WO2014097481A1

WO2014097481A1 - Smoking article and filter

Info

Publication number: WO2014097481A1
Application number: PCT/JP2012/083307
Authority: WO
Inventors: 中村　淳; 悠二宮; 明弘杉山
Original assignee: 日本たばこ産業株式会社
Priority date: 2012-12-21
Filing date: 2012-12-21
Publication date: 2014-06-26

Abstract

This smoking article is equipped with: a cigarette section (12); a filter section (15) provided next to the cigarette section (12) and having an end surface on the side thereof opposite the cigarette section (12); and a plurality of openings (17) positioned in the filter section (15) so as to be exposed to the exterior on the end surface (22A), and angled in relation to the center axis (A) of the filter section (15) so as to become farther away from the center axis (A) in the direction toward the end surface (22A).

Description

Smoking article, filter

The present invention relates to a smoking article and a filter provided with a mouthpiece.

For example, a cigarette filter chip is disclosed in which the suction side end of a cylindrical filter chip is cut obliquely. In this filter chip for cigarettes, smoke flows out at right angles to the inclined surface during smoking, and the taste is improved (see, for example, Patent Document 1).

JP 59-102386

However, the conventional filter chip for cigarettes requires a process for cutting the suction side end of the filter chip at an angle at the end of the manufacturing process, which requires a special processing device or manufacture. There has been a problem in that the efficiency is deteriorated.

A smoking article according to one embodiment of the present invention is provided so as to be exposed to the outside by a cigarette part, a filter part provided adjacent to the cigarette part and having an end face opposite to the cigarette part, and the end face. And a plurality of apertures that are inclined with respect to the central axis so as to move away from the central axis of the filter unit as it approaches the end surface.

The filter which concerns on one form of this invention is provided with the cylinder part attached to one edge part of a smoking article, the inner surface of the said cylinder part, and the end surface on the opposite side to the surface facing the said smoking article. And a plurality of openings that are inclined with respect to the central axis so as to be away from the central axis of the filter unit as approaching the end surface. And a hole.

The side view which cut and showed the cigarette which is an example of the smoking article of 1st Embodiment. The table | surface which showed the comparative example 1-6 and Example 1-24 of the cigarette shown in FIG. The perspective view of the cigarette shown in FIG. The side view which expanded and showed the filter part periphery of the cigarette shown in FIG. The schematic diagram which showed the diffusion state of the smoke of the comparative example 1 of the table | surface shown in FIG. The schematic diagram which showed the diffusion state of the smoke of the comparative example 2 of the table | surface shown in FIG. The graph which showed the image analysis result of the smoke of the comparative example 2 of the table | surface shown in FIG. The schematic diagram which showed the spreading | diffusion state of the smoke of Example 1 of the table | surface shown in FIG. The schematic diagram which showed the diffusion state of the smoke of Example 2 of the table | surface shown in FIG. The graph which showed the image analysis result of the smoke of Example 2 of the table | surface shown in FIG. The schematic diagram which showed the diffusion state of the smoke of the comparative example 3 of the table | surface shown in FIG. The schematic diagram which showed the diffusion state of the smoke of the comparative example 4 of the table | surface shown in FIG. The schematic diagram which showed the diffusion state of the smoke of Example 3 of the table | surface shown in FIG. The schematic diagram which showed the diffusion state of the smoke of Example 4 of the table | surface shown in FIG. The graph which showed the image analysis result of the smoke of Example 4 of the table | surface shown in FIG. The schematic diagram which showed the diffusion state of the smoke of Example 5 of the table | surface shown in FIG. The schematic diagram which showed the diffusion state of the smoke of Example 6 of the table | surface shown in FIG. The graph which showed the image analysis result of the smoke of Example 6 of the table | surface shown in FIG. The schematic diagram which showed the diffusion state of the smoke of Example 7 of the table | surface shown in FIG. The graph which showed the image analysis result of the smoke of Example 7 of the table | surface shown in FIG. The schematic diagram which showed the diffusion state of the smoke of Example 8 of the table | surface shown in FIG. The schematic diagram which showed the diffusion state of the smoke of Example 9 of the table | surface shown in FIG. The graph which showed the image analysis result of the smoke of Example 9 of the table | surface shown in FIG. The schematic diagram which showed the diffusion state of the smoke of Example 10 of the table | surface shown in FIG. The schematic diagram which showed the diffusion state of the smoke of Example 11 of the table | surface shown in FIG. The graph which showed the image analysis result of the smoke of Example 11 of the table | surface shown in FIG. The schematic diagram which showed the diffusion state of the smoke of Example 12 of the table | surface shown in FIG. The graph which showed the image analysis result of the smoke of Example 12 of the table | surface shown in FIG. The schematic diagram which showed the diffusion state of the smoke of Example 13 of the table | surface shown in FIG. The graph which showed the image analysis result of the smoke of Example 13 of the table | surface shown in FIG. The schematic diagram which showed the diffusion state of the smoke of Example 14 of the table | surface shown in FIG. The graph which showed the image analysis result of the smoke of Example 14 of the table | surface shown in FIG. The schematic diagram which showed the diffusion state of the smoke of Example 15 of the table | surface shown in FIG. The schematic diagram which showed the diffusion state of the smoke of Example 16 of the table | surface shown in FIG. The schematic diagram which showed the diffusion state of the smoke of Example 17 of the table | surface shown in FIG. The schematic diagram which showed the diffusion state of the smoke of the comparative example 4 of the table | surface shown in FIG. The schematic diagram which showed the diffusion state of the smoke of the comparative example 5 of the table | surface shown in FIG. The schematic diagram which showed the diffusion state of the smoke of Example 18 of the table | surface shown in FIG. The schematic diagram which showed the diffusion state of the smoke of Example 19 of the table | surface shown in FIG. The schematic diagram which showed the diffusion state of the smoke of Example 20 of the table | surface shown in FIG. The schematic diagram which showed the diffusion state of the smoke of Example 21 of the table | surface shown in FIG. The schematic diagram which showed the diffusion state of the smoke of Example 22 of the table | surface shown in FIG. The schematic diagram which showed the diffusion state of the smoke of Example 23 of the table | surface shown in FIG. The schematic diagram which showed the diffusion state of the smoke of Example 24 of the table | surface shown in FIG. The side view which cut and showed partially the smoking tool which is an example of the smoking article of 2nd Embodiment. The side view which cut and showed the filter of embodiment partially.

(First embodiment of smoking article)
Hereinafter, a first embodiment of a cigarette that is an example of a smoking article will be described with reference to FIGS. 1 to 44. In addition, in smoking articles, cigarettes, cigars, hand-rolled cigarettes, cigarillos, smoking utensils that suck tobacco flavor by electronic device heating or heat source, and non-heated smoking utensils that smoke tobacco flavor (product: Zero style mint). In FIG. 1, the upper half of the cigarette 11 is cut by a plane passing through the central axis A.

As shown in FIGS. 1 and 3, the cigarette 11 includes a cigarette portion 12 in which the periphery of a cut leaf (cigarette) is wrapped in a wrapping paper into a cylindrical shape, and a winding paper 14 covering the periphery of the filter main body 13 and the filter main body 13. A cylindrical filter unit 15, a chip paper 16 provided across the cigarette unit 12 and the filter unit 15, and a plurality of apertures 17 provided to be recessed from the end surface 22 A of the filter unit 15 are provided. The cigarette 11 may include a ventilation 18 (ventilation hole), and the ventilation 18 is provided side by side in a band shape (ring shape) at a substantially intermediate position of the filter portion 15.

The ventilation 18 supplies air from the outside into the filter unit 15 to mainly dilute smoke (mainstream smoke) flowing through the filter unit 15 and adjust the amount of tar. In the present embodiment, the ventilations 18 (ventilation holes) are arranged, for example, in two rows of strips (rings) at equal intervals, but the ventilation 18 may be arranged in a row of strips, for example. Two or more rows may be used. The method for opening the ventilation 18 is not limited. For example, a mechanical method of press-opening with a needle-like tooth mold (punch), an electrical method by corona discharge, or a continuous output beam output from a laser oscillator while continuously running a filter chip with a rotating chopper Any of the methods of distributing and irradiating and irradiating using a pulse may be used.

The chip paper 16 is connected to the tobacco part 12 and the filter part 15. The chip paper 16 has a suction port 21 at one end, and overlaps the cigarette portion 12 at the other end opposite to the one end. The ventilation 18 is, for example, a hole provided so as to penetrate the chip paper 16 or a hole that penetrates the chip paper 16 and the web 14 and reaches the filter unit 15.

The material of the chip paper 16 does not matter. The chip paper 16 is generally made of paper made of vegetable fibers, but a sheet using polymer fibers (polypropylene, polyethylene, nylon, etc.) or polymer sheets may be used. Alternatively, a metal foil such as an aluminum foil may be used.

The filter unit 15 is provided adjacent to the tobacco unit 12 at the end opposite to the end surface 22A of the suction port 22. The filter portion can be appropriately set, for example, with a diameter of 5 mm to 9 mm, and in the present embodiment, for example, has a cylindrical shape with a diameter of 8 mm. The filter portion 15 includes a cylindrical core portion 31 positioned on the center side in the radial direction, a cylindrical sheath portion 32 disposed outside the core portion 31, an adjacent surface 33 adjacent to the tobacco portion 12, And an end face 22 A opposite to the adjacent face 33. The diameter of the core part 31 with respect to the diameter of the filter part 15 is set like each Example mentioned later. The ventilation resistance of the core portion 31 is set to be different from the ventilation resistance of the sheath portion 32. Specifically, the ratio of the airflow resistance of the core portion 31 to the airflow resistance of the sheath portion 32 is set as in each embodiment described later.

The filter body 13 (the core part 31 and the sheath part 32) can be formed of various types of fillers. In the present embodiment, the filter main body 13 (the core portion 31 and the sheath portion 32) is made of, for example, a filler of cellulose semisynthetic fibers such as acetate, but the filler is not limited thereto. Filling materials are, for example, plant fibers such as cotton, hemp, manila hemp, palm and rush, animal fibers such as wool and cashmere, cellulosic regenerated fibers such as rayon, cellulose semisynthetic fibers such as acetate, diacetate and triacetate, Synthetic fibers such as nylon, polyester, acrylic, polyethylene, polypropylene, polyacrylonitrile, paper, or combinations thereof can be used.

The filter unit 15 may be configured by a filter containing granular materials other than charcoal, for example, powder with fixed flavor, in addition to the generally well-known acetate filter and charcoal filter. The filter unit 15 may use one segment alone or may be composed of two or more segments. When two or more segments are used, a space may be formed between the segments, or a capsule or a cigarette may be put in the hollow portion.

The type of plasticizer used for the filter body 13 of the filter unit 15 is not limited. For example, triethyl citrate, acetyl triethyl citrate, acetyl tributyl citrate, dibutyl tartrate, ethyl phthalyl ethyl glycolate, methyl phthalyl ethyl glycolate, triacetin, triethyl phosphate, triphenyl phosphate, tripropionin or combinations thereof Can be used. In some cases, a plasticizer may not be used.

The combination of fillers used in the core part 31 and the sheath part 32 is not particularly limited. In general, cellulose acetate is used for the core portion 31 and the sheath portion 32, but any of the above-described materials may be used, and the core portion 31 and the sheath portion 32 may be composed of different types of fillers. Further, in order to make the ventilation resistance of the sheath portion 32 higher than that of the core portion 31, the amount of the plasticizer may be increased more than that of the core portion 31, or the sheath portion 32 may be thermoformed using hot water vapor.

The cigarette 11 may include, for example, menthol flavor. The flavoring method is not particularly limited. For example, in the manufacturing process, it may be sprayed in the form of cigarettes, or the flavor is added to the aluminum foil used in the package, and the flavor is transferred to the smoking article. May be. Further, a string-like substance adsorbing the flavor is arranged in the filter unit 15, a cigarette is processed into a string or particle, or the filler in the filter unit 15 contains a flavor, or a capsule Alternatively, a material containing a flavor or a material in which a flavor is fixed to a powder may be disposed in the filter unit 15.

The type and material of the web 14 used for the filter unit 15 are not limited. An air-permeable web used for general products may be used, or a paper that does not have air-permeability may be used. As the material of the web 14, paper made of vegetable fibers is generally used. However, a sheet using polymer fibers (polypropylene, polyethylene, nylon, etc.) or polymer sheets is used. Alternatively, a metal foil such as an aluminum foil may be used.

A non-wrap filter as shown in FIG. 15 of Japanese Patent No. 4262247 may be used for the filter body 13 (core portion and sheath portion). The non-wrap filter has a filter material and a skin layer that forms the filter material into a cylindrical shape, and the skin layer is obtained by thermoforming the filter material. Therefore, the filter part 15 (core part 31 and sheath part 32) of this embodiment can also be created using a non-wrap filter.

3 and 4, the plurality of apertures 17 are provided so as to be exposed to the outside at a portion corresponding to the sheath portion 32 in the end surface 22A. The plurality of apertures 17 are arranged, for example, in a row of rings (or on one concentric circle). The plurality of apertures 17 may be arranged in a ring shape in a plurality of rows. For example, a plurality of circular apertures 17 are arranged, for example, at equal intervals in one row of rings. Specifically, the number of the opening portions 17 is set as in each embodiment described later.

As shown in FIG. 4, each of the plurality of opening portions 17 is provided obliquely with respect to the central axis A. More specifically, each of the plurality of apertures 17 is inclined with respect to the central axis A so as to be away from the central axis A of the filter unit 15 as it approaches the end surface 22A. Each of the plurality of opening portions 17 includes a first portion 17A provided in the sheath portion 32, a second portion 17B provided in the core portion 31, and a bottom portion 17C.

Each of the plurality of opening portions 17 is formed in a lump by, for example, laser processing, and is formed so as to extend from the sheath portion 32 toward the center of the core portion 31 and stop at a predetermined depth. The depth (length) of the opening portion 17 is set as in each embodiment described later. The opening portion 17 is provided so as to form an angle θ with respect to the central axis A of the filter portion 15. The depth (length) of the opening portion 17 and the angle at which the opening portion 17 is provided can be appropriately set to, for example, 1 ° or more and 89 ° or less. It is set like this.

The manufacturing method of the first portion 17A and the second portion 17B of the opening portion 17 is not limited to the one by laser processing. For example, a mechanical method of press opening with a needle-like tooth mold (punch) or corona discharge An electrical method may be used. In the present embodiment, the opening 17 has a circular shape, but the shape of the opening 17 is not limited. The opening portion 17 is, for example, a circular shape such as a circle or an ellipse, a polygonal shape such as a triangle, a quadrangle, a rhombus, a parallelogram, a trapezoid, a cross, or a star, or a shape obtained by combining these shapes. For example, a keyhole shape or a flag shape may be used. Furthermore, the said shape of the opening part 17 is arbitrary directions. Alternatively, the angle (orientation) may be changed between adjacent apertures 17, or apertures 17 having different shapes may be mixed.

Then, an example of the manufacturing process of the cigarette 11 of this embodiment is demonstrated. First, the cigarette part 12 (winding) and the filter part 15 of two lengths are manufactured by a general method. Then, a filter portion 15 having a length of two is inserted between the two tobacco portions 12. Furthermore, a rod-shaped thing which connected the tobacco part 12 and the filter part 15 is formed by winding up these with the chip paper 16 which has a length for 2 pieces collectively. Then, a continuous output beam output from a laser oscillator such as a CO ₂ laser is distributed in pulses from the outer peripheral direction of the rod using a rotating chopper while running the connected rod-shaped object at a predetermined speed. Irradiate. A ventilation 18 (ventilation hole) is formed in the chip paper 16 by the pulsed laser beam. And the filter part 15 and the chip | tip paper 16 are cut | disconnected with a cutter in the center position of the filter part 15 of two lengths, and the one cigarette 11 is formed. Thereafter, during continuous running, a pulsed oscillator with a predetermined angle θ with respect to the central axis A is used with respect to the end surface 22A of the filter portion 15 by using a laser oscillator having the same configuration as the laser for forming the ventilation 18. By irradiating laser light, a plurality of apertures 17 are formed, and the cigarette 11 is manufactured.

In addition, as a manufacturing process of the cigarette 11, it is not limited to the above. Moreover, after manufacturing the cigarette 11 by a general method, the cigarette 11 may be sent to a laser aperture machine to perforate the aperture portion 17 at an arbitrary angle.

(Smoke observation and smoke image analysis)
Cigarette 11 as an example of a smoking article was manufactured under the conditions of Comparative Example 1-6 and Example 1-24 shown in FIG. The filter portion 15 provided with the core portion 31 and the sheath portion 32 is described as a double coaxial filter, and the filter portion 15 is not provided with the core portion 31 and the sheath portion 32 (the same material is used for the filter portion 15). And uniformly formed) is expressed as cellulose acetate. The end face of the cigarette 11 was irradiated with a laser at an angle θ with respect to the central axis A to produce an aperture having an angle θ with respect to the central axis A (Comparative Example 3-6, Example 1). 24).

A general laser irradiator (for example, a CO ₂ laser irradiator) was used to form the opening 17. Cigarettes 11 having different numbers of holes, depths, angles, and the like were created by changing the number of times of laser irradiation, laser intensity, irradiation angle, and irradiation area. The specifications of the filter unit 15 of the embodiment of the present invention are shown in the table of FIG. In addition, the opening part 17 was provided so that it might open to 22 A of end surfaces in the position about 1 mm inside from the outer edge of the filter part 15 (except the comparative example 4).

The area, depth, and angle of the aperture 17 provided in the end surface 22A of the filter unit 15 were measured as follows. The area of the aperture 17 was obtained by enlarging the end surface 22A of the filter 15 with an optical microscope, and the area of the aperture 17 was measured using general area measurement software. The aperture area was arbitrarily determined by measuring 10 apertures 17 and the product of the arithmetic average and the number of apertures was defined as the aperture area. In the present example, the area per opening portion 17 was about 0.2 mm ² .

As for the depth and angle of the opening portion 17, for example, a razor is inserted from the end face 22A (suction port) of the filter portion 15, and the filter portion 15 is separated into two parts (so as to break the ridge), and an optical microscope or a magnifier. The opening was enlarged and the depth and angle of the opening 17 were measured. As for the depth and angle of the

apertures

17, 10 apertures 17 were arbitrarily measured, and the arithmetic average thereof was defined as the depth of the apertures 17 and the angle of the apertures 17.

The ventilation resistance ratio of the core portion 31 to the sheath portion 32 represents the ratio of the ventilation resistance obtained by converting the ventilation resistance of the sheath portion 32 and the core portion 31 into the same cross-sectional area. When the ratio of the ventilation resistance of the core portion 31 to the sheath portion 32 is greater than 1, smoke passing through the filter portion 15 during smoking is more likely to flow through the sheath portion 32 than the core portion 31. On the other hand, when it is smaller than 1, smoke passing through the filter portion 15 during smoking is more likely to flow through the core portion 31 than the sheath portion 32.

Subsequently, the diffusion state of mainstream smoke (air) was observed for Comparative Example 1-6 and Example 1-24. In this observation, smoke flowing out from the filter unit 15 was allowed to pass through an acrylic transparent container 42, and the state was photographed with a digital video camera, and cut out as an image at an arbitrary time from the start of smoke absorption. Figures 5, 6, 8, 9, 11, 12, 13, 14, 16, 17, 19, 21, 22, 24, 25, 27, 29, 31, 33-44 are schematic representations of one of the images. The smoke position is indicated by a broken line. The smoking conditions were smoke absorption capacity: 55 ml / 2 seconds, and smoke absorption was started when the sample cigarette 11 was naturally burned 20 mm from the tip. 7, 10, 15, 18, 20, 23, 26, 28, 30, and 32 are shown in FIGS. 6, 9, 14, 17, 19, 22, 25, 27, 29, and 29, FIG. The result of image analysis of 31 images is shown.

The image analysis method in each embodiment will be described. For image analysis, general image analysis software was used. In the image analysis of the present embodiment, for example, an image about 0.6 seconds after the start of smoke absorption is subjected to monochrome processing, and then an image (control image) where smoke is not discharged is subjected to monochrome processing. Thereafter, for example, the control image is subtracted from the image after about 0.6 seconds from the start of smoke absorption as a background, and only the monochrome image of smoke after about 0.6 seconds, for example, is extracted from the start of smoke absorption. For example, the whiteness at each position in a direction perpendicular to the central axis A of the filter unit 15 was measured at a position 10 mm away from the suction port 22 (end face). Here, the whiteness is a numerical value from white to black, for example, white is 255, black is 0, and gray is a value between them depending on the darkness. Therefore, the numerical value is high where the smoke is dark, and 0 when there is no smoke.

A graph is prepared by taking a position in the direction perpendicular to the central axis A of the filter unit 15 at a position separated from the filter unit 15 by, for example, about 10 mm on the horizontal axis and taking the whiteness on the vertical axis. Note that the position in the direction perpendicular to the central axis A is standardized so that the position corresponding to the upper end of the filter unit 15 of the corresponding image is 1, and the position corresponding to the lower end of the filter unit 15 is -1. Also, the whiteness is standardized with 1 being the highest whiteness value for each corresponding image. The above-described method is an example of an image analysis method, and other image analysis methods can be employed.

(1) Examination of the structure of the filter section
First, mainstream smoke images of the cellulose acetate filter portion 15 (Comparative Example 1) and the double coaxial filter filter portion 15 (Comparative Example 2) without the aperture 17 are shown in FIGS. 5 and 6, respectively. As shown in FIGS. 5 and 6, in Comparative Example 1 and Comparative Example 2, the mainstream smoke flows out straight from the end surface in the direction of the central axis A with a diameter smaller than the diameter of the filter portion 15. The mainstream smoke has a diameter smaller than the diameter of the filter portion 15 and flows out toward the center of the filter portion 15 because air is taken in from the outside by the ventilation 18 in order to dilute the mainstream smoke. The fact that mainstream smoke is not diffused in Comparative Example 2 is supported by the image analysis results in FIG.

On the other hand, the image of Example 1 is shown in FIG. In the cigarette 11 of Example 1, the filter part 15 of a cellulose acetate is used. A total of 28 apertures 17 are formed, and each aperture 17 has an angle of 45 ° with respect to the central axis A. The depth of the opening portion 17 is 3.2 mm, and the opening portion 17 is exposed to the outside at a portion corresponding to the sheath portion 32 in the end face 22A. As shown in FIG. 8, in Example 1, the mainstream smoke is larger than the diameter of the filter unit 15. The reason why the degree of diffusion is small is that, in the first embodiment, there is a flow of air containing smoke in the vicinity of the outer edge of the filter portion 15, and the flow is oblique air (smoke) passing through the opening portion 17. It is considered that the air flows in the direction of the central axis A.

FIG. 9 shows an image of Example 2. In Example 2, the diameter of the core part 31 is 4 mm. The ratio of the ventilation resistance of the core portion 31 to the ventilation resistance of the sheath portion 32 is 0.46. A total of 28 apertures 17 are formed, and each aperture 17 has an angle of 45 ° with respect to the central axis A. The depth of the opening 17 is 2.5 mm. The opening portion 17 penetrates the sheath portion 32, and the bottom portion 17 C of the opening portion 17 reaches the core portion 31. The opening portion 17 is exposed to the outside at a portion corresponding to the sheath portion 32 in the end face 22A.

As shown in FIG. 9, in the cigarette 11 of the second embodiment, the mainstream smoke can be uniformly diffused at a wider angle than that of the first embodiment. That is, in Example 2, the sheath part 32 has a higher ventilation resistance than the core part 31, and air containing smoke flows through the core part 31 having a lower ventilation resistance. For this reason, there is almost no flow of air containing smoke in the vicinity of the outer edge of the filter portion 15. Therefore, the flow of air flowing in the oblique direction through the opening portion 17 is not hindered, and the smoke or air is diffused in the oblique direction with respect to the central axis A smoothly. Moreover, the smoke diffusion effect in the oral cavity of the cigarette 11 of Example 2 is supported by the image analysis results shown in FIG.

Furthermore, the image of the comparative example 3 is shown in FIG. In Comparative Example 3, a double coaxial filter is employed as the filter portion 15 and the diameter of the core portion 31 is 4 mm. The ratio of the ventilation resistance of the core portion 31 to the ventilation resistance of the sheath portion 32 is 12.8. A total of 28 apertures 17 are formed, and each aperture 17 has an angle of 45 ° with respect to the central axis A. The depth of the opening 17 is 2.8 mm. The opening portion 17 penetrates the sheath portion 32, and the bottom portion 17 C of the opening portion 17 reaches the core portion 31.

As is clear from FIG. 11, in Comparative Example 3, a sufficient diffusion effect of smoke or air could not be obtained. This is because, as in the first embodiment, there is a flow of air containing smoke near the outer edge of the filter portion 15, and the air flows through the opening portion 17 in an oblique direction (smoke is removed). It is conceivable that the flow of the contained air) is obstructed. Further, in Comparative Example 3, the ventilation resistance of the core portion 31 is extremely higher than that of the sheath portion 32, so that most of smoke or air flows through the sheath portion 32. As a result, the same effect as that of reducing the cross-sectional area of the filter portion 15 is exhibited, and the flow velocity of air containing smoke flowing through the sheath portion 32 is increased. For this reason, it is thought that the effect which pushes the flow of the air containing the smoke which flows out through the opening part 17 in the diagonal direction in the direction parallel to the central axis A increases.

From the examination of Examples 1 and 2 and Comparative Example 3, as the filter part 15 provided with the opening part 17, a cellulose acetate filter part 15 (without the core part 31 and the sheath part 32) can be adopted. . Further, the filter portion 15 is constituted by a double coaxial filter, and the ventilation resistance of the sheath portion 32 is higher than the ventilation resistance of the core portion 31 (the ratio of the ventilation resistance of the core portion 31 to the sheath portion 32 is smaller than 1) ) Is even more preferable.

(2) Examination of the position to provide the opening
FIG. 12 shows an image of Comparative Example 4. In Comparative Example 4, a double coaxial filter is employed as the filter portion 15 and the core portion 31 has a diameter of 5 mm. The ratio of the ventilation resistance of the core portion 31 to the ventilation resistance of the sheath portion 32 is 0.15. A total of 20 apertures 17 are formed, and each aperture 17 has an angle of 45 ° with respect to the central axis A. The depth of the opening portion 17 is 2.0 mm. The opening portion 17 is exposed to the outside at a portion corresponding to the core portion 31 in the end face 22A (a position about 1 mm inside from the outer edge of the core portion 31).

As is clear from FIG. 12, in Comparative Example 4, the mainstream smoke flowed out almost straight along the central axis A, and a sufficient diffusion effect of the air containing smoke could not be obtained. This is because it is difficult for air containing smoke to flow through the sheath portion 32 having high ventilation resistance, and most of the air containing smoke flows through the core portion 31. As a result, the same effect as when the cross-sectional area of the filter portion 15 is reduced is exhibited, and the flow velocity of smoke or air flowing through the core portion 31 is increased. For this reason, the air containing the smoke flowing through the core portion 31 results in the air containing the smoke that is about to flow in the oblique direction through the opening portion 17 being swept away in the direction parallel to the central axis A, and the mainstream smoke It is thought that the diffusion effect cannot be obtained.

(3) Examination of the depth of the opening (opening depth)
First, Example 3-5 in which the opening 17 did not reach the core 31 was examined. FIG. 13 shows an image of Example 3. FIG. 14 shows an image of Example 4. FIG. 16 shows an image of Example 5. FIG. 15 shows the image analysis result of Example 4. In Example 3, the diameter of the core part 31 is 3.3 mm. In Example 4, the diameter of the core part 31 is 4.0 mm. In Example 5, the diameter of the core part 31 is 5.0 mm. In each of Examples 3-5, a total of 28 apertures 17 are formed, and each aperture 17 has an angle of 45 ° with respect to the central axis A. In each of Examples 3-5, the opening portion 17 is formed with a depth (length) of 0.3 mm, and does not penetrate the sheath portion 32 and stops in the middle of the sheath portion 32. The opening portion 17 is exposed to the outside at a portion corresponding to the sheath portion 32 in the end face 22A.

13, 14, and 16, it can be seen that the mainstream smoke flowing out from the end face 22 A does not diffuse obliquely with respect to the central axis A. Further, according to FIG. 15, it is understood that the range in which the smoke exists is in the range of +1 to −1, and the mainstream smoke is inside the diameter of the filter unit 15.

Next, Examples 6 and 7 in which some apertures 17 reached the core 31 were examined. FIG. 17 shows an image of Example 6. FIG. 19 shows an image of Example 7. FIG. 18 shows the image analysis result of Example 6. FIG. 20 shows the image analysis result of Example 7. In Examples 6 and 7, the core portion 31 has a diameter of 4.0 mm. In each of Examples 6 and 7, a total of 28 apertures 17 are formed, and each aperture 17 has an angle of 45 ° with respect to the central axis A.

In Example 6, each of the apertures 17 is formed with an average depth (length) of 0.8 mm. Some of the plurality of opening portions 17 penetrate the sheath portion 32, and the bottom portion 17 C of the opening portion 17 reaches the core portion 31. In Example 7, each of the plurality of apertures 17 is formed with an average depth (length) of 1.0 mm. Some of the plurality of opening portions 17 penetrate the sheath portion 32, and the bottom portion 17 C of the opening portion 17 reaches the core portion 31. Further, in the seventh embodiment, the number of the opening portions 17 penetrating the sheath portion 32 is larger than that in the sixth embodiment. In Examples 6 and 7, each of the opening portions 17 is exposed to the outside at a portion corresponding to the sheath portion 32 in the end face 22A.

As shown in FIG. 17, in Example 6, it was found that the mainstream smoke flowing out from the end face 22A was diffused slightly obliquely with respect to the central axis A. From the image analysis result of FIG. 18, in Example 6, smoke is present in a range slightly exceeding ± 1, and mainstream smoke is slightly larger than the diameter of the filter portion 15.

As shown in FIG. 19, in Example 7, smoke spreading in an oblique direction with respect to the central axis A was confirmed as compared with Example 6. Moreover, from the image analysis result of FIG. 20, in the cigarette 11 of Example 7, smoke exists in the range of ± 2, and the smoke diffuses in the range of about twice the diameter of the filter unit 15. I understood.

Subsequently, Examples 8, 9, and 10 in which all the apertures 17 reached the core 31 were studied. FIG. 21 shows an image of Example 8. FIG. 22 shows an image of Example 9. FIG. 24 shows an image of Example 10. FIG. 23 shows the image analysis result of Example 9. In Example 8, the diameter of the core part 31 is 3.3 mm. In Example 9, the diameter of the core part 31 is 4.0 mm. In Example 10, the diameter of the core part 31 is 5.0 mm. In each of Examples 8-10, a total of 28 apertures 17 are formed, and each aperture 17 has an angle of 45 ° with respect to the central axis A. In Example 8, each of the apertures 17 is formed with an average depth of 2.2 mm. In Example 9, each of the apertures 17 is formed with an average depth (length) of 1.4 mm. In Example 10, each of the opening portions 17 is formed with an average depth (length) of 0.7 mm.

As shown in FIG. 21, in Example 8, a large amount of smoke is diffused at a wide angle as compared with Examples 6 and 7. As shown in FIG. 22, in Example 9 as well, a large amount of smoke is diffused at a wide angle as compared with Examples 6 and 7. Further, from the image analysis result shown in FIG. 23, in the cigarette 11 of Example 9, smoke is present up to a range of ± 3.5, and the smoke diffuses in a range of about 3.5 times the diameter of the filter portion. It was confirmed that As shown in FIG. 24, in Example 10, it was confirmed that smoke was diffused at a wider angle than Example 6, although not as much as Examples 8 and 9.

Furthermore, in Example 2, the depth (length) of the opening portion 17 is larger than that in Examples 8-10. For this reason, the bottom portion 17 C of the opening portion 17 reaches almost the center of the core portion 31. FIG. 9 shows an image of Example 2. FIG. 10 shows the image analysis result of Example 2. According to FIG. 9, it was confirmed that the cigarette 11 of Example 2 can diffuse a large amount of smoke in the oral cavity at a wider angle than the cigarette 11 of Examples 8-10. Further, from the image analysis result of FIG. 10, it was confirmed that the cigarette 11 of Example 2 spreads to about four times the diameter of the filter portion 15.

From the above, in order to diffuse smoke in an oblique direction, it is desirable that some of the apertures 17 (bottom 17C) in the plurality of apertures 17 reach the core 31. It is even more desirable that all of the plurality of opening portions 17 reach the core portion 31. It is even more desirable that the bottom portions 17C of the plurality of opening portions 17 reach the inside of the core portion 31 (near the center portion). As described above, by appropriately adjusting the diameter of the core portion 31 and the number of the opening portions 17 penetrating to the core portion 31, the smoke flows linearly along the central axis A and flows in an oblique direction. The ratio of smoke to be generated can be appropriately controlled.

(4) Examination of the angle (opening angle) of the opening with respect to the central axis A
The effect of the opening angle on the spread of mainstream smoke was investigated. FIG. 25 shows an image of Example 11. FIG. 26 shows the image analysis result of Example 11. In Example 11, a total of 28 apertures 17 are formed, and each aperture 17 has an angle of 10 ° with respect to the central axis A. The depth of the opening 17 is 2.5 mm. The opening portion 17 penetrates the sheath portion 32, and the bottom portion 17 C of the opening portion 17 reaches the core portion 31. The opening portion 17 is exposed to the outside at a portion corresponding to the sheath portion 32 in the end face 22A.

As shown in FIGS. 25 and 26, in Example 11, it was confirmed that most of the smoke flows out in the direction along the central axis A. However, when compared with Comparative Example 2 shown in FIG. Similarly, when FIG. 26 of the image analysis result of Example 11 is compared with FIG. 7 of the image analysis result of Comparative Example 2, smoke is present in a range narrower than the diameter of the filter portion 15 in Comparative Example 2. On the other hand, in Example 11, it is understood that the filter portion 15 flows out with the same thickness as the diameter.

FIG. 27 shows an image of Example 12. FIG. 28 shows the image analysis results of Example 12. In Example 12, a total of 28 apertures 17 are formed, and each aperture 17 has an angle of 20 ° with respect to the central axis A. The depth of the opening 17 is 2.5 mm. The opening portion 17 penetrates the sheath portion 32, and the bottom portion 17 C of the opening portion 17 reaches the core portion 31. The opening portion 17 is exposed to the outside at a portion corresponding to the sheath portion 32 in the end face 22A.

According to FIG. 27, in Example 12, most of the smoke flowed out in the horizontal direction, and smoke flowing out in an oblique direction around the smoke was confirmed. It was also confirmed that smoke flowing in an oblique direction diffuses ahead of smoke flowing out in the horizontal direction. As can be seen from FIG. 28, the smoke flowing out from the end face 22 A exists between about 1 to 1.5 times the diameter of the filter portion 15.

FIG. 29 shows an image of Example 13. FIG. 30 shows the image analysis result of Example 13. In Example 13, a total of 28 apertures 17 are formed, and each aperture 17 has an angle of 30 ° with respect to the central axis A. The depth of the opening 17 is 2.5 mm. The opening portion 17 penetrates the sheath portion 32, and the bottom portion 17 C of the opening portion 17 reaches the core portion 31. The opening portion 17 is exposed to the outside at a portion corresponding to the sheath portion 32 in the end face 22A.

According to FIG. 29, in Example 13, the smoke flowing out in the horizontal direction decreased compared to Examples 11 and 12, and more smoke flowing out in the oblique direction was confirmed. Similar to Example 12, it was confirmed that in Example 13, the smoke flowing out in the oblique direction was diffused prior to the smoke flowing out in the direction along the central axis A. According to FIG. 30, it was confirmed that the smoke flowing out from the end face 22 A exists between about 1.5 to 2 times the diameter of the filter portion 15.

FIG. 9 shows an image of Example 2. FIG. 10 shows the image analysis result of Example 2. In Example 2, each of the apertures 17 forms an angle of 45 ° with respect to the central axis A. According to FIG. 9, in the cigarette 11 of Example 2, it was confirmed that there was almost no smoke flowing out in the horizontal direction, and a large amount of smoke was flowing out at a wide angle in the oblique direction. Further, as in Examples 12 and 13, it was confirmed that the smoke flowing out in the oblique direction diffused before the smoke flowing out in the horizontal direction. From FIG. 10, smoke spreads to about four times the diameter of the filter portion 15, and the value of whiteness is approximately the same at each position in the direction intersecting the central axis A. It was confirmed that roughly uniform smoke spreads over a wider angle.

FIG. 31 shows an image of Example 14. FIG. 32 shows the image analysis result of Example 14. In Example 14, each of the opening portions 17 forms an angle of 60 ° with respect to the central axis A. The depth of the opening 17 is 2.5 mm. The opening portion 17 penetrates the sheath portion 32, and the bottom portion 17 C of the opening portion 17 reaches the core portion 31. The opening portion 17 is exposed to the outside at a portion corresponding to the sheath portion 32 in the end face 22A.

According to FIG. 31, in Example 14, in addition to smoke flowing out in the direction along the central axis A, smoke flowing out at a wide angle in the oblique direction was simultaneously confirmed. Since the angle of the opening portion 17 is 60 °, the second portion 17B (or bottom portion 17C) of the opening portion 17 of Example 14 is the second portion 17B of the opening portion 17 of Example 2 (opening angle 45 °). It is closer to the end face 22A than the two portions 17B (or the bottom portion 17C). Accordingly, in Example 14, the ventilation resistance between the second portion of the opening 17 and the end surface 22A is low, so that smoke is more in the direction along the central axis A than in Example 2 where the distance is long. It becomes easy to leak. For this reason, when the opening angle is set to 60 ° as in the fourteenth embodiment, smoke in the direction along the central axis A and smoke in an oblique direction flow out almost simultaneously. According to FIG. 32, the smoke is present up to about four times the diameter of the filter unit 15, but there is also a large amount of smoke within the range of the filter unit 15 diameter (range of −1 to +1). It was confirmed that

From the above, it is preferable that the opening 17 is provided at an angle of 20 ° or more and 60 ° or less with respect to the central axis A because the angle at which the smoke diffuses becomes wide. Furthermore, if the opening portion 17 is provided at an angle of 30 ° or more and 60 ° or less with respect to the central axis A, the angle at which the smoke is diffused becomes wider, which is even more preferable.

(5) Examination of the number of openings
Subsequently, the influence of the number of apertures 17 on the state of mainstream smoke flowing in an oblique direction, particularly the amount of mainstream smoke was examined.

FIG. 33 shows an image of Example 15. FIG. 34 shows an image of Example 16. FIG. 9 shows an image of Example 2. FIG. 35 shows an image of Example 17. In the fifteenth embodiment, ten hole portions 17 are provided, and in the sixteenth embodiment, twenty hole portions 17 are provided. In the second embodiment, 28 hole portions 17 are provided, and in the seventeenth embodiment, 42 hole portions 17 are provided. Each of the opening portions 17 forms an angle of 45 ° with respect to the central axis A.

33, in Example 15, in addition to the smoke flowing out in the direction along the central axis A, smoke flowing out in the oblique direction was confirmed. In the fifteenth embodiment, since the number of the opening portions 17 is small, the amount of smoke flowing out in the oblique direction is small, and the smoke flows out in the form of thin stripes in the oblique direction.

As shown in FIG. 34, in Example 16, in addition to smoke flowing out in the direction along the central axis A, smoke flowing out in an oblique direction was confirmed. Compared to Example 15, in Example 16, it was confirmed that the amount of smoke flowing out in an oblique direction increased.

As shown in FIG. 2, in Example 2, it was confirmed that a large amount of smoke was flowing in an oblique direction. Moreover, the smoke which flows out in the direction along the central axis A was hardly confirmed.

As shown in FIG. 35, in Example 17, it was confirmed that more smoke was flowing out in an oblique direction. Further, it was confirmed that the smoke flowing out in the oblique direction was not a thin streak-like smoke as seen in Example 15, but a thick strip.

From the above examination, it was confirmed that the amount of smoke flowing out in an oblique direction can be adjusted without changing the outflow angle by changing the number of apertures 17.

(6) Examination of ventilation resistance ratio between sheath and core
The influence which the ventilation resistance ratio of the sheath part 32 and the core part 31 has on the spread of mainstream smoke was examined. First, a comparative example in which the core portion 31 was hollow was examined. FIG. 36 shows an image of Comparative Example 4. FIG. 37 shows an image of Comparative Example 5.

In Comparative Example 4, a cavity with a diameter of 2 mm is provided at a position corresponding to the core portion 31 over the entire width of the filter portion 15 in the central axis A direction. In Comparative Example 5, a cavity having a diameter of 4 mm is provided at a position corresponding to the core portion 31 over the entire width of the filter portion 15 in the central axis A direction. For this reason, the ventilation resistance of the hollow portion is zero.

As shown in FIGS. 36 and 37, the mainstream smoke passes through the cavity in the filter unit 15 regardless of the size of the core diameter. For this reason, even if the oblique opening portion 17 is provided on the end surface 22A, a part of the mainstream smoke does not pass through the opening portion 17. Therefore, in Comparative Examples 4 and 5, mainstream smoke flowed out linearly and an effect of diffusing in an oblique direction could not be obtained.

Subsequently, Example 18-21 and Example 2 in which the ventilation resistance ratio of the core part 31 to the sheath part 32 was changed were examined. Each of the cigarettes 11 of Examples 18-21 and Example 2 is formed with a core portion 31 having a diameter of 4 mm. In Example 18, the ratio of the ventilation resistance of the core portion 31 to the ventilation resistance of the sheath portion 32 is 0.05. In Example 19, the ratio of the ventilation resistance of the core portion 31 to the ventilation resistance of the sheath portion 32 is 0.09. In Example 20, the ratio of the ventilation resistance of the core portion 31 to the ventilation resistance of the sheath portion 32 is 0.15. In Example 2, the ratio of the ventilation resistance of the core portion 31 to the ventilation resistance of the sheath portion 32 is 0.46. In Example 21, the ratio of the ventilation resistance of the core portion 31 to the ventilation resistance of the sheath portion 32 is 6.07.

FIG. 38 shows an image of Example 18. In the eighteenth embodiment, the mainstream smoke passes through the core portion 31 without passing through the opening portion 17, and thus flows out linearly along the central axis A.

FIG. 39 shows an image of Example 19. In Example 19, most of the smoke flowing out from the core portion 31 linearly in the direction of the central axis A occupies most of the smoke, and a slight amount of smoke spreading in an oblique direction with respect to the central axis A was confirmed.

FIG. 40 shows an image of Example 20. In Example 20, smoke spreading in an oblique direction with respect to the central axis A was confirmed in addition to the smoke flowing out from the core portion 31 linearly in the central axis A direction.

FIG. 9 shows an image of Example 2. In Example 2, almost no smoke flowing out linearly is seen, and almost all smoke flows out in an oblique direction with respect to the central axis A.

FIG. 41 shows an image of Example 21. In Example 21, smoke spreading in an oblique direction with respect to the central axis A can be confirmed, but the angle at which the smoke spreads is small. This is because a large amount of smoke flows through the sheath portion 32 having a low ventilation resistance, but the flow of the sheath portion 32 acts on the flow that spreads in the oblique direction through the opening portion 17, It is considered that the smoke that spreads in the direction is swept away in the direction of the central axis A. For this reason, it is considered that a sufficient smoke diffusion effect cannot be obtained.

As described above, when the diameter of the core portion 31 is 4 mm, smoke starts to spread when the ratio of the ventilation resistance of the core portion 31 to the ventilation resistance of the sheath portion 32 is 0.09 or more, and smoke that flows out in a straight direction at 0.46. Will be small and the spread of smoke will increase. Further, when the airflow resistance ratio is 6.07, smoke diffusion is suppressed.

Furthermore, the cigarette 11 of Examples 22-24 in which the diameter of the core portion 31 was 2 mm was also examined. In Example 22, the ratio of the ventilation resistance of the core portion 31 to the ventilation resistance of the sheath portion 32 is 0.02. In Example 23, the ratio of the ventilation resistance of the core portion 31 to the ventilation resistance of the sheath portion 32 is 0.05. In Example 24, the ratio of the ventilation resistance of the core portion 31 to the ventilation resistance of the sheath portion 32 is 0.15.

FIG. 42 shows an image of Example 22. In Example 22, it was confirmed that smoke firstly flowed out linearly from the core portion 31 in the direction of the central axis A, and then a small amount of smoke flowed in an oblique direction from the opening portion 17.

FIG. 43 shows an image of Example 23. In Example 23, the flow that flows out linearly along the central axis A is suppressed, and the smoke that flows out obliquely with respect to the central axis A instead increases.

FIG. 44 shows an image of Example 24. In Example 24, it was confirmed that almost no flow outflowing linearly in the direction of the central axis A was observed, and the flow expanded at a wide angle in an oblique direction with respect to the central axis A.

As described above, when the diameter of the core portion 31 is 2 mm, even when the ratio of the ventilation resistance of the core portion 31 to the ventilation resistance of the sheath portion 32 is smaller than that when the diameter of the core portion 31 is 4 mm, On the other hand, it turned out that smoke spreads diagonally. That is, when the ratio of the airflow resistance of the core portion 31 to the airflow resistance of the sheath portion 32 is 0.02 or more, the mainstream smoke starts to spread in an oblique direction, and when 0.05 or more, a sufficient amount is obtained in an oblique direction with respect to the central axis A. It was found that smoke spreads, and at 0.15 or more, the amount of smoke flowing out in the direction of the central axis A becomes small, and a uniform smoke spread can be obtained at a wide angle.

According to the first embodiment and Examples 1-24, the smoking article (cigarette 11) has the cigarette part 12, the end face 22A that is provided adjacent to the cigarette part 12 and opposite to the cigarette part 12. The filter unit 15 is provided on the filter unit 15 so as to be exposed to the outside at the end surface 22A, and is inclined with respect to the central axis A so as to move away from the central axis A of the filter unit 15 as the end surface 22A is approached. And an opening 17.

It is generally known that organs that sense taste in the oral cavity are distributed mainly in the tongue, organs that feel somatic sensation are distributed throughout the mouth, and organs that feel fragrance are distributed in the nasal cavity. Therefore, smokers can enjoy the taste and aroma even more by efficiently applying smoke or steam to their recipient organs. In addition, it is known that the mainstream smoke flow is effectively changed by changing the flow of the mainstream smoke.

According to the above configuration, mainstream smoke can be diffused not only in the direction along the central axis A but also in the oblique direction with respect to the central axis A. Thereby, air containing smoke can be diffused uniformly in the oral cavity, and the taste can be improved. Moreover, continuous manufacture is possible using a general cigarette hoist, and an industrially advantageous smoking article can be realized.

The filter unit 15 includes a core unit 31 positioned on the center side, and a sheath unit 32 positioned outside the core unit 31 and having a ventilation resistance larger than the ventilation resistance of the core unit 31. According to this configuration, a large amount of air containing smoke can be flowed to the core portion 31 side, and conversely, the flow rate of air containing smoke can be reduced on the sheath portion 32 side. Accordingly, it is possible to prevent the air flow flowing through the sheath portion 32 from acting and pushing the air flowing in the oblique direction with respect to the central axis A through the opening portion 17 in the central axis A direction. As a result, the smoke diffusion effect can be obtained more reliably.

Each of the plurality of opening portions 17 has a bottom portion 17C reaching the core portion 31, and is exposed to the outside at a portion corresponding to the sheath portion 32 in the end face 22A. According to this configuration, the aperture portion 17 can collect air at the core portion 31 where the flow rate of air containing smoke is large, and the amount of smoke diffusion can be increased by increasing the flow rate of air passing through the aperture portion 17. Can be increased. Further, since the opening portion 17 is exposed to the outside at a position corresponding to the sheath portion 32 having a large ventilation resistance, the air flow in the oblique direction passing through the opening portion 17 flows through the sheath portion 32 in the vicinity of the end face 22A. Therefore, it can be prevented that the liquid is pushed away in the direction of the central axis A. Thereby, a desired smoke diffusion effect can be exhibited in the oral cavity.

The angle formed by the opening 17 and the central axis A is 30 ° or more and 60 ° or less. According to this configuration, for example, it is possible to prevent a situation where a wide-angle diffusion effect of smoke cannot be obtained, as in the case where the angle formed by the opening portion 17 and the central axis A is about 20 °. Conversely, the bottom portion 17C of the opening portion 17 is too close to the end face 22A, as in the case where the angle formed by the opening portion 17 and the central axis A is larger than 60 °. The ventilation resistance between 17C and the end face 22A does not decrease too much. Accordingly, it is possible to prevent the smoke from easily flowing along the direction of the central axis A, and to increase the flow rate of air that flows through the opening portion 17 in an oblique direction with respect to the central axis A. Thereby, smoke can be uniformly diffused at a wide angle in the oral cavity.

The ratio of the airflow resistance of the core portion 31 to the airflow resistance of the sheath portion 32 is 0.02 or more and 0.46 or less. According to this configuration, air containing smoke can be actively flowed through the core portion 31, and the flow rate of air passing through the sheath portion 32 can be reduced. Thereby, the amount of smoke diffused can be increased by increasing the flow rate of air collected by the core portion 31 and passing through the opening portion 17. Further, it is possible to prevent the air flow in the oblique direction passing through the opening portion 17 from being pushed away in the direction along the central axis by the air flow passing through the sheath portion 32. Thereby, the desired smoke diffusion effect can be obtained and the taste can be improved.

The diameter of the core part 31 is 25% or more and 50% or less of the diameter of the filter part 15. In the smoking article of this embodiment, the ventilation resistance of the core portion 31 is smaller than the ventilation resistance of the sheath portion 32. For this reason, the air containing smoke mainly flows through the core portion 31. According to said structure, the diameter of the core part 31 can be made into half or less with respect to the diameter of the filter part 15. FIG. For this reason, the same effect as reducing the cross-sectional area of the filter part 15 is exhibited, and the flow velocity of the air flowing through the core part 31 can be increased. As a result, the flow rate of the air collected at the core portion 31, passing through the opening portion 17 and then flowing out in an oblique direction with respect to the central axis A can be increased. Thus, a sufficient smoke diffusion effect can be obtained in the oral cavity.

(Second embodiment of smoking article)
Subsequently, a second embodiment of the smoking article will be described with reference to FIG. The smoking article of the second embodiment is applied to a smoking tool that sucks the flavor of cigarettes without heating. Here, parts different from the first embodiment will be mainly described, and description of parts common to the first embodiment will be omitted. In FIG. 45, the upper half of the smoking tool is shown cut by a plane passing through the central axis A.

As shown in FIG. 45, the smoking tool 51 includes a cigarette part 12 composed of chopped leaves (cigarettes), cylindrical first filter parts 15A and second filter parts 15B adjacent to the cigarette part 12, and a cigarette part. 12, a cylindrical resin cover portion 52 that covers the first filter portion 15A and the second filter portion 15B. The first filter portion 15 A has a suction port 22. The cover 52 has the suction port 21 at one end.

The first filter portion 15 can be appropriately set with a diameter of 5 mm to 9 mm, for example, and in the present embodiment, has a cylindrical shape with a diameter of 8 mm, for example. The first filter portion 15 includes a cylindrical core portion 31 positioned on the center side in the radial direction, a cylindrical sheath portion 32 disposed outside the core portion 31, and an adjacent surface 33 adjacent to the tobacco portion. , And an end face 22A opposite to the adjacent face 33. The diameter of the core part 31 with respect to the diameter of the filter part 15 is set like each Example mentioned later. The ventilation resistance of the core portion 31 is set to be different from the ventilation resistance of the sheath portion 32. Specifically, the ratio of the airflow resistance of the core portion 31 to the airflow resistance of the sheath portion 32 is set as in each example of the first embodiment.

The plurality of apertures 17 are provided so as to be exposed to the outside at a portion corresponding to the sheath portion 32 in the end face 22A, and are arranged, for example, in a single ring shape (or radial shape). The plurality of apertures 17 may be arranged in a ring shape in a plurality of rows. For example, a plurality of circular apertures 17 are arranged, for example, at equal intervals in one row of rings. Specifically, the number of apertures 17 is set as in each example of the first embodiment.

Each of the plurality of opening portions 17 includes a first portion 17A provided in the sheath portion 32, a second portion 17B provided in the core portion 31, and a bottom portion 17C. The depth (length) of the opening 17 is set as in each example of the first embodiment. The opening portion 17 is provided so as to form an angle θ with the central axis A of the first filter portion 15. The depth (length) of the opening portion 17 and the angle at which the opening portion 17 is provided can be appropriately set, for example, at 1 ° or more and 89 ° or less. It is set as in each embodiment.

45, the basic structure of the smoking tool 51 of the second embodiment is the same as the cigarette 11 of the first embodiment shown in FIG. Therefore, when smoke observation and image analysis are performed on the smoking tool 51 of the second embodiment under the same conditions as those of Comparative Example 1-6 and Example 1-24 of the first embodiment, the first embodiment Similar results can be obtained.

Also in this embodiment, the effect of uniformly diffusing smoke (air containing tobacco flavor from the filter unit 15) in the oral cavity can be expected in the same manner as in the first embodiment and Examples 1-24 thereof. , The taste can be further improved.

(Filter embodiment)
With reference to FIG. 46, embodiment of the filter used by attaching to a smoking article is described. Although this filter is different from the smoking article itself, the structure of the applied aperture is the same as that of the embodiment of the smoking article. For this reason, a different part from the structure of the smoking article of 1st Embodiment is mainly demonstrated, and description is abbreviate | omitted about the part which is common in 1st Embodiment. In FIG. 46, the upper half of the filter is shown cut by a plane passing through the central axis A.

The filter 61 is configured to be attachable to and detachable from a smoking article, for example, the above-described general cigarette 11 (cigarette without an opening portion). The filter 61 includes a resin-made cylinder part 62 attached to one end of a smoking article (cigarette 11), a columnar filter part 15 provided on the inner side of the cylinder part, and the vicinity of the inlet 22 And a plurality of opening portions 17 provided in the cylindrical portion 62.

The filter unit 15 can be appropriately set with a diameter of 5 mm to 9 mm, for example, and in the present embodiment, for example, has a cylindrical shape with a diameter of 8 mm. The filter portion 15 includes a cylindrical core portion 31 positioned on the center side in the radial direction, a cylindrical sheath portion 32 disposed outside the core portion 31, an adjacent surface 33 adjacent to the tobacco portion 12, And an end face 22 A opposite to the adjacent face 33. The diameter of the core part 31 with respect to the diameter of the filter part 15 is set like each Example of 1st Embodiment. The ventilation resistance of the core portion 31 is set to be different from the ventilation resistance of the sheath portion 32. Specifically, the ratio of the airflow resistance of the core portion 31 to the airflow resistance of the sheath portion 32 is set as in each example of the first embodiment.

Each of the plurality of opening portions 17 includes a first portion 17A provided in the sheath portion 32, a second portion 17B provided in the core portion 31, and a bottom portion 17C. The depth (length) of the opening 17 is set as in each example of the first embodiment. The opening portion 17 is provided so as to form an angle θ with the central axis A of the filter portion 15. The depth (length) of the opening portion 17 and the angle at which the opening portion 17 is provided can be appropriately set, for example, at 1 ° or more and 89 ° or less. It is set as in each embodiment.

As shown in FIG. 46, the basic structure of the filter 61 of the present embodiment is the structure around the filter of the cigarette 11 of the first embodiment shown in FIG. 1 (structure including the filter unit 15, chip paper 16, etc.). It is the same. Therefore, with respect to the filter 61 of this embodiment, when smoke is observed and image analysis is performed under the same conditions as those of Comparative Example 1-6 and Example 1-24 of the first embodiment, the same as in the first embodiment Result can be obtained. In these observation / analysis / evaluation, a general cigarette 11 is attached to the filter 61. Smoking conditions are the same as in the first embodiment.

That is, according to this embodiment, similar to the first embodiment and its Example 1-24, it is possible to expect the effect of diffusing air including smoke in the oral cavity and the flavor of cigarettes coming out of the filter, and the taste is further improved. it can.

Further, the smoking article (cigarette 11, smoking tool) and the filter 61 are not limited to the above-described embodiment and each example, and can be embodied by modifying the constituent elements without departing from the scope in the implementation stage. For example, some constituent elements may be deleted from all the constituent elements shown in the embodiments and examples, or constituent elements in different embodiments and examples may be appropriately combined.

DESCRIPTION OF SYMBOLS 11 ... Cigarette, 12 ... Cigarette part, 15 ... Filter part, 17 ... Opening part, 17C ... Bottom part, 22A ... End face, 31 ... Core part, 32 ... Sheath part, 51 ... Smoking tool, 61 ... Filter, 62 ... Tube Part, A ... central axis

Claims

Tobacco part,
A filter part provided adjacent to the cigarette part and having an end face on the opposite side of the cigarette part;
A plurality of apertures that are provided in the filter part so as to be exposed to the outside at the end face, and are inclined with respect to the central axis so as to be away from the central axis of the filter part as approaching the end face;
Smoking article comprising.
The filter section is
A core portion located on the center side;
A sheath part located outside the core part and having a ventilation resistance larger than the ventilation resistance of the core part;
The smoking article according to claim 1, comprising:
The smoking article according to claim 2, wherein each of the plurality of opening portions has a bottom portion reaching the core portion, and is exposed to the outside at a portion corresponding to the sheath portion in the end face.
The smoking article according to claim 3, wherein an angle formed by the aperture and the central axis is 30 ° or more and 60 ° or less.
The smoking article according to claim 4, wherein a ratio of the airflow resistance of the core part to the airflow resistance of the sheath part is 0.02 or more and 0.46 or less.
The smoking article according to claim 5, wherein the diameter of the core part is 25% or more and 50% or less of the diameter of the filter part.
A cylinder attached to one end of the smoking article;
A filter part provided on the inner side of the cylindrical part and having an end face on the opposite side to the face facing the smoking article;
A plurality of apertures that are provided in the filter part so as to be exposed to the outside at the end face, and are inclined with respect to the central axis so as to be away from the central axis of the filter part as approaching the end face;
With a filter.