JP5372151B2 - Non-combustible smoking article with carbonaceous heat source - Google Patents

Description

  The present invention relates to a non-combustion smoking article provided with a carbonaceous heat source.

  In recent years, instead of cigarettes, non-combustion smoking articles have been developed that taste flavor without burning tobacco. The non-combustion type smoking article includes a heat source part which is a heat generating member attached to the tip, and a flavor generating part including a flavor generating material in which a flavor component is held on a suitable base material. A carbonaceous heat source is mainly used as the heat source.

  Conventional carbonaceous heat sources are provided with a plurality of through-holes provided in the axial direction to function as an air flow path when the aerosol generating unit is heated and to exhibit initial combustion characteristics (US) Patent No. 4,881,556, US Pat. No. 4,967,774, US Pat. No. 4,989,619, US Pat. No. 4,991,606, US Pat. No. 5,067,499). There is also an example in which the heat source part is formed in a special structure (US Pat. No. 5,183,062). The carbonaceous heat source for many of these non-combustible smoking articles is wrapped with wrapping paper or insulation. Furthermore, it is expedient for conventional carbonaceous heat sources to contain more than 60% by weight, preferably more than 80% by weight of carbon.

  Conventional carbonaceous heat sources are certainly improved in that they efficiently transfer heat to the aerosol generator. However, the heat source composed of an extrusion-molded product of the heat source composition is a solid article except for a plurality of air flow paths, and is difficult to ignite as compared with a normal cigarette. In addition, the large amount of carbon used may cause the carbonaceous heat source to shrink during combustion and fall off the smoking article. Furthermore, in order to efficiently transfer heat to the aerosol generating part and to prevent falling off, the heat source part is mostly covered with a heat insulating material or the like.

  Accordingly, an object of the present invention is to provide a non-combustion type smoking article having a carbonaceous heat source that has improved ignitability, is less likely to fall off during smoking, and does not require a packaging material such as a heat insulating material. .

  According to the present invention, a carbonaceous heat source having a cylindrical outer wall and a partition wall provided inside the partition wall and having a cross section forming a lattice, an air flow path partitioned by the partition wall, and an aerosol generation unit are provided. A non-combustible smoking article is provided.

It is an end view of the carbonaceous heat source used for the non-combustion type smoking article of the present invention. It is sectional drawing of the non-combustion type smoking article of this invention. It is a graph which shows the relationship between the flow path periphery per cross-sectional area of the carbonaceous heat source of the non-combustion type smoking article in one Example of this invention, and an ignition rate. It is a graph which shows the relationship between the flow path periphery per cross-sectional area of the carbonaceous heat source of the non-combustion type smoking article in other Examples of this invention, and an ignition rate.

  The present invention will be described in detail below.

  A non-combustion smoking article according to the present invention includes a cylindrical outer wall and a carbonaceous heat source having an air flow path partitioned by the partition, the partition wall having a cylindrical outer wall and a cross section forming a lattice. A generator.

  The lattice may have any form, and examples thereof include a square lattice, a hexagonal lattice, and a triangular lattice. In FIG. 1, 1 is a square lattice, 2 is a triangular lattice, 3 is a hexagonal lattice, and 4 is an end face of a carbonaceous heat source having partition walls formed into a radial lattice. Further, unlike the carbonaceous heat source 5 in FIG. 1, the partition wall provided in the carbonaceous heat source does not need to be formed so that the cross section thereof is a uniform lattice, and includes an unevenly distributed lattice. It may be formed into.

  The porosity of the carbonaceous heat source can be 50% or more. Here, the “porosity of the carbonaceous heat source” means the ratio of the space per cross-sectional area of the heat source, which is generated by being partitioned by the partition wall in the cross section of the heat source. When the porosity is less than 50%, the ignitability at the time of ignition tends not to be significantly improved. The upper limit of the porosity is limited by the design of the mold when extruding the heat source composition. The porosity of the carbonaceous heat source is preferably 50% to 78%, more preferably 60 to 78%. The ignitability of the non-combustion smoking article of the present invention provided with the carbonaceous heat source having such a large porosity is improved.

  The circumferential length of the carbonaceous heat source is preferably 70 mm or more. If the flow path circumference is less than 70 mm, the ignitability tends to decrease. The upper limit of the flow path circumference is also limited by the mold design. Here, the “flow path circumferential length” means, for example, the total length of the partition walls 10 forming a lattice on the end face of the heat source shown in FIG. The flow path circumference of the carbonaceous heat source is preferably 100 to 180 mm.

The cross-sectional area of the carbonaceous heat source is preferably 9 mm ² or more. If the cross-sectional area is less than 9 mm ^2, it is not preferable in terms of product design.

The circumferential length of the flow path per cross-sectional area of the carbonaceous heat source is preferably 4 mm / mm ² or more. As will be described in detail below, it has been found that there is a certain relationship between the perimeter of the flow path and the ignition rate. It was found that if the flow path perimeter per cross-sectional area is less than 4 mm / mm ² , the ordinary ignition method is inferior in ignitability.

  The heat source composition constituting the carbonaceous heat source preferably contains 10 to 60% by weight of carbon. If the amount of carbon is less than 10% by weight, the flammability of the heat source is poor, which is not preferable. If 60% by weight of carbon is contained, both ignitability and combustibility are sufficient. There is no restriction | limiting in particular in the origin of the carbon to be used, A known carbon can be used. As described above, the heat source composition constituting the carbonaceous heat source used in the non-combustion smoking article of the present invention has a sufficient ignition rate even when the amount of carbon is lower than that in the prior art.

  The heat source composition can contain calcium carbonate (particles) and other inorganic additives for lowering the maximum temperature of the carbonaceous heat source and reducing the amount of carbon monoxide generated. The inorganic additive is generally blended at a ratio of up to 98% by weight, preferably at a ratio of up to 8.0% by weight, and more preferably at a ratio of 0.100 to 3.75% by weight with respect to 1% by weight of carbon. be able to.

  A binder is included to bind calcium carbonate and carbon. The binder is generally in a proportion of 0.010 to 50 wt%, preferably in a proportion of 0.017 to 2.0 wt%, more preferably in a proportion of 0.10 to 0.75 wt% with respect to 1 wt% of carbon. Can be blended. As the binder, alginate, carboxymethylcellulose or a salt thereof, pectin or a salt thereof, carrageenan or a salt thereof, guar gum, or the like can be used.

  The heat source composition can contain an aerosol-generating substance, such as a polyhydric alcohol, in order to facilitate the generation of aerosol in the initial puff. The aerosol-generating substance that can be contained in the heat source composition is generally up to 98% by weight, preferably up to 3.0% by weight, more preferably 1.5% by weight with respect to 1% by weight of carbon. Can be blended.

  Further, the heat source composition may include pulp, tobacco fine powder, and the like. The total amount of pulp and tobacco fine powder is generally up to 98% by weight, preferably up to 3.0% by weight, more preferably 0.50% by weight with respect to 1% by weight of carbon. can do.

  Furthermore, carbonaceous heat sources include boron, aluminum, silicon, titanium, iron, cobalt, nickel, zinc, germanium, zirconium, niobium, molybdenum, ruthenium, rhodium, palladium, silver, tin, cerium, hafnium, tantalum, tungsten A carbon monoxide reducing catalyst such as rhenium, osmium, iridium, platinum, gold, oxides thereof, or a mixture thereof can be mixed with the raw material before forming the carbonaceous heat source.

  For the carbonaceous heat source, a desired substance can be coated on a part or all of the surface in the axial direction of the air flow path. In particular, it is possible to make the carbonaceous heat source substantially air impermeable by coating a layer of particles. The coating material should have low thermal conductivity, be thermally stable, and be non-flammable at the temperature at which the carbonaceous heat source burns. Suitable coating materials include clays and metal oxides such as iron oxide, alumina, titania, silica, silica alumina, zirconia, ceria, zeolite, zirconium phosphate, other ceramics and combinations thereof. These coating materials preferably contain clay and iron oxide. These coating materials can also contain a catalyst having a function of promoting an oxidation reaction from carbon monoxide to carbon dioxide. Examples of these catalysts include platinum, palladium, other transition metals, and oxides thereof.

  Various methods such as those described in US Pat. No. 5,040,551 can be used to coat the desired material on some or all of the axial surfaces of the air flow path. For example, a coating solution or suspension can be sprayed, wetted or painted. Alternatively, a liner made of a coating substance may be inserted into part or all of the axial surface of the air flow path. For example, a substantially air impermeable hollow tube may be inserted in the axial direction of each air flow path.

  The carbonaceous heat source used in the non-combustion type smoking article of the present invention burns while maintaining the form of a partition wall whose cross section forms a lattice. This is presumably because the carbon content of the heat source composition is suppressed as compared with the conventional case. Therefore, even if the heat source is not covered with a heat insulating material or the like as described below, it is possible to prevent the heat source from dropping from the smoking article during smoking.

  The carbonaceous heat source described above can be formed by a molding means such as extrusion molding using a mold corresponding to a desired lattice. The carbonaceous heat source used in the present invention does not need to be provided with a heat insulating material, a wrapping paper, or the like around it like a normal non-combustion type smoking article, and is sufficiently burned and not easily dropped off. Thus, the step of providing a heat insulating material or the like around the carbonaceous heat source can be omitted, which is very advantageous in terms of cost.

  The non-combustion type smoking article of the present invention can be provided with an aerosol generation unit, for example, in a form physically separated from a carbonaceous heat source. Examples of the aerosol generating substance contained in the aerosol generating part include polyhydric alcohols such as glycerin, propylene glycol, triethylene glycol, and tetraethylene glycol, and carboxylic acid fats such as methyl stearate, dimethyl dodecanedioate, and dimethyl tetradecanedioate. Group esters can be used. The aerosol generating substance is usually carried on a suitable carrier. As the carrier, a porous material such as paper or activated carbon can be used. The aerosol generating material is adjusted by absorbing or adsorbing the aerosol generating material on the porous material. Alternatively, glucan gel such as curdlan described in Japanese Patent No. 3118462 can be used as the carrier. That is, an aerosol generating substance is added to an aqueous dispersion of heat irreversibly solidified glucan, and cast into a thin film sheet on a stainless steel belt, for example, and then dried by heating to gel the glucan. The glucan gel holding the aerosol generating substance can be cut or powdered and used as an aerosol generating material.

  An aerosol generating material in which an aerosol generating material having an aerosol generating substance held on a carrier is contained in a cylindrical body formed of a nonflammable material such as a paper sheet containing glass fiber, a ceramic, or a paper sheet lined with a metal foil. Can be configured.

  The smoking article of the present invention can be provided with a flavor generating part including a flavor generating material at the rear end of the aerosol generating part in order to impart a flavor to the aerosol generated from the aerosol generating part. As a flavor generating material, tobacco cutting or a flavor generating medium described in Japanese Patent No. 3118462 can be used. The flavor generating material is accommodated in a cylindrical body similar to the cylindrical body of the aerosol generating portion.

  Furthermore, the smoking article of this invention can have the filter used for the normal cigarette in the rear end part.

  Hereinafter, an example of a non-combustion smoking article using a heat source comprising the carbonaceous heat source composition of the present invention will be described with reference to FIG.

  The smoking article 100 shown in FIG. 2 includes an aerosol generation unit 11, a carbonaceous heat source 12 provided at the tip of the aerosol generation unit 11, a flavor generation unit 36 provided at the rear end of the aerosol generation unit 11, and a flavor generation. The filter part 14 provided in the rear end of the part 36 is provided.

  The aerosol generating unit 11 has a cylindrical body 111 made of a nonflammable material, and for example, a particulate aerosol generating material 112 made of a carrier carrying an aerosol generating substance is accommodated in the cylindrical body 111.

  The carbonaceous heat source 12 has a circular outer shape and can be in the form of various lattices as described above.

  Next, the flavor generating part 36 has a cylindrical body 361 formed of a non-combustible material, and the flavor generating material 362 is accommodated in the cylindrical body 361.

  The filter unit 14 is configured by a filter member 141 (for example, cellulose acetate fiber tow) used in a normal cigarette, and the outer periphery thereof is wound around a web 142.

  The aerosol generating unit 11, the flavor generating unit 36, and the filter unit 14 cover the outer periphery of the rear end of the aerosol generating unit 11, and the entire outer periphery of the flavor generating unit 36 and the filter unit 14, for example, a paper sheet 20 such as cigarette wrapping paper. Connected by.

  The smoking article 100 may have an opening for taking in air during smoking in order to dilute mainstream smoke components (for example, carbon dioxide). In the smoking article 100 shown in FIG. 2, an opening OP is formed through the paper sheet 20 and the web 142 in the filter unit 14.

  Such non-combustible smoking article 100 may have a normal cigarette appearance.

  Hereinafter, although it demonstrates in more detail using an Example, this invention is not limited to these.

Example 1
The relationship between the porosity of the carbonaceous heat source, the channel circumference of the carbonaceous heat source, the heat source cross-sectional area, and the channel perimeter per heat source cross-sectional area and the ignitability was investigated.

The same composition as the heat source composition used in conventional non-combustible smoking articles (made by Nippon Tobacco Inc .; trade name Ayers), that is, 59.6% carbon particles, 12% calcium carbonate, 8 A heat source composition was prepared using 4 wt% graphite and 10 wt% tobacco fine powder as raw materials. This heat source composition was molded using various molds such that the wall thickness of the partition walls and the lattice spacing were different, and the carbonaceous heat sources of Samples 1 to 6 having the end face forms shown in Table 1 were produced.

  Subsequently, the heat source and the heat insulating material surrounding this were extracted from the Ayers product, and the carbonaceous heat sources of Samples 1 to 6 produced as described above were inserted. That is, the configuration of the smoking article other than the heat source is the same as that of the Ayers product.

Conventional Example 1
As Conventional Example 1, a non-combustion-type basic smoking article, which is a trade name Ayers manufactured by Nippon Tobacco Inc., was used.

  The ignitability test was conducted as follows. After preheating with an electric lighter for 3 seconds, smoke was absorbed at 35 ml / 2 seconds. Next, smoke is absorbed again after 58 seconds (that is, a smoking cycle of 60 seconds). At that time, it is visually confirmed whether the entire heat source is red-hot, the red-hot one is “ignitable”, and the one that is not red-hot is “ It was determined as "Ignition not possible". For each of Samples 1 to 6 and Conventional Example 1, a test was performed using 10 smoking articles, and the number of those confirmed to be “ignitable” was A, and “ignition rate = A ÷ 10 × 100 (%)”. From this, the ignition rate was calculated.

  In the analysis of the ignition rate, the ignition rate with respect to the channel circumference per cross-sectional area of the carbonaceous heat source was examined. The result is shown in FIG. Circles indicate the ignition rates of the carbonaceous heat sources of Samples 1 to 6, and triangles indicate the ignition rates of the carbonaceous heat source of Conventional Example 1. Under this condition, the samples 1 and 2 did not show much difference in the ignition rate from the conventional example 1, but in the sample 3, the ignition rate was greatly improved to about 60%. That is, in order to improve the ignitability, it was found that the design of each parameter of the carbonaceous heat source shown in Table 1 is important. In addition, by using a carbonaceous heat source with an air flow path partitioned by partition walls whose cross section forms a lattice, the porosity and flow path circumference are greatly increased compared to a carbonaceous heat source with a conventional aperture pattern. As a result, it was confirmed that the ignitability was improved.

Example 2
In order to confirm only the influence of the number of lattices (flow path circumference) among the parameters shown in Table 1 above, the test was performed by changing the flow path circumference while keeping the porosity and the heat source cross-sectional area constant.

The same heat source composition as Samples 1 to 6 was prepared, and carbonaceous heat sources of Samples 7 to 11 shown in Table 2 were prepared using various molds. That is, the perimeter of the flow path was changed by changing the combination of the wall thickness and the interval of the lattice so that the heat source cross-sectional area and the porosity were constant.

  Next, the heat source and the surrounding heat insulating material were extracted from the Ayers product, and the heat sources of the produced samples 7 to 11 were inserted. That is, the configuration of the non-combustion smoking article other than the heat source is the same as that of the Ayers product.

  In this example, as an ignitability test, smoke was absorbed at 35 ml / 2 seconds after preheating with an electric lighter for 2 seconds. The carbonaceous heat source of Example 2 is easy to ignite, and it is difficult to make a difference under the conditions of Example 1. Therefore, the preheating time was shortened from 3 seconds to 2 seconds so that the ignition rates differed.

  FIG. 4 shows the relationship of the ignition rate with respect to the flow path circumference per cross-sectional area of the carbonaceous heat source. Here, the case where 2 seconds and 3 seconds are used as preheating time is shown, respectively. It can be seen from FIG. 4 that the ignition rate when preheated for 3 seconds is sufficiently high at 60% or more. Moreover, about the thing which shortened the preheating time to 2 second, the relationship which an ignition rate improves by the increase in "flow path perimeter per heat source cross-sectional area" was confirmed like the samples 1-6. At the same time, under the condition that the cross section of the heat source and the porosity are almost constant, the circumference of the flow path can be increased by reducing the thickness of the partition walls as much as possible, narrowing the lattice spacing and increasing the number of lattices. It was confirmed that it was effective for improving the ignitability.

Claims (5)

A cylindrical outer wall and a partition wall provided in the inner wall of which a cross section forms a lattice, an air flow path partitioned by the partition wall, and a flow path circumferential length per cross-sectional area of 4 mm / mm ² or more A non-combustion type smoking article comprising a carbonaceous heat source and an aerosol generator.   The non-combustion smoking article according to claim 1, wherein the porosity of the carbonaceous heat source is 50% or more.   2. The non-combustion smoking article according to claim 1, wherein in the carbonaceous heat source, a flow path circumferential length, which is a total length of the partition walls facing the air flow path, is 70 mm or more. The non-combustion smoking article according to claim 1, wherein a cross-sectional area of the carbonaceous heat source is 9 mm ² or more.   The non-burning smoking article according to claim 1, wherein the amount of carbon in the heat source composition constituting the carbonaceous heat source is 10 to 60% by weight.

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