WO2023112153A1

WO2023112153A1 - Non-combustion heated stick

Info

Publication number: WO2023112153A1
Application number: PCT/JP2021/046072
Authority: WO
Inventors: 博之唐来; 和宏野田; 真赤井; 祥子遠藤
Original assignee: 日本たばこ産業株式会社
Priority date: 2021-12-14
Filing date: 2021-12-14
Publication date: 2023-06-22

Abstract

A non-combustion heated stick comprising: a base material part 10 that contains an aerosol source; a cooling part 20 that produces an aerosol by cooling a vapor produced by heating the base material part 10; and a mouthpiece 30 that is positioned at a site through which the aerosol passes, wherein at least one of the cooling part 20 and the mouthpiece 30 contains a silica gel.

Description

Non-combustion heating stick

The present invention relates to non-combustion heating sticks.

Patent Document 1 discloses a cigarette filter material that is useful for selectively and efficiently removing aldehydes (especially formaldehyde) while retaining smoking taste components such as nicotine and tar. The present invention relates to a cigarette filter and a cigarette provided with this cigarette filter. Patent Document 1 describes a cigarette filter material composed of a porous body having an average pore diameter of 5 nm to 350 nm, and describes a silicon element-containing compound, silica gel, etc. as the porous body.

Japanese Patent Publication No. 2001-526059

Non-combustion heating sticks, which generate aerosols by heating a base material containing an aerosol source, have a lower heating temperature for the base material than combustible cigarettes, so the effects of flavor-impairing substances such as aldehydes are limited. has not been considered. However, when the heating temperature is low, it is difficult to reproduce the tobacco-like flavor and taste, and it has become necessary to raise the heating temperature in order to increase the user's satisfaction with the smoking taste.
An object of the present invention is to remove components such as aldehydes that impede smoking taste while maintaining user's satisfaction with smoking taste in a non-combustion heating stick.

The first feature of the present invention completed for this purpose is a base member including an aerosol source, and a cooling unit that cools vapor generated by heating the base member to generate aerosol. and a mouthpiece portion arranged at a portion through which the aerosol passes, wherein at least one of the cooling portion and the mouthpiece portion contains silica gel.
A second feature may be that the silica gel has an amino group as a substituent or forms a complex with an amino compound.
A third feature is that the substituent is represented by the formula (1): NR ₂ —(CH ₂ ) _n — (where each R is independently H, an allyl group, and a is selected from the group consisting of alkyl groups, and n is any integer from 1 to 40).
A fourth feature may be that the amino compound is one or more compounds selected from the group consisting of amino acids, aminosulfonic acids, and polysaccharides having an amino group.
A fifth feature may be that the amino compound is present in the pores of the silica gel.
A sixth feature may be that the silica gel has an average pore size of 5 nm or more and 350 nm or less.
A seventh feature may be that the silica gel has an average particle size of 35 μm or more and 2500 μm or less.
An eighth feature may be that the silica gel has a total nitrogen content of 0.20% by mass or more and 1.00% by mass or less.
A ninth feature may be that the ratio of the amino compound is 0.01 parts by mass or more and 30 parts by mass or less with respect to 100 parts by mass of the silica gel.
A tenth feature may be that the silica gel is present at one or more of any one of the following 1) to 5).
1) inside the filter of the mouthpiece part 2) inside the paper layer of the roll paper on which the filter is wound or on the surface facing the filter 3) inside the hollow part of the mouthpiece part 4) on the surface facing the hollow part 5) the filter In cavities that have multiple segments and are formed between the segments

According to the first feature, it is possible to provide a non-combustion heating stick from which smoking taste-inhibiting components such as aldehydes are preferentially removed while maintaining the user's satisfaction with smoking.
According to the second feature, it is possible to provide a non-combustion heating stick that can selectively reduce smoking taste-inhibiting components such as aldehydes, as compared with the case of using silica gel without amino groups.
According to the third feature, there is provided a non-combustion heating stick that can selectively reduce smoking taste inhibitory components such as aldehydes, as compared with the case of using silica gel without the substituent of formula (1). be able to.
According to the fourth feature, it is possible to provide a non-combustion heating stick that can selectively reduce smoking taste-inhibiting components such as aldehydes, compared to a case where silica gel is not used together with an amino compound.
According to the fifth feature, it is possible to provide a non-combustion heating stick in which smoking taste-inhibiting components such as aldehydes can be selectively reduced compared to when silica gel is not used together with an amino compound.
According to the sixth feature, there is provided a non-combustion heating stick that can selectively reduce smoking taste-inhibiting components such as aldehydes, as compared with the case of using silica gel having an average pore size of 5 nm or more and 350 nm or less. be able to.
According to the seventh feature, there is provided a non-combustion heating stick that can selectively reduce smoking taste-inhibiting components such as aldehydes, compared to the case of using silica gel whose average particle size is not between 35 μm and 2500 μm. be able to.
According to the eighth feature, compared to the case of using silica gel having a nitrogen content of less than 0.20% by mass, a non-combustion heating stick that can selectively reduce smoking taste inhibitory components such as aldehydes. can provide.
According to the ninth feature, it is possible to provide a non-combustion heating stick that can selectively reduce smoking taste-inhibiting components such as aldehydes, as compared with the case of using silica gel without amino groups.
According to the tenth feature, it is possible to provide a non-combustion heating stick that can selectively reduce smoking taste-inhibiting components such as aldehydes, as compared with the case where silica gel is not used.

1 is a view showing a longitudinal section of a non-combustion heating stick according to a first embodiment; FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows typically the structural example of the suction device which concerns on 1st Embodiment. FIG. 5 is a schematic diagram showing a vertical cross section of a mouthpiece portion of a non-combustion heating stick according to another embodiment.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings. In each drawing, the same parts are indicated by the same reference numerals.

<Non-combustion heating stick>
FIG. 1 is a view showing a longitudinal section of a non-combustion heating stick 1 according to the first embodiment. FIG. 2 is a schematic diagram schematically showing a configuration example of the suction device 100 according to the first embodiment.
A non-combustion heating stick (hereinafter sometimes referred to as “stick”) 1 according to the first embodiment includes a base portion 10 , a cooling portion 20 and a mouthpiece portion 30 . The base material portion 10 is formed in a cylindrical shape. Hereinafter, the direction of the centerline CL of the base member 10 may be referred to as the "centerline direction". The stick 1 further includes tip paper 40 that integrates the base material portion 10, the cooling portion 20, and the mouthpiece portion 30 by winding them in order in the direction of the center line. Hereinafter, one end side in the centerline direction (left side in FIG. 1) may be referred to as a first side, and the other end side in the centerline direction (right side in FIG. 1) may be referred to as a second side. The first side is the end side that is inserted into the suction device 100 . The second side is opposite to the first side and is the end side that the user holds in his/her mouth for suction. A cross section along the centerline direction is called a "longitudinal cross section", and a cross section taken along a plane perpendicular to the centerline direction is defined as a "transverse cross section".

[Usage pattern of stick 1]
The stick 1 according to the first embodiment is used in a non-combustion heating suction device 100 . As shown in FIG. 2, the suction device 100 includes a power supply unit 111 that accumulates power and supplies power to each component of the suction device 100, a sensor unit 112 that detects various information about the suction device 100, an information and a notification unit 113 for notifying the user of. The suction device 100 also includes a storage unit 114 for storing various information for the operation of the suction device 100, a communication unit 115 for transmitting and receiving information between the suction device 100 and other devices, and the suction device 100. and a control unit 116 for controlling overall internal operations. The suction device 100 also includes a heating unit 121 that heats the stick 1, a holding unit 140 that holds the stick 1, an opening 142 that communicates the internal space 141 with the outside, and other components of the suction device 100 from the heating unit 121. and a heat insulator 144 that prevents heat transfer to the element. In the suction device 100 , the user performs suction while the stick 1 is held by the holding portion 140 .

The heating part 121 heats the base material part 10 of the stick 1 . The heating part 121 is made of any material such as metal or polyimide. For example, the heating part 121 is configured in a film shape and arranged so as to cover the outer periphery of the holding part 140 . Then, when the heating part 121 generates heat, the aerosol source 11 (not shown in FIG. 2) included in the stick 1 is heated from the outer circumference of the stick 1 . The heating unit 121 generates heat when supplied with power from the power supply unit 111 . As an example, power may be supplied when the sensor unit 112 detects that a predetermined user input has been performed. When the temperature of the stick 1 heated by the heating unit 121 reaches a predetermined temperature, the user can suck. After that, when the sensor unit 112 detects that a predetermined user input has been performed, the power supply may be stopped. As an example of another usage pattern, power may be supplied and aerosol may be generated during a period in which the sensor unit 112 detects that the user has inhaled.

The heat insulation part 144 is arranged so as to cover at least the outer periphery of the heating part 121 . For example, the heat insulating part 144 is made of a vacuum heat insulating material, an airgel heat insulating material, or the like. A vacuum insulation material is, for example, a heat insulation material in which heat conduction due to gas is nearly zero by wrapping glass wool and silica (powder of silicon) in a resin film to create a high vacuum state. be.

[Base material portion 10]
The base member 10 has an aerosol source 11 that generates vapor from which an aerosol is generated when heated, and a wrapping paper 12 that covers the outer periphery of the aerosol source 11 . Substrate portion 10 of FIG. 1 is an example of a substrate portion that includes an aerosol source. The base material part 10 is formed in a cylindrical shape by winding the aerosol source 11 around the wrapping paper 12 . The aerosol source 11 may be tobacco-derived, such as, for example, tobacco cuts or tobacco raw materials molded into granules, sheets, or powder. The aerosol source 11 may also include non-tobacco sources made from plants other than tobacco (eg, mints, herbs, etc.). As an example, the aerosol source 11 may contain a perfume ingredient such as menthol. If the inhalation device 100 is a medical inhaler, the aerosol source 11 may contain a medicament for inhalation by the patient. The aerosol source 11 is not limited to solids, and may be polyhydric alcohols such as glycerin and propylene glycol, and liquids such as water. At least part of the base material part 10 is housed in the internal space 141 of the holding part 140 while the stick 1 is held by the holding part 140 shown in FIG.

The base material portion 10 formed by wrapping the aerosol source 11 with the wrapping paper 12 preferably has a columnar shape that satisfies a shape with an aspect ratio defined by Equation 1 of 1 or more.

In Equation 1, w is the width of the cross section of the base member 10, h is the size of the base member 10 in the direction of the center line, and h≧w is preferred. The shape of the cross section is not limited, and may be a polygon, a polygon with rounded corners, a circle, an ellipse, or the like. is the diameter of the circumscribed circle or the major axis of the circumscribed ellipse. It is preferable that the width of the aerosol source 11 constituting the base material portion 10 is 4 mm or more and 10 mm or less.

The size of the base material portion 10 in the center line direction can be appropriately changed according to the size of the product, but is usually 10 mm or more, preferably 12 mm or more, more preferably 15 mm or more, and 18 mm or more. is more preferable. The size of the base material portion 10 in the center line direction is usually 70 mm or less, preferably 50 mm or less, more preferably 30 mm or less, and even more preferably 25 mm or less.
In addition, in the center line direction, the ratio of the size of the base material part 10 to the size of the stick 1 is not particularly limited, but from the viewpoint of the balance between the delivery amount and the aerosol temperature, it is usually 10% or more, and 20% or more. is preferably 25% or more, and even more preferably 30% or more. In addition, the ratio of the size of the base material portion 10 to the size of the stick 1 is usually 80% or less, preferably 70% or less, more preferably 60% or less, and 50% or less. is more preferable, 45% or less is particularly preferable, and 40% or less is most preferable.

The content of the aerosol source 11 in the base material portion 10 is not particularly limited, but may be 200 mg or more and 800 mg or less, preferably 250 mg or more and 600 mg or less. This range is particularly suitable for the base member 10 with a circumference of 22 mm and a size of 20 mm in the centerline direction.
An aerosol source 11 containing tobacco cuts will now be described. The cut tobacco material contained in the aerosol source 11 is not particularly limited, and known materials such as lamina and backbone can be used. Alternatively, dried tobacco leaves are pulverized to an average particle size of 20 μm or more and 200 μm or less to obtain pulverized tobacco, which is homogenized and processed into a sheet (hereinafter also simply referred to as “homogenized sheet”). may be engraved. Furthermore, a homogenizing sheet having a size approximately equal to the size in the center line direction of the base material part 10 is chopped substantially horizontally with the center line direction of the base material part 10, and the aerosol source 11 is filled with the so-called strand. can be a type.
Moreover, the width of the chopped tobacco is preferably 0.5 mm or more and 2.0 mm or less for filling the aerosol source 11 .

Various kinds of tobacco can be used for the tobacco leaves used for producing the cut tobacco and the homogenized sheet. Examples include yellow, burley, oriental, landrace, other Nicotiana-tabacum varieties, Nicotiana-Rustica varieties, and mixtures thereof. As for the mixture, each kind can be appropriately blended and used so as to obtain the desired taste. Details of tobacco varieties are disclosed in "Tobacco Encyclopedia, Tobacco Research Center, March 31, 2009". There are a number of conventional methods for producing homogenized sheets, that is, methods for pulverizing tobacco leaves and processing them into homogenized sheets. The first is a method of producing a papermaking sheet using a papermaking process. The second method is to mix pulverized tobacco leaves with an appropriate solvent such as water to homogenize the mixture, and then thinly cast the homogenized product on a metal plate or metal plate belt and dry it to produce a cast sheet. is. A third method is to prepare a rolled sheet by mixing a suitable solvent such as water with pulverized tobacco leaves, homogenizing the mixture, and extruding the mixture into a sheet. Details of the types of homogenizing sheets are disclosed in "Encyclopedia of Tobacco, Tobacco Research Center, March 31, 2009".

The water content of the aerosol source 11 can be 10% by mass or more and 15% by mass or less, preferably 11% by mass or more and 13% by mass or less, relative to the total amount of the aerosol source 11 . Such a water content suppresses the occurrence of winding stains, and improves the winding suitability of the base material portion 10 during manufacturing.

The aerosol source 11 is not particularly limited, and may contain extracts from various natural products and/or constituents thereof, depending on the application. Extractable substances and/or constituents thereof may include glycerin, propylene glycol, triacetin, 1,3-butanediol, and mixtures thereof.
The content of the extracting substance and/or its constituent components in the aerosol source 11 is not particularly limited, and from the viewpoint of sufficiently generating an aerosol and imparting a good flavor, it is usually It is 5% by mass or more, preferably 10% by mass or more. In addition, the content of the extractable substance and/or its constituent components in the aerosol source 11 is usually 50% by mass or less, preferably 15% by mass or more and 25% by mass or less.
Aerosol source 11 may contain a perfume. The type of fragrance is not particularly limited, and menthol is particularly preferable from the viewpoint of imparting a good flavor. Moreover, these fragrance|flavors may be used individually by 1 type, or may use 2 or more types together.

The packing density of the aerosol source 11 is not particularly limited, but is usually 250 mg/cm ³ or more, preferably 300 mg/cm ³ or more, from the viewpoint of securing the performance of the stick 1 and imparting good flavor. Also, the packing density in the aerosol source 11 is usually 400 mg/cm ³ or less, preferably 350 mg/cm ³ or less.

The aerosol source 11 may also consist of tobacco sheets. The number of tobacco sheets may be one, or two or more.
In the case where the aerosol source 11 is composed of one tobacco sheet, for example, a tobacco sheet having one side of a size approximately equal to the size in the center line direction of the object to be filled is used as the object to be filled. A mode (so-called gathered sheet) in which the sheet is filled in a state in which the sheet is folded back multiple times horizontally with respect to the center line direction of the sheet is exemplified. In addition, there is also a mode in which a tobacco sheet having one side of which is approximately the same size as the centerline direction of the object to be filled is wound in a direction orthogonal to the centerline direction of the object to be filled. mentioned.

As a mode in which the aerosol source 11 is composed of two or more tobacco sheets, for example, a plurality of tobacco sheets each having a size approximately equal to the size in the center line direction of the object to be filled, A mode in which the material is wound in a direction orthogonal to the center line direction of the material to be filled so as to be arranged concentrically is exemplified.
"Concentrically arranged" means that the centers of all the tobacco sheets are arranged at approximately the same position. In addition, the number of tobacco sheets is not particularly limited, but may be 2, 3, 4, 5, 6, or 7 sheets.
Two or more tobacco sheets may all have the same composition or physical properties, or a part or all of each tobacco sheet may have different compositions or physical properties. Moreover, the thickness of each tobacco sheet may be the same or different.
The thickness of each tobacco sheet is not limited, but is preferably 150 μm or more and 1000 μm or less, more preferably 200 μm or more and 600 μm or less, in terms of balance between heat transfer efficiency and strength.

The aerosol source 11 prepares a plurality of tobacco sheets having different widths, prepares a laminated body in which the width decreases from the first side to the second side, passes the laminated body through a winding tube, and winds and forms the laminated body. It can be manufactured by
According to this manufacturing method, the plurality of tobacco sheets extend in the centerline direction and are arranged concentrically around the centerline CL.
In this manufacturing method, the laminate is preferably prepared so that a non-contact portion is formed between adjacent tobacco sheets after roll-forming. If there is a non-contact portion (gap) between the plurality of tobacco sheets, which is not in contact with the tobacco sheets, the flavor flow path can be secured and the delivery efficiency of the flavor component can be enhanced. On the other hand, since the heat from the heater can be transferred to the outer tobacco sheets through the contact portions of the plurality of tobacco sheets, high heat transfer efficiency can be ensured.
In order to provide a non-contact portion between a plurality of tobacco sheets where the tobacco sheets do not contact, for example, an embossed tobacco sheet is used, adjacent tobacco sheets are laminated without bonding the entire surfaces of adjacent tobacco sheets, and adjacent tobacco sheets are stacked together. Alternatively, the entire or part of the adjacent tobacco sheets are lightly adhered so that they can be separated after roll-forming, thereby preparing a laminate.
When the base material portion 10 including the wrapping paper 12 is prepared, the wrapping paper 12 may be arranged on the end surface of the first side of the laminate.

Polyols such as glycerin, propylene glycol, and 1,3-butanediol may be added to tobacco sheets. The amount added to the tobacco sheet is preferably 5% by mass or more and 50% by mass or less, more preferably 15% by mass or more and 25% by mass or less, relative to the dry mass of the tobacco sheet.

Tobacco sheets can be appropriately manufactured by known methods such as paper making, slurrying, and rolling. Note that the uniformizing sheet described above can also be used.
In the case of papermaking, it can be manufactured by a method including the following steps. 1) Dry tobacco leaves are crushed and extracted with water to separate the water extract and residue. 2) Dry and concentrate the water extract under reduced pressure. 3) Pulp is added to the residue, fiberized with a refiner, and then paper is made. 4) A concentrated solution of the water extract is added to the paper sheet and dried to obtain a tobacco sheet. In this case, a step of removing some components such as nitrosamines may be added (see JP-T-2004-510422).
In the case of the slurry method, it can be produced by a method including the following steps. 1) Mix crushed tobacco leaves with water, pulp and binder. 2) The mixture is spread (cast) and dried. In this case, a step of removing some components such as nitrosamines by irradiating a slurry obtained by mixing water, pulp and binder with crushed tobacco leaves with ultraviolet rays or X-rays may be added.

In addition, as described in WO 2014/104078, a non-woven tobacco sheet manufactured by a method including the following steps can also be used. 1) Mix powdered tobacco leaves and a binder. 2) The mixture is sandwiched between non-woven fabrics. 3) Forming the laminate into a certain shape by heat welding to obtain a non-woven tobacco sheet.
The types of raw material tobacco leaves used in each of the above methods may be the same as those described for the aerosol source 11 containing cut tobacco.
Although the composition of the tobacco sheet is not particularly limited, for example, the content of the tobacco raw materials (tobacco leaves) is preferably 50% by mass or more and 95% by mass or less with respect to the total mass of the tobacco sheet. The tobacco sheet may also contain a binder, and examples of such binders include guar gum, xanthan gum, carboxymethylcellulose, sodium salts of carboxymethylcellulose, and the like. The amount of the binder is preferably 1% by mass or more and 10% by mass or less with respect to the total mass of the tobacco sheet. The tobacco sheet may further contain other additives. Examples of additives include fillers such as pulp.

The structure of the wrapping paper 12 used for the base material portion 10 is not particularly limited, and can be a general form, for example, one containing pulp as a main component. As pulp, in addition to wood pulp such as softwood pulp and hardwood pulp, non-wood pulp such as flax pulp, hemp pulp, sisal pulp, and esparto, which are generally used for wrapping paper 12 for tobacco products, can be used. It may be obtained by mixing and manufacturing.
The types of pulp that can be used include chemical pulp, ground pulp, chemi-grand pulp, thermomechanical pulp, and the like prepared by kraft cooking, acid/neutral/alkaline sulfite cooking, soda salt cooking, and the like.

Using the pulp, the winding paper 12 is manufactured by preparing and uniforming the texture in the papermaking process using a fourdrinier paper machine, a cylinder paper machine, a circular and short composite paper machine, and the like. If necessary, a wet strength agent may be added to impart water resistance to the wrapping paper 12, or a sizing agent may be added to adjust the printing condition of the wrapping paper 12. Furthermore, aluminum sulfate, various anionic, cationic, nonionic or amphoteric retention improvers, drainage improvers, papermaking internal additives such as paper strength agents, and dyes, pH adjusters, Papermaking additives such as antifoam agents, pitch control agents, and slime control agents can be added.

The basis weight of the base paper for the wrapping paper 12 is, for example, usually 20 gsm or more, preferably 25 gsm or more. On the other hand, the basis weight is usually 65 gsm or less, preferably 50 gsm or less, more preferably 45 gsm or less.
The thickness of the wrapping paper 12 is not particularly limited, and is usually 10 μm or more, preferably 20 μm or more, more preferably 30 μm or more, from the viewpoints of rigidity, air permeability, and ease of adjustment during paper production. The thickness of the wrapping paper 12 is usually 100 μm or less, preferably 75 μm or less, more preferably 50 μm or less.
The shape of the wrapping paper 12 for producing the base material part 10 can be square or rectangular.
When the aerosol source 11 is used as the wrapping paper 12, the length of one side can be about 12 mm or more and 70 mm or less. , and a more preferable length is about 23 mm. When the aerosol source 11 is wound with the wrapping paper 12 in a cylindrical shape, for example, in the circumferential direction, the end of the wrapping paper 12 and the end of the wrapping paper 12 on the opposite side are overlapped by about 2 mm and glued to form a cylindrical paper. It has the shape of a tube in which the aerosol source 11 is filled. The size of the rectangular wrapping paper 12 can be determined by the size of the base material portion 10 .

In addition to the pulp described above, the paper wrapper 12 may also contain fillers. The content of the filler can be 10% by mass or more and less than 60% by mass, preferably 15% by mass or more and 45% by mass or less, based on the total mass of the wrapping paper 12 .
In the wrapping paper 12, the filler content is preferably 15% by mass or more and 45% by mass or less in a preferable basis weight range (25 gsm or more and 45 gsm or less).
Further, when the basis weight is 25 gsm or more and 35 gsm or less, the filler content is preferably 15 mass % or more and 45 mass % or less, and when the basis weight is 35 gsm or more and 45 gsm or less, the filler content is 25 mass % or more and 45 mass % or less. is preferred.
As a filler, calcium carbonate, titanium dioxide, kaolin, and the like can be used, but from the viewpoint of enhancing flavor and whiteness, it is preferable to use calcium carbonate.

Various auxiliary agents other than base paper and fillers may be added to the wrapping paper 12. For example, a water resistance improver may be added to improve water resistance. Water resistance improvers include wet strength agents (WS agents) and sizing agents. Examples of wet strength agents include urea formaldehyde resin, melamine formaldehyde resin, polyamide epichlorohydrin (PAE), and the like. Examples of sizing agents include rosin soap, alkyl ketene dimer (AKD), alkenyl succinic anhydride (ASA), and highly saponified polyvinyl alcohol having a degree of saponification of 90% or more.
As an auxiliary agent, a paper strength agent may be added, and examples thereof include polyacrylamide, cationic starch, oxidized starch, CMC, polyamide epichlorohydrin resin, polyvinyl alcohol, and the like. In particular, it is known that the use of an extremely small amount of oxidized starch improves air permeability (Japanese Patent Application Laid-Open No. 2017-218699).

A coating agent may be added to at least one of the front and back sides of the wrapping paper 12 . The coating agent is not particularly limited, but a coating agent capable of forming a film on the paper surface and reducing liquid permeability is preferred. For example, alginic acid and its salts (e.g. sodium salts), polysaccharides such as pectin, cellulose derivatives such as ethyl cellulose, methyl cellulose, carboxymethyl cellulose, nitrocellulose, starch and derivatives thereof (e.g. carboxymethyl starch, hydroxyalkyl starch and cationic starch). and ether derivatives such as starch acetate, starch phosphate and ester derivatives such as starch octenylsuccinate).

[Cooling part 20]
The cooling part 20 is arranged adjacent to the base material part 10 and the mouthpiece part 30, and is a member formed so that the cross section of a cylinder or the like becomes hollow (cavity) by winding the forming paper 21. .

The size of the cooling part 20 in the centerline direction can be appropriately changed according to the size of the product, but it is usually 5 mm or more, preferably 10 mm or more, and more preferably 15 mm or more. Also, the size of the cooling part 20 in the center line direction is usually 35 mm or less, preferably 30 mm or less, and more preferably 25 mm or less. By setting the size of the cooling unit 20 in the center line direction to the above-described lower limit or more, it is possible to secure a sufficient cooling effect and obtain a good flavor. It is possible to suppress the loss caused by the aerosol adhering to the forming paper 21 .

The cooling part 20 preferably has a large inner surface area. The forming paper 21 forming the cooling section 20 may be formed by a thin sheet of material that is crumpled to form channels and then pleated, gathered and folded. The more folds or folds in a given volume of the element, the greater the total surface area of cooling section 20 .
The thickness of the molding paper 21 is not particularly limited, and may be, for example, 5 μm or more and 500 μm or less, or 10 μm or more and 250 μm or less. The material of the molding paper 21 is not particularly limited. For example, pulp may be the main component, and polyethylene, polypropylene, polyvinyl chloride, polyethylene terephthalate, polylactic acid, cellulose acetate, and aluminum foil may be used. may be the main component, or any combination thereof.

The cooling part 20 is provided with openings V (also called "ventilation filter (Vf)" in this technical field) concentrically and circumferentially. The opening V exists in a region where air can flow from the outside of the stick 1 , in other words, in a region where the stick 1 is held by the holding portion 140 of the suction device 100 and protrudes from the opening 142 .

The existence of the openings V allows air to flow into the interior of the cooling section 20 from the outside during suction, and the temperature of steam or air flowing in from the base material section 10 can be lowered. Furthermore, by setting the position where the opening V is provided in the cooling part 20 within a region of 4 mm or more in the direction of the cooling part 20 side from the boundary between the cooling part 20 and the mouthpiece part 30, the cooling capacity can be improved only by Therefore, it is possible to suppress the retention of the substance (product) generated by heating in the cooling unit 20 and improve the delivery amount of the product.
It should be noted that the vapor generated from the aerosol as the condensation nucleus by heating the base material portion 10 can be liquefied by contacting the air from the outside and the temperature is lowered, and the generation of the aerosol can be accelerated. . The cooling unit 20 is an example of a cooling unit that cools vapor generated by heating the base material to generate an aerosol.

In the cooling unit 20, when the concentric holes V are treated as one hole group, the number of hole groups may be one, or two or more. When there are two or more hole groups, from the viewpoint of improving the delivery amount of the component generated by heating, from the boundary between the cooling section 20 and the mouthpiece section 30, in a region of less than 4 mm in the direction of the cooling section 20 side It is preferable not to provide an aperture group.
In addition, when the stick 1 has a configuration in which the base material portion 10 , the cooling portion 20 and the mouthpiece portion 30 are wrapped with the tip paper 40 , the tip paper 40 has the openings V provided in the cooling portion 20 . It is preferable that an opening be provided at a position directly above the . When such a stick 1 is produced, tipping paper 40 provided with openings overlapping with the openings V may be prepared and wound. It is preferable to drill a hole through the cooling part 20 and the tipping paper 40 at the same time after making the stick 1 without the stick 1 .

From the viewpoint of improving product delivery by heating, the region where the opening V exists is not particularly limited as long as it is a region of 4 mm or more in the direction of the cooling section 20 from the boundary between the cooling section 20 and the mouthpiece section 30. However, from the viewpoint of further improving product delivery, the area is preferably 4.5 mm or more, more preferably 5 mm or more, and even more preferably 5.5 mm or more. In addition, from the viewpoint of ensuring the cooling function, the region where the opening V exists is preferably a region of 15 mm or less, more preferably a region of 10 mm or less, and further preferably a region of 7 mm or less. .

From the viewpoint of improving the delivery of the product by heating, the region where the opening V exists is preferably a region of 24 mm or more in the direction from the end surface of the first side of the stick 1 to the cooling part 20 side, and 24.5 mm The area is preferably 25 mm or more, more preferably 25.5 mm or more. In addition, from the viewpoint of ensuring the cooling function, the region where the opening V exists is preferably a region of 35 mm or less, more preferably a region of 30 mm or less, and even more preferably a region of 27 mm or less. .

In addition, considering the boundary between the cooling part 20 and the base material part 10 as a reference, if the size of the cooling part 20 in the center line direction is 20 mm or more, the area where the opening V exists will ensure the cooling function. From the point of view, from the boundary between the cooling part 20 and the base material part 10, the area is preferably 5 mm or more in the direction of the cooling part 20 side, more preferably 10 mm or more, and 13 mm or more. is more preferred. In addition, from the viewpoint of improving the delivery of the product by heating, the region where the opening V exists is a region of 16 mm or less in the direction of the cooling part 20 from the boundary between the cooling part 20 and the base material part 10. is preferably 15.5 mm or less, more preferably 15.5 mm or less, and particularly preferably 14.5 mm or less.

The apertures V are provided so that the ratio of air inflow through the apertures V is 10% by volume or more and 90% by volume or less when sucked at 17.5 ml/sec by an automatic smoking machine. This "air inflow ratio" is the volume ratio of the air that has flowed in from the opening V when the ratio of the air sucked from the mouth end is 100% by volume. The air inflow ratio is preferably 50% by volume or more and 80% by volume or less, more preferably 55% by volume or more and 75% by volume or less. For these air inflow ratios, for example, the number of holes V per hole group is selected from a range of 5 to 50, and the diameter of the holes V is set to a range of 0.1 mm to 0.5 mm. can be selected from and achieved by a combination of these selections.
The air inflow ratio can be measured by a method conforming to ISO9512 using an automatic smoking machine (for example, a single bottle automatic smoking machine manufactured by Borgwaldt).

[Chip paper 40]
The configuration of the tipping paper 40 is not particularly limited, and can be in a general form, and for example, can include pulp as a main component. As for the pulp, in addition to being made from wood pulp such as softwood pulp and hardwood pulp, non-wood pulp such as flax pulp, hemp pulp, sisal pulp, and esparto, which are generally used for cigarette paper, are mixed. and obtained by manufacturing. These pulps may be used alone or in combination of multiple types at any ratio.
Also, the tipping paper 40 may be composed of one sheet, or may be composed of a plurality of sheets or more.
As the form of pulp, chemical pulp, ground pulp, chemi-grand pulp, thermomechanical pulp, etc. prepared by kraft cooking method, acid/neutral/alkaline sulfite cooking method, soda salt cooking method or the like can be used.
Note that the tip paper 40 may be manufactured by a manufacturing method to be described later, or may be a commercially available product.
The shape of the tipping paper 40 is not particularly limited, and can be square or rectangular, for example.

The basis weight of the tipping paper 40 is not particularly limited, but is usually 32 gsm to 60 gsm, preferably 33 gsm to 55 gsm, more preferably 34 gsm to 53 gsm.
Although the air permeability of the tipping paper 40 is not particularly limited, it is generally 0 Coresta unit or more and 30000 Coresta unit or less, and preferably more than 0 Coresta unit and 10000 Coresta unit or less. Air permeability is a value measured in accordance with ISO 2965:2009, and is expressed as the flow rate (cm ³ ) of gas passing through an area of 1 cm ² per minute when the pressure difference between both sides of the paper is 1 kPa. be done. One Coresta unit (1 Coresta unit, 1 CU) is cm ³ /(min·cm ² ) under 1 kPa.

The chipping paper 40 may contain fillers other than the above pulp, for example, metal carbonates such as calcium carbonate and magnesium carbonate, metal oxides such as titanium oxide, titanium dioxide and aluminum oxide, barium sulfate, metal sulfates such as calcium sulfate, metal sulfides such as zinc sulfide, quartz, kaolin, talc, diatomaceous earth, gypsum, etc.; preferably contains These fillers may be used singly or in combination of two or more.

In addition to the above pulp and filler, the chipping paper 40 may contain various auxiliary agents, for example, a water resistance improver to improve water resistance. Water resistance improvers include wet strength agents (WS agents) and sizing agents. Examples of wet strength agents include urea formaldehyde resin, melamine formaldehyde resin, polyamide epichlorohydrin (PAE), and the like. Examples of sizing agents include rosin soap, alkyl ketene dimer (AKD), alkenyl succinic anhydride (ASA), and highly saponified polyvinyl alcohol having a degree of saponification of 90% or more.

A coating agent may be added to at least one of the front and back sides of the tip paper 40 . The coating agent is not particularly limited, but a coating agent capable of forming a film on the paper surface and reducing liquid permeability is preferred.
A portion of the outer surface of tipping paper 40 may be covered with a rip release material. The lip release material is a material that assists the user to release the contact between the lips and the tipping paper 40 easily without substantially sticking when the mouthpiece portion 30 of the stick 1 is held in the mouth. means the material of which it is composed. Lip release materials may include, for example, ethyl cellulose, methyl cellulose, and the like. For example, the outer surface of the tipping paper 40 may be coated with a rip release material by applying an ethylcellulose-based or methylcellulose-based ink to the outer surface of the tipping paper 40 .

[Mouthpiece section 30]
The mouthpiece section 30 is connected to the second side of the cooling section 20 via tipping paper 40 . The tip paper 40 connects (joins) the second end of the cooling section 20 and the first end of the mouthpiece section 30 by winding them together.

Mouthpiece section 30 has filter 31 as a main component.
The filter 31 is not particularly limited as long as it has general filter functions. General functions of filters include, for example, adjusting the amount of air mixed when inhaling aerosols, etc., reducing flavor, reducing nicotine and tar, etc., but having all of these functions is not possible. don't need it. In addition, in the non-combustion heating stick 1, which tends to produce fewer components and a lower filling rate of the aerosol source 11 than cigarette products, the aerosol source 11 falls off while suppressing the filtering function. It is also one of the important functions to prevent The filter 31 usually has a filter material, and the filter material is, for example, formed into a columnar shape using a filler such as cellulose acetate fiber, acetate fiber, charcoal fiber, non-woven fabric, or pulp paper as a filter material. Moreover, the aspect using the paper filter filled with the sheet-like pulp paper may be sufficient.
Although the density of the filter material is not particularly limited, it is usually 0.10 g/cm ³ or more and 0.25 g/cm 3 or less, preferably 0.11 g/cm ³ ^or more and 0.24 g/cm ³ or less. More preferably, it is 0.23 g/cm ³ or more and 0.23 g/cm ³ or less.

It should be noted that filter 31 may comprise a crushable additive release container (eg, capsule) with a crushable outer shell such as gelatin. The form of the additive release container such as a capsule is not particularly limited, and known forms may be employed. In the case of capsules, when broken by the user before, during, or after use, it releases the liquid or substance contained within the capsule (usually a flavoring agent), which in turn releases the stick. It is delivered to the aerosol during use.
The shape of the capsule is not particularly limited, and may be, for example, an easily breakable capsule, preferably spherical. The additive contained in the capsule may contain any additive, but it is particularly preferable to contain a flavoring agent and activated carbon. Additionally, one or more materials may be added as additives to help filter the aerosol. Although the form of the additive is not particularly limited, it is usually liquid or solid. Incidentally, easily breakable capsules and methods for producing the same may be well-known ones.
Flavoring agents may be, for example, menthol, spearmint, peppermint, fenugreek, cloves, medium-chain triglycerides (MCT), etc., and one or a combination thereof may be used.

In addition, the filter further contains other components such as inorganic fine powder (kaolin, talc, diatomaceous earth, quartz, calcium carbonate, barium sulfate, titanium oxide, alumina, etc.), heat stabilizer (alkali or alkaline earth metal salts, etc.), coloring agents, whiteness improvers, oils, yield improvers, sizing agents, biodegradation or photodegradation accelerators (anatase type titanium oxide, etc.), natural polymers or their derivatives (cellulose powder, etc.), etc. You can stay. Other components can be used individually or in combination of 2 or more types.
4. The cross section of the filter 31 of the mouthpiece 30 is substantially circular, and the diameter of the circle can be changed according to the size of the product. It is preferably 5 mm or more and 8.5 mm or less, and more preferably 5.0 mm or more and 8.0 mm or less. If the cross section is not circular, the above diameter is assumed to be a circle having the same area as that of the cross section, and the diameter of that circle is applied.

The length of the perimeter of the cross section of the filter 31 can be appropriately changed according to the size of the product, but it is usually 14.0 mm or more and 27.0 mm or less, preferably 15.0 mm or more and 26.0 mm or less. It is more preferably 16.0 mm or more and 25.0 mm or less.
The size of the mouthpiece portion 30 in the center line direction can be appropriately changed according to the size of the product. It is more preferable that the distance is greater than or equal to 25.0 mm or less. The shape and dimensions of the filter 31 and other structures included in the mouthpiece 30 can be appropriately adjusted so that the shape and dimensions of the mouthpiece 30 fall within the above ranges.

The ventilation resistance per 120 mm of the size of the mouthpiece part 30 in the center line direction is not particularly limited, but is usually 40 mmH ₂ O or more and 300 mmH ₂ O or less, and preferably 70 mmH ₂ O or more and 280 mmH ₂ O or less. , 90 mmH ₂ O or more and 260 mmH ₂ O or less.
The airflow resistance is measured according to the ISO standard method (ISO6565) using, for example, a Cerulean filter airflow resistance meter. The ventilation resistance of the mouthpiece portion 30 is measured when air is flowed from the first side to the second side at a predetermined air flow rate (17.5 cc/min) in a state in which air does not pass through the side surfaces of the mouthpiece portion 30. refers to the pressure difference between the first and second sides of Units are generally expressed in _mmH2O .

From the viewpoint of improving the strength and structural rigidity, it is preferable that the mouthpiece portion 30 includes a winding paper 32 around which the filter 31 and the like are wound. The form of the web 32 is not particularly limited, and may have one or more rows of adhesive-containing seams. The adhesive may comprise a hot melt adhesive, and the hot melt adhesive may comprise polyvinyl alcohol. Moreover, when the filter segment consists of two or more segments, the paper roll is preferably wound by combining these two or more segments.
The material of the paper roll 32 is not particularly limited, and known materials can be used, and it may contain a filler such as calcium carbonate.
The thickness of the paper roll 32 is not particularly limited, and is usually 20 μm or more and 140 μm or less, preferably 30 μm or more and 130 μm or less, and more preferably 30 μm or more and 120 μm or less.
The basis weight of the paper roll 32 is not particularly limited, and is usually 20 gsm or more and 100 gsm or less, preferably 22 gsm or more and 95 gsm or less, and more preferably 23 gsm or more and 90 gsm or less.
The web 32 may or may not be coated, but is preferably coated with a desired material from the viewpoint of imparting functions other than strength and structural rigidity.

Mouthpiece portion 30 may further include a center hole portion having one or more hollow portions.
FIG. 3(a) shows a diagram including a center hole portion 35 as a schematic diagram showing a longitudinal section of the mouthpiece portion 30 of the non-combustion heating stick according to the second embodiment. The left side of FIG. 3A is the cooling unit 20 side (first side), and the right side is the end side (second side) where the user holds the liquid in his/her mouth for suction.
The center hole portion 35 is normally arranged closer to the cooling section 20 than the filter 31 as shown in the drawing, and preferably adjacent to the cooling section 20 .

The center hole portion 35 is composed of a filling layer 33 having one or more hollow portions and an inner winding paper 34 covering the filling layer. The center hole portion 35 has a function of increasing the strength of the mouthpiece portion 30 . The filling layer 33 is, for example, filled with cellulose acetate fibers at a high density, added with a plasticizer containing triacetin in an amount of 6% by mass or more and 20% by mass or less based on the mass of cellulose acetate, and hardened to have an inner diameter of 1.0 mm or more. It can be a rod of 5.0 mm or less. Since the filling layer 33 has a high packing density of fibers, air and aerosol flow only through the hollow portion during suction, and hardly flow inside the filling layer. Since the filling layer 33 inside the center hole portion 35 is a fiber filling layer, the feeling of touch from the outside during use is less likely to cause discomfort to the user. Note that the center hole portion 35 may not have the inner paper roll 34 and may retain its shape by thermoforming.

The center hole portion 35 and the filter 31 may be connected by, for example, an outer roll paper 36 . The outer paper web 36 may be, for example, a cylindrical paper. Further, the base material part 10, the cooling part 20, and the connected center hole part 35 and the filter 31 may be connected by chip paper, for example. These connections are made, for example, by coating the inner surface of the outer roll paper 36 with glue such as vinyl acetate, inserting the base material portion 10, the cooling portion 20, the connected center hole portion 35 and the filter 31, and winding them. can do. These may be divided and connected multiple times with multiple pieces of paper.
The inner roll paper 34 and the outer roll paper 36 used in the center hole portion 35 can be the same as the roll paper 32 in terms of the form, material, thickness, basis weight, and the like. The inner web 34 can also be omitted.

The filter 31 of the mouthpiece portion 30 may also be divided into two or more segments to form cavities between the filters.
FIG. 3(b) is a schematic diagram showing a vertical cross section of the mouthpiece portion 30 of the non-combustion heating stick according to the third embodiment, showing a view in which a cavity 37 is formed between filters. Similarly to FIG. 3(a), the left side of FIG. 3(b) is the cooling unit 20 side (first side), and the right side is the end side (second side) where the user sucks. .
In FIG. 3(b) the filter 31 forms two segments and there is a hollow cavity 37 between the two filters. The cavity 37 is formed by winding the web 32 with the two filter segments in the desired positions. Usually, a portion of the base material portion 10, the cooling portion 20, and the mouthpiece portion 30 are further wrapped with chipping paper (not shown) on the outside of the paper roll 32. As shown in FIG.
Cavity 37 may incorporate a crushable additive release container (eg, capsule) containing a crushable outer shell, such as gelatin, similar to that contained in filter 31 . If one capsule is placed in the cavity 37, the size of the capsule should be no more than 5 mm and smaller than the internal diameter of the cavity. Also, when two or more capsules are placed in the cavity, the size of the capsules should be 3.5 mm or less and smaller than the inner diameter of the cavity.
Silica gel, which will be described later, may be placed in the cavity.

[silica gel]
In the embodiments described above, at least one of the cooling portion 20 and the mouthpiece portion 30 contains silica gel. It may be contained in both the cooling section and the mouthpiece section, but is preferably contained in the mouthpiece section.
The average particle size of the silica gel to be used is not limited as long as it can be used in the stick 1 of the present embodiment, and can be changed according to the location where the silica gel is used. 50 μm or more is more preferable, and 100 μm or more, further 200 μm or more, particularly 250 μm or more is preferable. Further, it is more preferably 2000 μm or less, and 1800 μm or less, particularly preferably 1400 μm or less.
Although the average pore diameter of silica gel is not particularly limited, it is preferably 5 nm or more and 350 nm or less from the viewpoint of selective removal of aldehydes and the like. Further, it is preferably 6 nm or more, 20 nm or more, and particularly preferably 30 nm or more. Also, it is more preferably 320 nm or less, more preferably 200 nm or less, particularly 130 nm or less, most preferably 100 nm or less.
The pore volume of silica gel is not particularly limited, and is preferably 200 μL/g or more and 1000 μL/g or less, more preferably 300 μL/g or more and 800 μL/g or less, further preferably 500 μL/g or more, A concentration of 700 μL/g or less can be used. The pore volume can be calculated from the maximum adsorption amount obtained using the nitrogen gas adsorption method.
The BET specific surface area of the silica gel used is not particularly limited, but is preferably 100 m ² /g or more and 700 m ² /g or less, more preferably 200 m ² /g or more and 600 m ² /g or less, further preferably Those having a density of 300 m ² /g or more and 500 m ² /g or less can be used. The BET specific surface area can be determined by a nitrogen gas adsorption method (BET multipoint method).
Silica gel that can be used in the present embodiment preferably has a cumulative 50% by volume particle diameter (particle diameter D50) of 35 μm or more and 2500 μm or less.
D50 is measured by a laser diffraction scattering method. As an apparatus suitable for this measurement, there is a laser diffraction/scattering particle size distribution measuring apparatus "LA-950" manufactured by Horiba. Powder is poured into the cell of this device together with pure water, and the particle size is detected based on the light scattering information of the particles.
Measurement conditions by the apparatus are as follows.
Measurement mode: Manual flow cell measurement Dispersion medium: Ion-exchanged water Dispersion method: Measured after 1 minute of ultrasonic irradiation Refractive index: 1.92-0.00i (sample refraction) / 1.33-0.00i (dispersion medium refractive index)
Number of measurements: 2 measurements with different samples

The method for producing silica gel is not particularly limited. As a general method, there is a method of mixing an aqueous solution of sodium silicate with a mineral acid such as hydrochloric acid or sulfuric acid, gelling the mixture, and washing the mixture with water. In this method, sodium silicate becomes a silicic acid monomer by mixing with a mineral acid, and the silicic acid monomer undergoes dehydration condensation to form a cyclic compound. Silica gel has silanol groups (Si—OH), especially silanol groups on the surface.
By containing silica gel, the stick 1 of the present embodiment preferentially removes the smoking taste-inhibiting components such as aldehydes while maintaining the user's satisfaction with the smoking taste. This is presumably because the silanol groups present in the silica gel are excellent in selective adsorption of flavor-inhibiting components such as aldehydes, while their adsorption of flavor components is low.

The silica gel to be used is not particularly limited, but in order to preferentially remove the desired component from the aerosol generated in the stick, a specific catalyst may be present in the pores of the silica gel, and the following formula (2) may have a substituent of
R ¹ (CH ₂ ) _n — (2)
In formula (2), n is an integer of 1 or more and 40 or less, preferably an integer of 3 or more and 18 or less, and most preferably 3. R ¹ is an alkyl or allyl group having 1 to 40 carbon atoms. R ¹ consists of hydrogen, hydroxyl, amine, amide, cyano, nitrile, nitro, thio, sulfide, sulfone, sulfoxide, I, Br, Cl, F, O, N, S, I, Br, Cl and F substituted by one or more atoms selected from the group selected from among hydrogen, hydroxyl, amine, amide, cyano, nitrile, nitro, thio, sulfide, sulfone, sulfoxide, I, Br, Cl, F preferably substituted by one or more atoms.

Silica gel is preferably present together with amino groups from the viewpoint of selective adsorption of flavor-inhibiting components such as aldehydes. Specific aspects are not particularly limited. Preferred embodiments include an embodiment in which the silica gel has an amino group as a substituent, and an embodiment in which an amino compound (a compound having an amino group in the molecule) and silica gel are in contact, and these two embodiments are used in combination. You may In the embodiment in which the silica gel is in contact with the amino compound, the silica gel and the amino compound form some kind of complex from the viewpoint of effective interaction between the silica gel and the amino compound and the ease of manufacturing the stick. preferably.
When having an amino group as a substituent, the substituent is the following formula (1)
NR ₂ —(CH ₂ ) _n — (1)
A group represented by is preferred. In formula (1), n has the same meaning as in formula (2) and is an integer of 1 or more and 40 or less, preferably an integer of 3 or more and 18 or less, and most preferably 3. Further, each R is independently selected from the group consisting of H, an allyl group, and an alkyl group having 1 to 5 carbon atoms, and is a primary amine (both R are H). is preferred. In particular, primary amines chemically selectively react with aldehydes in aerosols to form covalent bonds, and the products are bound to non-volatile silica gel, thus selectively removing aldehydes from the aerosol. is considered to be

A more preferred substituent is
NR ₂ —(CH ₂ ) _n —S— (3)
is an aminoalkylsilyl group represented by In formula (3), n has the same meaning as in formulas (1) and (2), and R has the same meaning as in formula (2). In the case of the substituent represented by formula (3), examples of the aminoalkylsilyl group introduced into the silica gel include a 3-aminopropylsilyl group, an N-[2-aminoethyl]-3-aminopropylsilyl group, an N -[3-aminoethyl]-3-aminopropylsilyl group or N-[N-(2-aminoethyl)-2-aminoethyl]-3-aminopropylsilyl group.

An example of a method for producing amino-modified silica gel having the above substituents is, for example, mixing silica gel with aminopropyltriethoxysilane, preferably aminoalkyltriethoxysilane such as 3-aminopropyltriethoxysilane, in water and ethanol solvents. is mentioned. Other solvents such as toluene can also be used. The mixture is heated for several hours to react the aminopropyltriethoxysilane compound with the silica gel and chemically bond it to the silica gel surface. The reaction mixture is then filtered to obtain a reaction product containing amino-modified silica gel. The reaction product is washed successively with solvent and dried.
Such amino-modified silica gel manufacturing processes may use other aminopropyltrialkoxysilanes such as 3-aminopropyltrimethoxysilane.

Amino-modified silica gel can also be prepared by the following specific procedure. A suspension of selected silica gel is rapidly stirred in a solution of water and ethanol. A 3-aminopropyltrialkoxysilane compound, preferably 3-aminopropyltriethoxysilane, is added to the mixture. The 3-aminopropyltrialkoxysilane can be added before, during or after heating. The 3-aminopropyltrialkoxysilane is preferably pre-diluted with absolute ethanol. The resulting mixture is then preferably heated to the boiling point. In the most preferred example, ethanol is distilled off and replaced with water. The solid matter obtained after heating is separated by a solid-liquid separation method such as filtration, and washed with an arbitrary solvent, preferably water. Then, by drying, the desired amino-modified silica gel is obtained.
Silica gel having an amino group preferably has a total nitrogen content of 0.20% by mass or more and 1.00% by mass or less from the viewpoint of selective adsorption of aldehydes and the like. More preferably 0.30% by mass or more, particularly preferably 0.50% by mass or more. Moreover, it is more preferably 0.95% by mass or less, particularly preferably 0.90% by mass or less.

When the silica gel is brought into contact with the amino compound, it is preferred that the silica gel and the amino compound form a complex. In this case, the amino compound to be used is not particularly limited as long as it is a compound having an amino group, but preferred examples include amino acids, aminosulfonic acids, and polysaccharides having an amino group. One type of amino compound may be used, or two or more types may be used in combination.
Examples of amino acids include amino acids and amino acid salts thereof. The amino acid may be a neutral amino acid (monoaminomonocarboxylic acid, etc.), an acidic amino acid (monoaminodicarboxylic acid, etc.), a basic amino acid (diaminomonocarboxylic acid, etc.), or a sulfur-containing amino acid. good. Also, the amino acid may be α-amino acid, β-amino acid, γ-amino acid, etc., and in particular α-amino acid. The amino acid may be in optically active form (D-form, L-form, etc.) or racemic form. Amino acids also include polyamino acids with a low degree of polymerization (for example, with a degree of polymerization of 2 or more and 9 or less, preferably 2 or more and 5 or less, more preferably 2 or more and 3 or less). The amino acid may have a substituent, and may be an amino acid derivative in which at least part of the carboxyl group or amino group is derivatized. For example, in an amino acid, at least some of the carboxyl groups may be derivatized carboxyl groups (eg, amide groups, etc.).

Representative amino acids include the following examples.
- Aliphatic amino acids: for example, aliphatic monoaminocarboxylic acids (aminoalkanes (having 2 or more carbon atoms and 20 hereinafter) carboxylic acid, preferably aminoalkane (2 to 20 carbon atoms) carboxylic acid, more preferably aminoalkane (2 to 8 carbon atoms) carboxylic acid, etc.), lysine, hydroxylysine, arginine, cystine, etc. Polyaminocarboxylic acid (polyaminoalkane (2 to 20 carbon atoms) carboxylic acid, preferably polyaminoalkane (2 to 12 carbon atoms) carboxylic acid, etc.) Aromatic amino acids: for example, phenylalanine, arylalkanes such as tyrosine (carbon 2 or more and 20 or less) carboxylic acids, preferably aryl (6 or more and 10 or less carbon atoms) alkane (2 or more and 12 or less carbon atoms) carboxylic acids, etc. Heterocyclic amino acids: for example, tryptophan, histidine, proline, 4-hydroxyproline etc. Polypeptides in which these amino acids are polymerized with a low degree of polymerization (for example, a degree of polymerization of 9 or less): for example, glycylglycine, glutamylglycine, glycylglycylglycine, glycylproline, etc.

The amino acid salts include metal salts such as alkali metal salts (for example, sodium salts such as sodium glutamate), hydrochlorides such as arginine hydrochloride, and salts between amino acids (such as salts of lysine and glutamic acid). is mentioned. Aminosulfonic acids include aminosulfonic acids (sulfonic acids having an amino group), aminosulfonic acid salts (salts of aminosulfonic acids such as metal salts and hydrochlorides), and the like. The aminosulfonic acid may be either an aliphatic aminosulfonic acid, an aromatic aminosulfonic acid, or the like, and may be either an optically active form or a racemic form, as in the case of the above amino acids. Representative aminosulfonic acids include aliphatic aminosulfonic acids (e.g., aminoalkane (2 to 20 carbon atoms) sulfonic acids such as taurine, preferably aminoalkane (2 to 8 carbon atoms) sulfonic acids, more preferably is an aminoalkane (having 2 or more and 6 or less carbon atoms) and sulfonic acid).

The polysaccharide containing an amino group is not particularly limited as long as it is a glucan derivative and has an amino group as a substituent, but chitosan is a typical example. As for chitosan, at least part of the acetyl groups of chitin may be deacetylated, but the chitosan used in the present embodiment usually increases the selective removal rate of aldehydes (especially formaldehyde). Those with a high degree of deacetylation and many amino groups are preferred. The average degree of deacetylation of chitosan is, for example, usually 40% or more (for example, 50% or more and 99% or less), preferably 60% or more (for example, 65% or more and 98% or less), and more preferably 70% or more (for example, 75% or more). % or more and 99% or less), particularly preferably 80% or more (for example, 85% or more and 98% or less).

The "degree of deacetylation" of chitosan is expressed by the following formula 2, where A1 mol is the acetyl group of chitosan, and A2 mol is the deacetylated group (that is, amino group) of chitosan. Such acetylation degree can be analyzed by ¹ H-NMR, ¹³ C-NMR and the like.

In addition, the base dissociation constant pK _b of chitosan may be, for example, 5.5 or more, preferably 6 or more, and more preferably 6.5 or more at 25° C., and a higher aldehyde (especially formaldehyde) removal rate may be obtained. To obtain a ratio, it is usually 7 or more, preferably 7.5 or more, more preferably 8 or more.
The chitosan may be a derivatized chitosan derivative. Examples of such chitosan derivatives include chitosan salts (e.g., carboxylates such as pyrrolidone carboxylate, lactate, and alginate), hydroxylated chitosan [hydroxyl alkyl groups such as hydroxypropyl chitosan (hydroxyethyl group, hydroxyl propyl group, etc.), glyceryl chitosan, etc.], cationized chitosan, and the like. In the chitosan derivative, the OH group or CH ₂ OH group constituting the skeleton of chitosan is a protective group (or substituent) such as an alkyl group (such as an alkyl group such as a methyl group), an ester group (or an acyl group). , for example, an acetyl group, etc.) and the like are also included. Among such chitosan derivatives, chitosan salts, hydroxylated chitosan, cationized chitosan, etc. are often soluble in polar solvents [water, aqueous solvents (alcohol, etc.), etc.], and the chitosan solution described later can be efficiently can be prepared. The viscosity average degree of polymerization of the polysaccharide having an amino group (especially chitosan) can be selected from the range of 10 to 5000, for example, 100 to 3000, preferably 200 to 2000, more preferably 300 to 1500. There may be.

Polysaccharides having amino groups such as chitosan usually have a high degree of polymerization as described above, and have a relatively high solution viscosity even at a low concentration of, for example, about 1% by mass. In some cases, it is difficult to prepare a high-concentration solution, and when treating silica gel with such a polysaccharide with a high degree of polymerization, the necessary amount of amino group-containing polysaccharide to be attached to the silica gel (coating amount) may not be obtained.
Therefore, in this embodiment, a polysaccharide having a relatively low solution viscosity in a polysaccharide solution having an amino group may be used as the polysaccharide having an amino group. Such a polysaccharide having an amino group has a solution viscosity of, for example, 30 mPa s or less at 20° C. when it is a 1% by mass aqueous solution of acetic acid using an aqueous solution containing 1% by mass of acetic acid as a solvent. Polysaccharides (such as chitosan) having an amino group with a low molecular weight of preferably 0.5 mPa·s or more and 15 mPa·s or less, more preferably 1 mPa·s or more and 10 mPa·s or less may be used. The number average degree of polymerization of such polysaccharides having amino groups may be 3 or more and 100 or less, preferably 4 or more and 50 or less, more preferably 5 or more and 30 or less.
Polysaccharides having such a low-molecular-weight amino group, for example, using the method described in JP-A-3-220202, polysaccharides having amino groups are previously low-molecular weight (or depolymerized) ) can be obtained by Moreover, such a polysaccharide having a reduced molecular weight may be reduced in molecular weight in a polysaccharide solution having an amino group by the action of phosphoric acid, hydroxy acid, or the like, which will be described later.

The ratio of these amino compounds is, for example, 0.01 to 30 parts by mass, preferably 0.02 to 20 parts by mass, more preferably 0.03 to 20 parts by mass, relative to 100 parts by mass of silica gel. It may be 15 parts by mass or less, particularly 0.05 to 10 parts by mass. In this embodiment, depending on the type of amino compound and the type of silica gel, a very small amount, for example, 7 parts by mass or less (for example, 0.01 to 6 parts by mass) per 100 parts by mass of silica gel, is preferable. is 5 parts by mass or less (e.g., 0.02 parts by mass or more and 5 parts by mass or less), more preferably 4 parts by mass or less (e.g., 0.05 parts by mass or more and 3 parts by mass or less). can be selectively removed.
When the silica gel is in contact with the amino compound, it is sufficient that it contains the amino compound and silica gel, and the form of these components is not particularly limited, but it is preferable that at least the amino compound and silica gel are in contact. In particular, it may be a composite (or complex) of an amino compound and silica gel. In a preferred form, in the composition, the amino compound is attached to the surface of the silica gel, particularly preferably in the pores of the silica gel.

When mouthpiece portion 30 contains an amino compound together with silica gel, mouthpiece portion 30 may further contain a moisturizing agent (moisturizing component). By using the amino compound and silica gel in combination with the moisturizing agent, the selective removal of aldehydes can be further improved. It is considered that such an effect of improving selective removal of aldehydes by such a moisturizing agent is often greatly observed particularly in combination with silica gel having a relatively large pore size.
Moisturizers include polyols {diols [for example, alkanediols (ethylene glycol, propylene glycol, trimethylene glycol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, hexylene glycol, alkanediols having 2 to 10 carbon atoms, preferably alkanediols having 2 to 8 carbon atoms, more preferably alkanediols having 2 to 6 carbon atoms, particularly alkanediols having 2 to 4 carbon atoms, etc.), polyalkylene glycol (diethylene glycol, dipropylene glycol, triethylene glycol, alkylene glycol having di- or tetra-carbon atoms of 2 or more and 4 or less such as tripropylene glycol, etc.)], triols [alkanetriol (glycerin, 1,2,6- alkanetriols having 3 to 10 carbon atoms such as hexanetriol, preferably alkanetriols having 3 to 6 carbon atoms, more preferably alkanetriols having 3 to 4 carbon atoms), tetrafunctional or higher polyols [trifunctional Multimers of the above polyols (such as alkanetriols) (e.g., polyglycerols such as diglycerin and triglycerin)], derivatives of these polyols [e.g., dialkylene glycol monoalkyl ether (methyl carbitol, ethyl carbitol, etc.), (poly)alkylene glycol monoacylate (ethylene glycol monoacetate, etc.)] and the like.

Moisturizers also include components that are solid at room temperature (eg, 15° C. or higher and 25° C. or lower). Solid moisturizers include synthetic polymers having hydroxyl groups or ether bonds [polyvinyl alcohol, polyalkylene glycol (polyethylene oxide, polyethylene oxide-polypropylene oxide, etc.)], natural polymers (gelatin, dextrin, starch, etc.). , cellulose derivatives (hydroxyalkyl cellulose such as hydroxyethyl cellulose and hydroxypropyl cellulose, cellulose derivatives having a hydroxyl group such as alkyl-hydroxyalkyl cellulose such as ethyl hydroxyethyl cellulose, carboxyalkyl cellulose such as carboxymethyl cellulose, cellulose ethers such as ethyl cellulose, etc. ), carbohydrates (or sugars) [e.g., monosaccharides (e.g., xylose, glucose, etc.), disaccharides (cellobiose, trehalose, etc.), sugar alcohols (e.g., inositols such as inositol and bornesitol, xylitol, etc.)], etc. is mentioned.
These moisturizing agents may be used alone or in combination of two or more. Preferred humectants include polyols (especially trihydric or higher polyols such as glycerin).
The boiling point of the moisturizing agent (e.g., polyols) that is liquid at room temperature is, for example, 150° C. or higher (e.g., 180° C. or higher and 500° C. or lower), preferably 200° C. or higher (e.g., 210° C. or higher and 400° C. or lower). It is more preferably 220° C. or higher (eg, 230° C. or higher and 350° C. or lower), particularly 250° C. or higher (eg, 260° C. or higher and 320° C. or lower).
Moreover, the moisturizing agent may form a composition with at least silica gel and an amino compound, and may be in contact with the silica gel (and the amino compound). In a preferred embodiment, a humectant is present (or attached) within the pores of the silica gel.

The ratio of the moisturizing agent is, for example, 0.05 parts by mass to 15 parts by mass, preferably 0.1 parts by mass to 10 parts by mass, and more preferably 0.3 parts by mass to 100 parts by mass. It may be less than or equal to 0.5 parts by mass or more and 5 parts by mass or less, usually about 0.8 parts by mass or more and 3 parts by mass or less. The ratio of the moisturizing agent is 5 parts by mass or more and 1000 parts by mass or less, preferably 10 parts by mass or more and 500 parts by mass or less, and more preferably about 30 parts by mass or more and 300 parts by mass or less with respect to 100 parts by mass of the amino compound. There may be.

When a silica gel and an amino compound are present, a composition containing the silica gel and the amino compound can be prepared according to the content form of each component. It can be produced by contacting (or mixing) the components of
In particular, composites of amino compounds and silica gel (optionally with other ingredients such as humectants) [or silica gels containing amino compounds (and humectants), especially amino compounds (and humectants) in the pores of silica gel complex existing within], for example, a method of adding a solution or dispersion containing an amino compound (and other ingredients such as a humectant) to silica gel (addition method), an amino compound (and other ingredients such as a humectant) It can be prepared by a method of immersing silica gel in a solution or dispersion containing component). In the above addition method, the addition method is not particularly limited, and the solution or dispersion may be added by a method such as spraying or scattering onto the silica gel.

The solvent used for preparing the solution or dispersion is not particularly limited, and examples thereof include water, alcohols (e.g., alkanols such as methanol and ethanol, methyl cellosolve, ethyl cellosolve, butyl cellosolve, propylene glycol monomethyl ether, carbitols, etc.). etc.), ketones (acetone, methyl ethyl ketone, etc.), ethers (tetrahydrofuran, etc.), esters (ethyl acetate, butyl acetate, ethylene glycol monomethyl ether acetate, etc.), hydrocarbons (aliphatic or alicyclic hydrocarbons, aromatic hydrocarbons, halogenated hydrocarbons, etc.). In addition, when using a liquid moisturizing agent (polyols), the moisturizing agent can also be used as a solvent. These solvents may be used alone or in combination of two or more. Solvents are usually composed of polar solvents such as water and alkanols in many cases.
In the solution or dispersion, the ratio of the solid content [amino compound (and other components such as moisturizing agents)] is, for example, 0.05% by mass or more and 50% by mass or less, preferably 0.1% by mass or more and 30% by mass. % by mass or less, more preferably 0.5% by mass or more and 20% by mass or less. In addition, the silica gel after the adhesion treatment or after being present in the pores may be subjected to a drying treatment in order to remove the solvent. Vacuum drying, hot air drying, or the like can be used for the drying treatment.

[Position of silica gel]
As described above, the stick contains silica gel in at least one of the cooling portion 20 and the mouthpiece portion 30 . It may be located in both the cooling section 20 and the mouthpiece section 30, but is preferably located in the mouthpiece section 30. FIG. As described above, the silica gel to be used preferably has at least one of the aspect having a substituent such as an amino group and the aspect forming a complex with an amino compound or the like.
The location and mode of silica gel presence are not particularly limited, but the main locations and modes of presence are as follows.
1) Inside Filter 31 of Mouthpiece Part 30 Silica gel is most typically contained inside filter 31 . In this case, it is usually contained within the filter material.
When the filter 31 is composed of one segment as shown in FIG. 1, the silica gel may be contained uniformly within the filter, or may be provided with a concentration gradient, and may be distributed at specific positions within the filter. High concentrations may be present. When providing a concentration gradient or increasing the concentration at a specific position, it is preferable to remove smoking taste inhibiting components in the product at a position farther from the user. side) is preferred.
In addition, when the filter is composed of a plurality of segments, silica gel can be present in any of the segments. Therefore, it is preferable that a large amount of silica gel be present in the segment on the cooling section 20 side (first side) in the filter 31 .

2) In the paper layer of the paper 32 around which the filter 31 is wound or on the surface facing the filter Silica gel may be contained in the paper 32 around which the filter 31 is wound. In this case, when manufacturing the paper roll 32 , it is preferable to add silica gel having a particle size smaller than the thickness of the paper roll 32 and to include it in the paper layers constituting the paper roll 32 .
Alternatively, it may be arranged on the surface of the paper roll 32 facing the filter 31 . In this case, the silica gel may be adhered to the surface of the paper roll 32 facing the filter with an adhesive, and when the coating agent is applied to the surface of the paper roll 32, the silica gel is present on the desired surface along with the coating agent when the silica gel is manufactured. You may let

3) Inside Hollow Part of Mouthpiece Part 30 Silica gel may exist inside the hollow part of the mouthpiece part 30 . The hollow portion may be the hollow portion provided in the center hole portion 35 shown in the schematic diagram of FIG. 3A, or may be another hollow portion. In this case, the silica gel may be completely filled in the hollow portion or may be partially filled in the hollow portion. When the hollow portion has an opening to the cooling portion 20 as shown in FIG. 3A, it is preferable to close the opening of the hollow portion with thin paper, filter material, or the like so as not to leak to the cooling portion.
4) Surface Facing Hollow Part of Mouthpiece Part 30 Silica gel may be present on the surface of the hollow part of the mouthpiece part 30 . The hollow portion may be the hollow portion provided in the center hole portion 35 shown in FIG. 3(a), or may be another hollow portion. In this case, the silica gel may be adhered to the hollow portion side of the filling layer 33 in the center hole portion with an adhesive, or the silica gel may be molded so as to cover part or all of the hollow portion of the filling layer.

5) Filter 31 has a plurality of segments, in cavity 37 formed between segments Silica gel is formed between filters 31 consisting of a plurality of segments, as shown in the schematic diagram of FIG. 3(b). It may be placed in a closed cavity 37 . In this case, the silica gel may fill the cavity 37 with particles, or the silica gel may be formed into the shape of the cavity 37 and arranged in the order of filter-silica gel-filter.
Although the filter 31 has two segments in FIG. 3(b), the filter 31 may have three or more segments, and silica gel may be placed in each of a plurality of cavities formed between the filters.

6) Others Silica gel may exist in the cooling unit 20 . When the cooling part 20 has the openings V, it is possible to use silica gel having a particle size larger than the width of the openings V or silica gel molded to be larger than the width of the openings V, from the viewpoint of not coming out of the stick. preferable. A layer of a porous molded body made of silica gel may be arranged between the cooling section 20 and the mouthpiece section 30 so as to cover the filter material of the mouthpiece section 30, or the molded body may be placed in the cooling section 20. and may be arranged on the base material portion 10 .
Also, the cooling part 20 may be present in the forming paper 21 for forming. For example, silica gel having a particle size smaller than the thickness of the molding paper 21 may be used during manufacturing and present in the paper layers of the molding paper 21, and may adhere to the inside of wrinkles, folds, etc. during molding with an adhesive. It may be present together with the treatment agent when applying a surface treatment agent such as a coating agent.
Furthermore, part of the silica gel may be present together with an aerosol source or the like in the substrate portion 10 so that the heating product in the substrate portion 10 and the silica gel in the substrate portion 10 are brought into contact with each other.
By allowing silica gel to be present in the stick in these locations and modes, the non-combustion heating stick whose heating temperature is high removes taste-inhibiting components such as aldehydes while maintaining the satisfaction of the user. can do.

[Addition of silica gel]
Regarding the addition of silica gel, the case where silica gel, which is a preferable example, is used for the filter 31 will be described.
The amount of silica gel added to the filter material of the filter 31 is 15.0% as the value of "specific surface area of silica gel x weight of silica gel/cross-sectional area of filter in the direction perpendicular to the ventilation direction" for one non-combustion heating stick. 0 m ² /cm ² or more and 80.0 m ² /cm ² or less are preferable.
For the sake of convenience, the above "specific surface area of silica gel×weight of silica gel/cross-sectional area of the filter perpendicular to the ventilation direction" may be expressed as "surface area of silica gel per unit cross-sectional area". The surface area of the silica gel per unit cross-sectional area can be calculated based on the specific surface area of the silica gel added to the filter possessed by one non-combustion heating stick, the weight of the added silica gel, and the cross-sectional area of the filter. Since silica gel may not be uniformly dispersed in the filter to which it is added, it is required that the above range be satisfied in all cross sections of the filter (cross sections perpendicular to the airflow direction). not a thing
In the present embodiment, the surface area of the silica gel per unit cross-sectional area is within the above range, so that the desired amount of the component generated by heating can be delivered to the user, and the desired flavor feeling can be imparted to the user. can give. If the surface area of the silica gel per unit cross-sectional area is smaller than the lower limit of the above range, there is a tendency that the effect of adding the silica gel cannot be sufficiently obtained. On the other hand, when the surface area of the silica gel per unit cross-sectional area is larger than the upper limit of the above range, the components generated by heating tend to be reduced more than necessary.
The surface area of the silica gel per unit cross-sectional area is more preferably 17.0 m ² /cm ² or more, and even more preferably 35.0 m ² /cm ² or more. On the other hand, it is more preferably 77.0 m ² /cm ² or less, even more preferably 73.0 m ² /cm ² or less.
The surface area of silica gel per unit cross-sectional area can be adjusted, for example, by adjusting the specific surface area of silica gel, the amount of silica gel added, and the cross-sectional area of the filter in the direction perpendicular to the ventilation direction.
The calculation of the surface area of silica gel per unit cross-sectional area is based on the filter to which silica gel is added. If the mouthpiece consists of a plurality of filters, the cross-sectional area and length of only the filter to which silica gel is added are used as standards.

In the present embodiment, the amount of silica gel added per unit length in the ventilation direction of the filter added with silica gel is preferably 5 mg/cm or more and 50 mg/cm or less, and more preferably 8 mg/cm or more and 40 mg/cm or less. more preferably 10 mg/cm or more and 35 mg/cm or less.
In the present embodiment, when the specific surface area of silica gel and the amount of silica gel added are within the above ranges, the surface area of silica gel per unit cross-sectional area can be adjusted to a desired value.

An example of the non-combustion heating stick according to this embodiment will be described below with reference to FIG.
The stick 1 consists of the following members, and the whole cooling part 20 and mouthpiece part 30 and 5 mm of the cooling part 20 side of the base part 10 are wrapped with tip paper 40, and the stick 1 with a total length of 60 mm in the center line direction is obtained. It was adjusted.
・ Base material part 10 (thing wound with wrapping paper 12.)
Centerline direction length h: 20mm
Cross section width w: 3.5mm
Aerosol source content: 0.8 mg
・Cooling part 20 length in the center line direction: 20 mm
・Mouthpiece section 30
Center line length: 20mm
The mouthpiece portion 30 contains the following two types of filter materials.
Center hole filter (through hole diameter: 4.5 mm)
Cellulose acetate fiber filter 20 mg of silica gel (average particle size: 750 μm, average pore size: 80 nm, total nitrogen content in silica gel: 1.50% by mass) having 3-aminopropylsilyl groups in the center hole filter material. dispersed.

REFERENCE SIGNS LIST 1 non-combustion heating stick, 10 base material portion, 11 aerosol source, 20 cooling portion, 30 mouthpiece portion, 31 filter, 33 filling layer, 35 center hole portion, 37 cavity, 40 … chipping paper

Claims

a substrate portion comprising an aerosol source;
a cooling unit that cools vapor generated by heating the base material to generate an aerosol;
a mouthpiece portion disposed at a site through which the aerosol passes;
with
A non-combustion heating stick containing silica gel in at least one of the cooling portion and the mouthpiece portion.
The non-combustion heating stick according to claim 1, wherein the silica gel has an amino group as a substituent or forms a composite with an amino compound.
The substituent has the formula: NR 2 —(CH 2 ) n —
(Here, each R is independently selected from the group consisting of H, an allyl group, and an alkyl group having 1 to 5 carbon atoms, and n is any integer of 1 to 40)
3. The non-combustion heated stick of claim 2, represented by .
3. The non-combustion heating stick according to claim 2, wherein the amino compound is one or more compounds selected from the group consisting of amino acids, aminosulfonic acids, and polysaccharides having amino groups.
5. The non-combustion heating stick according to claim 2 or 4, wherein the amino compound is present in pores of the silica gel.
The non-combustion heating stick according to any one of claims 1 to 5, wherein the silica gel has an average pore size of 5 nm or more and 350 nm or less.
The non-combustion heating stick according to any one of claims 1 to 6, wherein the silica gel has an average particle size of 35 µm or more and 2500 µm or less.
The non-combustion heating stick according to any one of claims 2, 3, 6 and 7, wherein the silica gel has a total nitrogen content of 0.20% by mass or more and 1.00% by mass or less.
6. The non-combustion heating stick according to any one of claims 2, 4 and 5, wherein the ratio of said amino compound is 0.01 parts by mass or more and 30 parts by mass or less with respect to 100 parts by mass of said silica gel.
The silica gel is present in one or more of the following 1) to 5): 1) in the filter of the mouthpiece part; 3) within a hollow of the mouthpiece portion; 4) a surface facing the hollow; 5) within a cavity formed between the segments, wherein the filter comprises a plurality of segments. Non-combustion heating stick.