WO2020202528A1 - Method for manufacturing carbon heat source for flavor inhalation tool, composite particles, carbon heat source for flavor inhalation tool, and flavor inhalation tool - Google Patents

Abstract

A method for manufacturing a carbon heat source for a flavor inhalation tool, said method comprising: forming composite particles, which have an average particle diameter D50 of 10-150 μm and a half-value width of 10-150 μm, with the use of, as a starting material, a slurry containing carbon particles, calcium carbonate particles, a binder and water; molding a mixture containing the composite particles and water to give a molded article; and drying the molded article.

Description

Manufacturing method of carbon heat source for flavor aspirator, composite particles, carbon heat source for flavor aspirator, and flavor aspirator

The present invention relates to a method for producing a carbon heat source for a flavor aspirator, composite particles, a carbon heat source for a flavor aspirator, and a flavor aspirator.

A flavor aspirator that has a carbon heat source at the tip and heats the tobacco filler by the combustion heat of the carbon heat source is known. The carbon heat source used in the flavor aspirator can be produced by extrusion-molding a raw material slurry containing carbon particles and an additive such as a binder and drying it.

Japanese Patent Application Laid-Open No. 62-224276 discloses an improved manufacturing method of a carbon heat source for the purpose of improving the flammability of the carbon heat source. Specifically, Japanese Patent Application Laid-Open No. 62-224276 describes a raw material slurry 1 containing carbon particles 1a and an aqueous solution (dispersion medium) 1b containing a binder in the form of a sheet, as shown in FIG. 1 of the present application. It is disclosed that a carbon heat source 5 is produced by stretching and drying, crushing the obtained sheet 2, adding water to the obtained pulverized product 3 for molding, and drying the obtained molded product 4. ..

WO2006 / 073065 discloses that a carbon heat source is produced from a composition containing carbon particles, calcium carbonate particles and a binder, and such carbon heat source can reduce the amount of carbon monoxide generated during combustion of the carbon heat source. Disclose what you can do.

The present inventors encountered a problem that it was difficult to mold when a carbon heat source was produced according to the method described in Japanese Patent Application Laid-Open No. 62-224276. Therefore, when an attempt was made to mold by increasing the amount of water added during molding (for example, in an amount of 34% by mass with respect to the pulverized product), the molding material adhered to the molding machine (Comparative Example 1 described later). See). When molding was performed by adding an amount of water generally used during molding (for example, 30% by weight with respect to the pulverized product), molding was difficult, and the obtained carbon heat source did not show any problem in ignitability, but was strong. Was not sufficient (see Comparative Example 2 below).

Therefore, an object of the present invention is to provide a technique relating to a carbon heat source for a flavor aspirator, which is excellent in ease of manufacture and has high strength and excellent ignitability.

According to the first aspect
Using a slurry containing carbon particles, calcium carbonate particles, a binder and water as a raw material to form composite particles having an average particle size D50 of 10 to 150 μm and a half width of 10 to 150 μm.
A method for producing a carbon heat source for a flavor aspirator is provided, which comprises molding a mixture containing the composite particles and water to obtain a molded product, and drying the molded product.

According to the second aspect, a composite particle containing carbon particles, calcium carbonate particles, and a binder, having an average particle size D50 of 10 to 150 μm and a half width of 10 to 150 μm is provided.

According to the third aspect, there is provided a carbon heat source for a flavor aspirator produced by the method according to the first aspect.
According to the fourth aspect, a flavor aspirator comprising the carbon heat source according to the third aspect is provided.

According to the present invention, it is possible to provide a technique relating to a carbon heat source for a flavor aspirator, which is excellent in ease of manufacture and has high strength and excellent ignitability.

FIG. 1 is a diagram schematically showing a method described in the prior art document. FIG. 2 is a diagram schematically showing an example of the method of the present invention. FIG. 3 is a perspective view showing an example of a carbon heat source for a flavor aspirator. FIG. 4 is a cross-sectional view showing an example of a flavor aspirator. FIG. 5 is a graph showing the particle size distribution of the composite particle A1. FIG. 6 is a graph showing the particle size distribution of the composite particle A2. FIG. 7 is a graph showing the particle size distribution of the composite particle A3. FIG. 8 is a graph showing the particle size distribution of the composite particle B. FIG. 9 is a photomicrograph of the composite particle A2. FIG. 10 is a photomicrograph of the composite particle B.

The present invention will be described in detail below, but the following description is for the purpose of explaining the present invention and is not intended to limit the present invention.

<1. Manufacturing method of carbon heat source ＞
In one aspect, the method for producing a carbon heat source for a flavor aspirator is:
Using a slurry containing carbon particles, calcium carbonate particles, a binder and water as a raw material to form composite particles having an average particle size D50 of 10 to 150 μm and a half width of 10 to 150 μm.
This includes molding a mixture containing the composite particles and water to obtain a molded product, and drying the molded product.

The carbon heat source for the flavor aspirator is a heat source that heats the flavor source in the flavor aspirator by burning the carbon heat source. The flavor source in the flavor aspirator is heated by the combustion heat of the carbon heat source, but is not burned. The flavor source produces flavor by heating. In the following description, the carbon heat source for the flavor aspirator is also simply referred to as a "carbon heat source".

An example of the method of the present invention is schematically shown in FIG. Figure 2 shows
(1) Prepare the raw material slurry 1 and prepare it.
(2) Composite particles 6 are formed from the raw material slurry 1 and
(3) The composite particle 6 is molded to obtain a molded body 7.
(4) It is shown that the molded product 7 is dried to obtain a dried molded product 8.

The dried molded product 8 may be used as it is as a carbon heat source, or may be used as a carbon heat source after performing necessary processing. In FIG. 2, the raw material slurry 1 is composed of carbon particles 1a, calcium carbonate particles 1c, and an aqueous solution (dispersion medium) 1b containing a binder.

The processes of "preparation of raw material slurry", "formation of composite particles", "molding", and "drying" will be described in detail below.

(Preparation of raw material slurry)
The raw material slurry contains carbon particles, calcium carbonate particles, a binder and water.

As the carbon particles, carbon particles generally used as a raw material for a carbon heat source for a flavor aspirator can be used. Specifically, as the carbon particles, any carbon particles that can be burned by ignition can be used. The carbon particles are preferably activated carbon particles, and more preferably activated carbon particles having a BET specific surface area of 1000 to 2500 m ² / g. The carbon particles preferably have an average particle size of 2 to 100 μm, more preferably 5 to 50 μm. Here, the "average particle size" refers to the average particle size D50 based on the volume-based particle size distribution measured by the laser diffraction / scattering type particle size distribution measurement method.

Commercially available activated carbon particles can be used as the carbon particles. For example, Kuraraycol SA2300 (average particle size: 6.6 μm, BET specific surface area: 2100 to 2400 m ² / g, Kuraray Chemical Co., Ltd.), Kuraraycol PW- Y (particle size: 45 μm or less, BET specific surface area: 1300 to 1500 m ² / g, Kuraray Chemical Co., Ltd.), Kuraray Call SA1500 (average particle size: 6.19 μm, BET specific surface area: 1600 to 1800 m ² / g) Be done. One type of carbon particles may be used, or a plurality of types may be used in combination.

The carbon particles are contained in the slurry in an amount of preferably 20 to 90% by mass, more preferably 30 to 60% by mass, based on the mass of the solid content contained in the slurry. As used herein, the term "solid content" refers to a component (ie, non-volatile content) that remains after the liquid is evaporated from the slurry. That is, the "solid content" is a component that remains when the slurry is in the state of composite particles or a carbon heat source. Therefore, the "solid content" includes not only the components (carbon particles, calcium carbonate particles) that are present in the slurry in a solid state, but also the components that are dissolved in the slurry but remain after the slurry is dried (binder). ) Is also included.

As the calcium carbonate particles, calcium carbonate particles generally used in combination with carbon particles can be used as a raw material for a carbon heat source for a flavor aspirator. Calcium carbonate particles can reduce the amount of combustion products, especially the amount of carbon monoxide generated.

As the calcium carbonate particles, for example, particles having a hardness density of 0.3 to 1.0 g / cm ³ can be used. Hardness density was measured after filling a 100 mL container with particles in a ground state (ie, loose bulk density), adding an equal amount of particles, and tapping (vibrating) 180 times. Refers to the density. The calcium carbonate particles preferably have an average particle size of 100 μm or less, more preferably 10 μm or less. Since the smaller the average particle size of the calcium carbonate particles is, the more preferable it is, the lower limit thereof is not particularly limited, but is, for example, 0.2 μm. Here, the "average particle size" refers to the average particle size D50 based on the volume-based particle size distribution measured by the laser diffraction / scattering type particle size distribution measurement method.

As the calcium carbonate particles, commercially available calcium carbonate particles can be used, and examples thereof include carpin F (average particle size: 3 μm, firmness density: 0.66 g / cm ³ , Yabashi Kogyo Co., Ltd.). One type of calcium carbonate particles may be used, or a plurality of types may be used in combination.

The calcium carbonate particles are contained in the slurry in an amount of preferably 5 to 75% by mass, more preferably 40 to 70% by mass, based on the mass of the solid content contained in the slurry.

The particle size ratio of the carbon particles and 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.

As the binder, a binder generally used as a raw material for a carbon heat source for a flavor aspirator can be used. The binder serves to bind the particles (carbon particles and calcium carbonate particles) in the slurry to each other and increase the strength of the carbon heat source. The binder is dissolved in the slurry.

As the binder, a cellulose derivative, alginate, or the like can be used. Examples of the cellulose derivative include carboxymethyl cellulose, sodium carboxymethyl cellulose, methyl hydroxyethyl cellulose, methyl cellulose and hydroxypropyl cellulose.

The binder is contained in the slurry in an amount of preferably 3 to 15% by mass, more preferably 5 to 10% by mass, based on the mass of the solid content contained in the slurry.

As described in the "Effect" column described later, in the present invention, since the carbon heat source is produced using composite particles having a small average particle size and a sharp particle size distribution, it is sufficient to reduce the content of the binder. A strong carbon heat source can be produced. Therefore, in the method of the present invention, the binder content can be reduced as described above. Since the reduction of the binder content increases the content ratio of the carbon particles and the calcium carbonate particles, the ignitability of the carbon heat source can be enhanced.

The ratio of the mass of the solid content contained in the slurry to the mass of the liquid contained in the slurry (hereinafter, also referred to as a solid-liquid ratio) is preferably 1: 1 to 1: 9, more preferably 1: 2 to 1: 1. It is 4. The liquid contained in the slurry is generally water.

When the raw material slurry is stretched into a sheet according to the method of the prior art document described in the background art column (see FIG. 1), the slurry is the mass of the liquid relative to the mass of the solid so that it can be stretched into a sheet. It is necessary to increase the ratio (solid-liquid ratio) of. On the other hand, when the slurry is not made into a sheet but directly atomized to form composite particles, the slurry can reduce the ratio of the mass of the liquid to the mass of the solid content (solid-liquid ratio). By reducing the solid-liquid ratio, the drying time for evaporating the water after that can be shortened, so that the manufacturing cost can be reduced.

(Formation of composite particles)
Using the above-mentioned raw material slurry, composite particles having an average particle size D50 of 10 to 150 μm and a half width of 10 to 150 μm are formed. The average particle size D50 is preferably 10 to 120 μm.

"Average particle size D50" refers to an average particle size D50 based on a volume-based particle size distribution measured by a laser diffraction / scattering type particle size distribution measurement method. "Full width at half maximum" refers to a half width based on a volume-based particle size distribution measured by a laser diffraction / scattering particle size distribution measurement method. "Full width at half maximum" refers to the full width at half maximum.

The composite particles can be formed by any method capable of forming particles having the above particle size and the above half width. The formation of the composite particles can be specifically carried out by using a technique for directly atomizing the slurry, and more specifically, spray drying. Preferably, the formation of the composite particles can be carried out by spray-drying the slurry. Spray drying is a technique in which a liquid or slurry is sprayed into a gas in the form of mist and rapidly dried to produce particles.

More preferably, the composite particles can be formed by spraying the slurry into a heated gas with an atomizer or a spray nozzle and instantaneously drying the slurry to form fine particles. In the description of spray drying, the expressions "rapidly dry" or "momentarily dry" mean that the drying is completed while the sprayed droplets are in the air (ie, before they fall to the ground). It means that it is. More preferably, the composite particles are formed by spray-drying the slurry with a rotary atomizer type spray dryer, that is, the droplets of the slurry are put into a heated gas by centrifugal force by the rotation of a disk-type atomizer (rotary atomizer). It can be done by spraying on the water and instantaneously drying to form fine particles. The rotary atomizer type spray dryer is suitable for forming composite particles having a small particle size and a sharp particle size distribution.

When a rotary atomizer type spray dryer is used, composite particles having the above-mentioned average particle size D50 and the above-mentioned half width can be formed by setting the spraying conditions and the drying conditions as follows, for example.
Disc diameter: 60-200 mm
Disk rotation speed: 8000 to 30000 rpm
Slurry discharge rate: 15-160 L / h
Hot air temperature at the outlet (where the particles come out): 80-150 ° C

As mentioned above, the composite particles have a small average particle size and a sharp particle size distribution. When such composite particles are molded, the composite particles can be molded at a uniform density and a high density throughout the molded product, whereby the strength of the produced carbon heat source can be improved and excellent. It can provide ignitability.

The composite particles preferably have a spherical morphology. Here, the "spherical morphology" means that the average roundness obtained from the micrograph of the composite particle is 0 to 0.2 × D [μm] (where D refers to the average particle size D50 of the composite particle). Refers to a certain form. "Average roundness" refers to the average value of the roundness of 20 composite particles. "Roundness" refers to the difference in radius between two concentric circles when the distance between the two concentric circles is minimized when the microscope image of the target particle is sandwiched between two concentric geometric circles (JIS B). 0621: 1984).

As described above, when the composite particles are produced by spray drying, all the composite particles can usually have a spherical shape. In this way, when composite particles having an all spherical morphology are formed, higher density can be formed. In the prior art document described in the column of background art, composite particles are produced by spreading the raw material slurry into a sheet and pulverizing the obtained sheet (see FIG. 1). Therefore, in the prior art document, the composite particles do not have a spherical morphology.

Also, the composite particles preferably have a smooth surface when observed under a microscope. As described above, when the composite particles are produced by spray drying, all the composite particles can usually have a smooth surface. In this way, molding composite particles, which all have a smooth surface, allows for higher density molding. In the prior art document described in the column of background art, composite particles are produced by spreading the raw material slurry into a sheet and pulverizing the obtained sheet (see FIG. 1). For this reason, in the prior art literature, composite particles do not have a smooth surface.

(Molding)
The composite particles described above are mixed with water to form the resulting mixture.
The amount of water mixed with the composite particles is preferably a water content suitable for the subsequent molding operation. The amount of water mixed with the composite particles is preferably 33 to 67% by mass, more preferably 38 to 57% by mass, based on the composite particles. That is, the mixture is preferably a mixture containing the composite particles and 33 to 67% by mass of water with respect to the composite particles, and the mixture is the composite particles and 38 to 57% by mass of water with respect to the composite particles. More preferably, it is a mixture containing and.

Water dissolves the binder existing on the surface of the composite particles, thereby playing a role of binding the composite particles to each other. Therefore, it is preferable that the water is uniformly present on the surface of the composite particles. It is preferable to prepare the mixture by spraying water on the surface of the composite particles while flowing the composite particles so that the water spreads over the entire surface of the composite particles. For example, the mixture can be prepared by spraying water onto the surface of the composite particles while stirring the composite particles.

When the amount of water contained in the mixture is within the above range, it has the advantage of being easy to mold and the advantage of being able to increase the strength of the produced carbon heat source.

Composite particles in the mixture tend to adhere to each other and may aggregate. Therefore, before forming the mixture, the agglomeration of the composite particles may be loosened, or the composite particles may be classified to select only the composite particles having a predetermined size or smaller.

Molding can be performed using a molding method commonly used in the manufacture of carbon heat sources for flavor aspirators. Molding can be performed, for example, by compression molding, extrusion molding, or punch molding. The molding can be carried out preferably by compression molding, more preferably by tableting molding. Molding can be carried out so as to obtain a molded product having a density of, for example, 0.6 to 1.0 g / cm ³ . The pressure at the time of molding can be, for example, 1 to 5 kN.

The molded body preferably has a cylindrical or polygonal prism shape, assuming that it is incorporated into a cylindrical flavor aspirator.

(Dry)
The molded product is dried to produce a dried molded product (dry molded product). Drying can be performed by heat drying. For example, the molded product can be dried at 100 to 200 ° C. for 20 to 60 minutes. The heating temperature may be constant within the above heating temperature range over the drying period, or may be varied so that the temperature rises within the above heating temperature range. The proportion of water in the dry molded product can be, for example, 10% by mass or less.

The dry molded product may be used as it is as a carbon heat source. Alternatively, the dry molded product can be chamfered or processed to provide a groove (for example, a cross groove) on the ignition surface, if necessary. The molded product after such processing may be used as a carbon heat source. The chamfering process contributes to making it difficult for cracks and chips to occur at the corners of the carbon heat source. Grooving contributes to the improvement of ignitability.

As described above, the dry molded product has high strength because it is produced by molding the composite particles at a uniform density and a high density throughout the molded product. Therefore, the dry molded product is suitable for processing because it is less likely to crack or chip even if it is chamfered or grooved.

(Example of carbon heat source)
An example of a carbon heat source is shown in FIG. The carbon heat source 10 shown in FIG. 3 has a cylindrical shape. The carbon heat source 10 is incorporated into the flavor aspirator so that the tip surface 11 is arranged at the tip of the flavor aspirator.

As shown in FIG. 3, the carbon heat source 10 includes a tip surface 11, a base end surface 12 facing the tip surface 11, a ventilation path 13 for supplying air to the inside of the flavor aspirator body, and an outer peripheral surface 14. , A groove portion 15 provided on the tip surface 11, a first chamfered portion 16 formed between the tip surface 11 and the outer peripheral surface 14, and a second chamfered portion 16 formed between the base end surface 12 and the outer peripheral surface 14. It has a chamfered portion 17.

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 the tip end surface 11 and the base end surface 12. The portion of the air passage 13 on the tip surface 11 side is integrated with the groove portion 15. The ventilation passage 13 may be provided by forming a molded body in a hollow columnar shape having a through hole, or may be provided by forming a through hole with a drill after forming the molded body into a solid columnar shape.

The groove portion 15 is formed in a "cross" shape as a whole when viewed from the tip surface 11 side. The shape of the groove 15 is not limited to a "cross" shape. The number of grooves 15 is arbitrary. Further, the shape formed by the entire groove portion 15 can be any shape. For example, a plurality of groove portions 15 may extend radially from the ventilation path 13 toward the outer peripheral surface 14. Further, the groove portion 15 is formed by being recessed from the tip surface 11 and the outer peripheral surface 14 so as to straddle the groove portion 15. The groove portion 15 is provided so as to communicate with the ventilation passage 13.

The carbon heat source 10 can be formed with the following dimensions. The total length of the carbon heat source 10 (the length of the carbon heat source 10 with respect to the central axis C direction) is appropriately set, for example, in the range of 5 to 30 mm, preferably in the range of 8 to 18 mm. The diameter of the carbon heat source 10 (the length of the carbon heat source 10 in the direction intersecting the central axis C) is appropriately set, for example, in the range of 3 to 15 mm, preferably in the range of 5 to 10 mm. The depth (length) of the groove portion 15 with respect to the central axis C direction of the carbon heat source 10 is appropriately set, for example, in the range of 1 to 5 mm, preferably in the range of 2 to 4 mm. The width (inner diameter) of the groove portion 15 is appropriately set within the range of, for example, 0.5 to 2 mm. The inner diameter of the ventilation passage 13 is appropriately set within the range of, for example, 0.5 to 4 mm.

The carbon heat source 10 does not have to have a ventilation path 13. In this case, it is preferable to form a plurality of small holes for ventilation in the flavor aspirator main body (that is, the holder). When the user sucks the flavor aspirator, air is supplied to the inside of the holder and the flavor source in the holder through the small holes.

(effect)
The above-mentioned method does not have a problem that it is difficult to form a carbon heat source, and is excellent in ease of manufacture. Further, according to the above-mentioned method, a carbon heat source having high strength and excellent ignitability can be produced.

In the above method, the composite particles used for producing a carbon heat source have an average particle size D50 of 10 to 150 μm, a half width of 10 to 150 μm, a small average particle size, and a sharp particle size distribution. Is. When a carbon heat source was produced using such composite particles, the composite particles could be molded at a uniform density and a high density throughout the molded product, whereby high strength and excellent ignitability could be achieved. Conceivable.

In addition, in the above method, since the strength of the carbon heat source is guaranteed by using the above-mentioned composite particles, it is possible to produce a carbon heat source having sufficient strength even if the content of the binder is reduced. Since the reduction of the binder content increases the content ratio of the carbon particles and the calcium carbonate particles, the ignitability of the carbon heat source can be enhanced.

<2. Composite particles>
According to another aspect, <1. The "composite particles" described in the column of method for producing a carbon heat source> are provided. Specifically, composite particles containing carbon particles, calcium carbonate particles, and a binder, having an average particle size D50 of 10 to 150 μm and a half width of 10 to 150 μm are provided. Preferably, a composite particle containing carbon particles, calcium carbonate particles and a binder, having an average particle size D50 of 10 to 120 μm and a half width of 10 to 150 μm is provided.

<3. Carbon heat source>
According to another aspect, <1. A carbon heat source for a flavor aspirator produced by the method described in the column of> Method for producing carbon heat source> is provided. As mentioned above, the carbon heat source has high strength and excellent ignitability. For example, a carbon heat source can have an intensity of 140-250 N and a density of 0.6-1.0 g / cm ³ . Preferably, the carbon heat source can have an intensity of 140-250 N and a density of 0.7-0.9 g / cm ³ .

When the carbon heat source has a strength of 140 N or more, it has sufficient strength as a carbon heat source for the flavor aspirator. The density of the carbon heat source is an index that correlates with the 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 the type of carbon particles, but the ignitability can be improved when the density of the carbon heat source is, for example, within the above range.

<4. Flavor aspirator ＞
According to another aspect, <1. A flavor aspirator containing a carbon heat source for a flavor aspirator produced by the method described in the column of> Method for producing carbon heat source> is provided.

An example of a flavor aspirator incorporating the carbon heat source shown in FIG. 3 is shown in FIG.
The flavor aspirator 20 shown in FIG. 4 has a cylindrical holder 21 extending from the mouthpiece end 21A to the tip 21B, a carbon heat source 10 provided at the tip 21B of the holder 21, and a flavor source provided downstream of the carbon heat source 10. 22 is provided with an aluminum laminating paper 23 interposed between the holder 21 and the flavor source 22 inside the holder 21, and a filter portion 24 provided inside the holder 21 on the mouthpiece end 21A side. In the flavor aspirator 20 shown in FIG. 4, there is a cavity between the flavor source 22 and the filter portion 24.

The heat generated by the combustion of the carbon heat source 10 can heat the flavor source 22 located downstream of the carbon heat source 10 and release the flavor.

The holder 21 is a paper tube formed by winding paper into a cylindrical shape. The aluminum-bonded paper 23 is formed by laminating aluminum on paper, and has improved heat resistance and thermal conductivity as compared with ordinary paper. The aluminum laminated paper 23 prevents the paper tube 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 at a position adjacent to the carbon heat source 10 and downstream of the carbon heat source 10. As the flavor source 22, any flavor source capable of releasing the flavor by heating can be used. For example, the flavor source 22 forms a tobacco material such as leaf tobacco into a sheet, and forms a corrugated tobacco sheet by forming a bellows-shaped fold on the tobacco sheet, and the corrugated tobacco sheet is used as a plurality of air channels in the longitudinal direction. It can be prepared by collecting to form a cylindrical body. Further, as the flavor source 22, granules formed from a tobacco extract or leaf tobacco itself can be used. That is, as the flavor source 22, any tobacco filler such as general tobacco chopped used for cigarettes, granular tobacco used for snuff, rolled tobacco, and molded tobacco can be adopted. Rolled tobacco is obtained by molding sheet-shaped recycled tobacco into a roll shape and has a flow path inside. In addition, molded tobacco is obtained by molding granular tobacco with a mold. Alternatively, as the flavor source 22, a carrier made of a porous material or a non-porous material on which a tobacco flavor or a flavor other than the tobacco flavor is supported may be adopted. The flavor source 22 may be rolled into a cylindrical shape with paper and then incorporated into the flavor aspirator 20, or may be housed in a metal or paper cup and then incorporated into the flavor aspirator 20.

The filter unit 24 is composed of a filter generally used in cigarettes. The filter portion 24 can be formed of various types of fillers. The filter unit 24 is composed of, for example, a filler of cellulosic semi-synthetic fibers such as cellulose acetate, but the filler is not limited to this. Fillers include, for example, plant fibers such as cotton, hemp, Manila hemp, palm and igusa, animal fibers such as wool and cashmere, cellulosic regenerated fibers such as rayon, synthetic fibers such as nylon, polyester, acrylic, polyethylene and polypropylene. A combination of them can be used. The constituent elements of the filter unit 24 may be a charcoal filter containing charcoal or a filter containing granules other than charcoal, in addition to the above-mentioned filler made of cellulose acetate fiber. Further, the filter unit 24 may have a multi-segment structure in which two or more segments of different types are connected in the axial direction.

<5. Method for another aspect>
In another aspect, the method for producing a carbon heat source for a flavor aspirator is
Forming composite particles by spray-drying a slurry containing carbon particles, calcium carbonate particles, a binder, and water.
This includes molding a mixture containing the composite particles and water to obtain a molded product, and drying the molded product.

The above method is <1. It can be carried out according to the same procedure as that described in the column of> Method for producing carbon heat source>.

When composite particles are formed by spray drying according to the above method, composite particles having a small average particle size and a sharp particle size distribution can be formed. Preferably, composite particles having an average particle size D50 of 10 to 150 μm and a half width of 10 to 150 μm can be formed. When such composite particles are molded, the composite particles can be molded at a uniform density and a high density throughout the molded product, whereby the strength of the produced carbon heat source can be improved and excellent. It can provide ignitability.

<6. Preferred Embodiment>
The preferred embodiments are summarized below.
[A1] Using a slurry containing carbon particles, calcium carbonate particles, a binder, and water as a raw material, forming composite particles having an average particle size D50 of 10 to 150 μm and a half width of 10 to 150 μm.
A method for producing a carbon heat source for a flavor aspirator, which comprises molding a mixture containing the composite particles and water to obtain a molded product, and drying the molded product.

[A2] The method according to [A1], wherein the average particle size D50 is 10 to 120 μm, preferably 50 to 150 μm, and more preferably 70 to 120 μm.
[A3] The method according to [A1] or [A2], wherein the half width is 30 to 150 μm, preferably 50 to 150 μm, and more preferably 60 to 140 μm.
[A4] The method according to any one of [A1] to [A3], wherein the composite particles have a spherical shape.

[A5] The method according to any one of [A1] to [A4], wherein the formation of the composite particles is performed by spray-drying the slurry.
[A6] The method according to any one of [A1] to [A5], wherein the formation of the composite particles is performed by spray-drying the slurry with a rotary atomizer type spray dryer.
[A7] Any of [A1] to [A6] in which the binder is contained in the slurry in an amount of 3 to 15% by mass, preferably 5 to 10% by mass, based on the mass of the solid content contained in the slurry. The method according to 1.

[A8] Any of [A1] to [A7], wherein the mixture is a mixture containing the composite particles and 33 to 67% by mass, preferably 38 to 57% by mass of water with respect to the composite particles. The method according to 1.
[A9] The ratio (A: B) of the mass (A) of the solid content contained in the slurry to the mass (B) of the liquid contained in the slurry is 1: 1 to 1: 9, preferably 1: 1. The method according to any one of [A1] to [A8], which is 2 to 1: 4.
[A10] The method according to any one of [A1] to [A9], wherein the carbon particles have an average particle size of 2 to 100 μm, preferably 5 to 50 μm.

[A11] The method according to any one of [A1] to [A10], wherein the carbon particles are activated carbon particles.
[A12] Of [A1] to [A11], the carbon particles are contained in the slurry in an amount of 20 to 90% by mass, preferably 30 to 60% by mass, based on the mass of the solid content contained in the slurry. The method according to any one.
[A13] Any of [A1] to [A12], wherein the calcium carbonate particles have an average particle size of 100 μm or less (for example, 0.2 to 100 μm), preferably 10 μm or less (for example, 0.2 to 10 μm). The method according to 1.

[A14] The calcium carbonate particles are contained in the slurry in an amount of 5 to 75% by mass, preferably 40 to 70% by mass, based on the mass of the solid content contained in the slurry [A1] to [A13]. The method according to any one of.
[A15] The method according to any one of [A1] to [A14], wherein the particle size ratio of the carbon particles to the calcium carbonate particles is 10: 1 to 1:10.
[A16] The method according to any one of [A1] to [A15], wherein the mass ratio of the carbon particles to the calcium carbonate particles is 5: 1 to 1: 5.

[A17] The method according to any one of [A1] to [A16], wherein the binder is a cellulose derivative.
[A18] The method according to [A17], wherein the cellulose derivative is carboxymethyl cellulose, sodium carboxymethyl cellulose, methyl hydroxyethyl cellulose, methyl cellulose, or hydroxypropyl cellulose.
[A19] The method according to [A17] or [A18], wherein the cellulose derivative is carboxymethyl cellulose.

[A20] The method according to any one of [A1] to [A19], wherein the molding is performed by compression molding.
[A21] The method according to any one of [A1] to [A20], wherein the molding is performed by tablet molding.
[A22] The molding is carried out so as to obtain a molded product having a density of 0.6 to 1.0 g / cm ³ , preferably 0.7 to 0.9 g / cm ³ , [A1] to [A21]. The method according to any one of.
[A23] The method according to any one of [A1] to [A22], wherein the molding is performed by applying a pressure of 1 to 5 kN.

[B1] Forming composite particles by spray-drying a slurry containing carbon particles, calcium carbonate particles, a binder, and water.
A method for producing a carbon heat source for a flavor aspirator, which comprises molding a mixture containing the composite particles and water to obtain a molded product, and drying the molded product.

[B2] The method according to [B1], wherein the composite particles have an average particle size D50 of 10 to 150 μm and a half width of 10 to 150 μm.
[B3] The method according to [B2], wherein the average particle size D50 is 10 to 120 μm, preferably 50 to 150 μm, and more preferably 70 to 120 μm.
[B4] The method according to [B2] or [B3], wherein the half width is 30 to 150 μm, preferably 50 to 150 μm, and more preferably 60 to 140 μm.

[B5] The method according to any one of [B1] to [B4], wherein the composite particles have a spherical shape.
[B6] The method according to any one of [B1] to [B5], wherein the formation of the composite particles is performed by spray-drying the slurry with a rotary atomizer type spray dryer.
[B7] Any of [B1] to [B6] in which the binder is contained in the slurry in an amount of 3 to 15% by mass, preferably 5 to 10% by mass, based on the mass of the solid content contained in the slurry. The method according to 1.

[B8] Any of [B1] to [B7], wherein the mixture is a mixture containing the composite particles and 33 to 67% by mass, preferably 38 to 57% by mass of water with respect to the composite particles. The method according to 1.
[B9] The ratio (A: B) of the mass (A) of the solid content contained in the slurry to the mass (B) of the liquid contained in the slurry is 1: 1 to 1: 9, preferably 1: 1. The method according to any one of [B1] to [B8], which is 2 to 1: 4.
[B10] The method according to any one of [B1] to [B9], wherein the carbon particles have an average particle size of 2 to 100 μm, preferably 5 to 50 μm.

[B11] The method according to any one of [B1] to [B10], wherein the carbon particles are activated carbon particles.
[B12] Of [B1] to [B11], the carbon particles are contained in the slurry in an amount of 20 to 90% by mass, preferably 30 to 60% by mass, based on the mass of the solid content contained in the slurry. The method according to any one.
[B13] Any of [B1] to [B12], wherein the calcium carbonate particles have an average particle size of 100 μm or less (for example, 0.2 to 100 μm), preferably 10 μm or less (for example, 0.2 to 10 μm). The method according to 1.

[B14] The calcium carbonate particles are contained in the slurry in an amount of 5 to 75% by mass, preferably 40 to 70% by mass, based on the mass of the solid content contained in the slurry [B1] to [B13]. The method according to any one of.
[B15] The method according to any one of [B1] to [B14], wherein the particle size ratio of the carbon particles to the calcium carbonate particles is 10: 1 to 1:10.
[B16] The method according to any one of [B1] to [B15], wherein the mass ratio of the carbon particles to the calcium carbonate particles is 5: 1 to 1: 5.

[B17] The method according to any one of [B1] to [B16], wherein the binder is a cellulose derivative.
[B18] The method according to [B17], wherein the cellulose derivative is carboxymethyl cellulose, sodium carboxymethyl cellulose, methyl hydroxyethyl cellulose, methyl cellulose, or hydroxypropyl cellulose.
[B19] The method according to [B17] or [B18], wherein the cellulose derivative is carboxymethyl cellulose.

[B20] The method according to any one of [B1] to [B19], wherein the molding is performed by compression molding.
[B21] The method according to any one of [B1] to [B20], wherein the molding is performed by tablet molding.
[B22] The molding is carried out so as to obtain a molded product having a density of 0.6 to 1.0 g / cm ³ , preferably 0.7 to 0.9 g / cm ³ , [B1] to [B21]. The method according to any one of.
[B23] The method according to any one of [B1] to [B22], wherein the molding is performed by applying a pressure of 1 to 5 kN.

[C1] A composite particle containing carbon particles, calcium carbonate particles, and a binder, having an average particle size D50 of 10 to 150 μm and a half width of 10 to 150 μm.
[C2] The composite particle according to [C1], wherein the average particle size D50 is 10 to 120 μm, preferably 50 to 150 μm, and more preferably 70 to 120 μm.
[C3] The composite particle according to [C1] or [C2], wherein the half width is 30 to 150 μm, preferably 50 to 150 μm, and more preferably 60 to 140 μm.

[C4] The composite particle according to any one of [C1] to [C3], wherein the composite particle has a spherical shape.
[C5] The composite particle according to any one of [C1] to [C4], wherein the binder is contained in the composite particle in an amount of 3 to 15% by mass, preferably 5 to 10% by mass.
[C6] The composite particle according to any one of [C1] to [C5], wherein the carbon particles have an average particle size of 2 to 100 μm, preferably 5 to 50 μm.

[C7] The composite particle according to any one of [C1] to [C6], wherein the carbon particles are activated carbon particles.
[C8] The composite particle according to any one of [C1] to [C7], wherein the carbon particle is contained in the composite particle in an amount of 20 to 90% by mass, preferably 30 to 60% by mass.
[C9] Any of [C1] to [C8] in which the calcium carbonate particles have an average particle size of 100 μm or less (for example, 0.2 to 100 μm), preferably 10 μm or less (for example, 0.2 to 10 μm). The composite particle according to 1.

[C10] The composite particle according to any one of [C1] to [C9], wherein the calcium carbonate particles are contained in the composite particles in an amount of 5 to 75% by mass, preferably 40 to 70% by mass.
[C11] The composite particle according to any one of [C1] to [C10], wherein the particle size ratio of the carbon particles to the calcium carbonate particles is 10: 1 to 1:10.
[C12] The composite particle according to any one of [C1] to [C11], wherein the mass ratio of the carbon particles to the calcium carbonate particles is 5: 1 to 1: 5.

[C13] The composite particle according to any one of [C1] to [C12], wherein the binder is a cellulose derivative.
[C14] The composite particle according to [C13], wherein the cellulose derivative is carboxymethyl cellulose, sodium carboxymethyl cellulose, methyl hydroxyethyl cellulose, methyl cellulose, or hydroxypropyl cellulose.
[C15] The composite particle according to [C13] or [C14], wherein the cellulose derivative is carboxymethyl cellulose.

[D1] A carbon heat source for a flavor aspirator produced by the method according to any one of [A1] to [A23].
[D2] A carbon heat source for a flavor aspirator produced by the method according to any one of [B1] to [B23].
[D3] The carbon heat source for a flavor aspirator according to [D1] or [D2], wherein the carbon heat source has an intensity of 140 to 250 N and a density of 0.6 to 1.0 g / cm ³ .
[D4] The carbon heat source for a flavor aspirator according to any one of [D1] to [D3], wherein the carbon heat source has an intensity of 140 to 250 N and a density of 0.7 to 0.9 g / cm ³ .

[E1] A flavor aspirator containing the carbon heat source according to any one of [D1] to [D4].
[E2] A tubular holder extending from the mouthpiece end to the tip, a carbon heat source according to any one of [D1] to [D4] provided at the tip, and inside the holder downstream of the carbon heat source. A flavor aspirator with a provided flavor source.
[E3] The flavor aspirator according to [E2], further including a filter portion provided on the mouthpiece end side inside the holder.
[E4] The flavor aspirator according to [E2] or [E3], further comprising an aluminum laminated paper interposed between the holder and the flavor source.

[Test Example 1] Composite particles 1-1. Preparation of composite particles <Preparation of composite particles A1>
(1) Preparation of slurry A1 As carbon particles, activated carbon particles, specifically, Clarecol SA2300 (average particle size: 6.6 μm, BET specific surface area: 2100 to 2400 m ² / g, Clarecol PW) and Clarecol PW A mixture (2: 8 mass ratio) with −Y (particle size: 45 μm or less, BET specific surface area: 1300 to 1500 m ² / g, Claret Chemical Co., Ltd.) was used. Carpin F (average particle size: 3 μm, firmness density: 0.66 g / cm ³ , Yabashi Kogyo Co., Ltd.) was used as the calcium carbonate particles. Carboxymethyl cellulose, specifically Sunrose F10LC (Nippon Paper Industries, Ltd.), was used as the binder.

A solid-liquid ratio (mass ratio) of 1: 3.5 of solid content consisting of 43% by mass carbon particles, 49.5% by mass calcium carbonate particles, and 7.5% by mass binder, and water. Then, the slurry A1 was prepared by mixing using a laboratory mixer.

(2) Spray drying The slurry A1 was spray-dried to prepare composite particles. The spray drying was performed using a rotary atomizer type spray drying device (RDL-050CM). Specifically, the raw material slurry was sent to a disk rotating at high speed, and droplets were scattered into the heated gas by centrifugal force to atomize the raw material slurry. As a result, composite particles A1 (average particle size (D50) 76 μm) were prepared. The spray drying conditions were as follows.
Disc diameter: 60 mm
Disk rotation speed: 8000 to 13000 rpm
Slurry discharge rate: 15 to 30 L / hour
Outlet (where particles come out) Hot air temperature: 80-120 ° C

<Preparation of composite particles A2>
(1) Preparation of Slurry A2 Preparation of Slurry A1 except that solid content consisting of carbon particles, calcium carbonate particles and a binder and water were mixed at a solid-liquid ratio (mass ratio) of 1: 3. Slurry A2 was prepared according to the same procedure.

(2) Spray drying The slurry A2 was spray dried to prepare composite particles. The spray drying was performed using a rotary atomizer type spray drying device (SD-6.3R type, GEA Process Engineering Co., Ltd. (former company name: Niro Japan)). Specifically, the raw material slurry was sent to a disk rotating at high speed, and droplets were scattered into the heated gas by centrifugal force to atomize the raw material slurry. As a result, composite particles A2 (average particle size (D50) 94 μm) were prepared. The spray drying conditions were as follows.
Disc diameter: 100 mm
Disk rotation speed: 10,000 to 30,000 rpm
Slurry discharge rate: 20-40 L / hour
Outlet (where particles come out) Hot air temperature: 100-150 ° C

<Preparation of composite particles A3>
Slurry A3 was spray-dried to prepare composite particles. The spray drying was carried out using a rotary atomizer type spray drying device (SDR-27, IS Japan Co., Ltd.). Specifically, the raw material slurry was sent to a disk rotating at high speed, and droplets were scattered into the heated gas by centrifugal force to atomize the raw material slurry. As a result, composite particles A3 (average particle size (D50) 110 μm) were prepared. The spray drying conditions were as follows.
Disc diameter: 150 mm
Disk rotation speed: 15,000 to 25,000 rpm
Slurry discharge rate: 70-160 L / hour
Outlet (where particles come out) Hot air temperature: 100-140 ° C

<Preparation of composite particle B>
(1) Preparation of Slurry B Slurry A1 except that solid content composed of carbon particles, calcium carbonate particles and a binder and water were mixed at a solid-liquid ratio (mass ratio) of 1: 4.75. Slurry B was prepared according to the same procedure as the preparation.

(2) Sheet formation Slurry B was sheetized. Sheet formation was performed using a CD (compact disc) dryer (manufactured by Nishimura Iron Works). Specifically, the following procedure was carried out.

In the CD dryer, 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 the circulation tank and the slurry in the circulation tank was sprayed onto the disc using a pump. A dried product (sheet form) dried on a disk was collected with a scraper.

(3) Crush classification The obtained dried product (sheet form) was crushed and classified. The pulverization was performed using a tabletop mill (Wonder Blender), and the classification was performed using a sieve. Specifically, the following procedure was carried out.

The dried product was sieved and classified into raw materials of 100 μm or more and 300 μm or less. A raw material exceeding 300 μm was supplied to a pulverizer and pulverized. The classification and pulverization operations were repeated to obtain a pulverized product having a target particle size of 100 to 300 μm. The obtained pulverized product is called composite particle B.

1-2. Evaluation Method (1) Measurement of Particle Size Distribution The particle size distribution of composite particle A1, composite particle A2, composite particle A3 and composite particle B was measured. The particle size distribution was measured using a laser diffraction / scattering type particle size distribution measuring device LMS-2000e (Seishin Enterprise Co., Ltd.).

The measurement method and measurement conditions were as follows.
Measurement method: 1. Blank measurements were performed using only compressed air.
2. An appropriate amount of the sample was placed in the dry unit.
Measurement conditions: Measurement range 0.20 to 20000.00 μm
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.

(2) Microscopic observation The composite particles A1, the composite particles A2, the composite particles A3, and the composite particles B were observed with an optical microscope. A micrograph of the composite particle A2 is shown in FIG. 9, and a micrograph of the composite particle B is shown in FIG.

1-3. Evaluation results The following was found from the measurement results of the particle size distribution. The composite particle A1 had an average particle size D50 of 76 μm and a half width of 62 μm (see FIG. 5). The composite particle A2 had an average particle size D50 of 94 μm and a half width of 103 μm (see FIG. 6). The composite particle A3 had an average particle size D50 of 110 μm and a half width of 137 μm (see FIG. 7). The composite particle B had an average particle size D50 of 221 μm and a half width of 258 μm (see FIG. 8).

From microscopic observation, the following was found. The composite particles A1, the composite particles A2, and the composite particles A3 had a spherical shape, and the particle surface had a smooth surface (see FIG. 9). The average roundness of the composite particle A2 was 11.5 μm (0.12 × D50). On the other hand, since the composite particle B is a pulverized product, it does not have a spherical shape and does not have a smooth surface (see FIG. 10). The average roundness of the composite particle B was 66.7 μm (0.30 × D50).

[Test Example 2] Carbon heat source A carbon heat source was produced using the composite particles prepared in Test Example 1. A carbon heat source A1 was produced from the composite particles A1, a carbon heat source A2 was produced from the composite particles A2, a carbon heat source A3 was produced from the composite particles A3, and a carbon heat source B1 and a carbon heat source B2 were produced from the composite particles B.

Table 1 summarizes the production 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.

2-1. Manufacture of carbon heat source <Manufacture of carbon heat source A1>
(1) Water addition Water was added to the composite particles A1 prepared in Test Example 1. 30 parts by mass of water was added to 70 parts by mass of the composite particle A1. That is, water was added in an amount of 43% by mass with respect to the composite particles A1. Water was added to the composite particles A1 in a washing bottle, and the obtained mixture was mixed using a Kenmix mixer. Since the composite particles were agglomerated, the agglomerates were crushed. Crushing was performed using a tabletop mill (Wonder Blender). As a result, a mixture (base material) of the mixture A1 and water was prepared. In Table 1, "water content" represents the proportion (mass%) of water in the mixture.

(2) Classification The mixture (base material) of the composite particles A1 and water was classified to 500 μm or less using a sieve.

(3) Molding The base metal after classification was tablet-molded. The tableting molding was performed using a tableting molding machine CREC (manufactured by Kikusui Seisakusho Co., Ltd.). The base material was formed into a cylindrical shape. Specifically, the following procedure was carried out. The base material after classification was supplied to the fixed quantity feeder. The stirring feed shoe was rotated at 80 rpm, and the base material was supplied from the metering feed machine to the stirring feed shoe. While keeping the amount of the base material in the stirring feed shoe constant, the tableting machine rotating disk was rotated at 15 rpm to perform locking. The pressure at the time of striking was 1.5 to 3.0 kN.

(4) Drying The obtained tableted product was dried. Drying was carried out using a constant temperature dryer OF-300S (manufactured by AS ONE). Specifically, the tableted product was dried at 100 ° C. for 8.6 minutes and then at 200 ° C. for 17.3 minutes.

(5) Cutting A through hole was drilled in the dried tableted product, and a ventilation path 13 was provided as shown in FIG. Further, the dried tableted product was chamfered and cross-processed using a cutting device MTC (device name: carbon molded product processing tester, company name: Yamamoto Kikai Seisakusho Co., Ltd.). As shown in FIG. 3, the chamfering process was performed on both the tip surface 11 and the base end surface 12, and the cross process was performed only on the tip surface 11. After the processing, the air passage 13 was air-blown and the groove portion 15 formed by the cross processing was air-blown. As a result, the carbon heat source A1 was manufactured.

The produced carbon heat source A1 had the shape shown in FIG. 3 and had the following dimensions.
Overall length (length of carbon heat source with respect to central axis C direction): 13 mm
Diameter (length of carbon heat source in the direction intersecting the central axis C): 6.49 mm
Depth (length) of groove 15 in the central axis C direction: 3.0 mm
Groove 15 width (inner diameter): 0.6 mm
Inner diameter of ventilation passage 13: 1.0 mm

<Manufacturing of carbon heat source A2>
The carbon heat source A2 was produced according to the same procedure as the production of the carbon heat source A1 except that the composite particles A2 were used instead of the composite particles A1.

<Manufacturing of carbon heat source A3>
The carbon heat source A3 was produced according to the same procedure as the production of the carbon heat source A1 except that the composite particles A3 were used instead of the composite particles A1.

<Manufacturing of carbon heat source B1 (Comparative Example 1)>
The carbon heat source B1 was produced according to the same procedure as that for the carbon heat source A1 except that the composite particles B were used instead of the composite particles A1 and water was added in an amount of 34% by mass with respect to the composite particles B. did.

<Manufacturing of carbon heat source B2 (Comparative Example 2)>
The carbon heat source B2 was manufactured according to the same procedure as that for the carbon heat source A1 except that the composite particles B were used instead of the composite particles A1.

2-2. Evaluation method (1) Strength The strength of the carbon heat source was determined by measuring the fracture strength as follows.
Measuring device: SHIMAZU EZ-S 500N
Maximum load cell pressurization: 500 N
Compression rate: 10 mm / min
Compressor: V-shaped attachment at the tip

The center of the side of the carbon heat source was pressurized until the attachment broke in a direction perpendicular to the carbon heat source, and the pressure at the time of rupture (break strength) was measured. The strength was evaluated as follows based on the value of fracture strength.
〇: Breaking strength 140 [N] or more Δ: Breaking strength 80 [N] or more, less than 140 [N] ×: Breaking strength less than 80 [N]

(2) Ignition property The ignitability of the carbon heat source was evaluated using a new filament borgwalgt electric heating lighter.

The filament of the lighter was directly attached 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. The output of the writer was set to "strong". The time from when the lighter switch was turned on to the start of suction was changed for evaluation. The suction capacity was 55 mL / 2 sec. At the end of suction, the lighter was separated from the carbon heat source. If the carbon heat source was reddish on the second puff (15 seconds later), it was judged to be ignited.

The surface (tip surface) of the carbon heat source arranged on the upper punch side of the tableting machine was evaluated. The tip surface of the carbon heat source is divided into four regions (islands) by cross processing (see FIG. 3). The ignitability was evaluated by the number of ignited islands.
〇: When four islands ignite
Δ: When two or three islands are ignited ×: When one island is ignited or not ignited

(3) Density 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. In addition, the mass of the carbon heat source was measured. The density of the carbon heat source [g / cm ³ ] was calculated from the values of volume and mass. The density of the carbon heat source is an index that correlates with the ignitability, and the lower the density, the better the ignitability.

2-3. Evaluation Results The evaluation results are shown in Table 2.

Regarding the production of the carbon heat source A1, the carbon heat source A2, and the carbon heat source A3, there was no problem that it was difficult to mold the carbon heat source, and the production was excellent. Further, the carbon heat source A1, the carbon heat source A2 and the carbon heat source A3 had high strength and excellent ignitability. The composite particles A1, the composite particles A2, and the composite particles A3 used for producing the carbon heat source A1, the carbon heat source A2, and the carbon heat source A3 all had a small average particle size and a sharp particle size distribution. Therefore, the composite particles can be molded at a uniform density and a high density throughout the molded body, whereby the strength of the produced carbon heat source can be improved and excellent ignitability is provided. It is probable that it was possible.

On the other hand, when a carbon heat source was produced using composite particles B, it was difficult to mold. Therefore, when the carbon heat source B1 was manufactured by increasing the amount of water added during molding, the molding material (base material) easily adhered to the tableting molding machine, and in particular, when continuous production was performed with the tableting molding machine, Initially, it was possible to produce a carbon heat source, but gradually the base metal adhered to the inside of the chamber and compression part of the shaper, making continuous production impossible. The produced carbon heat source B1 had high strength and excellent ignitability, but had a problem that it could not be continuously produced.

When the carbon heat source B2 was produced by adding an amount of water generally used at the time of molding (that is, 30% by weight of water with respect to the composite particles B) using the composite particles B, it was difficult to mold and the obtained carbon was obtained. The heat source B2 did not show any problem in ignitability, but its strength was not sufficient.

The composite particle B had a larger average particle size and a larger half-value width than the composite particle A1, the composite particle A2, and the composite particle A3. Therefore, the composite particles B cannot be molded at a uniform density and a high density throughout the molded body, which makes it difficult to mold and the strength of the produced carbon heat source is low. Is thought to have happened. In addition, since the composite particle B is a pulverized product, it does not have a spherical shape, and the surface is uneven and not smooth. It is considered that such a shape of the composite particle B also affected the difficulty of molding and the decrease in the strength of the carbon heat source.

Claims (16)

1. Using a slurry containing carbon particles, calcium carbonate particles, a binder and water as a raw material to form composite particles having an average particle size D50 of 10 to 150 μm and a half width of 10 to 150 μm.
   A method for producing a carbon heat source for a flavor aspirator, which comprises molding a mixture containing the composite particles and water to obtain a molded product, and drying the molded product.
2. The method according to claim 1, wherein the composite particles have a spherical shape.
3. The method according to claim 1 or 2, wherein the formation of the composite particles is performed by spray-drying the slurry.
4. The method according to any one of claims 1 to 3, wherein the binder is contained in the slurry in an amount of 3 to 15% by mass with respect to the mass of the solid content contained in the slurry.
5. The method according to any one of claims 1 to 4, wherein the mixture is a mixture containing the composite particles and 33 to 67% by mass of water with respect to the composite particles.
6. Claims 1 to 5, wherein the ratio (A: B) of the mass (A) of the solid content contained in the slurry to the mass (B) of the liquid contained in the slurry is 1: 1 to 1: 9. The method according to any one item.
7. The method according to any one of claims 1 to 6, wherein the carbon particles have an average particle size of 2 to 100 μm.
8. The method according to any one of claims 1 to 7, wherein the carbon particles are contained in the slurry in an amount of 20 to 90% by mass with respect to the mass of the solid content contained in the slurry.
9. The method according to any one of claims 1 to 8, wherein the calcium carbonate particles have an average particle size of 100 μm or less.
10. The method according to any one of claims 1 to 9, wherein the calcium carbonate particles are contained in the slurry in an amount of 5 to 75% by mass with respect to the mass of the solid content contained in the slurry.
11. The method according to any one of claims 1 to 10, wherein the binder is a cellulose derivative.
12. The method according to any one of claims 1 to 11, wherein the molding is performed by compression molding.
13. A composite particle containing carbon particles, calcium carbonate particles, and a binder, having an average particle size D50 of 10 to 150 μm and a half width of 10 to 150 μm.
14. A carbon heat source for a flavor aspirator produced by the method according to any one of claims 1 to 12.
15. The carbon heat source for a flavor aspirator according to claim 14, wherein the carbon heat source has an intensity of 140 to 250 N and a density of 0.6 to 1.0 g / cm ³ .
16. A flavor aspirator comprising the carbon heat source according to claim 14 or 15.

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