterized in that the tobacco flavor modifier comprises levulinic acid. Aerosol forming means according to one of claims 1 to 12, characterized in that the tobacco flavor comprises menthol. Aerosol forming means according to one of claims 6 to 13, characterized in that the amount of liquid aerosol forming substance varies from approx. 20 mg to approx. 120 mg. Aerosol forming means according to claim 14, characterized in that the amount of liquid aerosol forming substance varies from approx. 35 mg to approx. 85 mg. Aerosol forming means according to claim 15, characterized in that the amount of aircraft of the aerosol forming substance varies from approx. 45 mg ti! ca. 65 mg. Smoke product, characterized in that it comprises a fuel element (10,24) and a physically separated aerosol-forming means (12, 90, 96) according to one of the preceding claims. Smoking product according to claim 17, characterized in that more than approx. 2% by weight of the aerosol-forming substance carried on the substrate (13; 38; 54; 66) is delivered to the user as WTPM. 21 DK 174431 B1 Smoking product according to claim 17, characterized in that more than approx. 15% by weight of the aerosol forming substance carried on the substrate (13; 38; 54; 66) is delivered to the user as WTPM. 19 DK 174431 B1 Smoking product according to claim 19, characterized in that more than approx. 20% by weight of the aerosol-forming substance carried on the substrate (13; 38; 54; 66) is delivered to the user as WTPM.