Filter containing gel-like additive, flavor inhalation article including said filter, and flavor inhalation article package

Abstract

A filter for a flavor inhalation article, the filter having a filtration material including a biodegradable ingredient, and a rolled paper wound around the filtration material, the filtration material containing a gelled additive having a phenol filtration function.

Description

[Technical Field]

[0001] The present invention relates to a filter containing a gel-like additive, a flavor inhalation article including the filter, and a flavor inhalation article package. [Background technology]

[0002] Acetate fiber has traditionally been widely used as a filter material in smoking articles such as filter cigarettes. In recent years, in order to reduce environmental impact, the use of degradable materials as filter materials in various products has been promoted, and the use of biodegradable materials such as paper filters as filter materials in smoking articles has also been considered. However, paper filters have poorer filtering performance for irritating substances such as phenols than filters using acetate fiber, and tend to produce a harsh taste. Therefore, attempts have been made to impart the ability to filter irritating substances such as phenols to paper filters, thereby improving flavor.

[0003] For example, Patent Document 1 discloses a filter to which triacetin is added to reduce phenol. However, since filters to which liquid is added are prone to liquid leakage during storage, Patent Document 1 discloses that cellulose acetate is added to reduce leakage. Patent Document 2 reports that oil stains on filter media for smoking articles can be reduced by using a granular adsorbent formed by agglomerating a powdered material containing oils and fats in a granular base material such as powdered sugar or crystalline cellulose via a polyol. Patent Document 3 discloses a technique of adding an additive that is solid at room temperature, such as polyethylene glycol or high molecular weight methoxypolyethylene glycol, to a filter in order to remove semi-volatile compounds such as phenol. Patent Document 4 reports a technique for improving flavor and reducing leakage of liquid from a filter by adding a phenol scavenger with a dropping point of 50°C or higher to the filter. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2019 / 149742 [Patent Document 2] International Publication No. 2018 / 008608 [Patent Document 3] Special Publication No. 2013-526272 [Patent Document 4] International Publication No. 2021 / 001961 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the technology of Patent Document 1 cannot sufficiently prevent leakage of liquid during storage, and liquid may leak from the filter into the wrapping paper or tipping paper. Furthermore, in Patent Document 2, although the use of a granular additive can suppress leakage of liquid, there is room for improvement in terms of the flavor imparted to the user when used in a flavor inhalation article. In Patent Document 3, a solid additive is added to the filter material and then heated and melted, making it difficult to add it uniformly, and also making it less easy to handle since heating is performed after winding up. In Patent Document 4, a semi-solid additive is used, but the additive is added to the filter in a molten state or in a fluid state by heating. Therefore, the additive may bleed into the wrapper between the time it is added to the filter and the time it solidifies, and it is desirable to solve this problem. Furthermore, although the flavor is practical, there is room for improvement. Therefore, there is a demand for achieving both the effect of suppressing liquid leakage and the effect of improving flavor, and for further improvement.

[0006] An object of the present invention is to provide a filter for a flavor inhalation article that can sufficiently filter out phenol to improve flavor and that is less likely to leak liquid during storage. [Means for solving the problem]

[0007] As a result of intensive research to solve the above problems, the present inventors have found that by using a gel-like additive as an additive having phenol filtering ability, phenol can be sufficiently filtered out to improve flavor, and leakage of liquid caused by the additive can be suppressed even after storage, and have completed the present invention. That is, the gist of the present invention is as follows.

[0008] [1] A filter for a flavor inhalation article, comprising: The filter includes a filter medium containing a biodegradable material and a wrapper around which the filter medium is wrapped. The filter, wherein the filter medium contains a gel-like additive having phenol filtering ability. [2] the gel-like additive having phenol filtering ability contains two or more compounds selected from the group consisting of polyethylene glycol, polypropylene glycol, polybutylene glycol, polyethylene glycol sorbitan fatty acid ester, polypropylene glycol glyceryl ether, polyglycerin fatty acid ester, propylene glycol, diglycerin, caprylyl glycol, propylene glycol fatty acid ester, glycerin fatty acid ester, sorbitan fatty acid ester, sucrose fatty acid ester, triethyl citrate, fatty acid, fatty acid alkyl ester, phospholipid, hydroxy fatty acid, and hyercin rapeseed extremely hardened oil; The filter according to [1], wherein one or more of the two or more compounds is a component having phenol filtering ability selected from the group consisting of polyethylene glycol, polypropylene glycol, polybutylene glycol, polyethylene glycol sorbitan fatty acid ester, polypropylene glycol glyceryl ether, polyglycerin fatty acid ester, propylene glycol, diglycerin, caprylyl glycol, propylene glycol fatty acid ester, glycerin fatty acid ester, sorbitan fatty acid ester, sucrose fatty acid ester, triethyl citrate, fatty acid, fatty acid alkyl ester, and phospholipid. [3] The filter according to [2], wherein the weight-average molecular weight of the polypropylene glycol is 2,000 or more and 4,000 or less, and the weight-average molecular weight of the polypropylene glycol glyceryl ether is 3,000 or more and 4,000 or less. [4] The filter according to [2], wherein the component having phenol filtering ability is one or more selected from the group consisting of polypropylene glycol glyceryl ether, polyglycerin fatty acid ester, glycerin fatty acid ester, fatty acid, and fatty acid alkyl ester. [5] The filter according to any one of [1] to [4], wherein the wrapper has a liquid-repellent layer in an area that comes into contact with the filter medium. [6] The spreading area of ​​the component having phenol filtering ability on the liquid-repellent layer is 35 mm 2 The filter according to [5], which is: [7] The paper wrapper further comprises a substrate; The filter according to [5] or [6], wherein the liquid-repellent layer is disposed on the surface of the substrate. [8] The filter according to any one of [5] to [7], wherein the liquid-repellent layer contains one or more materials selected from the group consisting of starch, polyvinyl alcohol, acrylic resin, fluororesin, aluminum, polypropylene, polyethylene, paraffin, silicone, cellulose nanofiber, ethyl cellulose, gum arabic, and nitrocellulose. [9] The filter according to any one of [5] to [7], wherein the liquid-repellent layer contains one or more selected from the group consisting of ethyl cellulose, acrylic resin, paraffin, polyethylene, polypropylene, fluororesin, and silicone.

[10] The filter according to any one of [5] to [7], wherein the liquid-repellent layer is liquid-repellent paper.

[11] The filter according to any one of [1] to

[10] , which has a phenol filtering capacity represented by the following formula (i) of 0.83 or less: Phenol filtering capacity = DPR1 / DPR0 (i) DPR1: A value obtained by dividing the amount of phenol in the tobacco smoke passing through the filter by the amount of particulate matter in the tobacco smoke passing through the filter when a smoking test is conducted using the filter. DPR0: A value obtained by dividing the amount of phenol in the tobacco smoke passing through a standard filter, which has the same composition as the above filter but does not contain the gel-like additive having phenol filtering ability, by the amount of particulate matter in the tobacco smoke passing through the standard filter, when a smoking test is conducted using the standard filter.

[12] a tobacco rod wrapped in rolling paper; A filter according to any one of [1] to

[11] , a tipping paper connecting the tobacco rod and the filter; A flavor inhalation article comprising:

[13] The flavor inhalation article according to

[12] , wherein at least one of the wrapping paper and the tipping paper has a colored portion.

[14] A flavor inhalation article package in which a flavor inhalation article is enclosed in an inner wrapper, The flavor inhalation article is the flavor inhalation article according to

[12] or

[13] , the flavor inhalation article is directly wrapped in the inner wrapper, A flavor inhalation article package, wherein a liquid-repellent layer is provided at least in the area of ​​the inner wrapper that comes into contact with the filter.

[15] The flavor inhalation article package according to

[14] , wherein the liquid-repellent layer provided on the inner wrapper contains one or more selected from the group consisting of starch, polyvinyl alcohol, acrylic resin, fluororesin, aluminum, polypropylene, polyethylene, paraffin, silicone, cellulose nanofiber, ethyl cellulose, gum arabic, and nitrocellulose.

[16] The flavor inhalation article package according to

[14] , wherein the liquid-repellent layer provided on the inner wrapper contains one or more materials selected from the group consisting of ethyl cellulose, acrylic resin, paraffin, polyethylene, polypropylene, fluororesin, and silicone.

[17] The flavor inhalation article package according to

[14] , wherein the liquid-repellent layer provided on the inner wrapper is liquid-repellent paper. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a filter for a flavor inhalation article that can sufficiently filter out phenol to improve the flavor and that is less likely to cause leakage of liquid during storage. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 3 is a schematic view showing a first configuration example of a flavor inhalation article according to a second embodiment of the present invention. [Figure 2] FIG. 4 is a schematic view showing a second configuration example of a flavor inhalation article according to a second embodiment of the present invention. [Figure 3] FIG. 10 is a schematic view showing a third configuration example of the flavor inhalation article according to the second embodiment of the present invention. [Figure 4] 1 is a graph showing the spreading area of ​​polypropylene glycol glyceryl ether (PPG-GE) for each test material. [Figure 5] 1 is a graph showing the spreading area of ​​diglycerin for each test material. [Figure 6] 1 is a graph showing the phenol filtration ability of cigarette samples prepared in the examples. [Figure 7] 1 is a graph showing the relationship between the phenol filterability and the score of the sensory evaluation of flavor of cigarette samples prepared in the examples. DETAILED DESCRIPTION OF THE INVENTION

[0011] The present invention will be described in detail below by showing embodiments and examples, but the present invention is not limited to the following embodiments and examples, and can be modified and implemented as desired within the scope that does not deviate from the gist of the present invention. In this specification, when a numerical value or physical property value is enclosed by "~", the values ​​before and after the "~" are included. Furthermore, when a numerical range is described with a lower limit and an upper limit separately, the numerical range can be a combination of any of the lower limit and upper limit values.

[0012] 1. Filter A first embodiment of the present invention is a filter for a flavor inhalation article, which comprises a filter medium containing a biodegradable material and a wrapper paper around which the filter medium is wrapped, and the filter medium contains a gel-like additive having phenol filtering ability.

[0013] 1-1. Filter form and shape The form of the filter is not particularly limited, and may be a plain filter including a single filter segment, a multi-segment filter including multiple filter segments such as a dual filter or triple filter, etc. When the filter according to this embodiment is a multi-segment filter, it is sufficient that at least one filter segment has a filter medium to which a gel additive has been added. According to the filter of this embodiment, even if it is a filter made of a single filter segment, it is possible to sufficiently improve the flavor and suppress leakage of liquid.

[0014] The shape of the filter is not particularly limited, and any known shape can be adopted. Usually, the filter is cylindrical, and the following forms can be used. The filter may also be provided with a section such as a cavity or recess that is hollow (hollow) in cross section in the circumferential direction.

[0015] The cross-sectional shape of the filter in the direction perpendicular to the long axis is substantially circular, and the diameter of the circle can be changed appropriately depending on the size of the product, but is usually 4.0 mm or more, preferably 4.5 mm or more, more preferably 5.0 mm or more, and usually 9.0 mm or less, preferably 8.5 mm or less, more preferably 8.0 mm or less. If the cross-section is not circular, the above diameter is assumed to be the diameter of a circle having the same area as the cross-section, and the diameter of that circle is applied. The circumferential length of the cross section perpendicular to the long axis of the filter can be changed appropriately according to the size of the product to be used, but is usually 14.0 mm or more, preferably 15.0 mm or more, more preferably 16.0 mm or more, and is usually 27.0 mm or less, preferably 26.0 mm or less, more preferably 25.0 mm or less. The length of the filter in the longitudinal direction can be changed appropriately according to the size of the product, but may be 5 mm or more, 10 mm or more, 15 mm or more, 17.5 mm or more, or 20.0 mm or more, and may be 40 mm or less, 35 mm or less, 32.5 mm or less, or 30.0 mm or less.

[0016] The air resistance per 120 mm in the axial direction of the filter is not particularly limited, but is usually 100 mmH2O or more, preferably 150 mmH2O or more, more preferably 200 mmH2O or more, and is usually 800 mmH2O or less, preferably 700 mmH2O or less, more preferably 600 mmH2O or less.

[0017] The airflow resistance of a filter is measured according to the ISO standard method (ISO 6565), using, for example, a Cerulean filter airflow resistance measuring device. Filter airflow resistance refers to the air pressure difference between the first and second end faces of the filter when a specified air flow rate (17.5 mL / s) is applied from one end face (first end face) to the other end face (second end face) without air permeation through the sides of the filter. It is generally expressed in mmH2O. It is known that the relationship between filter airflow resistance and filter length is proportional within the commonly used length range (5 mm to 200 mm), meaning that doubling the length doubles the filter's airflow resistance.

[0018] 1-2.Filter media The filter according to this embodiment has a filter medium containing a biodegradable material. Biodegradable materials are decomposed by microorganisms, resulting in a low environmental impact. Examples of biodegradable materials include cellulose, polylactic acid, poly(3-hydroxybutyrate-co-3-hydroxyhexanoate), polylactic acid / polycaprolactone copolymer, polyglycolic acid, polylactic acid / polyether copolymer, butanediol / long-chain dicarboxylic acid copolymer, polybutylene adipate terephthalate, polytetramethylene adipate terephthalate, polyethylene terephthalate succinate, polybutylene succinate, polybutylene succinate adipate, and polyvinyl alcohol, with cellulose being particularly preferred. Filters using cellulose-containing filter medium are also called paper filters.

[0019] The filter material containing cellulose is typically paper made of wood pulp. The type of wood pulp is not particularly limited, and pulp from coniferous trees, broad-leaved trees, etc. can be used. The type of paper used in the filter is not particularly limited, and gathered paper, pleated paper, crimped paper, crepe paper, nonwoven fabric, shredded paper, etc. can be used. The paper manufacturing method may be either wet or dry, and can be selected arbitrarily. Paper filters have the advantage of being more easily biodegradable than synthetic fiber tows such as cellulose acetate tow.

[0020] The form of the filter material is not particularly limited, and examples thereof include a form in which fibrous filter material is aggregated or a form in which sheet-like filter material is aggregated. In particular, in the case of a paper filter, for example, a form in which paper having a corrugated structure with multiple valleys and ridges is aggregated is exemplified. When paper having a corrugated structure is used, the longitudinal direction of the valleys (or ridges) is arranged parallel to the longitudinal axis direction of the filter rod. When a paper having the above-mentioned wavy structure is used as the filter material paper constituting the paper filter, the average distance from valley to valley or from ridge to ridge of the waveform of the above-mentioned paper filter is not particularly limited, but is usually 0.5 mm or more, preferably 1.0 mm or more, and usually 5.0 mm or less, preferably 4.0 mm or less. The average depth of the valleys of the corrugations of the paper filter is not particularly limited, but is usually 0.1 mm or more, preferably 0.2 mm or more, and usually 1.2 mm or less, preferably 1.0 mm or less.

[0021] Paper having a corrugated structure can be produced by subjecting a flat raw material sheet without corrugations to a creping process that forms peaks and valleys. The thickness of the raw material sheet is not particularly limited, but is usually 20 μm or more, preferably 25 μm or more, more preferably 30 μm or more, and is usually 140 μm or less, preferably 130 μm or less, more preferably 120 μm or less. The basis weight of the raw material sheet is not particularly limited, but is usually 20 gsm or more, preferably 25 gsm or more, and usually 120 gsm or less, preferably 80 gsm or less, more preferably 45 gsm or less. The basis weight can be adjusted by adjusting the pulp content and the filler content, or by adjusting the processing conditions of the wet paper machine.

[0022] The width of the raw material sheet is not particularly limited, but is usually 50 mm or more, preferably 100 mm or more, more preferably 170 mm or more, and 300 mm or less, preferably 250 mm or less, more preferably 230 mm or less. The width of the raw material sheet refers to the length in the direction perpendicular to the long axis direction in which the peaks and valleys are continuously arranged in the corrugated paper, in other words, the length in the direction perpendicular to the direction corresponding to the long axis direction of the filter medium obtained by processing the corrugated paper.

[0023] 1-3. Gel-type additive with phenol filtering ability The filter medium in this embodiment contains a gel-like additive having phenol filtering ability (hereinafter, simply referred to as "gel-like additive"). By adding the gel-like additive to the filter medium, it is possible to suppress the leakage of liquid more effectively than when the additive having phenol filtering ability is in liquid form. Furthermore, by the filter medium containing this gel-like additive, phenol is removed from smoke, aerosol, etc. passing through the filter, and the flavor can be improved.

[0024] As used herein, the term "gel-like" refers to a state in which the system as a whole exhibits solid-like properties due to the formation of a three-dimensional network structure, resulting in high viscosity and loss of fluidity. Due to intermolecular interactions between components, each component can maintain a state in which it has lost fluidity.

[0025] The gel-like additive is not particularly limited as long as it has phenol filtering ability and is in gel form, but it is preferable that it satisfies the following (I) and (II). (I): Contains two or more compounds (hereinafter also referred to as "component (A)") selected from the group consisting of polyethylene glycol, polypropylene glycol, polybutylene glycol, polyethylene glycol sorbitan fatty acid ester, polypropylene glycol glyceryl ether, polyglycerin fatty acid ester, propylene glycol, diglycerin, caprylyl glycol, propylene glycol fatty acid ester, glycerin fatty acid ester, sorbitan fatty acid ester, sucrose fatty acid ester, triethyl citrate, fatty acid, fatty acid alkyl ester, phospholipid, hydroxy fatty acid, and hyercin rapeseed oil. (II): One or more of the components (A) are components having phenol filtering ability selected from the group consisting of polyethylene glycol, polypropylene glycol, polybutylene glycol, polyethylene glycol sorbitan fatty acid ester, polypropylene glycol glyceryl ether, polyglycerin fatty acid ester, propylene glycol, diglycerin, caprylyl glycol, propylene glycol fatty acid ester, glycerin fatty acid ester, sorbitan fatty acid ester, sucrose fatty acid ester, triethyl citrate, fatty acid, fatty acid alkyl ester, and phospholipid.

[0026] The weight-average molecular weight (Mw) of polyethylene glycol, polypropylene glycol, polybutylene glycol, polyethylene glycol sorbitan fatty acid ester, polypropylene glycol glyceryl ether, and polyglycerin fatty acid ester is not particularly limited and may be, for example, 500 or more and 100,000 or less. From the viewpoint of suppressing ink smearing, which will be described later, the weight-average molecular weight of polypropylene glycol and polypropylene glycol glyceryl ether is preferably 1,000 or more, more preferably 2,000 or more, and even more preferably 3,000 or more, and is preferably 10,000 or less, more preferably 7,000 or less, and even more preferably 4,000 or less.

[0027] The fatty acid moiety in the polyethylene glycol sorbitan fatty acid ester, polyglycerin fatty acid ester, propylene glycol fatty acid ester, glycerin fatty acid ester, sorbitan fatty acid ester, and sucrose fatty acid ester can be, for example, the same as the fatty acids described below, and is preferably a saturated fatty acid. This is because saturated fatty acid esters are less likely to produce unpleasant odors due to decomposition over time even without the addition of an antioxidant such as vitamin E, and are less likely to adversely affect quality and flavor than unsaturated fatty acid esters. Preferred examples of such saturated fatty acid esters include glycerin fatty acid esters such as triacetin and glycerin behenate. The number of fatty acid ester bonds per molecule is not particularly limited, and may be a number that leaves two or more hydroxyl groups in one molecule, a number that leaves one hydroxyl group, or a number that allows all hydroxyl groups to be fatty acid esterified.

[0028] The fatty acid may be either a straight-chain fatty acid or a branched fatty acid, and may be either a saturated fatty acid or an unsaturated fatty acid. The number of carbon atoms in the fatty acid is not particularly limited, but is usually 2 or more, preferably 8 or more, more preferably 12 or more, and is usually 30 or less, preferably 26 or less, more preferably 22 or less. Specific fatty acids include acetic acid, lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, undecenoic acid, palmitoleic acid, oleic acid, linoleic acid, linolenic acid, docosahexaenoic acid, and eicosapentaenoic acid.

[0029] Examples of the fatty acid moiety of the fatty acid alkyl ester include the same fatty acids as those described above, and for the reasons mentioned above, saturated fatty acids are preferred. The alkyl group of the fatty acid alkyl ester may be either a linear alkyl group or a branched alkyl group. The number of carbon atoms in the alkyl group is usually 1 or more, preferably 2 or more, and usually 12 or less, preferably 8 or less, and more preferably 4 or less. Examples of the alkyl group include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, a neopentyl group, an n-hexyl group, an n-heptyl group, an n-octyl group, an n-nonyl group, an n-decyl group, an n-undecyl group, and an n-dodecyl group.

[0030] Hydroxy fatty acids include fatty acids in which a hydroxy group is substituted on the carbon of the aliphatic hydrocarbon group of the above-mentioned fatty acids. The substitution position and number of hydroxy groups are not particularly limited. A suitable hydroxy fatty acid is 12-hydroxystearic acid in which a hydroxy group is substituted on the 12th carbon of stearic acid.

[0031] The phospholipid preferably has one or more ester and / or ether bonds in one molecule, more preferably two or more, in order to obtain high phenol filtering ability. The upper limit of the number of such bonds in the phospholipid is not particularly limited, but is usually 10 or less, and may be 8 or less, 6 or less, or 4 or less. Specific examples of phospholipids include lecithin, particularly soybean lecithin, egg lecithin, and the like.

[0032] The component having phenol filtering ability is preferably one or more selected from the group consisting of polypropylene glycol glyceryl ether, polyglycerin fatty acid ester, glycerin fatty acid ester, fatty acid, and fatty acid alkyl ester, since these exhibit high phenol filtering ability among the above. In addition, in a preferred aspect of this embodiment, the component having phenol filterability itself is liquid under conditions of atmospheric pressure and 25°C (hereinafter, a component having phenol filterability that is liquid under conditions of atmospheric pressure and 25°C may be referred to as a "liquid having phenol filterability").

[0033] At least one of the two or more components (A) is a component having phenol filtering ability, and all of the components may be components having phenol filtering ability. In this embodiment, it is preferred that one or more of the two or more components (A) act as a gelling agent and gel the other components (A). That is, it is preferred that the two or more components (A) have high affinity and generate intermolecular interactions such as hydrogen bonding, van der Waals forces, electrostatic interactions, and π-π interactions. Such intermolecular interactions cause molecules to associate to form a three-dimensional network structure, resulting in gelation and suppressing liquid leakage. Examples of such combinations of components (A) include combinations of oxyalkylene polymers such as polyethylene glycol, polypropylene glycol, polybutylene glycol, polyethylene glycol sorbitan fatty acid ester, polypropylene glycol glyceryl ether, polyglycerin fatty acid ester, propylene glycol fatty acid ester, and glycerin fatty acid ester with components that melt upon heating (e.g., those with a melting point of approximately 50°C to 100°C), such as stearic acid, myristic acid, 12-hydroxystearic acid, and hyercin rapeseed oil. It is also preferable to use a component used as a thickener or gelling agent, such as a glycerin fatty acid ester such as glycerin behenate ester, or a polyglycerin fatty acid ester such as polyglycerin octastearate ester, in combination with an oil such as a glycerin fatty acid ester, a fatty acid, or a fatty acid ester.

[0034] The components having phenol filtering ability exemplified above not only have high phenol filtering ability but can also remove specific components that inhibit or deteriorate flavor, such as phenols other than phenol, such as o-cresol, m-cresol, and p-cresol; pyridines; pyrazines; quinoline; styrene; etc. Therefore, they are also suitable in that they can further improve flavor.

[0035] In this embodiment, the use of a gel-like additive having phenol filtering ability as an additive for removing phenol can reduce leakage of liquid from the filter medium. However, a small amount of liquid may leak from the three-dimensional network structure of the gel-like additive during storage. Even in this case, the amount of liquid leaking from the gel-like additive is small, so the risk of liquid leakage from the filter medium is lower than when the additive having phenol filtering ability is in liquid form. However, as described in detail in "1-5. Rolling Paper," by providing a liquid-repellent layer in the area of ​​the roll that contacts the filter medium, even if the gel-like additive leaks during storage, it is possible to more effectively prevent liquid leakage from the filter medium. In this case, the liquid leaking from the gel-like additive is mainly the liquid component having phenol filtering ability (liquid having phenol filtering ability). Therefore, when the component having phenol filtering ability is liquid, the combination of the component having phenol filtering ability and the liquid-repellent layer is such that the spreading area of ​​the component having phenol filtering ability relative to the liquid-repellent layer (hereinafter, sometimes simply referred to as the "spreading area") is 35 mm 2 The lower limit of the spreading area is not particularly limited, and is usually 5 mm 2 More than 10mm 2 If the spreading area is within the above range, even if the component having phenol filtering ability is a liquid, the liquid can be prevented from diffusing along the surface of the paper roll and leaking out from the end of the paper roll.

[0036] The spreading area of ​​the component with phenol filtering ability on the liquid-repellent layer is measured using the following method. First, 10 mg of the component with phenol filtering ability is dropped onto the liquid-repellent layer using a microsyringe and allowed to stand for 30 minutes in a room at 22°C and 60% RH. Then, using a digital microscope such as Keyence's VHX-100, the component with phenol filtering ability that has spread on the liquid-repellent layer is observed under a microscope. The periphery of the component with phenol filtering ability is manually identified from the image obtained by microscopic observation, and the area of ​​the region surrounded by the identified periphery is calculated as the spreading area.

[0037] The total content of components having phenol filtering ability in component (A) is not particularly limited, but is usually 2% by weight or more, preferably 50% by weight or more, more preferably 65% ​​by weight or more, even more preferably 75% by weight or more, particularly preferably 80% by weight or more, and most preferably 85% by weight or more, and is usually 100% by weight or less, more preferably 98% by weight or less, and even more preferably 95% by weight or less.

[0038] The total content of the gel additive in the entire filter, including the filter material and wrapper, is preferably 1 mg or more, more preferably 5 mg or more, even more preferably 10 mg or more, and is preferably 250 mg or less, more preferably 50 mg or less, even more preferably 30 mg or less. By setting the content of the gel additive within the above range, specific components contained in smoke, aerosol, etc. can be sufficiently removed, and the flavor can be improved. Furthermore, if the content of the gel additive is within the above range, problems such as a significant change in the air resistance of the filter, a significant decrease in the manufacturability of the filter, and liquid leakage outside the filter when pressure is applied to the filter can be avoided.

[0039] The gel additive may contain known additives such as thickeners, fragrances, colorants, etc. The gel additive may also contain impurities such as water, as long as the effects of the present invention are not impaired. Among known additives, thickeners are preferred because they can prevent leakage of liquid caused by the gel additive and enhance the effect of maintaining a good appearance.

[0040] The thickener is not particularly limited as long as it can be retained in the gel-like additive, and examples thereof include xanthan gum, gellan gum, psyllium seed gum, pectin, carboxymethyl cellulose, hydroxypropyl cellulose, polyvinyl alcohol, agarose, pullulan, alginic acid, polyacrylic acid, urethane compounds, and alkali metal salts or alkaline earth metal salts thereof. Of these, carboxymethyl cellulose is preferred as the thickener.

[0041] The content of the thickener in the filter medium varies depending on the type, but is, for example, 0.5 mg / filter to 200 mg / filter. For example, when the thickener is carboxymethyl cellulose, the amount per filter may be 10 mg / filter to 150 mg / filter.

[0042] 1-4. Other additives The filter medium may include a crushable additive-releasing container (also referred to in the art as a "capsule") that includes a crushable outer shell made of activated carbon, gelatin, etc., in addition to the biodegradable material and gel-like additive. When the capsule is broken by a user of the flavor inhalation article before, during, or after use, it releases the additive contained therein, which is then transferred in part or in whole to the airflow passing through the flavor inhalation article while the flavor inhalation article is in use, and transferred to the filter medium after use.

[0043] The form of the capsule is not particularly limited, and may be, for example, a frangible capsule, preferably spherical. The additive contained in the capsule is not particularly limited, and preferably contains a fragrance or activated carbon. The form of the additive is not particularly limited, and is usually liquid or solid, but may contain the above-mentioned gel-like additive. The use of capsules containing additives is well known in the art. Frangible capsules and their manufacturing methods are well known in the art. Furthermore, known fragrances and activated carbon can be used.

[0044] 1-5. Roll paper The filter of this embodiment has a wrapping paper around which the filter material is wrapped. When the filter is a multi-segment filter, the wrapping paper preferably wraps two or more of these segments together. On the other hand, when two or more segments are individually wrapped in wrapping paper, the multiple filter segments may be fixed with forming paper. The material, thickness, weight, etc. of the forming paper are not particularly limited, and the same paper as the wrapping paper can be used. The embodiment of the paper roll is not particularly limited, and may include one or more rows of adhesive-containing seams. The adhesive may include a hot melt adhesive. The adhesive may also include polyvinyl alcohol.

[0045] The material of the wrapping paper is not particularly limited, and known materials can be used. The wrapping paper may also contain a filler such as calcium carbonate. The thickness of the wrapper is not particularly limited, but is usually 20 μm or more, preferably 30 μm or more, and usually 140 μm or less, preferably 130 μm or less, more preferably 120 μm or less. The basis weight of the paper roll is not particularly limited, but is usually 20 gsm or more, preferably 22 gsm or more, more preferably 23 gsm or more, and is usually 100 gsm or less, preferably 95 gsm or less, more preferably 90 gsm or less.

[0046] In this embodiment, the roll paper preferably has a liquid-repellent layer in the area in contact with the filter material. The liquid-repellent layer is a layer that is liquid-repellent to liquids derived from the gel-like additive, particularly liquids among components having phenol filtering ability (liquids having phenol filtering ability). By providing a liquid-repellent layer at a specific position on the roll paper in this way, it is possible to prevent liquid leaking from the gel-like additive during storage from diffusing along the surface of the roll paper, thereby preventing liquid leakage from the end of the roll paper.

[0047] The wrapper may consist of only a liquid-repellent layer, or may have a substrate and a liquid-repellent layer disposed on the surface of the substrate. When the wrapper has a substrate and a liquid-repellent layer disposed on the surface of the substrate, the wrapper may have a coating agent containing a material for forming the liquid-repellent layer laminated on the surface of the substrate by means of application, vapor deposition, or the like, as described below. The substrate is not particularly limited, and examples include known papers used for wrappers, nonwoven fabrics composed of polymer fibers, and the liquid-repellent paper described below.

[0048] The material for forming the liquid-repellent layer can be appropriately selected from polymers, metals, inorganic oxides, and the like. The material for forming the liquid repellent layer may be used alone or in any combination of two or more materials in any ratio.

[0049] Examples of polymers include polysaccharides such as starch, cellulose, acetyl cellulose, ethyl cellulose, nitrocellulose, and gum arabic; paraffin; polyolefins such as polyethylene and polypropylene; polystyrene; polyvinyls such as polyvinyl acetate, polyvinyl chloride, and polyvinyl alcohol; fluororesins such as polytetrafluoroethylene; acrylic resins such as polymethyl acrylate and polymethyl methacrylate; natural rubber; synthetic rubbers such as polybutadiene; silicones such as polydimethylsiloxane; natural resins; alkyd resins; urethane compounds; copolymers thereof; etc. Among polysaccharides, celluloses such as cellulose, acetyl cellulose, ethyl cellulose, and nitrocellulose are preferably used in the form of nanofibers because they exhibit high liquid repellency.

[0050] Examples of fluororesins include those obtained by substituting hydrogen atoms of alkenyl groups or alkyl groups in the main chain or side chain of the above-mentioned polymers such as polystyrene, polyvinyl, acrylic resin, silicone, etc. with fluorine atoms; those having a perfluoroalkylene group or a perfluoroalkyl group; etc. Among these, the fluororesin is preferably one having a perfluoroalkylene group or a perfluoroalkyl group, more preferably one having a perfluoroalkylene group, and even more preferably polytetrafluoroethylene.

[0051] Of the materials mentioned above, the material for forming the liquid-repellent layer is preferably one or more selected from the group consisting of ethyl cellulose, acrylic resin, paraffin, polyethylene, polypropylene, fluororesin, and silicone.

[0052] The metal may include aluminum. Examples of inorganic oxides include silica and alumina.

[0053] The material for forming the liquid-repellent layer can be appropriately selected from the above materials depending on the type of gel additive, and can be a material that exhibits appropriate liquid repellency against liquids that leak from the gel additive, particularly liquids that have phenol filtering ability. For example, when starch and / or aluminum are used as the material for forming the liquid-repellent layer, the liquid having phenol filtering ability contained in the gel additive is preferably a compound with a higher surface tension than polypropylene glycol glyceryl ether, selected from diglycerin, sorbitan mono-fatty acid ester, sorbitan di-fatty acid ester, glycerin mono-fatty acid ester, polyglycerin fatty acid ester, etc. This is because liquids having a high surface tension and phenol filtering ability tend to be less likely to wet and spread on the surface of the paper wrapper, which can prevent the liquid from leaking out of the filter material.

[0054] The surface tension of a liquid with phenol filtering ability against a liquid-repellent layer is measured by the pendant drop method (ds / de method). Specifically, the liquid with phenol filtering ability is extruded from the tip of a vertically downward capillary, and the surface tension is calculated from the shape of the droplet (hanging drop) formed by the liquid with phenol filtering ability. The maximum diameter (equatorial diameter) de of the hanging drop and the diameter ds of the hanging drop at a position de above the lowest point of the hanging drop are used for the calculation.

[0055] Furthermore, when one or more materials selected from the group consisting of starch, polyvinyl alcohol, acrylic resin, fluororesin, aluminum, polypropylene, polyethylene, paraffin, silicone, cellulose nanofiber, ethyl cellulose, gum arabic, and nitrocellulose are used as the material for forming the liquid-repellent layer, the liquid having phenol filtering ability contained in the gel additive is selected from polypropylene glycol, polypropylene glycol glyceryl ether, polybutylene glycol, diglycerin, sorbitan mono-fatty acid ester, sorbitan di-fatty acid ester, glycerin mono-fatty acid ester, polyglycerin fatty acid ester, polyethylene glycol, caprylyl glycol, etc., and the like, and the liquid having phenol filtering ability is selected from the group consisting of ... mono-fatty acid ester, sorbitan di-fatty acid ester, glycerin mono-fatty acid ester, polyglycerin fatty acid ester, polyethylene glycol, caprylyl glycol, etc., and the like, and the liquid having phenol filtering ability is selected from the group consisting of polypropylene glycol, polypropylene glycol glyceryl ether, polybutylene glycol, diglycerin mono-fatty acid ester, sorbitan di-fatty acid ester, glycerin mono-fatty acid ester, polyglycerin fatty acid ester, polyethylene glycol, caprylyl glycol, etc., and the like, and the liquid having phenol filtering ability is selected from the group consisting of polypropylene glycol, polypropylene glycol glyceryl ether, polybutylene glycol, caprylyl glycol, etc., 2 Preferably, the compound is:

[0056] Alternatively, in this embodiment, it is also preferable that the liquid-repellent layer is liquid-repellent paper. Liquid-repellent paper refers to paper whose surface smoothness and density have been controlled by increasing the degree of beating of the raw material or by performing a calendaring process, thereby improving liquid resistance. Examples of liquid-repellent paper include glassine paper.

[0057] From the viewpoint of manufacturability, the liquid-repellent layer is preferably a layer having a uniform thickness throughout, but may be a layer including two or more regions of different thickness. The average thickness of the liquid-repellent layer is not particularly limited and can be appropriately set depending on the type of substrate, the type of liquid-repellent layer, etc. The average thickness of the liquid-repellent layer can be 5 μm or more and 30 μm or less. When the liquid-repellent layer is provided on the surface of the substrate, the ratio of the thickness of the liquid-repellent layer to the thickness of the substrate can be about 0.01 or more and 1.0 or less. Furthermore, when forming the liquid-repellent layer by coating, vapor deposition, or the like, of a coating agent containing a material for forming the liquid-repellent layer, the amount of coating agent applied can be appropriately adjusted so that the liquid-repellent layer has the above-mentioned thickness. As long as there are no problems with liquid repellency or manufacturability, a smaller amount of coating is preferable from the viewpoint of manufacturing costs. However, since there is a risk of liquid leaking from uncoated areas, it is preferable to form the liquid-repellent layer over the entire surface of the substrate.

[0058] Furthermore, when multiple filter segments are fixed with a molding paper, the material, thickness, basis weight, etc. of the molding paper are not particularly limited, and examples thereof include those similar to those of the wrapping paper. The above-mentioned liquid-repellent layer may be provided on at least a part of the molding paper.

[0059] 1-6. Phenol filtration capacity The filter of this embodiment can sufficiently remove phenol, and its phenol removal performance can be evaluated by the phenol filtration capacity represented by the following formula (i): Phenol filtering capacity = DPR1 / DPR0 (i) DPR1: A value obtained by dividing the amount of phenol in the tobacco smoke passing through the filter by the amount of particulate matter in the tobacco smoke passing through the filter when a smoking test is conducted using the filter. DPR0: A value obtained by dividing the amount of phenol in the tobacco smoke passing through a standard filter, which has the same composition as the above filter but does not contain the gel-like additive having phenol filtering ability, by the amount of particulate matter in the tobacco smoke passing through the standard filter, when a smoking test is conducted using the standard filter.

[0060] The phenol filtration capacity of the filter of this embodiment is preferably 0.83 or less, more preferably 0.70 or less, even more preferably 0.60 or less, and particularly preferably 0.50 or less, since a smaller value results in a better flavor when used in a flavor inhalation article. The lower limit of the phenol filtration capacity of the filter of this embodiment is not particularly limited and is usually 0 or more, and may be 0.10 or more, 0.20 or more, 0.30 or more, or 0.40 or more.

[0061] The phenol filtering capacity represented by the formula (i) is calculated by the following steps (1) to (8). (1) A filter according to this embodiment (filter to be evaluated) and a tobacco rod are connected with tipping paper to prepare a cigarette sample. (2) The cigarette samples are automatically smoked using an automatic smoking machine (e.g., Cerulean SM410), and the total particulate matter (TPM) in the cigarette smoke is collected using a glass fiber filter (e.g., Cambridge filter "Borgwaldt 44 mmφ"). The automatic smoking conditions are, for example, a puff volume of 17.5 mL / sec, a puff time of 2 sec / puff, a puff frequency of 1 puff / min, and a butt length of 35 mm. (3) The difference in mass of the glass fiber filter before and after smoking is calculated as the amount of TPM captured. (4) After collection, phenol is extracted from the glass fiber filter with an extraction solvent such as tert-butyl methyl ether. The extract is analyzed by gas chromatography-mass spectrometry (GC-MSD) to determine the amount of phenol in the tobacco smoke. For GC-MSD, an Agilent G7890A (manufactured by Agilent Technologies Inc.) and an Agilent 5795C (manufactured by Agilent Technologies Inc.) can be used. (5) The amount of phenol in the cigarette smoke is divided by the amount of TPM to obtain the phenol filterability for one measurement. (6) (1) to (5) are carried out three times, and the average of the phenol filtering capacities obtained in (5) is designated as DPR1. (7) The average of the phenol filtering abilities obtained in the same manner as in (1) to (6) above is defined as DPR0, except that a reference filter having the same configuration as the filter according to this embodiment but not containing a gel-like additive having phenol filtering ability is used instead of the filter according to this embodiment. (8) Calculate the phenol filtering capacity by dividing DPR1 obtained in (6) above by DPR0 obtained in (7) above. However, in the above steps, the particulate matter in tobacco smoke collected by one glass fiber filter may be from one cigarette sample, or from multiple cigarette samples of the same type, for example, two cigarettes.

[0062] 1-7. Filter manufacturing method The manufacturing method of filter is not particularly limited, and can be manufactured by known methods.For example, when filter is a paper filter, it can be manufactured by the method of using the paper obtained by papermaking wood pulp to form a filter rod.Specifically, for example, paper filter can be manufactured by the following steps: creping the paper obtained by papermaking, etc., to make the paper corrugated; assembling the paper with the corrugated structure obtained to make a filter material; wrapping the obtained filter material with a roll paper to make a rod-shaped long filter; and cutting this rod-shaped long filter to a desired length. The gel additive can be added to the filter medium at any stage, for example, after the step of forming corrugated paper, before the step of preparing a rod-shaped long filter, or after the step of preparing a rod-shaped long filter.

[0063] As the paper machine, conventionally known machines such as a cylinder paper machine, an inclined short wire paper machine, a Fourdrinier paper machine, a short wire paper machine, etc. can be used, and a combination of paper machines can be used appropriately depending on the required properties. In addition, dry manufacturing methods such as resin-bonded nonwoven fabrics, thermal-bonded nonwoven fabrics, and spunlace nonwoven fabrics can also be used appropriately.

[0064] Filters other than paper filters can be manufactured by forming a material into a sheet and then manufacturing the filter according to the above-mentioned paper filter manufacturing method. Alternatively, filters can be manufactured by gathering fibrous material, wrapping it in a wrapping paper, forming it into a rod, and cutting it to the desired length.

[0065] The addition of a gel-like additive to a filter medium is carried out by first preparing the gel-like additive and then applying the obtained gel-like additive to the filter medium and / or paper before it is formed into the filter medium (hereinafter, in the explanation of the filter manufacturing method, these may be simply referred to as "filter medium").

[0066] The gel additive can be prepared by mixing two or more components (A) and, if necessary, additives such as a thickener, a flavoring, or a coloring. The mixing method is not particularly limited, and for example, all components may be mixed simultaneously using a reactor or shaker equipped with a stirrer or stirring blades, or the components may be mixed in any order. The mixing conditions are also not particularly limited, and mixing may be performed at 50°C to 120°C for 5 minutes to 1 hour. Alternatively, a mixture containing two or more components (A) may be added to the filter medium before complete gelation, and then the temperature may be lowered and the mixture may be maintained for a period of 1 minute to 1 hour to complete the gelation.

[0067] The method of adding the gel-like additive to the filter material is not particularly limited, and known methods can be used.Specific examples include liquid delivery or spraying using a pressure pump; application using a coating roller, brush, etc.; etc.When the gel-like additive-forming solution is added to the filter material after the process of producing a rod-shaped long filter, the gel-like additive-forming solution can be added to the filter material of the rod-shaped long filter using a microsyringe.In addition, when the filter material constituting the filter is made of multiple materials, the gel-like additive-forming solution can be added to some of the materials, or can be added to all of the materials.In addition, the gel-like additive-forming solution can be added to a part of the filter material, or can be added approximately uniformly throughout. Alternatively, the gel additive may be heated before addition to give the gel additive fluidity and then added to the filter medium.

[0068] The amount of the gel-like additive-forming solution to be added is not particularly limited, but is, for example, an amount such that the amount of gel-like additive formed by gelation is 1 mg to 250 mg per 10 mm of the filter. Note that the "10 mm" in "per 10 mm of the filter" refers to 10 mm in the longitudinal direction of the filter.

[0069] 2. Flavor suction article A second embodiment of the present invention is a flavor inhalation article comprising a tobacco rod wrapped in cigarette paper, a filter according to the first embodiment of the present invention, and tipping paper connecting the tobacco rod and the filter.

[0070] In this specification, the term "flavor inhalation article" is a general term for inhalation articles that allow a user to enjoy flavors such as tobacco flavors. More specifically, flavor inhalation articles include combustion-type flavor inhalation articles that provide a user with a flavor by burning a flavor source; non-combustion-heating-type flavor inhalation articles that provide a user with a flavor by heating a flavor source without burning it; and non-combustion-non-heating-type flavor inhalation articles that provide a user with a flavor generated from a flavor source without heating or burning the flavor source.

[0071] 2-1.Tobacco rod The tobacco rod is not particularly limited as long as it has a known form, but typically has a form in which a tobacco filler is wrapped in cigarette paper. The tobacco filler is not particularly limited, and known materials such as tobacco shreds and reconstituted tobacco sheets can be used. In this specification, cigarette paper refers to paper used to wrap the tobacco filler, and is distinguished from cigarette paper, which is paper used to wrap a filter material.

[0072] The moisture content of a typical tobacco filler, such as tobacco shreds, contained in a tobacco rod can be 10% by weight or more and 15% by weight or less, and preferably 11% by weight or more and 13% by weight or less. Such a moisture content suppresses the occurrence of stains on the roll and improves the suitability for rolling when producing a flavor inhalation article. When the flavor inhalation article is a non-combustion heating-type flavor inhalation article, the tobacco filler may contain an aerosol base. The aerosol base is a base that generates an aerosol when heated, and examples of the aerosol base include glycerin, propylene glycol, and mixtures thereof.

[0073] The material of the cigarette paper around which the tobacco filler is wrapped is not particularly limited, and any known material can be used, and the cigarette paper may contain a filler such as calcium carbonate. Furthermore, at least a part of the wrapper paper may be provided with a liquid-repellent layer similar to the liquid-repellent layer that may be provided on the wrapper paper of the filter according to the first embodiment of the present invention.

[0074] 2-2.Tipping Paper The material of the tipping paper connecting the tobacco rod and the filter is not particularly limited, and any known material can be used. The tipping paper may also contain a filler such as calcium carbonate. Furthermore, at least a part of the tipping paper may be provided with a liquid-repellent layer similar to the liquid-repellent layer that may be provided on the wrapper paper of the filter according to the first embodiment of the present invention.

[0075] When at least one of the cigarette paper and the tipping paper has a colored portion, if a liquid derived from the gel-like additive seeps out or leaks from the filter material during storage, the ink used in the colored portion will bleed, and the bled ink will further fall off (hereinafter also referred to as "ink smearing"), significantly impairing the appearance of the flavor inhalation article. On the other hand, the flavor inhalation article according to this embodiment suppresses leakage of the liquid derived from the gel-like additive, thereby preventing ink smearing and maintaining an excellent appearance. Therefore, the flavor inhalation article according to this embodiment can be suitably applied to an embodiment in which at least one of the cigarette paper and the tipping paper has a colored portion.

[0076] An example of a flavor inhalation article according to this embodiment will be described below with reference to the drawings, but the present invention is not limited to the following aspects and can be modified as appropriate within the scope of the present invention.

[0077] 1 to 3 are schematic diagrams of combustion-type flavor inhalation articles (cigarettes) in which the filter is a plain filter or a multi-segment filter. In FIG. 1, each filter segment made of a filter medium 2 is wrapped with wrapping paper 4 to form a filter 7. In the case of a multi-segment filter as shown in FIGS. 2 and 3, all of the filter segments wrapped with wrapping paper 4 are wrapped with forming paper 5 to form the filter 7. Furthermore, the filter 7 is connected to a tobacco rod 1 by tipping paper 6.

[0078] The filter according to the first embodiment of the present invention is capable of improving flavor and suppressing liquid leakage, even when it is composed of a single filter segment as shown in Figure 1. That is, the filter according to the first embodiment of the present invention may be adjacent to the tobacco rod. On the other hand, when the filter is a multi-segment filter, it is believed that by adding a gel additive only to the filter segment that is not in contact with the tobacco rod among two or more filter segments, it is possible to more effectively prevent the seepage or leakage of liquid originating from the gel additive into the tobacco shreds and cigarette paper that constitute the tobacco rod. Specifically, a preferred embodiment is one in which a gel additive is added to one filter segment marked with an "*," and a preferred embodiment is one in which a gel additive is added to the filter segment that constitutes the end on the mouthpiece side (Figure 2). In addition, when there are three or more filter segments, an embodiment is also possible in which a gel additive is added only to the filter segment that does not contact the tobacco rod and does not constitute the end on the mouthpiece side, that is, the filter segment that constitutes the middle in the axial direction (Figure 3).

[0079] In this embodiment, as shown in Figures 1 to 3, the filter segments are not limited to those that are continuously present in the axial direction, but there may also be an embodiment in which there are no filter segments other than those that contact the mouth end of the filter, that is, an embodiment in which there are gaps (also called cavities) between the filter segments. The cavities can be formed by molding the above-mentioned molding paper or tipping paper into a cylindrical shape, but in this case, the molding paper or the like that forms the cavity does not necessarily need to have a liquid-repellent layer.

[0080] The tipping paper in this embodiment can be provided with ventilation holes for adjusting the ratio of mainstream tobacco smoke to air inhaled during smoking (shown by dotted lines on the tipping paper indicated by 6 in Figures 1 to 3). The arrangement of the ventilation holes is not particularly limited, and examples include an arrangement in one or two rows in the circumferential direction of the cigarette. Furthermore, the pitch, size, and opening method of the ventilation holes are not particularly limited. The ventilation holes are preferably positioned at a distance of at least 2 mm from the tobacco rod-side end of the filter containing the gel additive toward the tobacco rod. This is expected to improve flavor. Furthermore, from the perspective of preventing liquid leakage, it is preferable that no ventilation holes exist in the tipping paper in the region where the filter containing the gel additive is wrapped and in the region between the two filter segments.

[0081] 3. Flavor inhaler packaging When providing a flavor inhalation article to a user, the flavor inhalation article is usually filled into a package to form a flavor inhalation article package. A third embodiment of the present invention is a flavor inhalation article package in which the flavor inhalation article according to the second embodiment of the present invention is enclosed in an inner wrapper, and the flavor inhalation article is directly packaged in the inner wrapper, and a liquid-repellent layer is provided on at least the area of ​​the inner wrapper that comes into contact with the filter of the flavor inhalation article. In particular, it is preferable that the inner wrapper has a liquid-repellent layer in a portion that comes into contact with the end face of the filter on the mouth side.

[0082] In this embodiment, the additive added to the filter material of the flavor inhalation article filter is in a gel form, making it difficult for liquid to leak from the filter material. Therefore, it is expected that liquid will not easily spread within the flavor inhalation article package. Furthermore, the liquid-repellent layer provided on the inner wrapper in the area that comes into contact with the filter of the flavor inhalation article also prevents liquid leaking from the filter material from wetting and spreading on the surface of the inner wrapper, thereby preventing liquid from spreading within the package.

[0083] The shape and volume of the package for filling the flavor inhalation article of this embodiment are not limited, and conventionally existing packages can be used. The preferred range of the volume of the package is not particularly limited, and may be, for example, 30 cm 3 More than 150cm 3 The following is the result. The number of flavor inhalation articles packed in a package is usually 20, but may be changed as appropriate depending on the shape and size of the package.

[0084] The inner wrapper may consist of only a liquid-repellent layer, or may have a substrate and a liquid-repellent layer disposed on the surface of the substrate. When the wrapper has a substrate and a liquid-repellent layer disposed on the surface of the substrate, the wrapper may be one in which a coating agent containing a material for forming the liquid-repellent layer is laminated on the surface of the substrate by means of coating, vapor deposition, etc. The substrate is not particularly limited, and examples thereof include known paper used for wrappers, nonwoven fabrics made of polymer fibers, and liquid-repellent paper. The liquid-repellent layer on the inner wrapper may be made of the same material as that used to form the liquid-repellent layer on the filter wrapper according to the first embodiment of the present invention, and the same applies to preferred embodiments. A preferred embodiment is also one in which the liquid-repellent layer is liquid-repellent paper. When the filter wrapper has a liquid-repellent layer, the liquid-repellent layer and the liquid-repellent layer on the inner wrapper may be made of the same material, or may be made of different materials. [Example]

[0085] The present invention will be explained in more detail with reference to examples, but the present invention is not limited to the description of the following examples as long as it does not depart from the gist of the invention.

[0086] <Liquid spreading test> In a room at 22°C and 60% RH, 10 mg of a liquid with phenol filterability was dropped onto a test material using a microsyringe, and the spread area of ​​the droplet was measured after 30 minutes. The phenol filterability liquids used in the test were polypropylene glycol glyceryl ether (PPG-GE, weight-average molecular weight 4,000) and diglycerin. The test materials used included plain paper for wrapping, commercially available starch-coated paper, fluororesin (fluororesin containing perfluoroalkyl groups)-coated paper, glassine paper (Yoshiyo Kobo), aluminum foil (Mitsubishi Aluminum), polypropylene film (Sansan Nippon Sha), polyethylene-coated paper (Fukusuke Kogyo), paraffin-coated paper (Kojima Masanao Do Honpo), silicone-coated paper (Nippon Paper Crecia), cellulose nanofiber film (Chuetsu Pulp Industries), nitrocellulose-coated paper, ethylcellulose-coated paper, acrylic resin-coated paper, polyvinyl alcohol-coated paper, and gum arabic-coated paper. The droplets spread across the test material immediately after being dropped, but the spreading of the droplets stabilized after 30 minutes under all conditions except for plain paper.

[0087] The area of ​​the droplet spread on the test material was calculated using image processing. A Keyence VHX-100 digital microscope was used to measure the droplet spread. The digital microscope was set to 5x magnification and focused to a level where the standard scale could be clearly seen. Calibration of the device was performed by specifying the length of a 10mm range of the standard scale using the included software. 10mg of additive was dropped onto an approximately 3cm square test material. After 30 minutes of stabilizing the spread, the test material was imaged from above using the digital microscope. The illumination level was adjusted so that the periphery of the dropped additive droplet was clearly visible. The periphery of the additive droplet was precisely specified using the Measurement - Manual - Polygon mode of the included software, and the spread area was calculated.

[0088] The average values ​​of the spread area and the 95% confidence interval (95% CI) for three measurements are shown in Table 1. The results using PPG-GE are shown in Figure 4, and the results using diglycerin are shown in Figure 5. The dashed lines in Figures 4 and 5 indicate the spread area of ​​36.3 mm 2 (This is the result of the smallest spreading area out of three PPG-GE spreading tests conducted on starch-coated paper.) The position is shown. Table 1 and Figures 4 and 5 show that the test material having a liquid-repellent layer significantly suppresses the spreading of liquid.

[0089] [Table 1]

[0090] <Ink impact test> Using a microsyringe, 10 mg of each of a liquid with phenol filtering ability (described below) and triacetin, a known phenol capture agent, were dropped onto the printed surface of a cork-like chipping paper. After one minute, the liquid was wiped off using a Kimwipe S-200 wiper manufactured by Nippon Paper Crecia Co., Ltd. The degree of ink removal was then evaluated on a four-point scale (A to D). The results are shown in Table 2. A: There is almost no visible ink loss and the appearance is not impaired. B: There is a slight ink loss, but the appearance is not significantly affected. C: Ink has come off and the appearance has been damaged. D: There is significant ink loss and the appearance is significantly damaged.

[0091] The liquids with phenol filtering ability used were polyethylene glycol (weight average molecular weight 600), polypropylene glycol (weight average molecular weight 700, 1,000, 2,000, 3,000), polypropylene glycol glyceryl ether (weight average molecular weight 500, 1,000, 3,000, 4,000), polybutylene glycol (weight average molecular weight 500, 700), diglycerin, and caprylyl glycol.

[0092] [Table 2]

[0093] As shown in Table 2, the impact of ink smearing varied depending on the liquid with phenol filtration ability. Furthermore, it was found that polymers with a higher degree of polymerization (higher weight-average molecular weight) had a smaller impact on ink smearing. It was also found that even if a liquid with phenol filtration ability leaked from a gel additive, it could be sufficiently prevented from seeping or leaking from the filter material. Furthermore, even if a small amount of a liquid with phenol filtration ability used in a gel additive during manufacturing adheres to cigarette paper or tipping paper containing a colored portion, it was confirmed that the appearance of the flavor inhalation product could be prevented from being damaged by ink smearing if the liquid with phenol filtration ability was selected from polypropylene glycol with a weight-average molecular weight of 1,000 or more, polypropylene glycol glyceryl ether with a weight-average molecular weight of 1,000 or more, polybutylene glycol with a weight-average molecular weight of 500 or more, diglycerin, and caprylyl glycol.

[0094] <Phenol filtration ability test> (Cigarette sample preparation) A paper filter with a length of 27 mm and a diameter of 7.7 mm was prepared. Specifically, first, a paper filter with a corrugated surface (basis weight 40 g / m) was prepared. 2 ) was folded to form multiple air flow paths, each extending from one end to the other, wrapped in plain paper, and cut to a length of 120 mm to prepare a filter rod. The airflow resistance of the filter rod was adjusted to 400 mmH2O and the filter diameter to 7.7 mmφ. This filter rod was cut to a length of 27 mm and used as the paper filter of Comparative Example 1, which did not contain any gel-like additive.

[0095] A mixture of the components shown in Table 3 was heated to 90°C and added using a microsyringe to the paper filter of Comparative Example 1, and then the filter was left to stand at room temperature for two days or more to stabilize the distribution of the additive within the filter, resulting in paper filters containing gel-like additives for Examples 1 to 8.

[0096] [Table 3]

[0097] Thereafter, a tobacco rod of a commercially available cigarette "Winston" was joined to the paper filter to prepare cigarette samples of Examples 1 to 8 and Comparative Example 1.

[0098] (Smoking test) For each of the cigarette samples of Examples 1 to 8 and Comparative Example 1, a smoking test and analysis were carried out under the following conditions. Cigarette samples were automatically smoked using an automatic smoking machine (Cerulean SM410) under the following conditions: puff volume 17.5 mL / sec, puff time 2 sec / puff, puff frequency 1 puff / min, butt length 35 mm. Total particulate matter (TPM) in the cigarette smoke was collected using a Cambridge filter (Borgwaldt 44 mm diameter). The amount of TPM was measured by measuring the mass difference of the Cambridge filter before and after smoking. The Cambridge filter was then immersed in 10 mL of the phenol extraction solvent shown in Table 4 below in a screw cap vial and shaken to obtain an analytical sample. A 1 μL aliquot of the resulting analytical sample was collected using a microsyringe and analyzed by gas chromatography-mass selective detector (GC-MSD). An Agilent G7890A GC and an Agilent 5795C MSD were used.

[0099] [Table 4]

[0100] Using the above method, the amount of TPM per cigarette sample and the amount of phenol in the tobacco smoke emitted from each cigarette sample were measured for each cigarette sample. The value obtained by dividing the amount of phenol in the tobacco smoke emitted from each cigarette sample by the amount of TPM per cigarette sample was relative to the value for the cigarette sample of Comparative Example 1, which was set to 1, to evaluate the phenol filtration ability of the paper filters of Examples 1 to 8. The average values ​​of the evaluation results obtained three times are shown in Table 5, and the average values ​​and standard deviations are shown in Figure 6.

[0101] [Table 5]

[0102] 6, it can be seen that filters containing gel-like additives have phenol filtering ability (Examples 1 to 8). It can also be seen that filters with particularly high phenol filtering ability can be obtained by combining polypropylene glycol glyceryl ether (weight-average molecular weight 4,000), a component with phenol filtering ability, with triacetin such as stearic acid or myristic acid, or by using triacetin as a component with phenol filtering ability (Examples 1 to 3 and 6).

[0103] <Sensory evaluation of flavor> The flavor of the cigarettes containing the gel additive was evaluated by sensory evaluation. Specifically, three panelists trained in flavor evaluation smoked the cigarette samples of Comparative Example 1 and Examples 1, 2, and 4 to 7 prepared in the above-mentioned <Phenol Filtering Ability Test>, and evaluated the flavor (irritation) of each Example cigarette sample based on the following scoring criteria. The scores of the three panelists were averaged and rounded to one decimal place to obtain a sensory evaluation score for each cigarette sample. The evaluation results are shown in Table 6. The relationship between phenol filtering ability and the score of the sensory evaluation of flavor is shown in Figure 7.

[0104] (Scoring criteria) 1: No irritation was felt. 2: Significantly reduced irritation compared to the cigarette sample of Comparative Example 1 3: Irritation was reduced compared to the cigarette sample of Comparative Example 1 4: Slightly less irritating than the cigarette sample of Comparative Example 1 5: Sensation equivalent to that of the cigarette sample of Comparative Example 1

[0105] [Table 6]

[0106] From FIG. 7, it can be seen that when the phenol filterability of the cigarette sample to which the gel additive has been added is 0.83 or less, irritation is reduced, and when it is 0.70 or less, irritation is further reduced. [Explanation of symbols]

[0107] 1 tobacco rod 2 Filter media 4 Roll paper 5 Molded paper 6. Tipping Paper 7 Filters

Claims

1. A filter for a flavor inhalation article, comprising: The filter includes a filter medium containing a biodegradable material and a wrapper around which the filter medium is wrapped. The filter medium contains a gel-like additive having phenol filtering ability, The gel-like additive contains either a mixture of one or more compounds selected from the following compound groups (1) and (2), or a mixture of one or more compounds selected from the following compound groups (3) and (4): Filter. Compound group (1): propylene glycol fatty acid esters, glycerin fatty acid esters, oxyalkylene polymers Compound group (2): stearic acid, myristic acid, 12-hydroxystearic acid, hyercin, extremely hardened rapeseed oil Compound group (3): glycerin fatty acid esters, polyglycerin fatty acid esters Compound group (4): fatty acids, fatty acid esters

2. 2. The filter according to claim 1, wherein one or more of the compounds contained in the gel additive are components having phenol filtering ability selected from the group consisting of polyethylene glycol, polypropylene glycol, polybutylene glycol, polyethylene glycol sorbitan fatty acid ester, polypropylene glycol glyceryl ether, polyglycerin fatty acid ester, propylene glycol fatty acid ester, glycerin fatty acid ester, sorbitan fatty acid ester, sucrose fatty acid ester, triethyl citrate, fatty acid, and fatty acid alkyl ester.

3. 3. The filter according to claim 2, wherein the weight average molecular weight of the polypropylene glycol is 2,000 or more and 4,000 or less, and the weight average molecular weight of the polypropylene glycol glyceryl ether is 3,000 or more and 4,000 or less.

4. The component having phenol filtering ability is selected from the group consisting of polypropylene glycol glyceryl ether, polyglycerin fatty acid ester, glycerin fatty acid ester, fatty acid, and fatty acid alkyl ester.

3. The filter according to claim 2, wherein the alkyl ester is one or more alkyl esters selected from the group consisting of alkyl esters.

5. The filter according to claim 1 , wherein the wrapper has a liquid-repellent layer in an area that contacts the filter medium.

6. The spreading area of ​​the component having phenol filtering ability contained in the gel-like additive having phenol filtering ability on the liquid-repellent layer is 35 mm ２ 6. The filter of claim 5, wherein:

7. The paper wrapper further comprises a substrate; The filter according to claim 5 , wherein the liquid-repellent layer is disposed on the surface of the substrate.

8. 6. The filter according to claim 5, wherein the liquid-repellent layer contains one or more materials selected from the group consisting of starch, polyvinyl alcohol, acrylic resin, fluororesin, aluminum, polypropylene, polyethylene, paraffin, silicone, cellulose nanofiber, ethyl cellulose, gum arabic, and nitrocellulose.

9. 6. The filter according to claim 5, wherein the liquid-repellent layer comprises one or more materials selected from the group consisting of ethyl cellulose, acrylic resin, paraffin, polyethylene, polypropylene, fluororesin, and silicone.

10. The filter of claim 5 , wherein the liquid-repellent layer is liquid-repellent paper.

11. 2. The filter according to claim 1, wherein the phenol filtering capacity represented by the following formula (i) is 0.83 or less: Phenol filtering capacity = DPR1 / DPR0 (i) DPR1: A value obtained by dividing the amount of phenol in the tobacco smoke passing through the filter by the amount of particulate matter in the tobacco smoke passing through the filter when a smoking test is carried out using the filter. DPR0: A value obtained by dividing the amount of phenol in tobacco smoke passing through a standard filter, which has the same configuration as the above filter but does not contain the gel-like additive having phenol filtering ability, by the amount of particulate matter in the tobacco smoke passing through the standard filter, when a smoking test is conducted using the standard filter.

12. a tobacco rod wrapped in rolling paper; A filter according to any one of claims 1 to 11; a tipping paper connecting the tobacco rod and the filter; A flavor inhalation article comprising:

13. The flavor inhalation article according to claim 12 , wherein at least one of the wrapping paper and the tipping paper has a colored portion.

14. A flavor inhalation article package in which a flavor inhalation article is enclosed in an inner wrapper, The flavor inhalation article is the flavor inhalation article according to claim 12, the flavor inhalation article is directly wrapped in the inner wrapper, A flavor inhalation article package, wherein a liquid-repellent layer is provided at least in the area of ​​the inner wrapper that comes into contact with the filter.

15. The liquid-repellent layer provided on the inner wrapper is made of starch, polyvinyl alcohol, acrylic resin, fluororesin, aluminum, polypropylene, polyethylene, paraffin, silicone, or the like. The flavor inhalation article package according to claim 14, comprising one or more selected from the group consisting of cellulose, cellulose nanofiber, ethyl cellulose, gum arabic, and nitrocellulose.

16. The flavor inhalation article package according to claim 14, wherein the liquid-repellent layer provided on the inner wrapper paper comprises one or more selected from the group consisting of ethyl cellulose, acrylic resin, paraffin, polyethylene, polypropylene, fluororesin, and silicone.

17. The flavor inhalation article package according to claim 14, wherein the liquid-repellent layer provided on the inner wrapper is liquid-repellent paper.

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