US20130133675A1 - Smokeless flavor inhalator - Google Patents

Abstract

A smokeless flavor inhalator includes a tobacco material as a flavor generator, and a heater for heating the tobacco material to allow flavor components to be released from the tobacco material while preventing smoke from being generated from the tobacco material. The heater has a carbon heat source and a cooling element. The carbon heat source and the cooling element cooperatively keep the heating temperature of the tobacco material at a temperature of 50 to 200° C.

Description

TECHNICAL FIELD
• The present invention relates to smokeless flavor inhalators capable of releasing flavor without generating aerosol to allow users to inhale and enjoy the released flavor.
BACKGROUND ART
• Smoking articles such as cigarettes and cigars are typical flavor generation products using, as a medium, the smoke (aerosol) produced by the combustion of tobacco leaves to allow users to enjoy the flavor of tobacco through the senses of taste and smell.
• Meanwhile, in recent years, there have been known a variety of substitutes for the smoking articles that allow the user to enjoy the flavor of tobacco. The substitutes for the smoking articles can be roughly classified into two types, non-heating type and heating type. In either type, tobacco leaves are not burned, and thus it is possible to prevent the sidestream smoke or smell of the burned tobacco leaves from affecting the people around the user.
• For example, the non-heating type smoking article substitute disclosed inPatent Document 1 identified below includes a holder provided with an air inlet opening and a mouthpiece, and an air permeable vessel accommodated in the holder. The air permeable vessel is filled with a tobacco material impregnated with the flavor components of tobacco.
• With the smoking article substitute ofPatent Document 1, the user has only to inhale, through the mouthpiece, the air that has passed through the tobacco material, without lighting the tobacco material, to enjoy the flavor of tobacco contained in the air.
• The heating-type substitutes for the smoking articles, on the other hand, can be classified in more detail according to the type of heat source and the method of transferring heat from the heat source to the tobacco material or the flavor generator.
• Specifically, the smoking article substitutes disclosed inPatent Documents 2 to 6 use a carbon heat source. The carbon heat source heats air by utilizing the heat of combustion thereof, to produce a high-temperature gas flow for heating the tobacco material or the flavor generator. In the heating-type smoking article substitutes, the flavor components of tobacco are vaporized and released invariably by heating the tobacco material or the flavor generator.
• The smoking article substitutes disclosed inPatent Documents 7 and 8 also use a carbon heat source. In these substitutes, heat generated by the combustion of the carbon heat source is transferred to the tobacco material or the flavor generator to heat same.
• The smoking article substitutes disclosed in Patent Documents 9 to 13 use a liquid or gas fuel as the heat source.
• Specifically, in the smoking article substitute of Patent Document 9, a liquid fuel is burned with the aid of a catalyst, and the tobacco material or the flavor generator is heated by a high-temperature gas flow created by the combustion heat of the liquid fuel.
• The smoking article substitute ofPatent Document 10 is equipped with a micro gas burner as an attachment, which is used to heat a cigarette.
• In the smoking article substitutes ofPatent Documents 10 to 12, butane gas is burned with the aid of a catalyst, and heat generated by the combustion of the gas is transferred to the tobacco material or the flavor generator to heat same.
• The smoking article substitute of Patent Document 13 is provided with a heat sink, which stores heat therein as it is heated by the flame of a gas lighter (external heat source). The heat stored in the heat sink is transferred through a heat pipe to a volatile component (flavor generator) to heat same.
• The smoking article substitutes disclosed inPatent Documents 14 to 17 are provided with a heat source utilizing the heat of chemical reaction. Specifically, in the smoking article substitutes ofPatent Documents 14 and 15, the heat source generates heat by utilizing an exothermic reaction between two chemicals (e.g., quicklime and water), to heat the tobacco material or the flavor generator. In the smoking article substitutes ofPatent Documents 16 and 17, the heat source generates heat by utilizing the heat of oxidation reaction of metal, to heat the tobacco material or the flavor generator.
• The smoking article substitutes disclosed inPatent Documents 18 to 21 are all provided with a heat source utilizing electrical energy. Namely, the heat source converts electrical energy to heat energy, which is used to heat the tobacco material or the flavor generator.
• With regard to the smoking article substitute disclosed in Patent Document 22, additives to be added to the tobacco material and heating conditions for heating the additives are defined with a view to heightening the flavor component releasing effect.
PRIOR ART LITERATURE
• Patent Document 1: JP H02-2331 A1
• Patent Document 2: JP S63-35468 A1
• Patent Document 3: JP H06-46818 A1
• Patent Document 4: JP H03-45658 B1
• Patent Document 5: JP 3012253 B1
• Patent Document 6: JP H02-84164 A1
• Patent Document 7: JP 3013914 B1
• Patent Document 8: WO 2009/22232
• Patent Document 9: WO 2008/113420
• Patent Document 10: JP 2006-504065 A1
• Patent Document 11: WO 2007/12007
• Patent Document 12: WO 2009/79641
• Patent Document 13: JP 2008-35742 A1
• Patent Document 14: U.S. Pat. No. 4,892,109 B1
• Patent Document 15: JP H02-190171 A1
• Patent Document 16: JP H06-114105 A1
• Patent Document 17: WO 2009/92862
• Patent Document 18: U.S. Pat. No. 5,144,962 B1
• Patent Document 19: U.S. Pat. No. 5,060,671 B1
• Patent Document 20: WO 2004/80216
• Patent Document 21: JP 2006-525798 A1
• Patent Document 22: JP S62-501050 A1
DISCLOSURE OF THE INVENTIONProblems to be Solved by the Invention
• In the case of the smoking article substitute ofPatent Document 1, no smoke is produced from the tobacco material, but the amount of the flavor components released from the tobacco material is small, so that the user will not be completely satisfied with the flavor derived from the tobacco material.
• In this connection, in the smoking article substitutes ofPatent Documents 2 to 21, the tobacco material or the flavor generator is heated, thus allowing a large amount of flavor components to be released from the tobacco material or the flavor generator, compared with the smoking article substitute ofPatent Document 1. It is therefore thought that the user will be able to enjoy the flavor to an extent equivalent to that to which the user senses when smoking an ordinary filter cigarette. Since the heating of the tobacco material or the flavor generator is accompanied by the generation of aerosol, however, the smoking article substitutes ofPatent Documents 2 to 21 are not perfectly smokeless.
• On the other hand, the smoking article substitute of Patent Document 22 is smokeless and at the same time is capable of releasing an increased amount of flavor components. In the case of the smoking article substitute of Patent Document 22, however, it is necessary that a large amount of water should be contained in the tobacco material. Specifically, the water content needs to be 0.25 to 7 g, preferably, 1 to 5 g per gram of the tobacco material.
• In the case of ordinary filter cigarettes, the water content per gram of the tobacco material is 0.1 to 0.15 g, and even in snuff having a relatively high water content such as snus, the upper-limit water content per gram of the tobacco material is 0.5 g or thereabout from the standpoint of preservative quality. In view of this, the smoking article substitute of Patent Document 22 is not suitable for commercial realization from the standpoint of the preservative quality of the tobacco material.
• Aside from the preservative quality, the water content of the tobacco material decreases due to the heating of the tobacco material. Thus, as the user repeatedly inhales, the amount of the flavor components released from the tobacco material varies, which brings a feeling of strangeness to the user.
• An object of the present invention is to provide a smokeless flavor inhalator permitting compatibility between smokelessness and strengthening of flavor and also capable of stabilizing the amount of flavor components released each time the user inhales through the flavor inhalator.
Means for Solving the Problems
• To achieve the above object, the present invention provides a smokeless flavor inhalator comprising: a casing having a mouthpiece, the casing being configured to generate a flow of air guided therethrough toward the mouthpiece when a user inhales through the mouthpiece; a flavor generator arranged inside the casing and capable of releasing a flavor component into the air flow; and a heater for keeping the flavor generator heated at a heating temperature of 50 to 200° C., to allow the flavor component to be released while preventing generation of aerosol from the flavor generator, wherein the heater includes a carbon heat source having air permeability and attached to a distal end of the casing for heating the air, and an incombustible cooling element having air permeability and arranged inside the casing and between the carbon heat source and the flavor generator for cooling the air heated by the carbon heat source.
• In the above smokeless flavor inhalator, the heater keeps the heating temperature of the flavor generator at a temperature of 50 to 200° C. Accordingly, when the user inhales through the flavor inhalator, the flavor generator releases the flavor component into the air flow guided toward the mouthpiece, without generating any aerosol (smoke). The flavor inhalator is therefore not only smokeless but is capable of delivering the flavor component into the user's mouth.
• Preferably, the cooling element has a plurality of through holes formed therethrough, and the through holes provide the cooling element with a heat exchange area of 500 mm²or more. The presence of the cooling element serves to shorten the distance required between the carbon heat source and the flavor generator, making it possible to reduce the length of the flavor inhalator.
• More detailed and preferred constructions of the present invention will become apparent from the following description of the embodiments and modifications taken in conjunction with the accompanying drawings.
Advantageous Effects of the Invention
• The smokeless flavor inhalator of the present invention permits flavor components to be effectively released from the flavor generator without an aerosol being generated from the flavor generator, whereby the flavor components of the flavor generator can be adequately delivered into the user's mouth.
BRIEF DESCRIPTION OF THE DRAWINGS
• FIG. 1 is a longitudinal sectional view of a smokeless flavor inhalator according to a first embodiment.
• FIG. 2 exemplifies an end face of a carbon heat source.
• FIG. 3 exemplifies another end face of the carbon heat source.
• FIG. 4 exemplifies still another end face of the carbon heat source.
• FIG. 5 is a longitudinal sectional view of a heat source holder according to modification 1(1) of the first embodiment.
• FIG. 6 is a longitudinal sectional view of a flavor inhalator according to modification 1(2) of the first embodiment.
• FIG. 7 is a longitudinal sectional view of a smokeless flavor inhalator according to a second embodiment.
• FIG. 8 is a longitudinal sectional view of a smokeless flavor inhalator according to a third embodiment.
• FIG. 9 is a longitudinal sectional view of a flavor inhalator according to modification 3(1) of the third embodiment.
• FIG. 10 is a longitudinal sectional view of a flavor inhalator according to modification 3(2) of the third embodiment.
• FIG. 11 is a longitudinal sectional view of a smokeless flavor inhalator according to a fourth embodiment.
• FIG. 12 schematically illustrates a first testing device.
• FIG. 13 schematically illustrates a second testing device.
• FIG. 14 schematically illustrates a third testing device.
• FIG. 15 is an end view of a carbon heat source used in the third testing device.
• FIG. 16 is a perspective view of the carbon heat source ofFIG. 15.
• FIG. 17 is a graph showing test results obtained using the third testing device.
• FIG. 18 schematically illustrates a fourth testing device.
• FIG. 19 is an end view of a cooling element used in the fourth testing device.
• FIG. 20 is an end view of another cooling element used in the fourth testing device.
• FIG. 21 is a graph showing test results obtained using the fourth testing device.
• FIG. 22 is a graph showing the relations between heat exchange areas and outlet temperatures of the cooling element.
BEST MODE FOR CARRYING OUT THE INVENTION
• A smokeless flavor inhalator according to a first embodiment, illustrated inFIG. 1, is categorized as Carbon Combustion+High-temperature Gas Heating+Cooling type and is shaped like a rod as a whole.
• Carbon Heat Source:
• The inhalator ofFIG. 1 has acarbon heat source10 at a distal end thereof. In the following, thecarbon heat source10 will be described in detail.
• Thecarbon heat source10 is cylindrical in shape and is obtained by molding a mixture of high-purity carbon particles, an incombustible additive, an organic or inorganic binder, and water into shape. Specifically, thecarbon heat source10 has a carbon ratio of 10 to 99 weight % or a carbon content of 1 to 120 mg/mm.
• The high-purity carbon particles are obtained, for example, by heating carbon at a high temperature of 750° C. or more for 5 minutes or more in an inert gas atmosphere. This heating process removes volatile components, which are impurities contained in carbon particles. As a result, odor emitted from the carbon particles is lessened.
• For the incombustible additive, carbonates or oxides of sodium, potassium, calcium, magnesium and silicon may be used. The incombustible additive accounts for 40 to 89 weight % of thecarbon heat source10. Preferably, calcium carbonate is used as the incombustible additive. The incombustible additive is optional and may be omitted.
• The organic binder is one, or a mixture of two or more, of alginates, CMC, EVA, PVA, PVAC and sugars, and accounts for 1 to 10 weight % of thecarbon heat source10. A preferred organic binder is ammonium alginate.
• For the inorganic binder, on the other hand, mineral-based binders, such as refined bentonite, or silica-based binders, such as colloidal silica, water glass and calcium silicate, may be used. The inorganic binder accounts for 5 to 20 weight % of thecarbon heat source10.
• The inorganic binder is superior to the organic binder in that the former emits no smoke when thecarbon heat source10 is burned. Where the organic binder is used, thecarbon heat source10 is preferably obtained by a carbonizing-and-baking process. The carbonizing-and-baking process removes the organic binder from thecarbon heat source10, and therefore, thecarbon heat source10 does not emit odor when burned. The carbonizing-and-baking process is described in detail in, for example, JP 3024703 B1.
• Thecarbon heat source10 has at least one throughhole12 extending in an axial direction thereof.FIGS. 2 to 4 each illustrate an exemplary concrete shape of an end face of thecarbon heat source1. As clearly shown inFIGS. 2 to 4, adjacent ones of the throughholes12 are set apart from each other by a partition wall. In this case, the partition wall has a thickness of 0.1 to 0.5 mm.
• Heat Source Holder:
• Thecarbon heat source10 is attached to a distal end of aheat source holder14. In the following, theheat source holder14 will be described in detail.
• Theheat source holder14 has heat resistance and is tubular in shape. Preferably, theheat source holder14 holds thecarbon heat source10 in such a manner that a predetermined length of thecarbon heat source10 projects from the distal end of theheat source holder14.
• Theheat source holder14 has a peripheral wall with a laminated structure, for example. Specifically, the peripheral wall is constituted by a single laminate including a metal layer and a paper layer bonded together, or by a plurality of such laminates superposed one upon the other in a radial direction of theheat source holder14. An inner surface of the peripheral wall has to be constituted by the metal layer. The metal layer is made of an aluminum alloy, for example, and the total thickness of the metal layers included in the peripheral wall is preferably larger than or equal to 30 μm. The paper layer may be obtained from wrapper paper used for cigarettes, tip paper used for filter-tipped cigarettes, or other paper material such as ordinary paper, incombustible paper and flame-resistant paper.
• The metal layer has excellent heat conductivity. Accordingly, when thecarbon heat source10 is burned and thus the paper layer is heated by the heat from thecarbon heat source10, the metal layer keeps the heating temperature of the paper layer lower than the burning temperature of the paper layer. The emission of odor due to scorching of the paper layer can therefore be suppressed.
• Instead of the peripheral wall with the aforementioned laminated structure, theheat source holder14 may have a peripheral wall made of an incombustible material, or a composite peripheral wall including a wall section constituted by the aforementioned peripheral wall with the laminated structure and a wall section made of an incombustible material. For the incombustible material, one of inorganic materials including ceramics, meerschaums, glass and metals or a mixture of two or more of the inorganic materials may be used.
• Cooling Section:
• Theheat source holder14 accommodates acooling element16. Thecooling element16 has air permeability and heat resistance and is located adjacent to thecarbon heat source10. In the following, thecooling element16 will be described in detail.
• Thecooling element16 is made of an inorganic material such as ceramics, meerschaums, glass, metals and calcium carbonate, hydrates, or water absorptive polymers. Specifically, thecooling element16 has a honeycomb structure, a foamed structure or a packing structure, the packing structure being obtained by packing pellets or a granular or fibrous material into a mold. More specifically, thecooling element16 includes internal passages. These internal passages have a total inner surface or a heat exchange area of 500 mm²or more. Preferably, thecooling element16 contains the inorganic material of 90 to 95 wt %.
• Thecooling element16 may alternatively have a composite structure including two or more different structures selected from the above structures, and the different structures may be juxtaposed so as to be closely adjacent to each other or with a space therebetween in the axial direction of theheat source holder14. Thecooling element16 may contain water, an aromatic, an extraction liquid of tobacco components, and the like.
• Material Holder:
• Amaterial holder18 is coupled to the proximal end of theheat source holder14. Thematerial holder18 has heat resistance and is tubular in shape. Thematerial holder18 is made of paper, metal or synthetic resin, or is farmed using the laminated structure of the aforementioned laminates.
• Tobacco Material:
• Atobacco material20, as a flavor generator, is contained in thematerial holder18. Thetobacco material20 may be ordinary shredded tobacco used for cigarettes, granular tobacco used for snuff, rolled tobacco, or molded tobacco. The rolled tobacco is obtained by forming a sheet of reconstituted tobacco into a roll and has channels therein. The molded tobacco is obtained by molding granular tobacco into shape.
• Thetobacco material20 may be admixed with a flavor-developing aid. The flavor-developing aid contains at least one of carbonates, hydrogen carbonates, oxides and hydroxides of alkali metals and/or alkaline-earth metals. A preferred flavor-developing aid is potassium carbonate. Thetobacco material20 may further contain a desired aromatic or aromatics.
• Specifically, thetobacco material20 is 5 to 30 mm in length and has a resistance of 10 to 120 mmAq to draw. It is to be noted here that thetobacco material20 has a water content equivalent to that of shredded tobacco used in ordinary cigarettes, that is, a water content of 10 to 20 weight %.
• In this embodiment, thetobacco material20 is held between front andrear stoppers22fand22rto be kept within thematerial holder18. Each of thestoppers22fand22ris shaped like a disk and has air permeability. Specifically, thestoppers22fand22rare fitted into respective opposite ends of thematerial holder18 and are each made of a filter material such as acetate and paper, or a membrane material such as nonwoven fabric, or formed using an inorganic molded piece having air permeability.
• Mouthpiece:
• Amouthpiece24 is connected to a rear end of thematerial holder18. Themouthpiece24 includes atubular filter holder26. Thefilter holder26 is made of paper or a synthetic resin and has a rear end forming a mouthpiece.
• Afilter28 is accommodated in thefilter holder26. Thefilter28 is in the form of a solid cylinder and is made of acetate fibers, paper or the like. Acetate fibers and paper have the property of not readily adsorbing the flavor components of thetobacco material20. Thefilter28 may have at least one through hole axially extending therethrough. Further, thefilter28 may be a combination of different kinds of filter materials, like dual filters and the like for cigarettes.
• To use the flavor inhalator of the first embodiment, the user first lights thecarbon heat source10 of the flavor inhalator and then inhales with themouthpiece24 held in his/her mouth. The inhalation creates a flow of air from the outside of the flavor inhalator into the user's mouth cavity through the throughholes12 of thecarbon heat source10, thecooling element16 in theheat source holder14, thefront stopper22f, thetobacco material20, therear stopper22r, thefilter28 and themouthpiece24.
• While passing through the throughholes12 in thecarbon heat source10, the air flow is heated by the combustion heat of thecarbon heat source10. Accordingly, the air flow just left thecarbon heat source10 forms a high-temperature gas flow.
• The high-temperature gas flow is cooled in some degree while passing through thecooling element16, thus turning to a heated gas flow. The heated gas flow heats thetobacco material20 when passing through thetobacco material20, but the heating of thetobacco material20 by the heated gas flow does not lead to burning of thetobacco material20 or generation of aerosol (smoke) from thetobacco material20.
• Specifically, the heating temperature of thetobacco material20 is kept within a temperature range of 50 to 200° C. This temperature range is higher than an ambient temperature (concretely, 5 to 35° C.) at which the flavor inhalator is used, but is sufficiently lower than the heating temperature of thecarbon heat source10. Namely, thecooling element16 has the function of lessening the amount of heat transferred from thecarbon heat source10 to thetobacco material20.
• Where the heating temperature of thetobacco material20 is kept within the above temperature range, liquid contained in thetobacco material20, such as water, is not aerosolized and the flavor components of thetobacco material20 are satisfactorily released into the heated gas flow passing through thetobacco material20. Moreover, the aforementioned flavor-developing aid promotes the release of the flavor components from thetobacco material20 into the heated gas flow; on the other hand, the amount of the flavor components adsorbed by thefilter28 of themouthpiece24 is small.
• Consequently, the flavor inhalator allows the heated gas flow containing a large amount of the flavor components of thetobacco material20 to be delivered into the user's mouth cavity without generating an aerosol, so that the user can fully enjoy the flavor of thetobacco material20.
• When thecarbon heat source10 is burned, the generation of smoke from thecarbon heat source10 is minimized as stated above, and therefore, thecarbon heat source10 also does not constitute a source of aerosol (smoke).
• The term “smokeless” used herein means that the aerosol generated from the flavor inhalator during use has a concentration of 1.0×10⁵particles/cc or less. Aerosol with such a concentration is substantially invisible and the concentration is virtually unmeasurable because of the influence of the background of ambient air.
• The water content of thetobacco material20 is equivalent to that of shredded tobacco contained in ordinary cigarettes. Accordingly, although thetobacco material20 is heated to a temperature falling within the aforementioned temperature range and its water content varies as a result, the amount of the flavor components in the heated gas flow inhaled per puff of the user is almost constant. As a result, the user can enjoy the flavor of thetobacco material20 reliably and stably even if he/she repeatedly puffs.
• Where an aromatic or aromatics different from the tobacco-specific flavor components are contained in thetobacco material20, the user can of course enjoy the aromatic or aromatics at the same time.
• In the first embodiment described above, theheat source holder14, thematerial holder18 and thefilter holder26 constitute a casing of the flavor inhalator. Of theseholders14,18 and26 connected to one another, at lease two of the holders may be formed as a one-piece body, or adjacent ones of the holders may be previously connected to each other by tip paper or the like. Further, the holders may be detachably connected to one another.
• The present invention is not limited to the aforementioned first embodiment and may be modified in various ways.
• In the following, various modifications and other embodiments will be described in order. In the following description, identical reference signs are used to denote members or sections having functions identical with those of the members or sections already explained above, and description of such members and sections is omitted for brevity's sake. The following description is focused on the differences.
• FIG. 5 illustrates modification 1(1) of the flavor inhalator of the first embodiment.
• In modification 1(1), as is clear fromFIG. 5, aheat insulator30 is arranged between thecarbon heat source10 and theheat source holder14. Theheat insulator30 is tubular in shape and is made of an inorganic material such as inorganic fibers, or formed using an inorganic molded piece, for example.
• Theheat insulator30 reduces the transfer of heat from thecarbon heat source10 to theheat source holder14 and prevents the generation of smoke due to scorching of theheat source holder14. Also, theheat insulator30 may be so arranged as to surround the entire outer periphery of thecarbon heat source10. In this case, smoke, if produced in a small amount due to the combustion of thecarbon heat source10, is dispersed within theheat insulator30 and does not become visible.
• FIG. 6 illustrates modification 1(2) of the smokeless flavor inhalator of the first embodiment.
• In modification 1(2), the flavor inhalator has a plurality of air inlet holes32 formed in at least one of theheat source holder14, thematerial holder18 and thefilter holder26. The air inlet holes32 are located downstream of thecarbon heat source10 and are arranged at intervals in the circumferential direction of the corresponding holder. Specifically, in modification 1(2) illustrated inFIG. 6, the air inlet holes32 are formed in each of theheat source holder14, thematerial holder18 and thefilter holder26.
• When the user inhales through themouthpiece24 of the flavor inhalator ofFIG. 6, outside air flows into the corresponding holder through the air inlet holes32. This inflow of air reduces the flow rate of the aforementioned high-temperature gas flow or heated gas flow, and the air thus introduced mixes with the high-temperature gas flow or the heated gas flow, lowering the temperature of the high-temperature gas flow or the heated gas flow. That is, the air introduced through the air inlet holes32 adds to the cooling function of thecooling element16 and is very effective in keeping the heating temperature of thetobacco material20 within the aforementioned temperature range.
• FIG. 7 illustrates a smokeless flavor inhalator according to a second embodiment.
• Specifically, the flavor inhalator ofFIG. 7 is categorized as Carbon Combustion+High-temperature Gas/Thermal Conduction Heating+Cooling type.
• The flavor inhalator of the second embodiment is provided with aheat conduction holder50. Theheat conduction holder50 not only serves as both of theheat source holder14 and thematerial holder18 but has the function of transferring the heat of thecarbon heat source10 to thetobacco material20. Accordingly, theheat conduction holder50 is made of a highly heat-conductive material.
• In the second embodiment, even while the supply of the heated gas flow from thecarbon heat source10 to thetobacco material20 is stopped between a user's puff and another, theheat conduction holder50 allows heat to be transferred from thecarbon heat source10 to thetobacco material20. Thus, even during the period between a user's puff and another, thetobacco material20 is continuously heated to emit the flavor components having a rich taste and aroma.
• FIG. 8 illustrates a smokeless flavor inhalator according to a third embodiment. This flavor inhalator is categorized as Carbon Combustion+Thermal Conduction Heating type.
• The flavor inhalator of the third embodiment is also provided with theheat conduction holder50 but uses anincombustible element52, in place of thecooling element16 and thefront stopper22f.
• Theincombustible element52 has air impermeability and heat resistance. Specifically, theincombustible element52 is constituted by a filler of inorganic fibers or an inorganic molded piece and, as clearly shown inFIG. 8, is interposed between thecarbon heat source10 and thetobacco material20 within theheat conduction holder50.
• Since theincombustible element52 is impermeable to air, theheat conduction holder50 has a plurality of air inlet holes32 formed in the outer periphery thereof.
• In the flavor inhalator of the third embodiment, heat generated by the combustion of thecarbon heat source10 is transferred to thetobacco material20 only through theheat conduction holder50, and thetobacco material20 is heated to a temperature within the aforementioned temperature range only by the thus-transferred heat. That is, theheat conduction holder50 performs a function similar to that of theaforementioned cooling element16. In this case, it is unlikely that the user will inhale the combustion gas produced by the combustion of thecarbon heat source10.
• In the third embodiment, thecarbon heat source10 need not have air permeability. Where the carbon heat source used is impermeable to air, theincombustible element52 may have air permeability. Thus, in the case of the third embodiment, either thecarbon heat source10 or theincombustible element52 has only to be impermeable to air, in order to prevent the combustion gas from flowing into thetobacco material20.
• Also, where air permeability is imparted to thecarbon heat source10, thecarbon heat source10 preferably has a circular cross section, as illustrated inFIG. 2 or3. Thecarbon heat source10 illustrated inFIG. 2 or3 has a large effective heat transfer area with respect to the inner peripheral surface of theheat conduction holder50, compared with thecarbon heat source10 shown inFIG. 4.
• FIG. 9 illustrates modification 3(1) of the flavor inhalator of the third embodiment.
• In modification 3(1), the flavor inhalator is provided with aheat conduction rod54, in place of theheat conduction holder50. Theheat conduction rod54 extends through thecarbon heat source10, theincombustible element52 and thetobacco material20 in their center and has an outer end projecting from thecarbon heat source10 and an inner end disposed in contact with therear stopper22r. In the case of modification 3(1), therefore, thecarbon heat source10, theincombustible element52 and thetobacco material section20 are each tubular or annular in shape.
• Theheat conduction rod54 is made of a metal having high heat conductivity, for example, an aluminum alloy, and is a solid member or a hollow member with at least one end closed. Compared with the solid heat conduction rod, the hollowheat conduction rod54 has small heat capacity and thus is capable of satisfactorily and quickly conducting heat from thecarbon heat source10 to thetobacco material20. Theheat conduction rod54 may, in this case, have an outer diameter of 1 to 5 mm, and the length of thetobacco material section20 may be 5 to 50 mm.
• FIG. 10 illustrates modification 3(2) of the flavor inhalator of the third embodiment.
• In modification 3(2), a heat conduction pipe56 is arranged inside the hollowcarbon heat source10 coaxially therewith. The heat conduction pipe56 serves as both of thematerial holder18 and theheat conduction rod54.
• Specifically, the heat conduction pipe56 has an air inlet opening located at a distal end face of thecarbon heat source10, and thefront stopper22fis fitted into the distal end portion of the heat conduction pipe56. A gap of 5 mm or more is provided between thefront stopper22fand the air inlet opening. The gap serves to reliably prevent thetobacco material20 from burning when thecarbon heat source10 is lighted.
• Thecarbon heat source10 is surrounded by anouter heat insulator58. Theouter heat insulator58 is in the form of a thin pipe and has air permeability, that is, breathability. Theouter heat insulator58 serves to reduce the radiation of heat from thecarbon heat source10, thereby making it possible to keep the amount of heat necessary for sustaining the combustion of thecarbon heat source10, and thus is very effective in securing combustion sustention of thecarbon heat source10.
• In cases where the heat conduction pipe56 has such high heat conductivity that thetobacco material20 may possibly be heated to a temperature above the aforementioned temperature range, an insulator in the form of a thin pipe (not shown) is arranged between thecarbon heat source10 and the heat conduction pipe56, and/or between the heat conduction pipe56 and thetobacco material20. The heat conduction pipe56 has an outer diameter of 3 to 8 mm and an inner diameter of 2 to 7 mm.
• FIG. 11 illustrates a smokeless flavor inhalator according to a fourth embodiment. This flavor inhalator is categorized as Carbon Combustion+Air Heating type.
• In the fourth embodiment, thecarbon heat source10 has anair inlet hole60 formed in the center thereof. Theair inlet hole60 axially penetrates through thecarbon heat source10.
• Further, thecarbon heat source10 has a heat-resistant coating62 covering the entire inner surface of theair inlet hole60. The heat-resistant coating62 may be made of clay, or a metal oxide such as iron oxide, alumina, titania, silica, silica-alumina, zirconia and zeolite, or a mixture of clay and two or more of the mentioned metal oxides.
• Further, theincombustible element52 has a throughhole64 formed in the center thereof and connected to theair inlet hole60. As is clear fromFIG. 11, theincombustible element52 has an extension surrounding the rear end portion of thecarbon heat source10. In this case, theincombustible element52 serves also as theheat source holder14. InFIG. 11, the reference sign L₁represents a projection length of thecarbon heat source10 projecting from theincombustible element52, and the reference sign L₂represents an overlap length (length of the extension) of theincombustible element52 overlapping with thecarbon heat source10.
• With the flavor inhalator of the fourth embodiment, when the user inhales through themouthpiece24 after lighting thecarbon heat source10, air flows into thetobacco material20 through theair inlet hole60 of thecarbon heat source10 and the throughhole64 of theincombustible element52, and the air is heated to a temperature within the aforementioned temperature range in the process of passing through thecarbon heat source10. Thus, the flavor inhalator of this embodiment also permits the flavor components of thetobacco material20 to be adequately delivered into the user's mouth cavity without generating an aerosol.
• As will be clear from the above, the smokeless flavor inhalator of the present invention requires that thetobacco material20 be heated to a temperature of 50° C. to 200° C. while the inhalator is in use. For the purpose of verification, a first testing device shown inFIG. 12 was prepared.
• The first testing device is provided with a heatresistant tube100 accommodating thetobacco material20, and aheater102 surrounding thetube100 and capable of heating thetube100, namely, thetobacco material20, up to 22° C. or 50° C. Thetobacco material20 subjected to the test contained 230 mg of tobacco particles made from Burley tobacco leaves and 14 mg of potassium carbonate. The tobacco particles had a particle diameter of 0.5 to 1.18 mm.
• The first testing device is further provided with asuction source104, which is connected to thetube100 through animpinger106. Thesuction source104 is configured to draw in air or a gas from thetube100 through theimpinger106 at a flow rate of 55 ml/2 sec (corresponding to one puff).
• With thetobacco material20 heated to 22° C., the suction gas was drawn to thesuction source104 while being allowed to bubble in theimpinger106 so that a flavor component (nicotine) of the tobacco material contained in the suction gas might be collected in theimpinger106. As a result, it was found that the amount of the collected flavor component was 0.7 μg/puff.
• Further, with thetobacco material20 heated to 50° C., the flavor component was collected in theimpinger106 in the same manner, and it was found that the amount of the collected flavor component was 9.0 μg/puff.
• The above two test results reveal that when thetobacco material20 is heated to a temperature of 50° C., the amount of the flavor component released is more than one digit larger than when thetobacco material20 is heated to 20° C. This proves that thetobacco material20 needs to be heated to 50° C. or higher in order to deliver an adequate amount of the flavor component into the user's mouth.
• FIG. 13 illustrates a second testing device.
• The second testing device is provided with a heatresistant tube108 accommodating thetobacco material20. Thetobacco material20 subjected to the test contained 35 mg of tobacco particles made from Burley tobacco leaves, and the tobacco particles had a particle diameter of 0.5 to 1.18 mm.
• Thetube108 is connected through atransparent case110 and a mass-flow controller112 to asuction pump114, which is capable of drawing in air from thetube108 at a flow rate of 1,650 ml/min.
• Suction of air by means of thesuction pump114 at the mentioned flow rate was repeated while gradually raising the temperature of the air flowing into thetube108, and as a result, it was confirmed that no aerosol (smoke) was observed inside thetransparent case110 insofar as the temperature of the air, that is, the temperature of thetobacco material20, was 200° C. or less. This guarantees that no smoke is generated from thetobacco material20 as long as the heating temperature of thetobacco material20 is kept at 200° C. or lower.
• Further, in the smokeless flavor inhalator of the present invention, thecooling element16 needs to have the heat exchange area of 500 mm², as stated above. For the purpose of verification, a third testing device illustrated inFIG. 14 was prepared.
• The third testing device is provided with atube116 made of heat resistant paper. Thetube116 has a hollow cylindricalcarbon heat source10aattached to a distal end thereof. Thecarbon heat source10asubjected to the test was obtained by extrusion molding and contained 80 weight % of active carbon, 15 weight % of calcium carbonate, and 5 weight % of carboxymethylcellulose (CMC). Specifically, as illustrated inFIGS. 15 and 16, thecarbon heat source10ahad an inner diameter of 3 mm, an outer diameter of 6.8 mm, and a length of 10 mm.
• The proximal end of thetube116 is connected to a suction source (not shown), and the suction source is configured to draw in air from thetube116 at a flow rate of 55 ml/2 sec (corresponding to one puff) at intervals of 30 seconds. Further, thetube116 has five temperature sensors (not shown) attached thereto. The temperature sensors are located at distances of 5 mm, 10 mm, 15 mm, 20 mm and 50 mm from thecarbon heat source10a, respectively, and are each capable of measuring the temperature in thetube116.
• While the suction of air by means of the suction source was repeated with thecarbon heat source10 lighted, the temperatures in thetube116 were measured by the respective temperature sensors. The measurement results are shown inFIG. 17.
• As is clear fromFIG. 17, the temperature in thetube116 shows a tendency to lower with increasing distance from thecarbon heat source10a, and in order for the temperature in thetube116 to drop to 200° C. or less, a distance of 50 mm or more from thecarbon heat source10ais needed.
• In other words, in the case of the third testing device not including thecooling element16, a distance of 50 mm or more needs to be secured between thecarbon heat source10aand thetobacco material20 in order to restrict the heating temperature of thetobacco material20 to a temperature not higher than 200° C., at and below which generation of smoke (aerosol) from thetobacco material20 can be avoided.
• Thus, where the smokeless flavor inhalator does not include thecooling element16, a distance of 50 mm or more needs to be provided between thecarbon heat source10aand thetobacco material20. Such a flavor inhalator is, however, extraordinarily long and is not practical.
• FIG. 18 illustrates a fourth testing device prepared for verifying the function of thecooling element16.
• Compared with the third testing device, the fourth testing device includes thecooling element16 having air permeability as well as heat resistance and arranged inside thetube116 in a position adjacent to thecarbon heat source10a. The temperature sensor is arranged only at the outlet end (downstream end) of thecooling element16 to measure the temperature in thetube116 at the outlet of thecooling element16.
• For use with the fourth testing device, multiple pieces ofcylindrical cooling elements16aand16b, illustrated inFIGS. 19 and 20, respectively, were prepared. Thecooling elements16aand16bwere each obtained by extrusion molding and contained 95 weight % of calcium carbonate and 5 weight % of carboxymethylcellulose (CMC).
• Thecooling elements16aand16bare identical in outer diameter (6.5 mm) but are different in the opening area of their internal passages. Specifically, thecooling element16ahad an opening area of 17.2 mm²obtained, for example, by 52 through holes each with a square (0.57 mm×0.57 mm) cross-section. In this case, the total length of the inner perimeters of all through holes is 120 mm.
• On the other hand, thecooling element16bhad an opening area of 24.1 mm²obtained, for example, by 21 through holes each with a square (1.23 mm×1.23 mm) cross-section. In this case, the total length of the inner perimeters of all through holes is 90.9 mm.
• Since the heat exchange areas of thecooling elements16aand16bare each given by: inner perimeter x length, thecooling elements16aand16bwith different lengths were prepared.
• With onecooling element16aset in the fourth testing device, a suction test was conducted in the same manner as that performed using the third testing device, and the suction test was repeated with respect to all coolingelements16awith different lengths. Similarly, each of thecooling elements16bwith different lengths was subjected to the suction test.
• FIGS. 21 and 22 show the test results. As is clear fromFIG. 21, the greater the length, the lower the outlet temperature of thecooling element16 becomes, regardless of whether the cooling element tested is thecooling element16aor thecooling element16b.
• With regard to the heat exchange areas of thecooling elements16aand16b, the test results indicate that a heat exchange area of 500 mm²is needed in order to keep the outlet temperature of thecooling element16, that is, the heating temperature of thetobacco material20, at 200° C. or below. In the case of thecooling element16a, a heat exchange area of 500.4 mm²(=120 mm×4.17 mm) or more can be ensured if thecooling element16ahas a length of 4.17 mm or more. In the case of thecooling element16b, on the other hand, a heat exchange area of 500.5 mm²(=91 mm×5.5 mm) or more can be ensured if thecooling element16bhas a length of 5.5 mm or more.
• Thus, by including thecooling element16aor16bin the smokeless flavor inhalator, it is possible to significantly shorten the distance (length of thecooling element16aor16b) needed between thecarbon heat source10 and thetobacco material20, so that the overall length of the smokeless flavor inhalator can be reduced to a practical level.
• Thecooling element16aor16blocated between thecarbon heat source10 and thetobacco material20 need not be disposed in direct contact with thecarbon heat source10 or thetobacco material20. A predetermined space may be provided between thecarbon heat source10 and thecooling element16aor16b, or between the coolingelement16aor16band thetobacco material20.
• The presence of thecooling element16aor16bmakes it unnecessary to introduce outside air to the upstream side of thetobacco material20, that is, into the region between thecarbon heat source10 and thetobacco material20, in order to keep the heating temperature of thetobacco material20 at a temperature not higher than 200° C., and also prevents the ignition performance of thecarbon heat source10 from being deteriorated due to the inflow of the outside air. Specifically, the introduction of outside air leads to reduction in the amount of the outside air passing through thecarbon heat source10 when thecarbon heat source10 is lighted, deteriorating the ignition performance of thecarbon heat source10.
• The present invention is not limited to the embodiments and modifications described above and may be modified in various other ways.
• For example, the flavor generator is not limited to the aforementioned tobacco material and may be a liquid or solid aromatic, other than the flavor components of the tobacco material, carried on a base material of cellulose or the like. Also, the flavor inhalator of the present invention may be implemented by optionally combining the elements in the aforementioned embodiments and modifications with commonly known means without departing from the purpose of the invention.
EXPLANATION OF REFERENCE SIGNS
• • 10 carbon heat source
  • 12 through hole (flow path)
  • 14 heat source holder (casing)
  • 16 cooling element
  • 18 material holder
  • 20 tobacco material (flavor generator)
  • 24 mouthpiece
  • 28 filter
  • 30 heat insulator
  • 32 air inlet hole (flow path)
  • 50 heat conduction holder (casing)
  • 52 incombustible element
  • 54 heat conduction rod
  • 56 heat conduction pipe
  • 60 air inlet hole (flow path)

Claims (5)

1. A smokeless flavor inhalator comprising:

a casing having a mouthpiece, said casing being configured to generate a flow of air guided therethrough toward the mouthpiece when a user inhales through the mouthpiece;

a flavor generator arranged inside said casing and capable of releasing a flavor component into the air flow; and

a heater for keeping said flavor generator heated at a heating temperature of 50 to 200° C., to allow the flavor component to be released while preventing generation of aerosol from said flavor generator,

wherein said heater includes:

a carbon heat source having air permeability and attached to a distal end of said casing for heating the air, and

an incombustible cooling element having air permeability and arranged inside said casing and between the carbon heat source and said flavor generator for cooling the air heated by the carbon heat source.

2. The smokeless flavor inhalator according toclaim 1, wherein said cooling element has a plurality of through holes formed therethrough, the through holes providing the cooling element with a heat exchange area of 500 mm²or more.

3. The smokeless flavor inhalator according toclaim 2, wherein said cooling element is arranged adjacent to the carbon heat source in close contact therewith or with a predetermined space therebetween.

4. The smokeless flavor inhalator according toclaim 3, wherein said cooling element contains inorganic matter.

5. The smokeless flavor inhalator according to claim4, wherein the inorganic matter accounts for 90 to 95 weight % of said cooling element.

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