JPH0626573B2 - Smoking articles - Google Patents

Abstract

The cigarette has a carbonaceous fuel element. A separate aerosol generator has a substrate bearing an aerosol forming material. The fuel element and substrate are arranged in a conductive relationship, so that the heat-stable substrate receives conductive heat transfer throughout the burning time of the fuel element. The fuel element is less than 30mm in length, with a density of at least 5 g/cc. An insulation material can surround part of the fuel element. The insulation is resilient and at least 15 mm thick. The cigarette also has a mouthpiece.

Description

Description: INDUSTRIAL FIELD OF APPLICATION The present invention is used in smoking articles which produce aerosols resembling cigarette smoke and which contain a minimum amount of incomplete combustion or pyrolysis products. The present invention relates to carbonaceous fuel and its manufacturing method.

[Conventional technology]

Many smoking articles have been proposed over the years, especially over the last 20-30 years, but none of these products have met with industrial success.

Despite decades of interest and effort, smoking articles are still commercially available that provide the actions and benefits associated with conventional tobacco smoking without the delivery of significant amounts of incomplete combustion and pyrolysis products. Absent.

[Problems to be solved by the invention]

The present invention provides, without significant thermal separation of the aerosol forming material and without the presence of significant amounts of pyrolysis or incomplete combustion products,
It relates to a carbonaceous fuel element which provides a smoking article capable of producing a significant amount of aerosol, both over the initial and service life of the product, preferably without significant amounts of sidestream smoke. The smoking article according to the present invention can provide the user with the sensation of smoking tobacco without burning the tobacco.

[Means for solving problems]

These and other advantages are achieved according to the invention by a carbonaceous fuel member having a carbon content of at least 80% by weight, a length of less than 30 mm and at least one longitudinal passage, and a) molding a mixture of carbon and an organic binder having a carbon content of at least 80% by weight into a shaped body of a predetermined shape, and then (b) pyrolyzing the shaped body to convert the binder into carbon. A method of making a carbonaceous fuel component for smoking articles, which comprises converting.

Upon ignition, the fuel member generates heat which is used to vaporize the aerosol forming material in the aerosol generating means. These volatiles are then drawn towards the mouth end, especially during paffing, and into the mouth of the user like conventional cigarette smoke. According to the present invention, the fuel member has less thermal decomposition, does not generate sidestream smoke, and produces less ash. Moreover, the fuel supplies the heat required to vaporize the aerosol forming material during the suction period of the entire smoking time. Preferably, the fuel member is less than 30 mm long, more preferably less than 15 mm long, and at least 0.5 g / cc.
And has one or more longitudinal passages. Advantageously, the aerosol generating means comprises a thermostable support which comprises one or more aerosol-forming substances. Preferably, the heat exchange relationship between the fuel member and the aerosol generating means is achieved by providing a heat transfer member, such as a metal foil, which efficiently transfers heat from the burning fuel member to the aerosol generating means. It The heat transfer member preferably contacts the fuel member and the aerosol generating means around at least a portion of its circumferential surface. Further, at least a portion of the fuel member is preferably provided with a peripheral insulating member, such as a jacket of insulating fibers, which jacket is preferably elastic and has a thickness of at least 0.5 mm and a radial direction. Heat loss and helps to retain and direct this heat from the fuel member towards the aerosol generating means.
The heat insulating member preferably covers at least a part of the fuel member and advantageously at least a part of the aerosol generating means.

Since the preferred fuel member is relatively short, the hot burning fire cone will always be in close proximity to the aerosol generating means to maximize heat transfer to it, especially in embodiments where a heat transfer member is provided. Maximizes the resulting aerosol production. If a relatively short mass of support or carrier is preferably used as an aerosol generating means in the immediate vicinity of the short fuel member, the heat drop (heat) of the support is further increased.
Aerosol generation is increased by minimizing the sink). Because the aerosol-forming material is physically separated from the fuel member, it is exposed to temperatures much lower than those present in the burning pyramid, thereby minimizing the potential for thermal decomposition of the aerosol-forming material. Turn into More particularly preferably, the use of a carbonaceous fuel component substantially free of volatile organic substances eliminates the presence of significant amounts of pyrolysis or incomplete combustion products and also produces significant amounts of sidestream smoke. Occurrence is eliminated.

The smoking article of the present invention will generally be provided with a mouthpiece, for example with means such as a longitudinal passage, for supplying the user with volatile substances generated by the aerosol generating means.
Advantageously, the article has the same overall dimensions as a conventional cigarette so that the mouthpiece and aerosol delivery means generally extend over more than half the length of the article. Alternatively, the fuel member and the aerosol generating means may be used with a separate disposable or reusable suction port,
It can also be made without a built-in mouthpiece or aerosol delivery means.

Further, the smoking article of the present invention may also include a tobacco filler or plug that may be used to add tobacco flavor to the aerosol. Preferably, the tobacco can be placed at the mouth end of the aerosol generating means or mixed with a carrier for the aerosol forming substance. Further, a flavoring agent can be incorporated into the article to flavor the aerosol supplied to the user.

The preferred embodiment of the present invention provides the first three puffs when smoked under FIC smoking conditions as measured as wet total particulate matter.
In f) at least 0.6 mg of aerosol can be delivered. [FTC smoking conditions are 2 seconds of inhalation separated by a smoldering time of 58 seconds (total volume 35
ml)]. A more preferred embodiment of the present invention is
Aerosols of 15 mg or more can be delivered in the first three doses. Particularly preferably, embodiments of the present invention are capable of delivering 3 mg or more aerosol in the first three doses when smoked under FTC smoking conditions. Further preferred embodiments of the present invention provide an average of at least about 0.8 mg of wet total particulate matter per at least about 6 doses, preferably at least about 10 doses under FTC smoking conditions.

Furthermore, the smoking article of the present invention is a chemically simple aerosol consisting essentially of oxides of carbon, air, water, an aerosol having the desired perfume or other desired volatile substance and trace amounts of other substances. Can be supplied. Preferably, this aerosol has no significant mutagenic activity according to the Ames test described below. Further, the article can be substantially ashless so that the user does not have to remove the ash in use.

As used herein, for purposes of illustration only, the term "aerosol", including both visible and invisible, includes vapors, gases, particles, etc., especially from burning fuel members. It is defined to include components such that heat is perceived by the user as "smoke-like substances" that are generated by the action of heat on substances contained within the aerosol generating means or other articles. The term "aerosol" as thus defined also includes volatile flavoring agents and / or pharmaceutical or bioactive agents, whether or not they produce a visible aerosol.

As used herein, the term "heat transfer exchange relationship" refers to the relationship between an aerosol generating means and a fuel member that transfers heat from the burning combustion member to the aerosol generating means over substantially the entire combustion period of the fuel member. Defined as a physical arrangement. The heat transfer exchange relationship is such that heat transfer that transfers heat from the burning fuel member to the aerosol generating means by and / or disposing the aerosol generating means in contact with the fuel member and very close to the burning portion of the fuel member. This is achieved by using a member. Preferably, both of these heat transfer methods are used.

As used herein, the term "carbonaceous" means consisting primarily of carbon.

As used herein, the term "insulation means" means all materials that act primarily as insulation. Preferably, these materials do not burn in use, but include materials such as slow burning carbon, as well as glass fibers, such as low temperature grades, which fuse in use. These insulation materials are g /
It has a heat conductivity in cal (sec) (cm) (° C / cm) of less than about 0.05, preferably less than about 0.02, particularly preferably less than about 0.005 [Hux Chemical Dictionary, p. 34. (4th edition, 1969) and Langes Handbook of Chemistry, Vol. 10, 272.
Pp. 274 (11th edition, 1973)].

Example of Invention

Hereinafter, embodiments of the smoking article of the present invention will be described in detail with reference to the accompanying drawings.

An embodiment of the present invention having the preferred conventional tobacco diameter shown in FIG. 1 is a short burn carbonaceous fuel member 10.
And adjacent aerosol generating means 12 and a foil lined paper tube 14 which forms a mouthpiece 15 for the article. In this embodiment, the fuel member 10 is "blow pipe" charcoal, i.e. carbonized wood, to which is provided five longitudinally extending holes 16 (see Figure 1A). The fuel member 10 is about 20 mm long
However, it is possible to improve the ignition of the charcoal fuel by wrapping it with cigarette wrapping paper if necessary. The paper can be treated with known combustion additives.

The aerosol generating means 12 comprises a plurality of glass beads 20 coated with an aerosol forming substance such as glycerin. These glass beads are held in place by a porous disc 22, which can be made of cellulose acetate. The disc may be provided with a series of circumferential grooves 24 to form a passage between the disc and the foil lining tube 14.

A foil lined paper tube 14 that forms the mouthpiece of the article surrounds the aerosol generating means 12 and the non-ignited rear end of the fuel member 10. Furthermore, the tube forms an aerosol supply passage 26 between the aerosol generating means 12 of the article and the mouth end 15.

The presence of the foil lined tube 14 allows the fuel member 1 to
The non-ignited end of 0 is connected to the aerosol generating means 12 and heat conduction to the aerosol generating means is increased. The foil also helps extinguish the fire cone. When very little unburned fuel remains, the heat loss through the foil acts as a heat drop and helps extinguish the fire cone.

The foil used in this article is typically 0.35 mil (0.0089 mm) thick aluminum foil, but the thickness and / or type of metal used is such that it achieves the desired degree of heat transfer. Can be changed. Other types of heat transfer members can also be used, such as Grafoil available from Union Carbide.

Further, the article shown in FIG. 1 optionally includes a lump or plug of tobacco 28 for imparting fragrance to the aerosol. The tobacco filling 28 can be placed at the mouth end of the disc 22 as shown in FIG. 1, or can be placed between the glass ball 20 and the disc 22.
Further, it can be installed in the passage 26 at a position separated from the aerosol generating means 12.

In the embodiment shown in FIG. 2, the short fuel member 10 is a compressed carbon rod or plug having a length of about 20 mm, which is provided with an axial hole 16. Alternatively, the fuel may be formed from carbonized fibers, preferably holes 16
Corresponding to the axial passage. In this example,
The aerosol generating means 12 comprises a heat-stable, heat-conducting carbonaceous support 30, such as a porous carbon plug, which is impregnated with an aerosol-forming substance. This support is provided with an axial passage 32 as required as shown in FIG. Further, this embodiment includes a chunk of tobacco 28,
This is preferably installed at the mouth end of the support 30. For cosmetic purposes, the article further comprises a high porosity cellulose acetate filter 34, optionally with a circumferential groove 36.
Can be provided to form a passage for the aerosol-forming substance between the filter 34 and the foil tube 14. Second A
As shown in the figure, if necessary, the ignition end 1 of the fuel member
1 can also be tapered to improve ignitability.

The embodiment of the invention shown in FIG. 3 comprises a short combustible carbonaceous fuel member 10 connected to an aerosol generating means 12 by a heat transfer rod 99 and a foil lined paper tube 14 which is also an article. Reaches the mouth end 15 of the. In this embodiment, the fuel member 10 can be blow pipe charcoal or compressed or extruded carbon rods or plugs or other sources of carbonaceous fuel.

The aerosol generating means 12 comprises a heat stable carbonaceous support 30, such as a porous carbon plug, impregnated with an aerosol forming substance. In this specific example, the fuel member 1
There is a void space 97 between 0 and the support 30. The portion of the foil lining tube 14 that surrounds the void space is provided with a plurality of peripheral holes 100 to allow sufficient air to flow into the void space to cause a sufficient pressure drop.

As shown in FIGS. 3 and 3A, the heat transfer means comprises a heat transfer rod 99 and a foil lined tube 14. The heat transfer rod 99 is preferably made of aluminum and is provided with at least one, preferably 2 to 5, peripheral grooves 96 to allow air to pass through the support. The article of FIG. 3 has the advantage of containing less carbon oxidation products because the air introduced into the void space 97 is not drawn through the burning fuel.

The embodiment shown in FIG. 4 comprises a fibrous carbon fuel element 10 such as carbonized cotton or rayon.
The fuel member comprises a single axial bore 16 and the support 38 of the aerosol generating means is a thermally stable granular carbon. A lump of tobacco 28 is placed just behind the support. This article is provided with a cellulose acetate tube 40 in place of the foil lined tube in the previous example.
The tube 40 comprises an annular section 42 of cellulose acetate bundle enclosing an optional plastic (eg polypropylene) tube 44. At the mouth end 15 of this member is a low efficiency cellulose acetate filter plug 45. The entire length of this article is wrapped in a cigarette paper 46. A cork or white ink coating 48 can be used at the mouth end to mimic the tip. The strip foil 50 is positioned inside the paper towards the fuel end of the article. This obi is
Preferably it extends from the rear of the fuel member to the mouth end of the tobacco filling 28. This can be integrated with the paper or can be a separate piece applied before wrapping with paper.

The specific example of FIG. 5 is similar to the specific example of FIG. In this embodiment, the aerosol generating means 12 is formed by an aluminum macrocapsule 52, which is filled with a granular support or a mixture of granular support 54 and tobacco 56 as shown. The macrocapsule 52 has ends 58, 6
It is crimped at 0 to encapsulate the material and prevent movement of the aerosol forming material. Crimped end 58 at the fuel end
Preferably contact the rear end of the fuel member to provide heat transfer. In addition, the void space 62 formed by the end 58 also helps prevent migration of the aerosol forming material to the fuel member. Longitudinal passageways 59 and 61 are provided to allow the passage of air and aerosol forming substances. The macrocapsule 52 and the fuel member 10 are integrated as shown by conventional cigarette paper 47 or by perforated ceramic paper or by strip foil. When using cigarette paper,
The strip 64 near the trailing end of the fuel must be printed or treated with sodium silicate or other known material that extinguishes the paper. The entire length of the article is wrapped with conventional cigarette paper 46.

FIG. 6 shows another embodiment with a compressed carbon fuel plug 10. In this embodiment, the fuel member has a tapered ignition end 11 for facilitating ignition,
And a rear end 9 with a tab for facilitating mounting in the tubular wrapping foil 66. Adjacent to the rear end of the fuel member is an aluminum disc 68 having a central hole 70. A second aluminum disk 72 having a hole 74 as required is provided at the inner end of the aerosol generating means 12. Between them is a zone 76 of particulate matter and a zone 78 of tobacco. The wrapping foil 66 for mounting the fuel member extends beyond the second aluminum disc 72. This embodiment also comprises a hollow cellulose acetate rod 42 with an inner polypropylene tube 44 and a cellulose acetate filter plug 45. The entire length of the article is preferably wrapped with a cigarette paper 46.

The embodiment shown in FIG. 7 illustrates the use of a support 80 embedded within a large cavity 82 in the fuel member 10. In this embodiment, the fuel member is preferably formed from extruded carbon and the support 80 is generally a relatively rigid porous material. The entire length of the article is wrapped with conventional cigarette paper 46. This embodiment may further include a strip foil 84 to connect the fuel member 10 to the cellulose acetate tube 40 and act to extinguish the fuel.

The embodiment shown in FIGS. 8 and 9 includes a non-combustible heat insulating jacket 86 around the fuel member 70 to insulate heat and concentrate heat to the fuel member. These examples also act to reduce the firing capability of the fuel cone.

In the embodiment shown in FIG. 8, both fuel member 10 and support 30 are internally provided with an annular jacket or tube 86 of insulating fibers, such as ceramic (eg glass) fibers. Instead of ceramic fiber,
Non-combustible carbon or graphite fibers can also be used. Preferably, fuel member 10 is an extruded carbon plug having holes 16. In the illustrated embodiment, the igniting end 11 extends slightly beyond the end of the jacket 86 to facilitate ignition. The support 30 is a solid, porous carbon material, although other types of supports can be used. The support and the rear of the fuel member are surrounded by a piece of aluminum foil 87. As shown, the jacketed fuel member / support unit connects to a mouthpiece, such as the elongated cellulose acetate tube 40 as shown, wrapped in conventional cigarette paper 46. The jacket 86 extends to the mouth side end of the support body 30, but a cellulose acetate rod 42 can be substituted.

In the embodiment shown in FIG. 9, an aluminum macrocapsule 52 of the type shown in FIG. 5 is used to enclose the particulate support 52 and the tobacco 56. The macrocapsule is preferably placed entirely within the insulation jacket 86. Further, the ignition end 11 of the fuel member 10 does not protrude from the front end of the jacket 86. Preferably, the macrocapsule and the back of the fuel member are surrounded by a piece of aluminum foil in the same manner as in FIG.

Alternatively, the aluminum foil 52 surrounding the support is crimped only at the mouth end. In this embodiment, the rear end of the fuel member can be inserted into one end of the foil and a polypropylene tube can be mounted around or placed in contact with the mouth end of the foil. You can The entire assembly is wrapped in glass fiber to a conventional tobacco diameter.

When ignited in any of the above embodiments, the fuel member burns to generate heat, which is used to vaporize the aerosol-forming material present in the aerosol generating means. These volatile substances are then sucked, in particular in the direction of the mouth-side end during inhalation, and into the mouth of the user like conventional cigarette smoke.

The fuel member is preferably relatively short so that the burning hot pyramid is always in close proximity to the aerosol generator to maximize heat transfer to the aerosol generating means, and when particularly suitable heat transfer members are used. Maximize the occurrence of.
In addition, the preferred thermal insulation tends to both directly block heat and increase the amount of heat transferred to the aerosol-forming material by concentrating this heat in the direction of the central core of the article.

Because the aerosol-forming material is physically separated from the fuel member, it is exposed to a much lower temperature than in the combustion pyroclastic part. This minimizes the potential for thermal decomposition of the aerosol former. Furthermore, this results in the generation of aerosols on inhalation, but little or no aerosols on smoldering. Furthermore, the use of suitable carbonaceous fuel members and physically separate aerosol generating means eliminates the presence of significant amounts of pyrolysis or incomplete combustion products and prevents the production of significant amounts of sidestream smoke. To be done.

Due to the small size and combustion characteristics of the preferred carbonaceous fuel members used in the present invention, the fuel member generally begins to combust within a few doses over its exposed length. Thus, the portion of the fuel member adjacent the aerosol generating means rapidly heats up, significantly increasing heat transfer to the aerosol generating means, especially for initial and intermediate inhalations. Due to the short length of the preferred fuel member, there is never a long section of non-combustible fuel that acts as a heat drop common to conventional thermal aerosol articles. Heat transfer and aerosol supply by it,
It is enhanced by the use of holes through the fuel member to absorb hot air into the aerosol generator, especially during inhalation.

In a preferred embodiment of the present invention, the short carbonaceous fuel member, the heat transfer member, the heat insulating means, and the passage in the fuel member cooperate with the aerosol generating means to form a system capable of generating a significant amount of aerosol at almost every inhalation. Form. The non-pyramidal part being in close proximity to the aerosol generator, together with the insulating means after a few doses, provides a high heat supply during the inspiration and during the relatively long smoldering period between each inhalation.

Without being bound by theory, the aerosol generating means is maintained at a relatively high temperature between each inhalation, and the additional heat quantity significantly increased by the holes of the fuel member supplied during each inhalation is mainly due to aerosol formation. It appears to be used to vaporize substances. This increased heat transfer helps to make more efficient use of potable fuel energy, reduces the amount of fuel required, and helps deliver aerosol faster. Furthermore, the heat conduction used in the present invention is believed to reduce the combustion temperature of carbon fuels,
This is also due to the CO /
It seems to reduce the CO ₂ ratio. [For example, Gee Hug, General In Organic Chemistry, 5th
92 pages (John Willie & Sons, 196
9)].

Further, the combustion characteristics of the fuel source can be adjusted by appropriately selecting the fuel member, the heat insulation jacket, the wrapping paper, and the heat transfer means. This offers the possibility to regulate the heat transfer to the aerosol generator, varying the number of inhalations and / or the amount of aerosol delivered to the user.

Generally, combustible fuel members that can be used to practice the present invention are less than about 30 mm in length. Advantageously, the fuel member is about 20 mm or less in length, preferably about 15 mm or less. Advantageously, the diameter of the fuel member is about 3
~ 8 mm, preferably about 4-5 mm. The density of fuel components used herein ranges from about 0.5 to about 1.5 g / cc. Preferably, the density is greater than 0.7 g / cc, more preferably greater than 0.8 g / cc. Preferably, the fuel member is provided with one or more longitudinally extending holes, such as the holes 11 shown in FIGS. 1-5. These holes provide porosity and increase the amount of hot gas reaching the support, thereby increasing early morning heat transfer to the support.

The preferred fuel member used herein is primarily formed of carbonaceous material. The carbonaceous fuel member preferably has a length of about 5 to 1
It is 5 mm, more preferably about 8-12 mm. Carbonaceous fuel members having these characteristics provide fuel at least about 7 to about
Sufficient to deliver over 10 doses, normal doses are generally obtained by smoking conventional cigarettes under FTC conditions.

Preferably, this type of fuel member has a carbon content of 60-7.
Although 0% by weight can be used, the preferred result is at least about 80% by weight or more so that the invention provides about 8
The requirement is 0% by weight or more. Excellent results have been obtained with fuel components having a carbon content of greater than about 85% by weight. Fuels with high carbon content form minimal thermal decomposition and incomplete combustion products, produce little or no visible sidestream smoke, produce minimal ash, and have high heat capacity. It is preferable because it has

The carbonaceous material for use in or as a suitable fuel can be obtained from a number of virtually any carbon source known to those skilled in the art. Preferably, the carbonaceous material is obtained by pyrolysis or carbonization of cellulosic materials such as wood, cotton, rayon, tobacco, willow, paper, but carbonaceous materials from other sources can also be used.

In most cases, the carbonaceous fuel element should be capable of being ignited by a conventional cigarette lighter without the use of oxidizers. Combustion characteristics of this type are generally about 400 to about 1000 ° C., preferably about 50, in an inert atmosphere or under reduced pressure.
It can be obtained from cellulosic material that has been previously pyrolyzed at temperatures of 0 to about 950 ° C. Pyrolysis time is not considered critical as long as the core temperature of the pyrolyzate reaches the upper temperature range for at least a few minutes. However, slow pyrolysis with gradually increasing temperature over several hours appears to produce a more uniform material with a high carbon yield.

Although not desirable in most cases, carbonaceous fuel components that require the addition of an oxidant to be ignitable by a cigarette lighter are within the scope of the invention, as well as red heat inhibitors or other types of Also included are carbonaceous materials that require the use of combustion modifiers. Combustion modifiers of this type are disclosed in numerous patents and publications and are known to those skilled in the art.

Particularly suitable carbonaceous fuel components used in the practice of the present invention are substantially free of volatile organic materials. This aims to impregnate or mix the fuel member with a significant amount of a volatile organic substance, such as a volatile aerosol forming agent or a flavoring agent, which may decompose in the burning fuel. Means not to. However,
There may be a small amount of water that is naturally adsorbed by the fuel. Similarly, a small amount of aerosol-forming material may be displaced from the aerosol generating means so that it is present in the fuel member.

A preferred carbonaceous fuel member is a compressed or extruded carbon material made from carbon and a binder by conventional compression molding or extrusion techniques. The preferred activated carbon for this type of fuel component is PCB-G and the preferred non-activated carbon is PXC, both of which are available from Calgon Carbon Corporation of Fitzburg, PA. Other suitable carbons for compression molding and / or extrusion are made from pyrolyzed cotton or pyrolyzed paper.

Binders that can be used to make fuel members of this type are well known in the art. A preferred binder is sodium carboxymethylcellulose (SCMC), which may be used alone or in combination with materials such as sodium chloride, vermiculite, bentonite, calcium carbonate and the like. Other useful binders are gums such as guaia gum and also methylcellulose and carboxymethylcellulose (C
MC) and other cellulose derivatives.

A wide range of binder concentrations can be used. Preferably, the amount of binder is limited to minimize undesired flammable components of the binder. On the other hand, a sufficient amount of binder must be included to retain the fuel component during manufacture and use. Therefore, the amount used depends on the cohesiveness of carbon in the fuel member.

If desired, for example about 650 after forming the fuel member.
Pyrolysis for 2 hours at ℃ to convert the binder to carbon,
As a result, a carbon fuel member of almost 100% can be formed.

Further, the fuel member used in the present invention improves combustion.
One or more additives may also be included, for example up to about 5% by weight sodium chloride and a red heat inhibitor to improve smoldering properties. Further, up to 5% by weight, preferably 1-2% by weight of potassium carbonate can be included to improve the ignitability. Additives that improve the physical properties such as viscous kaolin, serpentine, attapulgite, etc. can also be used.

Another carbonaceous fuel component is a carbon fiber fuel, which can be made by carbonizing fiber precursors such as cotton, rayon, paper, polyacrylonitrile, and the like. Generally, about 650-100 under an inert atmosphere or reduced pressure.
Pyrolysis at 0 ° C., preferably about 950 ° C. for about 30 minutes is sufficient to form suitable carbon fibers with good combustion properties. Further, combustion reforming additives can be added to these fibrous fuels.

The aerosol generating means used in practicing the present invention is physically separate from the fuel member. The term physically separate means that the support, vessel or chamber containing the aerosol-forming substance is not mixed with the combustion fuel member or a part thereof. As mentioned above, this arrangement serves to reduce or eliminate the thermal decomposition of aerosol-forming substances and the presence of sidestream smoke. Not part of the fuel,
The aerosol generating means is in heat transfer exchange relationship with the fuel member and is preferably in contact with or adjacent to the fuel member.

Preferably, the aerosol generating means comprises one or more thermostable materials having one or more aerosol-forming substances. The thermostable materials used herein are those capable of withstanding the high temperatures present in the vicinity of the fuel, for example 400-600 ° C., without decomposition or combustion. The use of this type of material appears to act to maintain the simple "fume" chemistry of the aerosol, as evidenced by the lack of Ames activity in the preferred embodiment. Although not preferred, other aerosol generating means such as heat destructible microcapsules or solid aerosol-forming substances are also within the scope of the invention, provided that they are sufficient to approximate tobacco smoke sufficiently. It is capable of releasing aerosol-forming vapors.

Thermally stable materials that can be used as supports or carriers for aerosol-forming substances are well known to those skilled in the art. Useful supports should be porous, capable of retaining aerosol-forming compounds when not in use and capable of strongly releasing aerosol-forming vapors upon heating by the fuel member.

Useful heat stable materials include heat stable adsorbed carbon such as, for example, porous carbon, black smoke, activated carbon or non-activated carbon. Other suitable materials are, for example, ceramics, glass,
Includes inorganic solids such as alumina, vermiculite, clay (eg bentonite). Presently preferred support materials are carbon felts, fibers and mats, activated carbons and porous carbons such as PC-25 and PG-60 available from Union Carbide and SGL carbon available from Calgon.

Depending on the particulate aerosol activating means used herein, their composition and shape are generally selected from granular, fibrous, porous blocks, solid blocks with one or more axially extending passageways, and the like. be able to. The support, in particular the granular support, can be placed in a container, preferably made of metal foil.

The aerosol generating means used in the present invention is generally about 60 mm or less, preferably about 30 mm from the ignition end of the fuel member.
Hereinafter, it is particularly preferably arranged at a position of 15 mm. The aerosol generating means has a length of about 2 to about 60 mm, preferably about 5 mm.
It can vary from -40 mm, particularly preferably from about 20-35 mm. If a non-particulate support is used, it can be provided with one or more holes to increase the surface area of the support and to increase air flow and heat transfer.

The aerosol forming substance used in the present invention must be capable of forming an aerosol at the temperature existing in the aerosol generating means when heated by the burning fuel member. Preferably, this type of material is composed of carbon, hydrogen and oxygen, but may include other materials. The aerosol-forming substance can be solid, semi-solid or liquid. The boiling point of this material and / or mixture of materials ranges up to about 500 ° C. Substances with these properties are polyhydric alcohols,
For example, glycerin and propylene glycol and aliphatic esters of mono-, di- or poly-carboxylic acids such as methyl stearate, dodecanedioate, dimethyltetradodecanedioate and the like.

Preferably, the aerosol forming substance comprises a mixture of a high boiling low vapor pressure substance and a low boiling high vapor pressure substance. That is, in the first few doses, the substance with a low boiling point supplies most of the initial aerosol, while when the temperature in the aerosol generating means rises, the substance with a high boiling point supplies most of the aerosol.

Suitable aerosol-forming substances are polyhydric alcohols or mixtures of polyhydric alcohols. Particularly suitable aerosol-forming substances are selected from glycerin, propylene glycol, triethylene glycol or mixtures thereof.

The aerosol-forming substance may be dispersed on or in the aerosol generating means in a concentration sufficient to penetrate or coat the support, carrier or container. For example, the aerosol-forming material can be applied in sufficient concentration or as a dilute solution by techniques such as dipping, spraying, vapor deposition and the like. The solid aerosol-forming component can be formed after mixing with the support and uniformly distributing throughout.

The amount of aerosol-forming substance varies from carrier to aerosol-forming substance, but the amount of liquid aerosol-forming substance is generally from about 20 to about 120 mg, preferably from about 35 to about 85 mg, particularly preferably from about 45 to about 65 mg. Can vary in range. As much aerosol-forming substance as possible carried on the aerosol generating means should be supplied to the user as WTPM. Preferably about 2% by weight or more, more preferably 15%, carried by the aerosol generating means.
More than wt.%, Particularly preferably more than about 20 wt.% Of the aerosol-forming substance is supplied to the user as WTPM.

Further, the aerosol generating means includes one or more volatile flavoring agents, such as menthol, vanillin, artificial coffee, tobacco extract, nicotine, caffeine, liquor and the like to impart a fragrance to the aerosol. You can also do it. In addition, it may include any other desired volatile solid or liquid substance.

As noted above, the smoking article of the present invention may also include a tobacco filler or plug that may be used to add tobacco flavor to the aerosol. Preferably, the tobacco is installed at the mouth end of the aerosol generating means,
Alternatively, it can be mixed with a carrier for the aerosol-forming substance. Further, a flavoring agent may be incorporated into the article to flavor the aerosol supplied to the user.

When using a tobacco filling, hot steam passes through the tobacco bed to extract and vaporize volatile components in the tobacco without the need for tobacco burning. Thus, the user of this smoking article breathes in an aerosol containing the quality and fragrance of natural tobacco without the combustion products generated by conventional tobacco.

Alternatively, these optional components are placed between the aerosol generating means and the mouth end, for example on a separate support or chamber in the passageway from the aerosol generating means to the mouth end, or on any tobacco filling. You can also do it. If desired, these volatiles can be used in place of some or all of the aerosol-forming substances, and the article can provide the user with substances such as non-aerosol fragrances.

Articles of the type disclosed herein can also be used or modified as drug delivery articles to deliver pharmacologically or physiologically active volatiles such as ephedrine, metaproterenol, terbutaline.

The heat transfer member preferably used in practicing the present invention is typically a metal foil, such as an aluminum foil, which varies in thickness from about 0.01 mm or less to about 0.1 mm or more. . The thickness and / or type of heat transfer material can be varied to obtain almost any desired degree of heat transfer. As shown in the illustrated embodiment, the heat transfer member may preferably contact or overlap the fuel member and a portion of the aerosol generating means to form a container encapsulating the aerosol-forming substance.

Insulating members that may be used in accordance with the invention are generally inorganic or organic fibers such as glass, aluminum, silica, glassy materials, mineral fibers, carbon, silicon, boron, organic polymers, cellulosics, etc., or mixtures of these materials. It is made from. For example, matte such as silica airgel, perlite, glass,
Non-fibrous insulation materials formed into strips or other shapes can also be used. The preferred insulation is elastic and helps to mimic the feel of a conventional cigarette. These materials act primarily as a thermal insulation jacket, retaining a substantial portion of the heat generated by the burning fuel member and directing it to the aerosol generating means. Since the heat insulation jacket becomes hot to some extent in the vicinity of the burning fuel member, this heat can be further transferred to the aerosol generating means.

Presently preferred insulation materials include ceramic fibers such as glass fibers. Two particularly suitable glass fibers are available from Manning Paper Company of Troy, Inc. (New York) under the names Maniglass 1000 and Maniglass 1200. Generally, the insulating fiber wraps at least a portion of the fuel member and any other desired article portions to a final diameter of about 7-8 mm. For example, a suitable thickness for the heat insulating layer is about 0.5-2.5 mm, preferably about 1-2.5 mm.
It is 2 mm. If possible, glass fiber materials having a low softening point of, for example, about 650 ° C. or lower are suitable.

If the insulating means is fibrous, then preferably barrier means are used at the mouth end of the article. One such barrier means consists of an annular member of dense cellulose acetate bundle, which is in contact with the fibrous heat insulating means and which preferably passes through the bundle at the mouth end, for example sealed with an adhesive. Stop the flow.

In most embodiments of the invention, the fuel / aerosol generating means combination is attached to a mouthpiece, such as the foil lining paper or cellulose acetate / plastic tube shown, but the mouthpiece is in the form of a cigarette holder, for example. It can be provided separately. This member of the article forms a passageway for carrying the vaporized aerosol forming substance into the mouth of the user. Its length (preferably about 50-
60 mm or more), this also keeps the hot cone from moving away from the user's mouth and fingers.

Suitable mouthpieces should be inert to aerosol-forming substances, have a water- or liquid-resistant inner layer, minimize aerosol losses due to condensation or excess, and with other components of the article. It should be able to withstand the temperature at the interface. Suitable mouthpieces include the foil lined tubes shown in Figures 1-3 and the cellulose acetate tubes used in the embodiments of Figures 4-9. Other suitable mouthpieces will be apparent to those of skill in the art.

The mouthpiece according to the invention may optionally also include a "filter" tip used to give the article the appearance of a conventional filtered cigarette. Filters of this type include low density cellulose acetate filters and hollow or baffled plastic filters, such as those made from polypropylene. Further, the entire length of the article or a part thereof may be wrapped with a cigarette paper.

The aerosols produced by the preferred articles of the present invention are chemically simple and consist essentially of aerosols carrying air and oxides of carbon and desired fragrances or other desired volatiles and water and trace amounts of other traces. It consists of a substance. Wet Total Particulate Matter (WTPM) Generated by Preferred Articles of the Invention
Has no mutagenic activity as measured by the Ames test. That is, there is no significant dose-response relationship between the WTPM of the present invention and the number of revertants in standard test organisms exposed to these substances. According to the proposers of the Ames test, a significant dose-dependent response indicates the presence of mutagens in the tested articles [Ames et al., Mutagenesis Research, Vol. 31, 347].
P. 364 (1975); Nagas et al., Mutagenesis Research, Vol. 42, p. 335 (1977)].

〔The invention's effect〕

The smoking article according to the present invention is capable of producing a significant amount of aerosol over its initial use and throughout its service life, with only a significant amount of pyrolysis or incomplete combustion formation accompanied by significant thermal analysis of the aerosol-forming substances. It is possible to give the user the sensation and action of smoking a cigarette without causing a substance or a considerable amount of sidestream smoke and without burning the cigarette.

Yet another advantage of the present invention is that there is little ash produced during use as compared to the ash produced by conventional tobacco. Combustion of a suitable carbon fuel source does not substantially require ash disposal while using this article, as it substantially transforms to almost ashless carbon oxides.

Example of Invention

Hereinafter, the smoking article of the present invention will be described with reference to Examples in order to facilitate understanding of the present invention, but the present invention is not limited thereto. All percentages shown here are weight percentages unless otherwise specified.
Is. All temperatures are expressed in degrees Celsius and are uncorrected.
In all cases, the smoking article has a diameter of about 7-8 mm, a conventional tobacco diameter.

Example 1 A smoking article was prepared according to the specific example shown in FIG. The fuel member is a 25 mm long blow pipe charcoal piece.
Five longitudinal passages of 0.040 inch (1.02 mm) made with a No. 60 drill bit were provided. This charcoal weighed 0.375 g. The fuel element was wrapped in conventional treated cigarette paper. The support was 500 mg glass beads (average diameter 0.64 inches (1.63 mm)), the surface of which was coated with 2 drops (about 50 mg) of glycerin. When filled into a tube, this support had a length of about 6.5 mm.
The foil lined tube had 0.35 inside a 4.25 mil (0.108 mm) layer of white spirally wound paper.
It was constructed as a layer of mil (0.0089 mm) aluminum foil. This tube surrounded the rear 5 mm of the fuel member. A short (8 mm) piece of cellulose acetate with four grooves around it was used to abut the glass beads with the fuel source.
In addition, an 8 mm long grooved cellulose acetate filter piece was additionally inserted into the mouth end of the tube to give the appearance of a conventional cigarette. The total length of the article was about 70 mm.

This type of model supplies a significant amount of aerosol when ignited and inhaled, and the amount of aerosol decreases with 2-3 clothes,
The aerosol was satisfactorily supplied in 4-9 garments. This type of model generally yields about 5-7 mg of wet total particulate matter (WTPM) when mechanically smoked under FTC smoking conditions with a suction capacity of 35 mm, a suction time of 2 seconds and a suction frequency of 60 seconds. It was

Example 2 A. Four smoking articles were prepared having a 10 mm long compressed carbon fuel member and a glass bead support. The fuel element was loaded with about 500 pounds (2273 kg) and had 90% P
It is formed from CB-G and 10% SCMC, and the second
The tapered ignition end shown in Figure A was provided. A single 0.040 inch (1.02 mm) hole was formed in the center of each member. Three of the four fuel sources were wrapped with 8 mm wide conventional cigarette paper. These fuel components were inserted approximately 2 mm into the 70 mm long section of foil lined tubing described in Example 1. Insert the glass beads coated with the amount of glycerin shown in the table below into the open end of a foil lined tube and use a 5 mm long polypropylene foam filter with a series of longitudinal grooves. It was brought into contact with the fuel member. A 5 mm long, low efficiency cellulose acetate filter strip was inserted into the mouth end of each article.
Machine smoke these articles under FTC smoking conditions and wet all particulate matter (WTPM) onto a series of Cambridge pads.
Collected. The results of these experiments are shown in Table I.

B. Three smoking articles similar to those described in Example 2A were prepared, but in this case a length 2 of the type described in Example 1
A 0 mm blowpipe charcoal fuel element was provided. The articles were machine smoked under FTC smoking conditions and the WTPM collected on a series of Cambridge pads. The results of these tests are shown in Table II.

Example 3 A. Make four smoking articles as shown in Figure 2,
These were provided with a 10 mm compressed carbon fuel member with the tapered ignition end shown in FIG. 2A. The fuel components were made from 90% PCB-G carbon and 10% SCMC with a load of approximately 5000 pounds (2273 kg). A 0.040 inch (1.02 mm) hole was drilled in the center of the member. The support for the aerosol-forming material was cut from PC-25, a porous carbon sold by Union Carbide Corporation, Danbury, Conn., And machined and shaped. The support in each article was about 2.5 mm long and about 8 mm in diameter. It was charged with an average of about 27 mg of 1: 1 propylene glycol-glycerin mixture. With the same type of foil lined tube mouthpiece used in Example 1,
The fuel member and the back 2 mm of the support were encapsulated. About 100 mg
The Burley cigarette plug of was abutted against the mouth end of the support. A short baffle polypropylene filter piece about 5-9 mm long was placed at the mouth end of the foil lined tube. A 32 mm long cellulose acetate filter with a hollow polypropylene tube in the core was placed between the cigarette and the filter piece. The total length of each article was about 78 mm.

B. Six additional articles were made in much the same way as in Example 3A, but with the support length increased to 5 mm,
A 0.040 inch (1.02 mm) hole was drilled in the support. In addition, these articles did not include cellulose acetate / polypropylene tubes. About 42 mg of propylene glycol-glycerin mixture was applied to the support. In addition, two valley plugs of about 100-150 mg each were used. The first was brought into contact with the mouth side end of the support, and the second was brought into contact with the filter piece.

C. Four additional articles were made in much the same way as in Example 3A, except that about 100 mg plugs of fire dried tobacco containing about 6 wt% diammonium phosphate were used in place of Burley tobacco plugs.

D. The smoking articles from Examples 3A-C were tested using the standard Ames test [Ames, et al., Mutagenesis Research, Vol. 31, 347-364 (1975),
Nagas et al., Mutagenesis Research, Volume 42, 33
5 (1977) and 113, 173-215 (1983)]. These samples 3A and 3C
35mm suction capacity, 2 seconds suction time and 3
10 doses were smoked with a conventional cigarette smoking device using a 0 second inspiration frequency condition. The smoking article of Example 3B was smoked as well, except that a suction frequency of 60 seconds was used. Only one filter pad was used for each group of articles. This resulted in the wet total particulate matter (WTPM) described below for the groups of articles shown below.

The filter pad of each of the above examples containing the collected WTPM was shaken in DMSO for 30 minutes to dissolve the WTPM. Each sample was then diluted to a concentration of 1 mg / ml and used as such for the Ames test. Using the method of Nagas et al., Mutagenesis Research, Vol. 42, pp. 335-342 (1977), WTP at a concentration of 1 mg / ml.
M was mixed with the S-9 activation system and standard Ames-bacteria cells and incubated at 37 ° C for 20 minutes. The bacterial strain used in this Ames test was Salmonella typhimurium, TA98 [Perchas et al., Nature, 264, 624-62.
P. 7 (1976)]. Then agar was added to the mixture,
A plate was made. The agar plates were incubated at 37 ° C for 2 days and the resulting cultures were counted. Four plates were tested for each dilution and the standard deviation of colonies was compared to pure DMSO control cultures. As shown in Table III, WTPMs obtained from all smoking articles tested did not result in mutagenic activity. This is the average number of revertants per plate and the control (0 μg W
It can be confirmed by comparison with the average number of revertants obtained from TPM / plate). For mutagenic samples, the average number of revertants per plate increases with increasing dose.

Example 4 Five smoking articles as shown in FIG. 2 were prepared. Each article had a 10 mm compressed carbon fuel source as described in Example 3A. The fuel element was inserted 3 mm into one end of a 70 mm long tube lined with aluminum foil of the type described in Example 1. A 5 mm long carbon felt support cut from rayon carbon felt sold by Fiber Materials, Inc. was placed against the fuel source. An average of about 97 for this support
A 1: 1 mixture of glycerin and propylene glycol, about 3 mg of nicotine and about 0.1 mg of perfume mixture was charged. A 5 mm long section of blended tobacco was brought into contact with the mouth end of the support. A 5 mm long piece of cellulose acetate filter was placed at the mouth end of the foil lined tube.

These articles were machine smoked under FTC conditions. Aerosols generated from these articles were collected in a single Cambridge bud (133.3mgWTPM) and 1mgW in DMSO.
Diluted to a final concentration of TPM and tested for Ames activity as described in Example 3D using each of the following strains: Salmonella typhimurium TA1535, 1537,
1538, 98 and 100. As shown in Table IV, WTPM collected from the tested articles did not produce mutagenic activity.

Example 5 A smoking article such as that shown in FIG.
A 10 mm long compressed carbon fuel plug having a shape as shown in FIG. A but containing no tobacco was provided. The fuel member is
90% with a load of about 5000 pounds (2273 kg)
PCB-G activated carbon with 10% SCMC as binder
Created from the mixture with. The fuel member was provided with a 0.040 inch (1.02 mm) longitudinal passage. The support was a 10 mm long porous carbon plug made from Union Carbide PC-25. It was provided with a 0.029 inch (0.74 mm) axial drill hole and filled with 40 mg of a (1: 1) mixture of propylene glycol and glycerin. A foil-lined tube similar to that in Example 1 was used to surround the rear 2 mm of the fuel member to form a mouthpiece. This article was not equipped with a filter tip, but was wrapped with conventional cigarette paper. The total length of the article is 80mm
Met.

The average peak temperature of this article is shown for both "suction" and "smolder" in FIG. As shown, the temperature reliably decreased between the rear end and the mouth end of the fuel member. This ensures that the user does not experience an unpleasant burning sensation when using the article of the present invention.

Example 6 A smoking article was prepared according to the specific example shown in FIG. The fuel member was a 19 mm long blow pipe charcoal piece having no longitudinal passage. 1/8 inch (3.
2 mm) and a length of 28 mm aluminum rod was inserted 15 mm. Four 9 mm x 0.025 inch (0.64 mm) circumferential grooves spaced 90 ° apart were cut into the aluminum rods that penetrate the support. The support was Union Carbide PC-25 carbon with a length of 8 mm. The groove in the aluminum rod extended about 0.5 mm beyond the end of the support in the direction of the fuel. The support was filled with 150 mg of glycerin. The same foil lined tube as in Example 1 encapsulated a portion of the rear of the fuel member. A gap was left between the non-burning end of the fuel member and the support. In this void area, a series of holes were drilled in the foil lined tube to create an air flow. A similar smoking article was made using a compressed carbon fuel plug.

Example 7 A smoking article as shown in FIG. 4 having a carbonized cotton fiber fuel source was prepared. 4 cotton slivers are tightly knit together with cotton threads to a diameter of about 0.4 inch (1
0.2 mm) lobe was created. This material was placed in a furnace in a nitrogen atmosphere and heated to 950 ° C. It took about 1.5 hours to reach this temperature and was then kept at this temperature for 0.5 hours. A 16 mm piece was cut from this pyrolyzed material for use as a fuel member. A 2 mm axial hole 16 was passed through this member with the sample. Fuel member,
Foil lined length 20 of the type described in Example 1
2 mm was inserted into the mm tube. 100 mg of granular Union Carbide PC-25 containing 60 mg of 1: 1 propylene glycol-glycerin mixture was inserted into a foil lined tube. About 60 mg of a 5 mm long tobacco plug was placed immediately after the granular support in the foil lined tube. A 48 mm long annular cellulose acetate tube with a 4.5 mm inner diameter polypropylene tube was inserted about 3 mm into the foil lined tube. A second 50 mm long foil lined tube was fitted onto the cellulose acetate tube until it abuts the 20 mm long foil lined tube. A 5 mm long cellulose acetate filter plug was inserted into the end of this second foil lined tube. The total length was 84 mm. Upon ignition, the article generated a significant amount of aerosol with tobacco flavor over the first 6 doses.

Example 8 A smoking article having a length of 15 mm of fibrous fuel member similar to that described in Example 7 was prepared as shown in FIG. 4 mil (0.10 mm) thick macrocapsule 52
A 15 mm long piece of aluminum foil was prepared and crimped to form a capsule having a length of 12 mm. In this macrocapsule, 100 obtained from Union Carbide
Loosely filled with mg of granular PC-60 carbon and 50 mg of blended tobacco. Granular carbon was impregnated with 60 mg of a 1: 1 mixture of propylene glycol and glycerin. The macrocapsule, the fuel member, and the mouthpiece were integrated with a conventional cigarette paper 85 mm in length.

Example 9 A smoking article having a 7 mm long compressed carbon fuel member containing 90% PXC carbon and 10% SCMC was made according to the embodiment of FIG. Longitudinal passage has a diameter of 0.0
It was 40 inches (1.02 mm). This fuel plug was inserted into a 17 mm long aluminum foil lined tube so that 3 mm of the fuel member was inside the tube. Insert a disk of 8 mm diameter made of 3.5 mil (0.089 mm) thick aluminum foil with a 0.049 inch (1.24 mm) diameter central hole into the other end of the tube. It abuts the end of the fuel source.

Union Carbide PG-60 carbon was granulated and sieved to a particle size of -6 to +10 mesh. 80
mg of this material was used as a support and 80 mg of a 1: 1 mixture of glycerin and propylene glycol was loaded on the support. The impregnated granulate was inserted into the foil tube and abutted against the foil disc at the end of the fuel source. 5
0 mg of blended tobacco was loosely abutted against the granular support. In addition, a foil disc with a 0.049 inch (1.24 mm) central hole was additionally inserted into the foil tube at the mouth end of the cigarette. A long hollow cellulose acetate rod with a hollow polypropylene tube as described in Example 7 was inserted 3 mm into the foil lined tube. A second foil lined tube was fitted onto a cellulose acetate rod and abutted against the end of a 17 mm long foil lined tube.

This model shows the first 3 when smoked under FTC conditions.
Clothes delivered 11.0 mg aerosol. The total amount of aerosol supplied for 9 clothes was 24.9 mg.

Example 10 A smoking article having the shape of the fuel member and the support shown in FIG. 7 was prepared using an annular compressed carbon fuel member having an inner diameter of about 4 mm and an outer diameter of about 8 mm and a length of 15 mm. Fuel is 90% P
Made from CB-G activated carbon and 10% SCMC. The support was a 10 mm long piece made of Union Carbide PC-25 carbon with an outer diameter of about 4 mm. A support filled with 55 mm of a 1: 1 glycerin / propylene glycol mixture was inserted at the end of the fuel near the mouth end of the article. This fuel / support combination was inserted 7 mm into a 70 mm foil lined tube with a short cellulose acetate filter at the mouth end. The length of the article was about 77 mm.

This article delivered a significant amount of aerosol over the service life of the first three garments and fuel components.

Example 11 A modified type of smoking article of FIG. 9 was made as follows: A 4.5 mm diameter and 9.5 mm long carbon fuel source with a 1 mm diameter longitudinal passage was used for 10% SCMC. And 5%
Of potassium carbonate and 85% carbonized paper were extruded from a mixture obtained by mixing with 10% water. This mixture had a dough-like consistency which was fed to the extruder. The extruded material was dried at 80 ° C. overnight and then cut into a predetermined length. A microcapsule was made from a 22 mm long piece made of 0.0089 mm thick aluminum formed into a cylindrical body having an inner diameter of 4.5 mm. In this macrocapsule, (a) 70 mg vermiculite containing 50 mg of a 1: 1 mixture of propylene glycol and glycerin,
And (b) 30 mg Burley tobacco with 6% glycerin and 6% propylene glycol added. The fuel source and the macrocapsule were combined by inserting the fuel source into the end of the macrocapsule by about 2 mm.
A polypropylene tube having an inner diameter of 4.5 mm and a length of 35 mm was inserted into the other end of the macrocapsule. Thus, the fuel source, the macrocapsule and the polypropylene tube were combined to form a piece 65 mm long and 4.5 mm in diameter. The pieces were wrapped with several layers of Maniglass 1000 from Manning Paper Company to reach an outer circumference of 24.7 mm. The unit was then combined with a 5 mm length cellulose acetate filter and wrapped with cigarette paper. When smoked under FTC conditions, this article delivers 8 mg WTPM for the first 3 doses and 7 mg WTPM for 4-6 doses.
And 5 mg of WTPM in 7-9 doses.
The total aerosol dose over 9 doses was 20 mg. When placed horizontally on the tissue paper, the article did not ignite the tissue paper and did not rub.

[Brief description of drawings]

1 to 9 are vertical cross-sectional views of various embodiments according to the present invention, FIG. 1A is a cross-sectional view taken along line 1A-1A of FIG. 1, and FIG. 2A is a tapered modification of FIG. It is a longitudinal cross-sectional view of a fuel member, FIG. 3A is a 3A-3A line cross-sectional view of FIG. 3, and FIG. . 10 ... Fuel member 12 ... Aerosol generating means 14 ... Tube 15 ... Suction port 20 ... Glass ball 22 ... Disc 28 ... Cigarette filling

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor John Hughes Reynolds The Force Winston Ceylem, North Carolina, USA, Puritan Lane 5901 (72) Inventor Michael David Shannon Winston Cey, North Carolina, USA Irem, Ashloon Court 3735 Bee (72) Inventor Chandra Kumar Banerje 4430 (72) Inventor Ernest Gilbert Farrier, Pefham Town, North Carolina U.S.A., Pelham Place 2820 Bee Winston Seille, North Carolina, U.S.A.

Claims (2)

[Claims] 1. A carbonaceous fuel member for smoking articles having a carbon content of at least 80% by weight, having a length of less than 30 mm and having at least one longitudinal passage. 2. (a) Forming a mixture of carbon and an organic binder having a carbon content of at least 80% by weight into a shaped body of a predetermined shape, and then (b) pyrolyzing the shaped body. A method of making a carbonaceous fuel member for smoking articles, comprising converting the binder to carbon.