JP2017099287A - Filter for smoking article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter for a smoking article enabling a smoker to adjust easily fragrance inhaling taste.SOLUTION: There is provided a filter for a smoking article in which a solution 3 containing propylene glycol, glycerol and a thickener is unevenly distributed in the filter. In the filter for the smoking article, a length of such a portion that a cross section ratio of a portion to which the solution is added on the circumferential direction cross section of the filter for the smoking article is 10-80 area% constitutes 20-100% of a length in the axial direction of the filter for the smoking article.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a filter for a smoking article used for a smoking article such as a cigarette with a filter.

As a means for changing the flavor of cigarettes, there is known a method of arranging a liquid transport material having a plurality of domains in the filter and retaining the fragrance in the domain (for example, Patent Document 1). The technology describes that a polymer matrix is used as a liquid transport material, and that the smoker crushes the matrix during use to release the fragrance contained in the polymer matrix, thereby changing the savory taste during smoking. Has been.
A technique in which the structure of the filter is divided into at least two zones (filter zone, zone for increasing flavor) is also known (Patent Document 2). And the aspect which the zone which increases the flavor has a fragrance | flavor is described.

In addition, when using cigarettes with a filter, research and development have been conducted to give the filter a function of removing only unnecessary components during smoking among the components contained in cigarette smoke. As means for achieving this, there is known a method in which a solution or the like in which a material for adjusting components contained in cigarette smoke is dissolved is added to a filter (for example, Patent Documents 3 to 5).
Patent Document 3 describes an aqueous liquid composition containing a polysaccharide and having a viscosity in a specific range as a nicotine reducing agent for reducing nicotine contained in cigarette smoke. In addition, there is a description relating to a nicotine-reducing smoking device having a filter portion holding the nicotine-reducing agent.
In Patent Document 4, a filter section to which liquid fatty acid ester or liquid fatty acid having a specific viscosity is added, a filter section to which glycol (for example, propylene glycol) having a specific viscosity is added, and activated carbon is added to the downstream side of these filter sections. A cigarette filter having a filtered section is described. It is described that, with such a configuration, the components in the target smoke are filtered more efficiently than adding each configuration to the filter alone.
Patent Document 5 describes a cigarette having a homogeneous mixture of a polyol ester such as triacetin and a polyol such as propylene glycol inside the filter. In the technique described in Patent Document 5, a carbonaceous material is contained in order to remove some gas phase components contained in cigarette smoke, and the above-mentioned gas phase filtration performance of such a carbonaceous material is improved. The inclusion of a homogeneous mixture is described.

International Publication No. 2013/068304 US Pat. No. 5,115,823 Japanese Patent No. 3882125 Japanese Patent No. 3910175 Special table 2009-507518

In the invention described in Patent Document 1, it is necessary to form a bead-shaped matrix by mixing a fragrance solution and a polymer matrix solution in advance and adding a crosslinking agent thereto, and the matrix is incorporated into the filter. There are many steps because it is necessary.
In the invention described in Patent Document 2, the zone that increases the flavor in the filter has a fragrance, but the smoker cannot adjust the release of the fragrance that the zone has.
The nicotine reducing agent described in Patent Document 3 is not described with respect to stability after being added to the filter.
The technique described in Patent Document 4 does not describe storage stability of a filter to which a specific solution is added, and a component that tends to volatilize such as propylene glycol is lost during storage of the filter.
In the technique described in Patent Document 5, it is only a carbonaceous material (for example, activated carbon) that is included for the purpose of adjusting the gas phase component in the tobacco smoke, and the addition of polyol ester or polyol is only the carbon. This is to improve the air permeability of the quality material.

  As described above, with the techniques described in each patent document, it is difficult to manufacture the filter, and the smoker cannot easily adjust the savory taste when smoking. Moreover, about the solution added to a filter in order to change a flavor, a component may volatilize during storage or may leak out of the smoking article.

  In the present invention, the smoker can easily adjust the flavor and suppress the reduction of propylene glycol added to the filter to selectively remove some of the components contained in the tobacco smoke even after storage. And a filter for a smoking article capable of maintaining a good appearance.

  As a result of intensive studies by the present inventors, a solution containing propylene glycol, glycerin and a thickener is unevenly distributed in the filter, and the solution in the circumferential cross section of the filter for smoking articles is added. A filter for a smoking article in which the length of the part where the cross-sectional ratio of the part is 10 to 80 area% constitutes 20 to 100% of the axial length of the filter for a smoking article can solve the above problem. As a result, the present invention has been reached.

That is, the present invention is as follows.
[1] A filter for smoking articles in which a solution containing propylene glycol, glycerin, and a thickener is unevenly distributed in the filter,
The length of the part where the cross-sectional ratio of the part to which the solution is added in the circumferential section of the filter for smoking articles is 10 to 80% by area is 20 to 100% of the axial length of the filter for smoking articles. A filter for a smoking article.
[2] The filter for smoking articles according to [1], wherein the filter has a double structure including a core part and an outer edge part, and the solution is added to the core part.
[3] The filter for smoking articles according to [2], wherein the solution is added to 20% or more of the volume of the core part of the double structure part.
[4] The filter for smoking articles according to [2] or [3], wherein the double structure part has a double concentric structure.
[5] The filter for smoking articles according to any one of [2] to [4], wherein the density of the core and the outer edge of the filter is different.
[6] The filter for smoking articles according to any one of [2] to [5], wherein a circumferential sectional area of the core portion is 10 to 70% of a sectional area of the filter for smoking articles.
[7] The filter for smoking articles according to any one of [2] to [6], wherein an impermeable material for the solution exists at a boundary between a core portion and an outer edge portion of the filter.

  ADVANTAGE OF THE INVENTION According to this invention, the smoker can provide the filter for smoking articles which can adjust a savory taste easily. Further, according to the present invention, even after storage, the reduction of propylene glycol added to the filter to selectively remove some of the components contained in the tobacco smoke is suppressed, and the appearance of the filter is improved. Can keep good.

It is a figure which shows the example of the circumferential direction cross section of the filter for smoking articles to which the solution was added. It is a figure which shows the state after a smoker swallows the filter for smoking articles of FIG. It is the schematic which shows the example of the filter for smoking articles to which the solution was added.

  Hereinafter, the present invention will be described in detail with reference to embodiments, examples, etc., but the present invention is not limited to the following embodiments, examples, etc., and can be arbitrarily set within the scope of the present invention. Can be changed and implemented.

<Filter for smoking articles of the present invention>
The filter for smoking articles of this invention can use a well-known material suitably. For example, what uses acetate tow as a material can be mentioned. The single yarn fineness, total fineness, and cross-sectional shape of acetate tow are not particularly limited. In any material, adjustment of ventilation resistance and addition of additives (known adsorbents, fragrances, fragrance holding materials, etc.) can be designed as appropriate.
In addition, when the filter for smoking articles of this invention has a double concentric structure so that it may mention later, the density of the filter of a center part and an outer edge part can be changed suitably.

<Filter structure>
In the filter for smoking articles of the present invention, a solution containing propylene glycol, glycerin and a thickener is added so as to be unevenly distributed in the filter. As an aspect thereof, for example, as shown in FIGS. 1A to 1C, the smoking article filter is unevenly distributed in the circumferential cross section, and such a cross section (the solution in the smoking article cross section is added). An aspect in which a surface having an area ratio (hereinafter also referred to as a solution distribution occupation ratio) of 10 to 80 area%) constitutes 20 to 100% of the axial length of the filter for smoking articles can be mentioned. .
The area (solution distribution occupancy) of the section where the solution is added in the circumferential section of the filter for smoking articles is 10 to 80%, more preferably 20 to 60%. By constituting 20 to 100% of the axial length of the filter for smoking articles, when the smoker swallows the filter, the solution moves outward in the circumferential direction in the filter. Thus, the area where the mainstream smoke and the solution come into contact with each other during smoking can be adjusted. By this adjustment, the savory taste at the time of smoking can be adjusted.
In addition, as a shape of the filter for smoking articles of this invention, a well-known shape can be employ | adopted and the aspect which has a cylindrical shape normally illustrated by FIG. 3 can be mentioned. As the size thereof, the length in the axial direction can be 17 to 40 mm, and the length (diameter) in the circumferential direction can be 5 to 8.5 mm.

Examples of the uneven distribution of the solution in the circumferential section of the filter include a circular aspect (a) centering on the same point as the center of the circumferential section as shown in FIGS. Examples include a circular mode (b) centering on a point different from the center of the directional cross section, and an irregular shape (c) that is not circular.
In addition, a circle having the shape and position as described above is continuously present in the axial direction of the filter for the smoking article, for example, for smoking articles such as (d) to (f) in FIG. A filter is formed.
(D) of FIG. 3 is the aspect by which the said solution is added to the circle centering on the same point as the center of the circumferential direction cross section of the filter for smoking articles, and this surface is continuing in parallel with an axial direction. . In this aspect, in the filter for smoking articles, the region to which the solution is added exists as a cylinder parallel to the axial direction.
(E) of FIG. 3 is the aspect to which the said solution was added by circular shape in the circumferential direction cross section of the filter for smoking articles. In this aspect, although the area | region where the said solution was added to the axial direction exists continuously, it has a part which was not parallel to the axial direction but inclined with respect to the axial direction.
(F) of FIG. 3 is the aspect to which the said solution was added in irregular shape in the circumferential direction cross section of the filter for smoking articles. In this aspect, although the area | region where the said solution was added to the axial direction exists continuously, it has a part which was not parallel to the axial direction but inclined with respect to the axial direction. Moreover, the area of the area | region where the said solution was added in the both ends of the axial direction of the filter for smoking articles is different.

3 (d) to (f) show 100% (the solution is added to both ends) as a proportion of the axial length of the region to which the solution is added. If it occupies a short aspect, for example, 20% or more, the flavor can be adjusted.
Although not shown, in FIGS. 1 and 3, in the circumferential cross section of the filter for smoking articles, the region to which the solution is added is unevenly distributed in one place, but if the above-mentioned area requirements are satisfied, You may be unevenly distributed in two or more places of the cross section of the circumferential direction.

In the embodiment described in FIGS. 1 and 2, the arrangement of the region to which the solution is added in the filter for smoking articles has been described. In order to realize such an arrangement, in the present invention, a core part (also referred to as a core part) to which the solution in the filter for smoking articles is added, and an outer edge part (also referred to as a sheath part) covering the periphery thereof are provided. An embodiment of a filter that originally has a double structure composed of In this embodiment, the solution is added to the site constituting the core of the double structure.
The filter having a double structure may have the same or different material or density for the core and outer edge. For example, by increasing the density of the core part and decreasing the density of the outer edge part to provide a density difference, the solution can be easily diffused from the core part to the outer edge part due to the swallowing of the smoker's filter.
Furthermore, in the embodiment having such a double structure, those having a double concentric structure as shown in FIG. 1 (a) or FIG. 3 (d) are preferable from the viewpoint of ease of production. Even when the filter for smoking articles of the present invention has a double concentric structure, the material and density of the filter may be different between the core and the outer edge. When the density is different such as a filter having a higher density at the core and a lower density at the outer edge, diffusion of the solution from the core to the outer edge is facilitated.
For example, when the filter for smoking articles of the present invention has a double structure composed of a core part and an outer edge part, when the density of the filter constituting the core part is 1, the density of the filter constituting the outer edge part The aspect which is 0.1-1 can be mentioned. This range is more preferably about 0.3 to 0.8.
This relationship is the same even when the filter for smoking articles of the present invention has a double concentric structure.
About the density of a filter, it can adjust by changing the material to be used or changing the addition density | concentration of a plasticizer.
Moreover, when the filter for smoking articles of this invention has the double structure comprised from the core part and outer edge part like a double concentric structure, about each volume, when a core part is set to 1, 0. The aspect of 25-9 can be mentioned.
When the filter for smoking articles of the present invention has a double structure composed of a core part and an outer edge part, such as a double concentric structure, the circumferential cross-sectional area of the core part is the cross-sectional area of the filter for smoking articles. The aspect which is 10 to 80% of can be mentioned.

Moreover, when the filter for smoking articles of this invention has a double structure, it is 20-10 of a core part.
An embodiment in which the solution is added to 0% by volume can be mentioned. When the said solution is added to 80 volume% or more of a core part, it is suitable for adjustment of a flavor.
At this time, the aspect to which the said solution is added over the whole circumferential cross section of a core part (100% of the circumferential cross-sectional area of a core part) is preferable.

  When the filter for smoking articles of the present invention has a double structure, the acetate tow of the core part has a single yarn fineness of 2 to 10 denier and a total fineness of 10,000 to 40,000 denier. Examples of the material include a single yarn fineness of 2 to 10 denier and a total fineness of 5000 to 40,000 denier. The size relationship of the single yarn fineness between the core portion and the outer edge portion is preferably an embodiment where the core portion> the outer edge portion, and the size relationship between the total fineness of the core portion and the outer edge portion is preferably an embodiment where the core portion <the outer edge portion.

  The filter for a smoking article of the present invention is obtained by swallowing a smoker before smoking and / or smoking, so that, for example, the solution added as shown in (a) to (c) of FIG. As indicated by the arrows (2) of (a ′) to (c ′), the smoking article diffuses in the circumferential direction of the filter. Thereby, when a smoker smokes, the area where the mainstream smoke comes into contact with the solution can be easily adjusted by a simple operation of swallowing the filter. And thereby, a savory taste can be adjusted to a smoker's desired thing.

<Solution added to filter>
The said solution added to the filter for smoking articles of this invention contains propylene glycol, glycerol, and a thickener.
By containing propylene glycol in the solution, a predetermined component contained in the smoke during smoking, such as phenol, can be selectively removed during smoking. On the other hand, for example, limonene, which is one of the aromatic components, passes through the filter without being removed. A commercially available propylene glycol can be used.
Moreover, it can prevent that the propylene glycol contained in the said solution volatilizes and lose | disappears during storage of a smoking article because glycerin is contained in the said solution. Commercially available glycerin can be used.
Furthermore, since the thickener is contained in the solution, the solution can be prevented from moving out of the filter and leaking out and diffusing from the region where the solution is added to the periphery thereof, thereby The appearance of the smoking article can be kept good, and the quality of the product during storage can be prevented.
In other words, the use of the solution defined in the present invention suppresses the reduction of propylene glycol added to the filter in order to selectively remove some of the components contained in the tobacco smoke even after storage. At the same time, the appearance is kept good.
The type of thickener can be used without particular limitation as long as it is soluble in propylene glycol or glycerin. For example, xanthan gum, gellan gum, psyllium seed gum, pectin, carboxymethylcellulose, hydroxypropylcellulose, polyvinyl Mention may be made of alcohol, agarose, pullulan, alginic acid, polyacrylic acid, and alkali metal salts or alkaline earth metal salts thereof.

The aspect which is 10-200 mg / filter as the quantity per smoking article can mention the quantity of the propylene glycol after adding to a filter. When the amount of propylene glycol is in this range, selective removal of specific components in tobacco smoke during smoking is ensured. If the amount of propylene glycol exceeds 200 mg / filter, it becomes difficult to add all of the solution to the filter.
Moreover, about glycerin, the aspect which is 1-150 mg / filter can be mentioned as an amount after adding per smoking article. By being 1 mg / filter or more, reduction due to volatilization of propylene glycol can be prevented. On the other hand, the upper limit amount of glycerin is determined from the viewpoint of securing a good suction feeling (not increasing the airflow resistance too much).
Furthermore, about a thickener, although it changes also with the kind, when gellan gum is used, the aspect which is 0.045-100 mg / filter can be mentioned as quantity per smoking article, for example. Moreover, when xanthan gum is used, the aspect which is 0.3-100 mg / filter can be mentioned as quantity per smoking article.

The proportion of each component contained in the solution at the time of addition to the filter can be 3 to 75% by weight for propylene glycol and 0.4 to 66% by weight for glycerin. On the other hand, the thickener may vary depending on the type, but an embodiment of 0.01 to 87% by weight in the solution can be mentioned. Water can be mentioned as another component contained in the solution.
In the filter of the present invention, in order to sufficiently remove unnecessary components in the tobacco smoke, the solution added to the filter is adjusted so that the propylene glycol content in the smoking article after storage is 10 to 200 mg / filter. It is possible to adjust the concentration of each component.

  The method for adding the solution to the filter is not particularly limited, and a known method can be used. The said solution contained in a filter can mention the aspect which is 50-250 mg / filter.

When the filter for smoking articles of the present invention has a double structure of a core part and an outer edge part, a material such as a film exists at the boundary between the core part to which the solution is added and the outer edge part surrounding the periphery. Embodiments can be mentioned. In such an aspect, it is possible to better prevent the solution from leaking to the outer edge during stable storage of the smoking article using the smoking article filter of the present invention.
Moreover, it is preferable that the material arrange | positioned at a boundary not only makes it difficult to diffuse the said solution, but it is easily destroyed by the swallowing of the smoker's filter.
Examples of the material disposed at the boundary of the solution include glassine paper, cellophane, polyethylene, polypropylene, and aluminum.
These materials can be used alone, a combination of these materials, or a combination of these materials and a base material made of paper or a polymer compound.
The impermeable material for the solution is preferably a film having a film thickness of 5 to 65 μm. This film thickness can be changed as appropriate according to the type of material used, thereby ensuring the impermeability of the solution and being easily destroyed by swallowing the smoker.

The filter for smoking articles of this invention can be used for various smoking articles, for example, can be used as a filter of a cigarette with a filter.
When used as a filter of a cigarette with a filter, the filter can be wound with a known wrapping paper. Examples of such wrapping paper include molding paper, chip paper, and winding paper.
Moreover, about the tobacco rod connected to a filter, a well-known material is used and it connects to the filter of this invention by a well-known method.
The tip paper may be provided with ventilation holes for adjusting the ratio of the mainstream smoke and air that are inhaled during smoking. There is no restriction | limiting in particular about arrangement | positioning of a ventilation hole, The aspect arrange | positioned so that it may become 1 row or 2 rows in the circumferential direction of a cigarette can be mentioned. Moreover, there is no restriction | limiting in particular also about the pitch of a ventilation hole, the magnitude | size of a hole, and the opening method.

The present invention will be described more specifically with reference to examples, but the present invention does not exceed the gist thereof.
It is not limited to the description of the following examples.

<Example 1>
1. Preparation of cigarette with filter to which solution was added (1) Preparation of filter addition solution The filter addition solution was prepared with a predetermined amount of propylene glycol (PG; manufactured by Wako Pure Chemical Industries, Ltd., food additive grade), glycerin (G; Add Hokupure Pharmaceutical Co., Ltd. (special grade reagent), ultrapure water, xanthan gum (X; MRC Polysaccharide Co., Ltd., XG300), red food (food color red, Kyoritsu Foods Co., Ltd.) TK Homomixer MarkII f Model, motor output 200 W, maximum 12,000 rpm) for 30 minutes at room temperature to prepare an xanthan gum powder that is not visually confirmed.
The composition ratio in the filter addition solution was 24.5% by weight of ultrapure water, 51.46% by weight of propylene glycol, 22.05% by weight of glycerin, 0.03% by weight of red food, and 1.96% by weight of xanthan gum. It should be noted that the food red is added to inspect the addition range of the solution and does not affect the effect of the present technology.

(2) Preparation of the solution addition filter The solution addition filter is a double-layered solution consisting of acetate tow with a single yarn fineness of 8.6 denier and a total fineness of 21000 denier, and a sheath with acetate tow of single yarn fineness of 5.0 denier and total fineness of 35000 denier. A concentric filter (Nippon Filter Industry Co., Ltd.) cut to a length of 15 mm was used. Cut the filter web with a cutter (Feather Safety Shave Blade, Feather Shave Blade S), separate the core and sheath, and separate the solution prepared as in (1) into the separated core. The surface solution was wiped off with Kimwipe (Nippon Paper Crecia Co., Ltd., Wiper S200), and the amount of the added solution was adjusted to 150 mg / 15 mm. A weight measuring device (METTLER TOLEDO, PB303) was used to measure the amount of the added solution. The core part filter to which the solution was added was wrapped with a separated sheath part and a web, and the cut part was adhered with an adhesive tape (Scotch, BP-12).
The ratio of the circumferential sectional area of the core part to the circumferential sectional area of the entire filter was 18%, and the ratio of the length having the sectional area to the axial length of the filter was 56%.

(3) Preparation of cigarette equipped with a solution addition filter Cigarette equipped with a solution addition filter is a commercially available Mobius Superlite 100'S (tar 6 mg, nicotine 0.5 mg) cutter (feather safety shaving company, feather razor) After separating the engraved filling part and filter part with S single blade) and removing the engraved side filter (charcoal filter part) and the web, insert the filter prepared in (2) and attach the cut part to the adhesive tape (Scotch, BP-12).

2. Filter sag strength and filter addition solution diffusion test (1) Solution addition filter sag test
1. The rheometer (Sun Science Co., Ltd., CR-3000EX) is the solution addition filter prepared in (2).
The stagnation strength was defined by crushing the fixed distance filter using the, and shaking the distance level. Regarding the measurement conditions and test levels, the tests were conducted under the following conditions and levels.

(2) Filter solution infiltration area confirmation test
1. Cut the solution addition filter prepared in (2) to 10mm length and expand the solution infiltrating area of the cross section 30 times using a microscope (Keyence, VHX-5000). The area was measured.
The solution infiltration area was 25.0 mm ² (N = 5 average value), and the ratio in the circumferential cross-sectional area of the filter was 53.8% (N = 5 average value). 18% of the cross-sectional area ratio in the circumferential direction of the filter core
On the other hand, the ratio of the cross-sectional area in the circumferential direction of the filter solution infiltration area was 53.8%. This occurs because the solution on the side surface of the core part adheres to the sheath part when preparing the solution addition filter, and is not due to natural diffusion and penetration of the solution. We have investigated the natural diffusion and penetration of the solution, and confirmed that the filter solution infiltration area does not change immediately after the preparation of the solution addition filter and after storage for 2 weeks (storage environment: temperature 22 ° C, humidity 60%) .
After measuring the solution infiltration area, use it for the test of (1). After the test, measure the solution infiltration area of the filter cross section again with a microscope, and measure the increase in the solution infiltration area in the filter cross section before and after the test of (1) did. As a result, the area increased by 2.7 to 14.6%, and the ratio in the circumferential sectional area of the filter became 56.5 to 68.4%.

3. Sensory evaluation of flavor change before and after filter soaking (1) Preparation of filter solution-free filter and filter solution-added filter solution The filter-free filter core has an acetate tow with a core of 8.6 denier and a total fineness of 21,000 denier. Used was a double concentric filter (manufactured by Nippon Filter Industry Co., Ltd.) made of acetate tow having a single yarn fineness of 5.0 denier and a total fineness of 35000 denier cut to a length of 15 mm.
The entire solution addition filter is a double concentric filter consisting of acetate tow with core fineness of 8.6 denier and total fineness of 21000 denier, sheath with single yarn fineness of 5.0 denier and total toughness of 35000 denier acetate tow (Nippon Filter Industrial Co., Ltd.) For products using a product cut to a length of 15 mm. The solution prepared in (1) was added dropwise by adding 150 mg / 15 mm uniformly so that there was no difference in the amount of solution added per volume between the core and sheath. A weight measuring machine (METTLER TOLEDO, PB303) was used for the measurement of the added volume.

(2) Preparation of cigarette with solution-free filter Cigarette with solution-free filter is a commercially available Moebius Superlite 100
'S (tar 6mg, nicotine 0.5mg) is separated with a cutter (Feather Safety Shaved Blades, Feather Shaving Blade S single blade), and the filler and filter parts are separated, and the filler (charcoal filter part) and web are removed. After that, the solution-free filter prepared in (1) was inserted, and the cut portions were bonded with an adhesive tape (Scotch, BP-12).

(3) Preparation of cigarette equipped with a solution full surface addition filter Cigarette equipped with a solution full surface addition filter is a commercially available Mobius Superlite 100'S (tar 6 mg, nicotine 0.5 mg) cutter (Feather Safety Shaved Blade, Feather) Use a razor blade (single blade) to separate the engraved part and filter part, remove the engraved side filter (charcoal filter part) and web, and then insert the entire surface solution addition filter prepared in (1) and bond the cut part. Bonded with tape (Scotch, BP-12).

(4) Flavor change sensory evaluation method (3), 3. (2), 3. Using the cigarette prepared in (3), sensory evaluation was performed on the flavor before and after the filter squeezing for 19 in-house smokers. First, for evaluators, 3. (2), 3. Each cigarette prepared in (3) was allowed to smoke. Then 1. 2. Smoking one cigarette without stagnation and one with stagnation in the cigarette prepared in (3). Cigarette prepared in (2) and 3
. 1. When the difference in flavor of the cigarette prepared in (3) is 5, The difference in taste (miscellaneous taste, little irritation) of the cigarette prepared with (3) without stagnation of the cigarette and with stagnation was relatively evaluated. As a result, The difference in the flavor of the cigarette prepared in (3) without the stagnation of the cigarette and the cigarette with the stagnation was 3.3. The result that a savory taste changes by swallowing the filter part of the cigarette prepared in (3) was obtained.

  In the filter for smoking articles of the present invention, a solution having a specific composition is unevenly distributed in the filter. The solution does not diffuse in the filter when the smoking article is not used, but diffuses into the filter by the smoker rubbing at an arbitrary timing, so that the flavor can be changed to suit the smoker's preference.

DESCRIPTION OF SYMBOLS 1 Filter outer edge part 2 Filter core part 3 Area | region where the solution diffused 4 Axial direction 5 Circumferential direction

Claims (7)

A filter for smoking articles in which a solution containing propylene glycol, glycerin and a thickener is unevenly distributed in the filter,
The length of the part where the cross-sectional ratio of the part to which the solution is added in the circumferential section of the filter for smoking articles is 10 to 80% by area is 20 to 100% of the axial length of the filter for smoking articles. A filter for a smoking article.   The filter for smoking articles according to claim 1, wherein the filter has a double structure composed of a core part and an outer edge part, and the solution is added to the core part.   The filter for smoking articles according to claim 2, wherein the solution is added to 20% or more of the volume of the core part of the double structure part.   The filter for smoking articles according to claim 2 or 3, wherein the double structure portion has a double concentric structure.   The filter for smoking articles according to any one of claims 2 to 4, wherein the density of the core portion and the outer edge portion of the filter is different.   The filter for smoking articles according to any one of claims 2 to 5, wherein a circumferential sectional area of the core part is 10 to 80% of a sectional area of the filter for smoking articles.   The filter for smoking articles according to any one of claims 2 to 6, wherein an impermeable material for the solution is present at a boundary between a core portion and an outer edge portion of the filter.