EP3949765A1 - Verfahren zur herstellung einer kohlenstoff-wärmequelle für ein aromainhalationsinstrument, kompositpartikel, kohlenstoff-wärmequelle für ein aromainhalationsinstrument und aromainhalationsinstrument - Google Patents

Verfahren zur herstellung einer kohlenstoff-wärmequelle für ein aromainhalationsinstrument, kompositpartikel, kohlenstoff-wärmequelle für ein aromainhalationsinstrument und aromainhalationsinstrument Download PDF

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Publication number
EP3949765A1
EP3949765A1 EP19922582.2A EP19922582A EP3949765A1 EP 3949765 A1 EP3949765 A1 EP 3949765A1 EP 19922582 A EP19922582 A EP 19922582A EP 3949765 A1 EP3949765 A1 EP 3949765A1
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EP
European Patent Office
Prior art keywords
heat source
composite particles
particles
carbon heat
slurry
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19922582.2A
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English (en)
French (fr)
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EP3949765A4 (de
Inventor
Atsuro Yamada
Takashi Oda
Kenta Mitsuchi
Masaki Watanabe
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Japan Tobacco Inc
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Japan Tobacco Inc
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Filing date
Publication date
Application filed by Japan Tobacco Inc filed Critical Japan Tobacco Inc
Publication of EP3949765A1 publication Critical patent/EP3949765A1/de
Publication of EP3949765A4 publication Critical patent/EP3949765A4/de
Withdrawn legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D1/00—Cigars; Cigarettes
    • A24D1/22—Cigarettes with integrated combustible heat sources, e.g. with carbonaceous heat sources
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
    • A24B13/00—Tobacco for pipes, for cigars, e.g. cigar inserts, or for cigarettes; Chewing tobacco; Snuff
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
    • A24B15/00—Chemical features or treatment of tobacco; Tobacco substitutes, e.g. in liquid form
    • A24B15/18—Treatment of tobacco products or tobacco substitutes
    • A24B15/28—Treatment of tobacco products or tobacco substitutes by chemical substances
    • A24B15/30—Treatment of tobacco products or tobacco substitutes by chemical substances by organic substances
    • A24B15/32—Treatment of tobacco products or tobacco substitutes by chemical substances by organic substances by acyclic compounds

Definitions

  • the present invention relates to a method for manufacturing a carbon heat source for a flavor inhaler, composite particles, a carbon heat source for a flavor inhaler, and a flavor inhaler.
  • a flavor inhaler that includes a carbon heat source at a distal end and heats a tobacco filler by combustion heat of the carbon heat source.
  • a carbon heat source used for a flavor inhaler can be manufactured by extruding and molding a raw material slurry containing carbon particles and an additive such as a binder, followed by drying.
  • Jpn. Pat. Appln. KOKAI Publication No. S62-224276 discloses an improved method for manufacturing a carbon heat source for the purpose of improvement on combustibility of a carbon heat source.
  • Jpn. Pat. Appln. KOKAI Publication No. S62-224276 discloses, as illustrated in FIG. 1 of the present application, that a carbon heat source 5 is manufactured by spreading a raw material slurry 1 that contains carbon particles la and an aqueous solution (dispersion medium) 1b containing a binder into a sheet shape, drying it, pulverizing the obtained sheet 2, adding water to the obtained pulverized product 3, molding it, and drying the obtained molded article 4.
  • the present inventors manufactured a carbon heat source according to the method described in Jpn. Pat. Appln. KOKAI Publication No. S62-224276 , and they encountered the problem in which molding was difficult. In view of this, they carried out molding by increasing the amount of water added at the time of molding (for example, 34% by mass with respect to the pulverized product), resulting in the molding material adhering to the molding machine (see Comparative Example 1 described later). When water was added in an amount generally used at the time of molding (for example, 30% by mass with respect to the pulverized product), molding was difficult, and while the obtained carbon heat source did not have a problem in ignitability, the strength was not sufficient (see Comparative Example 2 described later).
  • an object of the present invention is to provide a technique relating to a carbon heat source for a flavor inhaler that is excellent in ease of manufacturing, and has a high strength and excellent ignitability.
  • a method for manufacturing a carbon heat source for a flavor inhaler in which the method includes:
  • composite particles comprising carbon particles, calcium carbonate particles, and a binder, and having an average particle diameter D50 of 10 to 150 ⁇ m and a half-value width of 10 to 150 ⁇ m.
  • a carbon heat source for a flavor inhaler obtainable by the method according to the first aspect.
  • a flavor inhaler comprising the carbon heat source according to the third aspect.
  • a method for manufacturing a carbon heat source for a flavor inhaler includes:
  • FIG. 2 schematically shows an example of a method of the present invention.
  • FIG. 2 shows:
  • the dried molded article 8 may be used as a carbon heat source as it is, or may be used as a carbon heat source after being subjected to necessary processes.
  • the raw material slurry 1 includes carbon particles la, calcium carbonate particles 1c, and an aqueous solution (dispersion medium) 1b containing a binder.
  • the carbon particles commercially available activated carbon particles can be used, examples of which include KURARAY COAL SA2300 (average particle diameter: 6.6 ⁇ m, BET specific surface area: 2100 to 2400 m 2 /g, Kuraray Chemical Co., Ltd.), KURARAY COAL PW-Y (particle diameter: 45 ⁇ m or less, BET specific surface area: 1300 to 1500 m 2 /g, Kuraray Chemical Co., Ltd.), and KURARAY COAL SA1500 (average particle diameter: 6.19 ⁇ m, BET specific surface area: 1600 to 1800 m 2 /g).
  • One kind of carbon particles may be used, or a plurality of kinds of carbon particles may be used in combination.
  • the carbon particles are contained in the slurry in an amount of preferably 20 to 90% by mass, and more preferably 30 to 60% by mass, with respect to a mass of a solid content contained in the slurry.
  • solid content refers to components (i.e., non-volatile components) remaining after evaporation of a liquid from the slurry. That is, “solid content” is components remaining when the slurry is made into a state of composite particles or a carbon heat source. Therefore, “solid content” includes not only components (carbon particles and calcium carbonate particles) present in a solid state in the slurry but also components (binder) dissolved in the slurry but remaining after the slurry is dried.
  • calcium carbonate particles As the calcium carbonate particles, calcium carbonate particles generally used in combination with carbon particles as a raw material of a carbon heat source for a flavor inhaler can be used.
  • the calcium carbonate particles can reduce the amount of combustion products, particularly the amount of carbon monoxide generated.
  • the calcium carbonate particles for example, particles having a packed bulk density of 0.3 to 1.0 g/cm 3 can be used.
  • the packed bulk density refers to a bulk density measured after filling a 100 mL vessel with particles in a level-off state (i.e., a state of loose bulk density), adding an equal amount of particles, and tapping 180 times (applying vibration).
  • the calcium carbonate particles have an average particle diameter of preferably 100 ⁇ m or less, and more preferably 10 ⁇ m or less. It is preferable that the average particle diameter of the calcium carbonate particles be as small as possible, and the lower limit thereof is not particularly limited, but is, for example, 0.2 ⁇ m.
  • average particle diameter refers to an average particle diameter D50 based on a volume-based particle size distribution measured by a laser diffraction scattering-type particle size distribution measurement method.
  • calcium carbonate particles commercially available calcium carbonate particles can be used, examples of which include Calpine F (average particle diameter: 3 ⁇ m, packed bulk density: 0.66 g/cm 3 , Yabashi Industries Co., Ltd.).
  • Calpine F average particle diameter: 3 ⁇ m, packed bulk density: 0.66 g/cm 3 , Yabashi Industries Co., Ltd.
  • One kind of calcium carbonate particles may be used, or a plurality of kinds may be used in combination.
  • the calcium carbonate particles are contained in the slurry in an amount of preferably 5 to 75% by mass, and more preferably 40 to 70% by mass, with respect to a mass of a solid content contained in the slurry.
  • a particle diameter ratio of the carbon particles to the calcium carbonate particles can be, for example, 10:1 to 1:10.
  • the mass ratio of the carbon particles to the calcium carbonate particles can be, for example, 5:1 to 1:5.
  • a cellulose derivative As the binder, a cellulose derivative, an alginate or the like may be used.
  • the cellulose derivative include carboxymethyl cellulose, sodium carboxymethyl cellulose, methylhydroxyethyl cellulose, methyl cellulose, and hydroxypropyl cellulose.
  • the binder is contained in the slurry in an amount of preferably 3 to 15% by mass, and more preferably 5 to 10% by mass, with respect to a mass of the solid content contained in the slurry.
  • a carbon heat source is manufactured using composite particles having a small average particle diameter and a sharp particle size distribution; therefore, it is possible to manufacture a carbon heat source having a sufficient strength even when a content of a binder is reduced.
  • a binder content can be reduced as described above. Since the reduction in the binder content increases the content proportions of the carbon particles and the calcium carbonate particles, it is possible to enhance ignitability of the carbon heat source.
  • the ratio of the mass of the solid content contained in the slurry to the mass of the liquid contained in the slurry is preferably 1:1 to 1:9, and more preferably 1:2 to 1:4.
  • the liquid contained in the slurry is generally water.
  • Composite particles having an average particle diameter D50 of 10 to 150 ⁇ m and a half-value width of 10 to 150 ⁇ m are formed using the raw material slurry described above.
  • the average particle diameter D50 is preferably 10 to 120 ⁇ m.
  • average particle diameter D50 refers to an average particle diameter D50 based on a volume-based particle size distribution measured by a laser diffraction scattering-type particle size distribution measurement method.
  • Half-value width refers to a half-value width based on a volume-based particle size distribution measured by a laser diffraction scattering-type particle size distribution measurement method.
  • Half-value width refers to the full width at half maximum.
  • the composite particles can be formed by any method capable of forming particles having the above-described particle diameter and the above-described half-value width.
  • the composite particles can be formed by using a technique of directly atomizing a slurry, more specifically, using spray drying.
  • the composite particles can be formed by spray drying the slurry.
  • Spray drying is a technique of atomizing a liquid or slurry into a gas and rapidly drying it to produce particles.
  • the composite particles can be formed by spraying the slurry into a heated gas by an atomizer or a spray nozzle, and instantaneously drying it to form fine particles.
  • the expression "rapidly drying” or “instantaneously drying” in the context of spray drying refers to drying being completed while the sprayed droplets are in the air (i.e., before falling to the ground).
  • the composite particles can be formed by spray drying the slurry with a rotary atomizer type spray dryer, i.e., by spraying droplets of the slurry into a heated gas by centrifugal force through rotation of a disc type atomizer (rotary atomizer) and instantaneously drying the droplets to form fine particles.
  • the rotary atomizer type spray dryer is suitable for forming composite particles having a small particle diameter and a sharp particle size distribution.
  • composite particles having the above-described average particle diameter D50 and the above-described half-value width can be formed by setting the spraying conditions and drying conditions as follows, for example.
  • the composite particles have a small average particle diameter and a sharp particle size distribution.
  • the composite particles can be molded at a uniform density throughout the entire molded article and at a high density, whereby a strength of a carbon heat source to be manufactured can be improved, and excellent ignitability can be provided.
  • the composite particles preferably have a spherical shape.
  • spherical shape refers to a shape having an average circularity of 0 to 0.2 ⁇ D [ ⁇ m] (here, D refers to an average particle diameter D50 of composite particles) obtained from a micrograph of composite particles.
  • Average circularity refers to an average of circularities of twenty composite particles.
  • centircularity refers to a difference in radius between two circles when a microscopic image of a target particle is sandwiched by two geometric circles in a concentric manner such that an interval between the two concentric circles becomes minimum (JIS B 0621:1984).
  • composite particles When the composite particles are manufactured by spray drying as described above, all the composite particles can generally have a spherical shape. When composite particles all having a spherical shape are molded, the composite particles can be molded at a higher density.
  • composite particles are manufactured by spreading a raw material slurry into a sheet shape and pulverizing the obtained sheet (see FIG. 1 ). Thus, according to the prior art document, the composite particles do not have a spherical shape.
  • the composite particles preferably have a smooth surface when observed with a microscope.
  • all the composite particles can generally have a smooth surface.
  • the composite particles can be molded at a higher density.
  • composite particles are manufactured by spreading a raw material slurry into a sheet shape and pulverizing the obtained sheet (see FIG. 1 ).
  • the composite particles do not have a smooth surface.
  • the composite particles described above are mixed with water, and the resulting mixture is molded.
  • the amount of water mixed with the composite particles be a water amount suitable for the subsequent molding operation.
  • the amount of water mixed with the composite particles is preferably 33 to 67% by mass, and more preferably 38 to 57% by mass, with respect to the composite particles. That is, it is preferable that the mixture be a mixture containing the composite particles and 33 to 67% by mass of water with respect to the composite particles, and it is more preferable that the mixture be a mixture containing the composite particles and 38 to 57% by mass of water with respect to the composite particles.
  • Water serves to dissolve the binder present on the surfaces of the composite particles to thereby bind the composite particles to each other. Therefore, it is preferable that water be uniformly present on the surfaces of the composite particles. It is preferable that the mixture be prepared by spraying water onto the surfaces of the composite particles while the composite particles are fluidized so that the water spreads over the entirety of the surfaces of the composite particles. For example, the mixture can be prepared by spraying water onto the surfaces of the composite particles while the composite particles are stirred.
  • the amount of water contained in the mixture is within the range described above, it has the advantages that it is easy to mold and that the strength of the carbon heat source to be manufactured can be increased.
  • the composite particles tend to adhere to each other and may aggregate.
  • the aggregates of the composite particles may be disaggregated or the composite particles may be classified to select only the composite particles having a predetermined size or less.
  • Molding can be carried out using a molding method generally used in manufacturing of a carbon heat source for a flavor inhaler. Molding can be carried out, for example, through compression molding, extrusion molding, or punch molding. Molding can be carried out preferably through compression molding, and more preferably tablet molding. Molding can be carried out so as to obtain a molded article having a density of, for example, 0.6 to 1.0 g/cm 3 . A pressure during molding can be, for example, 1 to 5 kN.
  • the molded article have a shape of cylinder or polygonal prism under the assumption that the molded article will be incorporated into a cylindrical flavor inhaler.
  • a molded article dried (dried molded article) is manufactured. Drying can be carried out through heat drying.
  • the molded article can be dried at 100 to 200°C for 20 to 60 minutes.
  • the heating temperature may be constant within the above-described heating temperature range, or may vary so that the temperature rises within the above-described heating temperature range.
  • the proportion of water in the dried molded article can be, for example, 10% by mass or less.
  • the dried molded article may be used as a carbon heat source as it is.
  • the dried molded article can be subjected to a chamfering process or a process of providing a groove (e.g., a cross-shaped groove) on the ignition surface.
  • the molded article after the process may be used as a carbon heat source.
  • the chamfering process contributes to reduction of the likelihood of causing cracking or chipping in the corner portion of the carbon heat source.
  • the grooving process contributes to improvement of ignitability.
  • the dried molded article is manufactured by molding the composite particles at a uniform density throughout the entire molded article as well as at a high density, and therefore the strength is high. For this reason, the dried molded article is unlikely to crack or chip even when subjected to a process such as a chamfering process or grooving process, and is suitable for undergoing processes.
  • FIG. 3 An example of a carbon heat source is shown in FIG. 3 .
  • a carbon heat source 10 shown in FIG. 3 has a cylindrical shape.
  • the carbon heat source 10 is incorporated into a flavor inhaler in such a manner that a distal end surface 11 is disposed at a distal end of the flavor inhaler.
  • the carbon heat source 10 has a distal end surface 11, a proximal end surface 12 opposed to the distal end surface 11, a ventilation path 13 for supplying air into the flavor inhaler main body, an outer peripheral surface 14, grooves 15 provided in the distal end surface 11, a first chamfered portion 16 formed between the distal end surface 11 and the outer peripheral surface 14, and a second chamfered portion 17 formed between the proximal end surface 12 and the outer peripheral surface 14.
  • the ventilation path 13 is provided along the central axis C of the carbon heat source 10, and is provided so as to penetrate the carbon heat source 10.
  • the ventilation path 13 communicates with the distal end surface 11 and the proximal end surface 12.
  • the portion on the distal end surface 11 side of the ventilation path 13 is integral with the grooves 15.
  • the ventilation path 13 may be provided by preparing a molded article to have a hollow cylindrical shape having a through hole, or may be provided by preparing a molded article to have a solid cylindrical shape and then forming a through hole with a drill.
  • the grooves 15 are formed to have an overall cross shape as viewed from the distal end surface 11 side.
  • the shape of the grooves 15 is not limited to a cross shape.
  • the number of grooves 15 is discretionary.
  • the shape formed by all of the grooves 15 can be discretionary.
  • a plurality of grooves 15 may extend radially toward the outer peripheral surface 14 about the ventilation path 13.
  • the grooves 15 are formed to be recessed from the distal end surface 11 and the outer peripheral surface 14 so as to extend over them.
  • the grooves 15 are provided so as to communicate with the ventilation path 13.
  • the depth (length) of the grooves 15 with respect to the central axes C direction of the carbon heat source 10 is appropriately set, for example, to be within a range of 1 to 5 mm, and preferably within a range of 2 to 4 mm.
  • the width (inner diameter) of the grooves 15 is appropriately set, for example, to be within a range of 0.5 to 2 mm.
  • the inner diameter of the ventilation path 13 is appropriately set, for example, to be within a range of 0.5 to 4 mm.
  • the above-described method does not have a problem in which molding a carbon heat source is difficult, and is excellent in ease of manufacture. According to the above-described method, a carbon heat source having a high strength and excellent ignitability can be manufactured.
  • the composite particles used for manufacturing the carbon heat source have an average particle diameter D50 of 10 to 150 ⁇ m and a half-value width of 10 to 150 ⁇ m, having a small average particle diameter and a sharp particle size distribution.
  • the composite particles can be molded at a uniform density throughout the entire molded article and at a high density, and this is considered to be the reason that the high strength and excellent ignitability were attained.
  • the strength of the carbon heat source is ensured by use of the above-described composite particles, and therefore, even when the content of the binder is reduced, a carbon heat source having a sufficient strength can be manufactured. Since the reduction in the binder content increases the content proportions of the carbon particles and the calcium carbonate particles, it is possible to enhance ignitability of the carbon heat source.
  • composite particles described in the section ⁇ 1.
  • Method for Manufacturing Carbon Heat Source> there are provided composite particles containing carbon particles, calcium carbonate particles, and a binder, and having an average particle diameter D50 of 10 to 150 ⁇ m and a half-value width of 10 to 150 ⁇ m.
  • composite particles containing carbon particles, calcium carbonate particles, and a binder and having an average particle diameter D50 of 10 to 120 ⁇ m and a half-value width of 10 to 150 ⁇ m.
  • a carbon heat source for a flavor inhaler obtainable by the method described in the section ⁇ 1.
  • Method for Manufacturing Carbon Heat Source> the carbon heat source has a high strength and excellent ignitability.
  • the carbon heat source can have a strength of 140 to 250 N and a density of 0.6 to 1.0 g/cm 3 .
  • the carbon heat source can have a strength of 140 to 250 N and a density of 0.7 to 0.9 g/cm 3 .
  • the carbon heat source has a sufficient strength as a carbon heat source of a flavor inhaler.
  • the density of the carbon heat source is an index correlated with ignitability, and the lower the density, the better the ignitability.
  • the ignitability depends not only on the density of the carbon heat source but also on other factors such as kinds of carbon particles; however, when the density of the carbon heat source is within the above-described range, for example, ignitability can be enhanced.
  • a flavor inhaler including a carbon heat source for a flavor inhaler obtainable by the method described in the section ⁇ 1. Method for Manufacturing Carbon Heat Source>.
  • FIG. 4 shows an example of a flavor inhaler that incorporates the carbon heat source shown in FIG. 3 .
  • a flavor inhaler 20 shown in FIG. 4 includes a hollow cylindrical holder 21 extending from a mouthpiece end 21A to a distal end 21B, a carbon heat source 10 provided on the distal end 21B of the holder 21, a flavor source 22 provided downstream of the carbon heat source 10, an aluminum laminated paper 23 interposed between the holder 21 and the flavor source 22 inside the holder 21, and a filter portion 24 provided on the side of the mouthpiece end 21A inside the holder 21.
  • a cavity is formed between the flavor source 22 and the filter portion 24.
  • Heat generated by combustion of the carbon heat source 10 can heat the flavor source 22 disposed downstream of the carbon heat source 10 to release the flavor.
  • the holder 21 is a paper tube formed by winding paper in a cylindrical shape.
  • the aluminum laminated paper 23 is formed by laminating aluminum on a paper, and as compared with ordinary paper, the heat resistance and the thermal conductivity are improved.
  • the aluminum laminated paper 23 prevents the paper pipe of the holder 21 from burning even when the carbon heat source 10 is ignited.
  • the central axis C of the holder 21 coincides with the central axis C of the carbon heat source 10.
  • the flavor source 22 is provided downstream of the carbon heat source 10 at a position adjacent to the carbon heat source 10.
  • any flavor source capable of releasing a flavor through heating can be used.
  • the flavor source 22 can be prepared by forming a tobacco material such as leaf tobacco into a sheet, applying bellows-like pleats to this tobacco sheet to form a corrugated tobacco sheet, and gathering this corrugated tobacco sheet so as to form a plurality of air flow paths in a longitudinal direction to form a cylindrical body.
  • granules formed from tobacco extracts can be used, or leaf tobacco itself can be used.
  • the flavor source 22 it is possible to adopt any tobacco filler such as general cut tobacco used for cigarettes, granular tobacco used for snuff, roll tobacco, and molded tobacco.
  • the roll tobacco is obtained by forming sheet-shaped reconstituted tobacco into a roll shape, and has a flow path inside.
  • the molded tobacco is obtained by molding granular tobacco with a die.
  • the flavor source 22 in which a tobacco flavor or a flavor other than a tobacco flavor is carried on a carrier made of a porous material or a nonporous material may be adopted.
  • the flavor source 22 may be incorporated into the flavor inhaler 20 after being cylindrically wound with paper, or may be incorporated into the flavor inhaler 20 after being housed in a metal or paper cup.
  • the filter portion 24 is composed of a filter generally used for cigarettes.
  • the filter portion 24 can be formed of various kinds of fillers.
  • the filter portion 24 is composed of a filler of, for example, cellulose-based semisynthetic fiber such as cellulose acetate, but the filler is not limited thereto.
  • the filler include plant fibers such as cotton, hemp, Manila hemp, palm, and rush, animal fibers such as wool and cashmere, cellulose-based regenerated fibers such as rayon, synthetic fibers such as nylon, polyester, acrylic, polyethylene, and polypropylene, or a combination thereof.
  • the constituent element of the filter portion 24 may be a charcoal filter containing charcoal or a filter containing particulates other than charcoal. Furthermore, the filter portion 24 may have a multi-segment structure in which two or more different types of segments are connected in the axial direction.
  • a method for manufacturing a carbon heat source for a flavor inhaler includes:
  • composite particles When composite particles are formed by spray drying according to the above-described method, it is possible to form composite particles having a small average particle diameter and a sharp particle size distribution.
  • composite particles having an average particle diameter D50 of 10 to 150 ⁇ m and a half-value width of 10 to 150 ⁇ m can be formed.
  • D50 average particle diameter
  • half-value width 10 to 150 ⁇ m
  • activated carbon particles were used; specifically, the mixture of KURARAY COAL SA2300 (average particle diameter: 6.6 ⁇ m, BET specific surface area: 2100 to 2400 m 2 /g, Kuraray Chemical Co., Ltd.) and KURARAY COAL PW-Y (particle diameter: 45 ⁇ m or less, BET specific surface area: 1300 to 1500 m 2 /g, Kuraray Chemical Co., Ltd.) (mass ratio of 2:8) was used.
  • As calcium carbonate particles Calpine F (average particle diameter: 3 ⁇ m, packed bulk density: 0.66 g/cm 3 , Yabashi Industries Co., Ltd.) was used.
  • a binder carboxymethyl cellulose was used; specifically, SUNROSE F10LC (Nippon Paper Industries Co., Ltd.) was used.
  • a slurry A1 was prepared by mixing, with a laboratory mixer, a solid content composed of 43% by mass of carbon particles, 49.5% by mass of calcium carbonate particles, and 7.5% by mass of a binder, with water, at a solid-liquid ratio (mass ratio) of 1:3.5.
  • the slurry A1 was spray dried to prepare composite particles.
  • Spray drying was carried out using a rotary atomizer type spray drying apparatus (RDL-050CM). Specifically, the raw material slurry was fed to a rapidly rotating disc, and the droplets were scattered in the heated gas through the centrifugal force to atomize. Thereby, composite particles A1 (average particle diameter (D50) 76 ⁇ m) were prepared.
  • the conditions of spray drying were as follows.
  • a slurry A2 was prepared according to the same procedure as in preparation of the slurry A1, except that the solid content composed of carbon particles, calcium carbonate particles and a binder was mixed with water at a solid-liquid ratio (mass ratio) of 1:3.
  • the slurry A2 was spray dried to prepare composite particles.
  • Spray drying was carried out using a rotary atomizer type spray drying apparatus (SD-6.3R type, GEA Process Engineering Co., Ltd. (former Niro Japan Co., Ltd.)). Specifically, the raw material slurry was fed to a rapidly rotating disc, and the droplets were scattered in the heated gas through the centrifugal force to atomize. Thereby, composite particles A2 (average particle diameter (D50) 94 ⁇ m) were prepared.
  • the conditions of spray drying were as follows.
  • the slurry A3 was spray dried to prepare composite particles.
  • Spray drying was carried out using a rotary atomizer type spray drying apparatus (SDR-27, IS Japan Co., Ltd.). Specifically, the raw material slurry was fed to a rapidly rotating disc, and the droplets were scattered in the heated gas through the centrifugal force to atomize. Thereby, composite particles A3 (average particle diameter (D50) 110 ⁇ m) were prepared.
  • the conditions of spray drying were as follows.
  • a slurry B was prepared according to the same procedure as in preparation of the slurry A1, except that the solid content composed of carbon particles, calcium carbonate particles, and a binder was mixed with water at a solid-liquid ratio (mass ratio) of 1:4.75.
  • the slurry B was formed into a sheet.
  • the sheet was formed using a compact disc (CD) dryer (manufactured by Nishimura Works Co., Ltd.). Specifically, the following procedure was carried out.
  • CD compact disc
  • the gap between the scraper and the disc was adjusted to 0.2 mm.
  • the disc was heated to 140°C, and rotated at 0.8 rpm.
  • the slurry was fed to a circulation tank, and the slurry in the circulation tank was sprayed onto the disc using the pump.
  • the dried product (in a sheet form) dried on the disc was collected with the scraper.
  • the obtained dried product (in a sheet form) was pulverized and classified. Pulverization was carried out using a tabletop mill (Wonder Blender), and classification was carried out using the sieve. Specifically, the following procedure was carried out.
  • the dried product was sieved to classify it into a raw material of 100 ⁇ m or more and 300 ⁇ m or less.
  • the raw material exceeding 300 ⁇ m was fed to a pulverizing apparatus to be pulverized.
  • the operations of classification and pulverization were repeated to obtain pulverized products having a target particle diameter of 100 to 300 ⁇ m.
  • the obtained pulverized products are referred to as composite particles B.
  • the particle size distributions of the composite particles A1, the composite particles A2, the composite particles A3 and the composite particles B were measured.
  • the particle size distribution was measured using the laser diffraction scattering-type particle size distribution measuring device LMS-2000e (Seishin Enterprise Co., Ltd.).
  • the measurement method and the measurement conditions were as follows.
  • Measurement conditions Measurement range 0.20 to 20000.00 ⁇ m Compressed air pressure 0.1 MPa Measurement method Injection type dry measurement
  • the particle size distributions of the composite particles A1, the composite particles A2, and the composite particles A3 are shown in FIGS. 5 to 7 , respectively, and the particle size distribution of the composite particles B is shown in FIG. 8 .
  • the composite particles A1, the composite particles A2, the composite particles A3, and the composite particles B were observed with an optical microscope.
  • FIG. 9 shows a micrograph of the composite particles A2
  • FIG. 10 shows a micrograph of the composite particles B.
  • the composite particles A1 had an average particle diameter D50 of 76 ⁇ m and a half-value width of 62 ⁇ m (see FIG. 5 ).
  • the composite particles A2 had an average particle diameter D50 of 94 ⁇ m and a half-value width of 103 ⁇ m (see FIG. 6 ).
  • the composite particles A3 had an average particle diameter D50 of 110 ⁇ m and a half-value width of 137 ⁇ m (see FIG. 7 ).
  • the composite particles B had an average particle diameter D50 of 221 ⁇ m and a half-value width of 258 ⁇ m (see FIG. 8 ).
  • the composite particles A1, the composite particles A2, and the composite particles A3 had a spherical shape, and smooth particle surfaces (see FIG. 9 ).
  • the average circularity of the composite particles A2 was 11.5 ⁇ m (0.12 ⁇ D50).
  • the composite particles B were pulverized products, they did not have a spherical shape and did not have smooth surfaces (see FIG. 10 ).
  • the average circularity of the composite particles B was 66.7 ⁇ m (0.30 ⁇ D50).
  • Carbon heat sources were manufactured using the composite particles prepared in Test Example 1.
  • a carbon heat source A1 was manufactured from the composite particles A1
  • a carbon heat source A2 was manufactured from the composite particles A2
  • a carbon heat source A3 was manufactured from the composite particles A3, and a carbon heat source B1 and a carbon heat source B2 were manufactured from the composite particles B.
  • Table 1 collectively shows the manufacturing conditions of the carbon heat source A1, the carbon heat source A2, the carbon heat source A3, the carbon heat source B1, and the carbon heat source B2.
  • Table 1 Composition of solid content in slurry Formation of composite particles Molding Carbon particles Calcium carbonate particles Binder Solid-liquid ratio of slurry Method of preparing composite particles Average particle diameter D50 of composite particles Water content at the time of molding Carbon Heat Source A1 43% 49.5% 7.5% 1:3.5 Spray drying slurry 76 ⁇ m 30% Carbon Heat Source A2 43% 49.5% 7.5% 1:3 Spray drying slurry 94 ⁇ m 30% Carbon Heat Source A3 43% 49.5% 7.5% 1:3.5 Spray drying slurry 110 ⁇ m 30% Carbon Heat Source B1 (Comparative Example 1) 43% 49.5% 7.5% 1:4.75 Forming slurry into sheet and pulverizing sheet 220 ⁇ m 34% Carbon Heat Source B2 (Comparative Example 2) 43% 49.5% 7.5% 1:4.75 Forming slurry into sheet and pulverizing sheet 220 ⁇
  • the mixture (base material) of the composite particles A1 and water was classified into a mixture of 500 ⁇ m or less using the sieve.
  • the classified base material was tablet-molded.
  • the tablet molding was carried out using a tablet molding machine CREC (manufactured by Kikusui Seisakusho Ltd.).
  • the base material was molded into a cylindrical shape. Specifically, the following procedure was carried out.
  • the classified base material was fed to a quantitative feeder.
  • the stirring feed shoe was rotated at 80 rpm, and the base material was fed from the quantitative feeder to the stirring feed shoe. With the amount of the base material in the stirring feed shoe being kept constant, the rotary table of the tablet molding machine was rotated at 15 rpm to carry out tablet molding.
  • the tableting pressure was 1.5 to 3.0 kN.
  • the resulting tablet product was dried. Drying was carried out using the constant temperature drier OF-300S (manufactured by ASONE). Specifically, the tablet product was dried at 100°C for 8.6 minutes, and then dried at 200°C for 17.3 minutes.
  • a through hole was formed with a drill to provide a ventilation path 13 as shown in FIG. 3 .
  • the dried tablet product was subjected to the chamfering processing and the cross-shaped groove processing using the cutting device MTC (device name: carbon molded product processing test machine, company name: Yamamoto Kikai Seisakusho K.K.).
  • chamfering was applied to both the distal end surface 11 and the proximal end surface 12, and cross-shaped grooving was applied only to the distal end surface 11.
  • the ventilation path 13 was air-blown, and the groove portion 15 formed by the crossing processing was air-blown. Thereby, a carbon heat source A1 was manufactured.
  • the manufactured carbon heat source A1 had a shape shown in FIG. 3 and the following dimensions.
  • a carbon heat source A2 was manufactured according to the same procedure as in the manufacture of the carbon heat source A1, except that the composite particles A2 were used instead of the composite particles A1.
  • a carbon heat source A3 was manufactured according to the same procedure as in the manufacture of the carbon heat source A1, except that the composite particles A3 were used instead of the composite particles A1.
  • a carbon heat source B1 was manufactured according to the same procedure as in the manufacture of the carbon heat source A1, except that the composite particles B were used instead of the composite particles A1, and that water was added in the amount of 34% by mass based on the composite particles B.
  • a carbon heat source B2 was manufactured according to the same procedure as in the manufacture of the carbon heat source A1, except that the composite particles B were used instead of the composite particles A1.
  • the strength of the carbon heat source was determined by measuring the breaking strength as follows.
  • breaking strength was measured in the carbon heat source. The strength was evaluated based on the values of breaking strength as follows.
  • the ignitability of the carbon heat source was evaluated using a borgwaldt electrothermal lighter with a new filament.
  • the filament of the lighter was attached directly to the carbon heat source.
  • the cross of the filament of the lighter and the cross of the groove of the carbon heat source were directly attached so as to overlap each other.
  • the output of the lighter was set to "strong". Evaluation was made by changing the time from when the switch of the lighter was turned on to when inhalation started. The amount of inhalation was 55 mL/2sec. At the end of inhalation, the lighter was removed from the carbon heat source. When the carbon heat source was red-hot at the second puff (15 seconds later), it was determined that the ignition occurred.
  • the surface (distal end surface) of the carbon heat source disposed on the upper punch side of the tablet molding machine was evaluated.
  • the distal end surface of the carbon heat source is divided into four regions (islands) by the cross-shaped groove processing (see FIG. 3 ).
  • the ignitability was evaluated based on the number of ignited islands.
  • the volume of the carbon heat source having a cylindrical shape was calculated from the diameter of the cylinder and the height of the cylinder.
  • the mass of the carbon heat source was measured.
  • the density [g/cm 3 ] of the carbon heat sources was calculated from the values of the volume and the mass.
  • the density of the carbon heat source is an index correlated with ignitability, and the lower the density, the better the ignitability.
  • the manufacture of the carbon heat source A1, the carbon heat source A2, and the carbon heat source A3 did not have a problem in which molding of carbon heat sources was difficult, and they were excellent in ease of manufacture.
  • the carbon heat source A1, the carbon heat source A2, and the carbon heat source A3 had high strengths and excellent ignitability.
  • All of the composite particles A1, the composite particles A2, and the composite particles A3 that were used to manufacture the carbon heat source A1, the carbon heat source A2, and the carbon heat source A3 had small average particle diameters and sharp particle size distributions.
  • the composite particles could be molded at a uniform density throughout the entire molded article and at a high density, and because of this, it is considered that the strengths of the manufactured carbon heat sources could be improved and excellent ignitability could be provided.
  • the carbon heat source B1 was manufactured by increasing the amount of water added at the time of molding; as a result, the molding material (base material) easily adhered to the tablet molding machine.
  • the base material easily adhered to the inside of the chamber or the compression unit of the tablet molding machine, and continuous production became impossible.
  • the manufactured carbon heat source B1 had a high strength and excellent ignitability, but had a problem in which continuous production was not possible.
  • the carbon heat source B2 was manufactured using the composite particles B by adding water in an amount generally used at the time of molding (i.e., 30% by mass of water with respect to the composite particles B), molding was difficult.
  • the obtained carbon heat source B2 had no problem in ignitability, but the strength was not sufficient.
  • the composite particles B had a larger average particle diameter and a larger half-value width, as compared to the composite particles A1, the composite particles A2, and the composite particles A3. For this reason, the composite particles B could not be molded at a uniform density throughout the entire molded article and at a high density, and it is considered that this caused the problems such as the difficulty in molding and the low strength of the manufactured carbon heat source. In addition, because the composite particles B were pulverized products, they did not have a spherical shape and had an uneven and non-smooth surface. It is considered that the shape of the composite particles B also affected the difficulty in molding and the decrease in the strength of the carbon heat source.

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  • Toxicology (AREA)
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  • General Chemical & Material Sciences (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Cigarettes, Filters, And Manufacturing Of Filters (AREA)
  • Carbon And Carbon Compounds (AREA)
EP19922582.2A 2019-04-04 2019-04-04 Verfahren zur herstellung einer kohlenstoff-wärmequelle für ein aromainhalationsinstrument, kompositpartikel, kohlenstoff-wärmequelle für ein aromainhalationsinstrument und aromainhalationsinstrument Withdrawn EP3949765A4 (de)

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KR20230096602A (ko) * 2021-12-23 2023-06-30 주식회사 케이티앤지 흡연 물품용 가연성 열원 및 이를 포함하는 흡연 물품
KR102692367B1 (ko) * 2021-12-23 2024-08-07 주식회사 케이티앤지 가연성 열원의 성형 방법, 상기 방법으로 제조된 가연성 열원 및 이를 포함하는 흡연 물품

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US4989619A (en) * 1985-08-26 1991-02-05 R. J. Reynolds Tobacco Company Smoking article with improved fuel element
US5076297A (en) 1986-03-14 1991-12-31 R. J. Reynolds Tobacco Company Method for preparing carbon fuel for smoking articles and product produced thereby
JPH101374A (ja) * 1996-03-07 1998-01-06 Rengo Co Ltd 無定形炭素及び珪酸カルシウム水和物からなる多孔質複合成形体及びその製造方法
JP2002011346A (ja) * 2000-06-30 2002-01-15 Taiheiyo Cement Corp 排ガス処理剤
EP1847189B1 (de) 2005-01-06 2015-07-29 Japan Tobacco Inc. Kohlenstoffhaltige hitzequellenzusammensetzung für nicht für die verbrennung bestimmten rauchartikel
WO2015046384A1 (ja) * 2013-09-30 2015-04-02 日本たばこ産業株式会社 香味吸引具
PH12014000291B1 (en) * 2013-10-31 2016-05-02 Glatz Julius Gmbh Tobacco product wrapping material with controlled burning properties
GB201416519D0 (en) * 2014-09-18 2014-11-05 British American Tobacco Co Composite

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