WO2025150110A1 - Stick for flavor inhalation, and flavor inhalation system - Google Patents

Abstract

This stick 1 is a non-combustion heating type stick which is for flavor inhalation and used while being heated by a heating device, the stick 1 comprising: a base material part 10 that includes a flavor source 11; and a cooling part 20 that cools steam and/or aerosol generated by heating the base material part 10 during use, and maintains an internal temperature at a temperature greater than 100°C.

Description

Flavor inhalation stick and flavor inhalation system

This disclosure relates to a flavor inhalation stick and a flavor inhalation system.

Patent Document 1 describes a non-combustion heated tobacco having a tobacco rod section, a mouthpiece section, and a wrapping section in which the tobacco section and the mouthpiece section are wrapped with tipping paper, with a lip release agent being applied to at least a portion of the tipping paper. Patent Document 1 discloses that the wrapping section is composed of a first region including the mouth-side end of the non-combustion heated tobacco and a second region located closer to the tobacco rod section of the wrapping section than the first region, and that the content of lip release agent per unit area in the second region is less than the content of lip release agent per unit area in the first region. Patent Document 1 also discloses that the mouthpiece section includes a cooling section.

JP 2022-82658 A

In a non-combustion heating type flavor inhalation stick that is heated by a heating device, high-temperature steam or aerosol generated by heating is cooled before being delivered to the user's mouth. In addition, the components delivered to the user's mouth may contain not only components that improve the flavor and aroma, but also components that have undesirable effects on the flavor and aroma. The present inventors have found that the temperature of the steam or aerosol affects the filtration rate of these components in the flavor inhalation stick.
An object of the present disclosure is to provide a flavor inhalation stick and a flavor inhalation system that selectively filters components generated by heating.

One form of the present disclosure provides a non-combustion heating type flavor inhalation stick that is heated by a heating device when used, the flavor inhalation stick comprising: a base portion containing a flavor source; and a cooling portion that, during use, cools vapor and/or aerosol generated by heating the base portion and maintains an internal temperature at a temperature higher than 100°C.
The cooling section may maintain the internal temperature during use at a temperature greater than 100° C. and less than or equal to 200° C. at the coldest point within the cooling section.
The cooling section may maintain the internal temperature during use at a temperature higher than 100° C. and lower than 200° C. at a location in the cooling section that is farthest from the base section.
Furthermore, when the cooling portion is configured with a cylindrical member formed in a cylindrical shape, the internal temperature may be the temperature of the inner wall of the cylindrical member.
The cooling portion may include at least one of aluminum laminated paper, copper foil, and carbon paper.
Furthermore, a communication passage that connects the outside and the inside may be formed downstream of the center of the cooling section in the longitudinal direction of the region in which the cooling section is disposed.
The cooling unit may further include a filter unit having a first filter that has a hollow portion and is adjacent to the downstream side of the cooling unit, and a solid second filter that is adjacent to the downstream side of the first filter.
Furthermore, as one embodiment of the present disclosure, there is provided a flavor inhalation system including the flavor inhalation stick and a heating device that heats the flavor inhalation stick.

The present disclosure provides a flavor inhalation stick and a flavor inhalation system that selectively filters components generated by heating.

FIG. 1 is a diagram showing an example of a vertical cross section of a flavor inhalation stick. FIG. 2 is a schematic diagram showing an example of an internal configuration of a heating device. FIG. 1 shows an example and a comparative example of a flavor inhalation stick according to the first embodiment, in which (A) is a longitudinal cross-section of a stick according to the example, and (B) is a longitudinal cross-section of a stick according to the first comparative example. 1A and 1B are diagrams showing other comparative examples of the flavor inhalation stick according to the first embodiment, in which (A) is a longitudinal section of a stick according to a second comparative example, and (B) is a longitudinal section of a stick according to a third comparative example. FIG. 13 is a diagram showing a comparison result of the internal temperature when the configuration of the cooling part is changed. FIG. 1 is a graph showing the relationship between internal temperature and the filtration rate of various components, in which (A) shows the filtration rate of nicotine, (B) shows the filtration rate of NNN, and (C) shows the filtration rate of NNK. FIG. 1 shows a comparison of nicotine delivery when the cooling section has a different configuration, where (A) shows the nicotine filtration rate and (B) shows the amount of nicotine released. 13A and 13B are diagrams showing the comparison results of the filtration rate of TSNA when the configuration of the cooling section is changed, in which (A) shows the filtration rate of NNN and (B) shows the filtration rate of NNK. FIG. 1 shows a comparison of the amount of TSNA released when the configuration of the flavor inhalation stick is changed, where (A) shows the amount of NNN released and (B) shows the amount of NNK released. FIG. 4 is a diagram showing a longitudinal section of a flavor inhalation stick according to a second embodiment. FIG. 11 is a diagram showing a longitudinal section of a flavor inhalation stick according to a third embodiment.

Below, an embodiment of the present disclosure will be described in detail with reference to the attached drawings. In each drawing, the same parts are denoted by the same reference numerals.

First Embodiment
FIG. 1 is a diagram showing an example of a vertical cross section of a flavor inhalation stick 1. As shown in FIG.
FIG. 2 is a schematic diagram showing an example of the internal configuration of the heating device 100. As shown in FIG.
The flavor inhalation system according to the present embodiment includes a flavor inhalation stick (hereinafter, sometimes referred to as a "stick") 1 and a non-combustion heating type heating device 100 that heats the substrate part 10 of the stick 1 from the outside. The stick 1 is inserted into the non-combustion heating type heating device 100 for use. The stick 1 includes a substrate part 10 and a cooling part 20. The stick 1 also includes a filter part 30. The stick 1 also includes a tip paper 40 that connects the substrate part 10, the cooling part 20, and the filter part 30. The tip paper 40 is formed with a communication passage 60 that connects the outside and the inside of the stick 1. Hereinafter, the direction of the center line CL of the substrate part 10 may be referred to as the "center line direction". The tip paper 40 is wound around the stick 1 so as to integrate the substrate part 10, the cooling part 20, and the filter part 30 in the state of being arranged in this order in the center line direction.

In this specification, one end side in the center line direction (left side in FIG. 1) may be referred to as the first side, and the other end side in the center line direction (right side in FIG. 1) may be referred to as the second side. The first side is the end side that is inserted into heating device 100. The second side is the end side opposite the first side that the user holds in their mouth for inhalation. In addition, a cross section along the center line direction is referred to as a "longitudinal cross section," and a cross section cut along a plane perpendicular to the center line direction is defined as a "transverse cross section."

(Heating device 100)
In the example shown in Fig. 2, the heating device 100 includes a power supply unit 111 that accumulates power and supplies power to each component of the heating device 100, a sensor unit 112 that detects various information related to the heating device 100, and a notification unit 113 that notifies the user of the information. The heating device 100 also includes a memory unit 114 that stores various information for the operation of the heating device 100, a communication unit 115 for transmitting and receiving information between the heating device 100 and other devices, and a control unit 116 that controls the overall operation within the heating device 100. The heating 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 space 141 with the outside, and a heat insulating unit 144 that prevents heat transfer from the heating unit 121 to other components of the heating device 100. In the heating device 100, the user inhales with the stick 1 held in the holding unit 140.

The heating unit 121 heats the base material 10 of the stick 1. The heating unit 121 is made of any material, such as metal or polyimide. For example, the heating unit 121 is configured in a film shape and arranged to cover the outer periphery of the holding unit 140. When the heating unit 121 generates heat, the flavor source 11 contained in the stick 1 is heated from the outer periphery of the stick 1. The heating unit 121 generates heat when power is supplied from the power supply unit 111. As an example, power may be supplied when the sensor unit 112 detects that a specific user input has been made. When the temperature of the stick 1 heated by the heating unit 121 reaches a specific temperature, the user can inhale. Thereafter, when the sensor unit 112 detects that a specific user input has been made, power supply may be stopped. As another example, power may be supplied and an aerosol may be generated during the period in which the sensor unit 112 detects that the user has inhaled.

The insulating section 144 is arranged so as to cover at least the outer periphery of the heating section 121. For example, the insulating section 144 is made of a vacuum insulating material, an aerogel insulating material, or the like. Note that a vacuum insulating material is an insulating material in which, for example, glass wool and silica (silicon powder) are wrapped in a resin film and placed in a high vacuum state, thereby reducing the thermal conduction of gas to as close to zero as possible.

(Stick 1)
The stick 1 can be exemplified as a non-combustion heating type flavor inhalation article that releases flavor components when the base material portion 10 is heated. The cross section of the stick 1 is, for example, substantially circular, and the outer diameter and the size in the center line direction can be appropriately changed according to a desired size.

((Base material part 10))
The substrate 10 is a portion where aerosol is generated by heating. The substrate 10 has a flavor source 11 that generates aerosol by heating, and a wrapping paper 12 that covers the outer periphery of the flavor source 11. The substrate 10 is formed, for example, in a cylindrical shape. The substrate 10 is connected (coupled) to the cooling section 20 by winding the substrate 10 and the cooling section 20 together using tipping paper 40.
The cross-sectional area and the size in the center line direction of the substrate 10 can be appropriately changed according to the size of the stick 1. At least a portion of the substrate 10 is accommodated in the space 141 of the holding part 140 when the stick 1 is held by the holding part 140.
In addition, a member separate from the base material portion 10 may be disposed on the first side (upstream side) of the base material portion 10. This separate member is, for example, a member that prevents the flavor source 11 from falling off from the end face of the base material portion 10 on the first side.

The content of the flavor source 11 contained in the base material portion 10 can be appropriately changed according to the size of the stick 1.
The flavor source 11 may be derived from tobacco, such as dried tobacco leaves (dried tobacco leaves) or processed products obtained by forming tobacco shreds or tobacco raw materials into granules, sheets, or powder. The flavor source 11 may also include non-tobacco-derived products made from plants other than tobacco (e.g., mint and herbs). The flavor source 11 may also include a flavoring. The flavor source 11 may also include dried tobacco leaves and a flavoring-containing material in which a flavoring is contained in a polysaccharide gel. The type of flavoring is not particularly limited, and menthol is particularly preferred from the viewpoint of imparting a good flavor. The flavoring contained in the flavor source 11 may be used alone or in combination of two or more types. In addition, when the heating device 100 is a medical inhaler, the flavor source 11 may include a medicine for the patient to inhale.
The components constituting the flavor source 11 are not limited to solid materials, and may include, for example, polyhydric alcohols such as glycerin and propylene glycol, and liquid materials such as water. The form of the flavor source 11 is not limited to solid or semi-solid, and may be, for example, a capsule containing a liquid material.

Furthermore, when the flavor source 11 is derived from tobacco, the type of tobacco used is not particularly limited, and various known types can be used. Examples of the types of tobacco include flue-cured tobacco, burley tobacco, oriental tobacco, native tobacco, other Nicotiana tabacum varieties, Nicotiana rustica varieties, and mixtures thereof. The mixtures are used by appropriately blending the varieties to achieve the desired flavor.
In addition, even when the flavor source 11 is derived from tobacco, it may contain various extracts from natural products and/or their constituents depending on the application. Examples of the extracts and/or their constituents include glycerin, propylene glycol, triacetin, 1,3-butanediol, and mixtures thereof.

Furthermore, when the flavor source 11 is a processed product in which tobacco shreds or tobacco raw materials are formed into a sheet (hereinafter referred to as "tobacco sheet"), it can be appropriately manufactured by known methods such as papermaking, slurrying, rolling, etc. Furthermore, the tobacco sheet may be made by grinding dried tobacco leaves to produce tobacco pulverized material, homogenizing this using known means, and processing it into a sheet. The number of tobacco sheets may be one sheet or two or more sheets. The two or more tobacco sheets may all have the same composition or physical properties, or some or all of the tobacco sheets may have different compositions or physical properties. Furthermore, the thickness of each tobacco sheet may be the same or different.

When the flavor source 11 is composed of one tobacco sheet, for example, a tobacco sheet having one side of the same size as the size of the center line direction of the substrate 10 may be filled in a state where it is folded back multiple times horizontally to the center line direction of the substrate 10 (so-called gathered sheet). Another example is a tobacco sheet having one side of the same size as the size of the center line direction of the substrate 10, rolled in a direction perpendicular to the center line direction of the substrate 10.
In the case where the flavor source 11 is composed of two or more tobacco sheets, for example, a plurality of tobacco sheets, one side of which has a size approximately equal to the size of the center line direction of the substrate part 10, are packed in a state of being wound in a direction perpendicular to the center line direction of the substrate part 10 so as to be concentrically arranged. "Concentrically arranged" means that the centers of all the tobacco sheets are arranged at approximately the same position.
The flavor source 11 may also be a shredded tobacco sheet. Furthermore, the flavor source 11 may be a so-called strand type, in which a tobacco sheet having a size approximately equal to the size of the base material 10 in the center line direction is shredded approximately horizontally to the center line direction and filled.

The configuration of the cigarette paper 12 is not particularly limited and may be of a general form, for example, one containing pulp as a main component. Pulp may be made from wood pulp such as softwood pulp or hardwood pulp, or may be made by mixing non-wood pulp that is generally used for cigarette paper 12 for tobacco products, such as flax pulp, hemp pulp, sisal pulp, or esparto. Types of pulp that can be used include chemical pulp produced by the kraft cooking method, acidic/neutral/alkali sulfite cooking method, soda salt cooking method, etc., ground pulp, chemi-ground pulp, thermomechanical pulp, etc.
The cigarette paper 12 may contain a filler, for example, calcium carbonate from the viewpoint of improving whiteness and opacity and increasing the heating rate. The cigarette paper 12 may also contain various auxiliary agents, and may have a coating agent added to at least one of the two surfaces, the front surface and the back surface.

The shape of the wrapping paper 12 for producing the substrate 10 can be, for example, a square or a rectangle. The size of the wrapping paper 12 can be determined depending on the size of the substrate 10.
When the base material 10 is wrapped in the wrapping paper 12 into a cylindrical shape, for example, an end of the wrapping paper 12 and an end of the wrapping paper 12 on the opposite side are overlapped by about 2 mm in the circumferential direction and glued together to form a cylindrical paper tube shape filled with the flavor source 11. In addition, when a cylindrical paper tube is formed in advance by the wrapping paper 12, the flavor source 11 may be filled in the paper tube formed by the wrapping paper 12, for example.

((Filter unit 30))
The filter section 30 is located on the second side (downstream side) of the cooling section 20. The filter section 30 has a first filter 31 connected to the second side of the cooling section 20, and a second filter 32 located on the second side of the first filter 31. The first filter 31 has a hollow cross section, and the second filter 32 has a solid cross section. The first filter 31 is a filter having a hollow portion at approximately the center of the cross section along the center line direction, that is, a so-called center hole filter.
The filter unit 30 has the second end of the cooling unit 20 and the first end of the filter unit 30 wound together using tipping paper 40, thereby connecting (coupling) them. The filter unit 30 may also have wrapping paper 33 wound between the outer circumferential surfaces of the first filter 31 and the second filter 32 and the tipping paper 40. When the filter unit 30 has two or more filters, each of these two or more filters may be wrapped in a different wrapping paper before being wrapped together with the wrapping paper 33.
The filter unit 30 may be a plain filter made up of a single filter, or a multi-segment filter made up of three or more types of filters.

The cross sections of the first filter 31 and the second filter 32 of the filter unit 30 are substantially circular, and the diameter of the circle and the perimeter of the cross section can be appropriately changed according to the size of the product. If the cross section is not circular, the above diameter is assumed to be a circle having the same area as the cross section, and the diameter of the circle is applied.
The size of the filter part 30 in the center line direction can be appropriately changed according to the size of the stick 1, but is usually 5.0 mm to 35.0 mm, preferably 10.0 mm to 30.0 mm, and more preferably 15.0 mm to 25.0 mm. The shapes and dimensions of the first filter 31 and the second filter 32 can be appropriately adjusted so that the shape and dimensions of the filter part 30 are within the above ranges.

The airflow resistance per 120 mm of size in the center line direction of the second filter 32 is not particularly limited, but is usually 40 _mmH2O or more and 300 _mmH2O or less, preferably 70 _mmH2O or more and 280 _mmH2O or less, and more preferably 90 _mmH2O or more and 260 _mmH2O or less.
The airflow resistance is measured according to the ISO standard method (ISO6565) using, for example, a filter airflow resistance measuring device manufactured by Cerulean Co., Ltd. The airflow resistance of the filter unit 30 refers to the air pressure difference between the first side and the second side when air is allowed to flow at a predetermined air flow rate (17.5 cc/min) from the first side to the second side in a state in which air does not pass through the sides of the filter unit _30. The unit is generally expressed in mmH2O.

The first filter 31 and the second filter 32 are not particularly limited as long as they contain a filter material and have a general function of a filter. Examples of the general function of a filter include reducing undesirable sensations such as irritation, reducing nicotine and tar, and the like, but it is not necessary for them to have all of these functions. In addition, in the stick 1, which tends to produce fewer components and has a lower filling rate of the flavor source 11 in the base material 10 compared to cigarette products, preventing the flavor source 11 from falling off while suppressing the filtering function and adjusting the airflow resistance to provide appropriate ease of inhalation when inhaling are also important functions.
The filter material constituting the first filter 31 and the second filter 32 is, for example, a filler such as acetate, charcoal, cellulose fiber, nonwoven fabric, pulp paper, etc., formed into a columnar shape. Alternatively, a paper filter filled with sheet-like pulp paper may be used. The first filter 31 and the second filter 32 may also contain, as appropriate, known flavors (e.g., menthol), adsorbents, granular activated carbon, flavor retention materials, etc.

The material of the wrapping paper 33 can be, for example, one whose main component is pulp. In addition to being made from wood pulp such as softwood pulp or hardwood pulp, the pulp may also be made by mixing non-wood pulp that is generally used in wrapping papers for tobacco products, such as flax pulp, hemp pulp, sisal pulp, and esparto. These pulps may be used alone or in combination of multiple types in any ratio. They may also contain fillers such as calcium carbonate.

The embodiment of the paper wrapper 33 is not particularly limited, and may include one or more rows of adhesive-containing seams. The adhesive may include a hot melt adhesive, and the hot melt adhesive may further include polyvinyl alcohol. The adhesive may also include a vinyl acetate-based adhesive.
Furthermore, the wrapper paper 33 may be either coated or uncoated, but is preferably coated with a desired material from the standpoint of imparting functions such as strength and structural rigidity.
The wrapping paper 33 may be a plastic, polymeric sheet, etc. The wrapping paper 33 may be a porous member having a plurality of pores formed therein.

((Tipping Paper 40))
The tipping paper 40 is wound around the outer peripheral surfaces of the base material portion 10, the cooling portion 20, and the filter portion 30. The shape of the tipping paper 40 is not particularly limited, and is, for example, a square or a rectangle.
The configuration of the tipping paper 40 is not particularly limited and may be a general embodiment, for example, one in which pulp is the main component. The pulp may be made of wood pulp such as softwood pulp or hardwood pulp, or may be made by mixing non-wood pulp generally used in cigarette papers for tobacco products, such as flax pulp, hemp pulp, sisal pulp, and esparto. These pulps may be used alone or in combination of multiple types in any ratio. The tipping paper 40 may contain a filler, such as calcium carbonate, from the viewpoint of improving whiteness and opacity and increasing the heating rate. The tipping paper 40 may contain various auxiliaries, such as a water resistance improver including a wet strength agent (WS agent) and a sizing agent.

The air permeability of the tipping paper 40 is not particularly limited, but is usually 0 Coresta units or more and 30,000 Coresta units or less, and preferably more than 0 Coresta units and 10,000 Coresta units or less. "Air permeability" is a value measured in accordance with ISO 2965:2009, and is expressed as the flow rate ( ^cm3 ) of gas passing through an area of 1 ^cm2 per minute when the differential pressure between both sides of the paper is 1 kPa. 1 Coresta unit (1 Coresta unit, 1 C.U.) is ^cm3 /(min· ^cm2 ) under 1 kPa.

A coating agent may be added to at least one of the two surfaces, the front surface and the back surface, of the tipping paper 40. There are no particular limitations on the coating agent for the tipping paper 40, but a coating agent that can form a film on the surface and reduce the permeability of liquids is preferred.
Also, a part of the outer surface of the tipping paper 40 may be covered with a known lip release material. The lip release material refers to a material configured to assist in the easy release of contact between the lips and the tipping paper 40 without substantial adhesion when the user holds the filter portion 30 of the stick 1 in the mouth. The lip release material may contain, for example, ethyl cellulose, methyl cellulose, etc. For example, the outer surface of the tipping paper 40 may be coated with the lip release material by applying an ethyl cellulose-based or methyl cellulose-based ink to the outer surface of the tipping paper.

((Communication path 60))
The communication passage 60 communicates between the outside and the inside of the stick 1. Therefore, when inhaled, the communication passage 60 allows air outside the stick 1 to flow into the inside. The shape of the communication passage 60 can be, for example, a circular cylinder, an elliptical cylinder, a polygonal prism, a polygonal prism with rounded corners, or a mortar shape.
The communication passages 60 are formed by through holes (also referred to as "ventilation filters (Vf)" in this technical field) formed at least in the region of the tipping paper 40 where the cooling section 20 is arranged. In the example shown in Fig. 1, a plurality of communication passages 60 are formed in the cooling section 20, and are formed in the circumferential direction of the cooling section 20 and concentrically.
The communication passages 60 are not limited to being formed around the entire circumference of the cooling section 20, but may be formed in a portion of the circumference of the cooling section 20. In addition, if a plurality of concentric communication passages 60 are regarded as one communication passage group, the number of communication passage groups may be one or may be two or more.

The existence of a communication passage 60 that connects the outside and inside of the stick 1 allows air to flow from the outside into the inside of the cooling section 20 when the user inhales on the stick 1. This makes it possible to adjust the concentration of the inhaled flavor components and aerosol. It also promotes cooling of the steam flowing in from the base section 10 and the air inside the cooling section 20. In addition, when the base section 10 is heated, the steam generated using the aerosol as a condensation nucleus comes into contact with the air from the outside and is cooled, liquefying, promoting the generation of the aerosol.

It is preferable that the position of the communication passage 60 in the center line direction be a position where air can flow in from outside the stick 1, for example a position within the area protruding from the insertion port 142 when the stick 1 is held in the holding portion 140 of the heating device 100.
The communication passage 60 is provided so that the air inflow rate from the communication passage 60 when inhaled at 17.5 ml/sec by an automatic smoking machine is 10% by volume or more and 90% by volume or less. This "air inflow rate" is the volume rate of air inflowing from the communication passage 60 when the rate of air inhaled from the end of the second side of the stick 1 is taken as 100% by volume. The air inflow rate 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. These air inflow rates can be achieved, for example, by selecting the number of communication passages 60 per communication passage group from the range of 5 to 50, selecting the diameter of the opening of the communication passage 60 from the range of 0.1 mm to 0.5 mm, and combining these selections.
The air inflow ratio can be measured by a method conforming to ISO9512 using a winding quality measuring device (for example, SODIMAX D74/SODIM manufactured by SAS).

The communication path 60 is composed of a through hole formed in the tipping paper 40 and a through hole formed in the cooling section 20. The through hole is formed, for example, by a laser. The through hole in the tipping paper 40 is preferably formed directly above the through hole formed in the cooling section 20. When making such a stick 1, a tipping paper 40 with a through hole that overlaps with the through hole of the cooling section 20 may be prepared and wound, but from the viewpoint of ease of manufacture, it is preferable to make a stick 1 without a communication path 60 and then open a hole that penetrates the cooling section 20 and the tipping paper 40 at the same time. Note that the intensity of the laser light irradiated after wrapping the tipping paper 40 around the cooling section 20 may be an intensity that penetrates the tipping paper 40 but not the cooling section 20. Even in this case, if the cooling section 20 has a plurality of pores and is breathable, the through hole in the tipping paper 40 and the pores in the cooling section 20 form a communication path 60 that connects the outside of the stick 1 to the inside of the cooling section 20.

((Cooling section 20))
The cooling section 20 is disposed adjacent to the base material section 10 and the filter section 30. The cooling section 20 has a first sheet 21 rolled into a cylindrical shape so that the cross section is hollow (hollow), and a second sheet 22 provided inside the first sheet 21. The cooling section 20 is a cylindrical member formed into a cylindrical shape. The cooling section 20 is not directly heated by the heating section 121 (see FIG. 2 ) of the heating device 100. In addition, a communication passage 60 is formed in the cooling section 20.

The cooling unit 20 is a part that cools the vapor and/or aerosol generated by heating the base unit 10 and maintains the internal temperature at a temperature higher than 100° C. when the stick 1 is in use. In other words, the cooling unit 20 is a part that cools the vapor and/or aerosol generated by heating the base unit 10 while maintaining the internal temperature at a temperature higher than 100° C. when the stick 1 is in use. "When the stick 1 is in use" refers to the time when the stick 1 is inserted into the heating device 100 and the vapor and/or aerosol generated by heating the base unit 10 is present inside the cooling unit 20. For example, this refers to the time when the user inserts the stick 1 into the heating device 100 to heat it and inhale the aerosol.
Specifically, the cooling section 20 is a section that maintains the internal temperature of the coldest part at a temperature higher than 100° C. when the stick 1 is in use. The cooling section 20 may also be a section that maintains the internal temperature of the part in the cooling section 20 that is farthest from the base material part 10 at a temperature higher than 100° C. when the stick 1 is in use. Examples of the internal temperature of the cooling section 20 include the temperature of the inner wall of the first sheet 21, the temperature of the second sheet 22 itself, and the temperature of the inner wall of the second sheet 22.

Since the cooling unit 20 is a cylindrical member, the steam generated by heating the base member 10 can be cooled by contacting it with air. Then, the steam is cooled by contacting it with air, whereby an aerosol can be generated.
In addition, the cooling unit 20 is not directly heated by the heating unit 121, although heat from the substrate 10 heated by the heating unit 121 is propagated thereto, and air passing through the substrate 10 passes through the cooling unit 20. Therefore, the internal temperature of the cooling unit 20 tends to be lower at a location farther from the substrate 10 when the stick 1 is in use. The cooling unit 20 has a double structure of the first sheet 21 and the second sheet 22, so that the internal temperature can be controlled compared to a single structure of the first sheet 21 alone. Specifically, the decrease in the internal temperature of the cooling unit 20 can be suppressed. In addition, by maintaining the internal temperature of the cooling unit 20 at a temperature higher than 100° C., it is possible to prevent the steam and/or aerosol passing through the cooling unit 20 from being cooled too much.

The cross section of the cooling section 20 is substantially circular, and its outer diameter may be changed appropriately according to the size of the stick 1, but is preferably approximately the same as the outer diameter of the first filter 31. This "approximately the same" refers to, for example, the difference between the thickness of the first sheet 21 and the second sheet 22 and the thickness of the wrapping paper 12, the difference within 1 mm from the outer diameter of the flavor source 11, and the difference within 1 mm from the inner diameter of the wrapping paper 12. If the cross section is not circular, the above outer diameter is assumed to be a circle having the same area as the area of the cross section, and the outer diameter of that circle is applied.
The size of the cooling part 20 in the center line direction can be appropriately changed according to the size of the stick 1, but 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 section 20 in the center line direction to be equal to or larger than the above-mentioned lower limit, a sufficient cooling effect can be ensured to obtain a good flavor. Also, by setting the size of the cooling section 20 in the center line direction to be equal to or smaller than the above-mentioned upper limit, the length of the flow path through which the aerosol reaches the mouth can be minimized, and a decrease in the amount of aerosol released can be suppressed.

From the viewpoint of cooling the steam and/or aerosol while maintaining the internal temperature of the cooling unit 20 at a temperature higher than 100° C., it is preferable that the cooling unit 20 is a member having an appropriate heat retention property.
There are no particular limitations on the material of the first sheet 21 and the second sheet 22 as long as it is possible to realize an appropriate thermal conductivity. The material of the first sheet 21 and the second sheet 22 may be, for example, a material mainly composed of pulp, or a material mainly composed of any of polyethylene, polypropylene, polyvinyl chloride, polyethylene terephthalate, polylactic acid, cellulose acetate, aluminum, copper, and carbon fiber, or any combination of these.
Moreover, from the viewpoint of maintaining the internal temperature at a temperature higher than 100° C., it is preferable that the cooling unit 20 includes at least any one of aluminum-laminated paper, copper foil, and carbon paper. From the viewpoint of efficient heat retention, it is preferable that the second sheet 22 is any one of aluminum-laminated paper, copper foil, and carbon paper. Note that the “aluminum-laminated paper” is a sheet-like material in which aluminum foil and paper are laminated together.

As described above, the stick 1 is a non-combustion heating type flavor inhalation stick that is heated by the heating device 100 before use, and includes a base member 10 containing a flavor source 11, and a cooling member 20 that cools the vapor and/or aerosol generated when the base member 10 is heated during use. The cooling member 20 includes a first sheet 21 rolled into a cylindrical shape so that the cross section is hollow (hollow), and a second sheet 22 provided inside the first sheet 21.
Because the cooling section 20 is a cylindrical member having a double structure consisting of a first sheet 21 and a second sheet 22, when the stick 1 is in use, it is possible to cool the vapor and/or aerosol and maintain the internal temperature at a temperature higher than 100°C.

The above configuration is based on the discovery by the inventors, as a result of intensive research, that the temperature of the steam and aerosol affects the filtration rate within the stick 1 of the components generated by heating the base portion 10. In other words, the above configuration is based on the discovery by the inventors, as a result of intensive research, that by controlling the internal temperature of the cooling portion 20, it is possible to selectively filter the components generated by heating the base portion 10. Specifically, it is based on the discovery that by maintaining the internal temperature of the cooling portion 20 at a temperature higher than 100°C, it is possible to suppress the filtration of components that improve the flavor and aroma (e.g., nicotine).

Here, examples and comparative examples of the stick 1 according to the first embodiment will be described.
FIG. 3 is a diagram showing an example and a comparative example of the flavor inhalation stick 1 according to the first embodiment, where (A) shows a stick 1A according to the example, and (B) shows a stick 1B according to the first comparative example.
4A and 4B are diagrams showing other comparative examples of the flavor inhalation stick 1 according to the first embodiment, where (A) is a diagram showing a stick 1C according to a second comparative example, and (B) is a diagram showing a stick 1D according to a third comparative example.
The configuration of the stick 1A according to an example of the stick 1 in accordance with the first embodiment, and the configurations of the sticks 1B to 1D according to the first to third comparative examples will be described.
3 and 4, for the stick 1 according to the first embodiment, the portions corresponding to the substrate portion 10 are referred to as substrate portions 10A to 10D, the portions corresponding to the cooling portion 20 are referred to as cooling portions 20A to 20D, the portions corresponding to the filter portion 30 are referred to as filter portions 30A to 30D, the members corresponding to the tipping paper 40 are referred to as tipping papers 40A to 40D, and the openings corresponding to the communicating passages 60 are referred to as communicating passages 60A to 60D.

<<Example>>
As shown in FIG. 3A, the stick 1A according to the embodiment has the same configuration as the stick 1 (see FIG. 1). The size of the stick 1A in the center line direction is 60 mm. The size of the substrate 10A, the cooling section 20A, and the filter section 30A in the center line direction is 20 mm, respectively. The size of the tip paper 40A in the center line direction is 45 mm. The tip paper 40A is wound around the outer circumferential surface of the substrate 10A, the cooling section 20A, and the filter section 30A from a position 5 mm in the direction of the first side (upstream side) from the boundary between the substrate 10A and the cooling section 20A to the end of the second side (downstream side) of the filter section 30A. The position of the communication passage 60A in the center line direction is the second side (downstream side) from the center in the cooling section 20A. The communication passage 60A is formed at a location 5 mm in the direction of the first side (upstream side) from the boundary between the cooling section 20A and the filter section 30A.
In the substrate 10A, the outer periphery of a tobacco-derived flavor source 11A is covered with a cigarette paper 12A. By heating the substrate 10A, not only components that improve the flavor and aroma of the smoke, such as nicotine, but also components that have a slight but undesirable effect on the flavor and aroma of the smoke are produced. Examples of components that have an undesirable effect on the flavor and aroma of the smoke include tobacco-specific nitrosamines (TSNAs) that are produced when nicotine, an alkaloid in tobacco leaves, reacts with nitrous acid or nitric acid. Representative examples of TSNAs include N'-nitrosonornicotine (NNN), 4-(N-nitrosomethylamino)-1-(3-pyridyl)-1-butanone (NNK), and the like.
The cooling section 20A is a cylindrical member having a double structure of a first sheet 21A made of paper and a second sheet 22A made of aluminum-laminated paper. The inner wall of the cooling section 20A is the paper surface of the second sheet 22A.
The filter unit 30A is a dual filter composed of a first filter 31A, which is a center hole filter, and a solid second filter 32A, which are connected by a wrapping paper 33A. The sizes of the first filter 31A and the second filter 32A in the center line direction are 8 mm and 12 mm, respectively.

<<First Comparative Example>>
The stick 1B according to the first comparative example is a flavor inhalation stick similar to the stick 1A according to the embodiment, except that the cooling part 20B does not have a double structure, as shown in Fig. 3(B). The cooling part 20B of the stick 1B is a cylindrical member of a single structure wrapped with a paper sheet 21B so that the cross section is hollow (hollow). The material of the inner wall of the cooling part 20B is paper.

<<Second Comparative Example>>
The stick 1C according to the second comparative example is a flavor inhalation stick similar to the stick 1A according to the example, except that the position of the communication passage 60C in the center line direction is on the first side (upstream side) from the center of the cooling part 20C, as shown in Fig. 4(A). In the stick 1C, the communication passage 60C is not formed at a location 5 mm toward the first side from the boundary between the cooling part 20C and the filter part 30C.

<<Third Comparative Example>>
The stick 1D according to the third comparative example is a flavor inhalation stick similar to the stick 1A according to the embodiment, except that the first filter 31D is a solid filter and the second filter 32D is a center hole filter, as shown in Fig. 4(B) . In the filter section 30D of the stick 1D, the first filter 31D having a solid cross section is connected to the second side of the cooling section 20D, and the second filter 32D having a hollow cross section is located on the second side of the first filter 31D.

5 is a diagram showing a comparison result of the internal temperature when the configuration of the cooling section 20 is changed. Specifically, FIG. 5 shows the result of measuring the internal temperature of the cooling section 20A according to the embodiment and the internal temperature of the cooling section 20B according to the first comparative example. The horizontal axis of FIG. 5 indicates the distance from the substrate parts 10A, 10B, "0" is the boundary between the substrate parts 10A, 10B and the cooling sections 20A, 20B, and "20" is the boundary between the cooling sections 20A, 20B and the filter parts 30A, 30B. The vertical axis of FIG. 5 indicates the internal temperature of the cooling sections 20A, 20B for each distance from the substrate parts 10A, 10B.
Thermocouples were attached to the cooling parts 20A and 20B so that the temperature of a predetermined location could be measured when the sticks 1A and 1B were used. For example, a thermocouple was attached to the inner wall of the cooling parts 20A and 20B. The sticks 1A and 1B with the thermocouple attached to the cooling parts 20A and 20B were inserted into the heating device 100, and the substrate parts 10A and 10B were heated. Specifically, the heating device 100 heated the substrate parts 10A and 10B under heating conditions in which the temperature of the heating part 121 was raised from a non-heated state to 290°C in 30 seconds and then kept constant for 5 minutes. After this, the sticks 1A and 1B were inhaled, and the maximum temperature of each measurement location during inhalation was taken as the internal temperature of the cooling parts 20A and 20B. For example, the sticks 1A and 1B were inhaled at a flow rate of 55cc/2 seconds using a Borgwald single-stick automatic smoking machine. The measurements were performed with the communication passages 60A and 60B open.

Stick 1A and stick 1B differ in that cooling section 20A is composed of a first sheet 21A of paper and a second sheet 22A of aluminum-laminated paper, while cooling section 20B is composed of a paper sheet 21B, but are identical in that cooling sections 20A and 20B are hollow.
Since the substrate parts 10A and 10B heated by the heating device 100 are located on the first side (upstream side) relative to the cooling parts 20A and 20B, the internal temperatures of the cooling parts 20A and 20B decrease the further away from the substrate part 10. In other words, the internal temperatures of the cooling parts 20A and 20B decrease from the first side (upstream side) to the second side (downstream side). In the stick 1B, the cooling part 20B is composed only of a paper sheet 21B, so the internal temperature of the cooling part 20B decreases to 100° C. or less. In contrast, the stick 1A has a second sheet 22A of aluminum-laminated paper, so that the second sheet 22A keeps the temperature constant, and thus the internal temperature decrease is suppressed more than in the stick 1B. Specifically, since the cooling section 20A is composed of a first sheet 21A of paper and a second sheet 22A of aluminum-laminated paper, the internal temperature on the second side (downstream side) of the cooling section 20A is maintained at a temperature higher than the exponential approximation curve of the stick 1B.

Moreover, in the stick 1C according to the second comparative example, it is difficult to maintain the internal temperature of the cooling part 20C at a temperature higher than 100°C.
Stick 1A and stick 1C differ in that communicating passage 60A is formed on the second side (downstream side) within cooling section 20A, while communicating passage 60C is formed on the first side (upstream side) within cooling section 20C, but are identical in that cooling sections 20A, 20C have a double structure including aluminum laminated paper.
For stick 1C, the internal temperature of cooling section 20C at each distance from substrate 10C is not shown, but the internal temperature is lower than that of stick 1A. Since communication passage 60C is formed on the first side (upstream side) of cooling section 20C, air from the outside flows into cooling section 20C on the first side (upstream side), and cooling of the internal air is promoted more than in cooling section 20A. As a result, it is difficult to maintain the internal temperature at a temperature higher than 100°C even on the second side (downstream side) of cooling section 20C.

Here, the relationship between the filtration rate of the components generated by heating the substrate portion 10 and the internal temperature of the cooling portion 20 will be described.
After inserting the stick 1 into the heating device 100 and carrying out a smoking test, the amount of adsorption and the amount of release of various components generated by heating the substrate 10 are measured, and the filtration rate of each component is calculated from the measurement results. Specifically, the amount of adsorption and the amount of release of nicotine, NNN, and NNK are measured as components generated by heating the substrate 10, and the filtration rate of each component is calculated. The conditions of the smoking test when examining the relationship between the internal temperature of the cooling unit 20 and the filtration rate of each component are as follows. The heating device 100 raises the temperature of the heating unit 121 from a non-heated state to a target temperature in 30 seconds, and then keeps it constant at the target temperature for 5 minutes. After this, automatic smoking is performed using a Borgwald single-stick automatic smoking machine under the conditions of a flow rate of 55 cc/2 seconds and a smoking interval of 30 seconds. The smoking test is carried out with the communication passage 60 open. The aerosol that has passed through the filter unit 30 is collected in a Cambridge pad, and the Cambridge pad is removed after eight puffing operations.

The amount of nicotine adsorbed and released is measured by the following method. The measurement subject is subjected to a fractional extraction method using hexane, ethyl acetate, ethanol and methanol to extract the adsorbed nicotine. The amount of nicotine contained in the extract is then measured using gas chromatography. This measured value is the amount of nicotine adsorbed or released.
The adsorption and release amounts of NNN and NNK are measured by the following method. The object to be measured is added to a 0.1 M (mol/L) aqueous solution of ammonium acetate, and stirring extraction (180 rpm, 60 min) is performed. The extract is then filtered through a glass fiber filter, and the amounts of NNN and NNK contained in the obtained filtrate are measured using ion chromatography. These measured values are the adsorption or release amounts of NNN and the adsorption or release amounts of NNK. An aqueous acetic acid solution and an acetic acid-methanol solution can be used as the mobile phase.

The amount of adsorption of each component is measured by dividing it into the amount P1 adsorbed in a 5 mm-wide area in the center line direction where the average value of the internal temperature of the cooling section 20 corresponds to each temperature, and the amount M adsorbed in the remaining area of the cooling section 20 and the filter section 30. The amount M adsorbed in the remaining area of the cooling section 20 and the filter section 30 may be measured by dividing it into the amount P2 adsorbed in the remaining area of the cooling section 20 and the amount F adsorbed in the filter section 30. The amount F adsorbed in the filter section 30 may be measured by dividing it into the amount F1 adsorbed in the first filter 31 and the amount F2 adsorbed in the second filter 32. The amount of release of each component is the amount of each component released from the stick 1 through the filter section 30, and the amount V of each component adhering to the Cambridge pad after the smoking test is measured. The filtration rate according to the internal temperature is calculated by the formula (1).

(Equation 1)
Filtration rate by internal temperature (%) = P1/(P1+M+V) x 100
=P1/(P1+P2+F+V)×100
=P1/(P1+P2+F1+F2+V)×
100

FIG. 6 is a graph showing the relationship between the internal temperature and the filtration rate of various components, where (A) shows the filtration rate of nicotine, (B) shows the filtration rate of NNN, and (C) shows the filtration rate of NNK.
6 shows the filtration rates of nicotine, NNN, and NNK for each internal temperature of the cooling unit 20B according to the first comparative example. In FIG. 6, the horizontal axis shows the internal temperature of the cooling unit 20B, and the vertical axis shows the filtration rates of various components.
In addition, the inner wall surface of the cooling section 20B according to the first comparative example is made of the same paper as the inner wall surface of the cooling section 20A according to the embodiment. The conditions to which the steam and aerosol passing through the cooling section 20B are exposed differ only in temperature from the conditions to which the steam and aerosol passing through the cooling section 20A are exposed. Therefore, the relationship between the internal temperature of the cooling section 20B and the filtration rate of various components shown in FIG. 6 is similar to the relationship between the internal temperature of the cooling section 20A according to the embodiment and the filtration rate of various components.

The nicotine filtration rate shown in FIG. 6(A) was calculated based on the amount of nicotine adsorbed and released measured according to the following method. After the smoking test, a 5 mm-wide area in the center line direction where the average value of the internal temperature corresponds to each temperature was cut out from the cooling section 20B. The cut-out area was subjected to the same fraction extraction method as above, and the amount of nicotine contained in the extract was measured using gas chromatography. The remaining area of the cooling section 20B, the first filter 31B, the second filter 32B, and the Cambridge pad after the smoking test were each subjected to the same fraction extraction method as above, and the amount of nicotine contained in each extract was measured using gas chromatography. The measured amount of nicotine adsorbed and released was then substituted into formula (1) to calculate the nicotine filtration rate for each temperature where the average value of the internal temperature of the cut-out area corresponds.

From the results shown in FIG. 6(A), when the internal temperature of the cooling section 20B is about 100°C or less, the nicotine filtration rate tends to increase as the temperature increases. However, when the internal temperature of the cooling section 20B is higher than about 100°C, the nicotine filtration rate decreases as the temperature increases. Specifically, when the internal temperature of the cooling section 20B is higher than about 100°C, the proportion of nicotine generated by heating the substrate 10B that is adsorbed in the cooling section 20 is suppressed. In other words, from the viewpoint of improving the delivery efficiency of nicotine generated by heating the substrate 10B, it is preferable to maintain the internal temperature of the cooling section 20B at a temperature higher than 100°C. Note that when the internal temperature of the cooling section 20B is higher than about 150°C, the decrease in the nicotine filtration rate is more gradual than when the internal temperature of the cooling section 20B is 100°C or higher and about 150°C or lower.

The filtration rate of NNN shown in FIG. 6(B) and the filtration rate of NNK shown in FIG. 6(C) were calculated based on the adsorption amount and release amount measured according to the following method. After the smoking test, a region 5 mm wide in the center line direction where the average value of the internal temperature corresponds to each temperature was cut out from the cooling part 20B. The cut-out region was stirred and extracted in the same manner as above, and the amount of NNN and NNK contained in each extract was measured using ion chromatography. In addition, the remaining region of the cooling part 20B, the first filter 31B, the second filter 32B, and the Cambridge pad after the smoking test were each stirred and extracted in the same manner as above, and the amount of NNN and NNK contained in the extract was measured using ion chromatography. The measured adsorption amount and release amount of NNN and NNK were then substituted into formula (1), and the filtration rate of NNN and the filtration rate of NNK were calculated for each temperature where the average value of the internal temperature of the cut-out region corresponds.

From the results shown in Figures 6 (B) and 6 (C), when the internal temperature of cooling section 20B was about 100°C, the filtration rate of NNN and the filtration rate of NNK exceeded 10%. Furthermore, when the internal temperature of cooling section 20B was about 150°C or less, the filtration rate of NNN and the filtration rate of NNK tended to increase as the temperature increased. The filtration rate of NNN and the filtration rate of NNK were maximum when the internal temperature of cooling section 20B was about 150°C. In other words, from the viewpoint of suppressing the filtration of nicotine while promoting the filtration of TSNA, it is preferable that the internal temperature of cooling section 20B is higher than 100°C. However, when the internal temperature of cooling section 20B was too high, the filtration rate of NNN and the filtration rate of NNK tended to decrease. Specifically, the filtration rate of NNN was less than 10% when the internal temperature of cooling section 20B was about 200°C, but was less than 5% when the internal temperature of cooling section 20B was about 250°C. In addition, the filtration rate of NNK was less than 15% when the internal temperature of cooling section 20B was about 200°C, but was less than 5% when the internal temperature of cooling section 20B was about 250°C. Therefore, it is more preferable that the internal temperature of cooling section 20B is higher than 100°C and not higher than 200°C at the coldest point in cooling section 20B. The coldest point in cooling section 20B is, for example, the point in cooling section 20B that is furthest from substrate section 10B.

Next, the relationship between the structure of the stick 1 and the delivery of various ingredients will be described.
The conditions of the smoking test when the influence of the configuration of the stick 1 on the delivery of various components was examined are as follows. The heating device 100 raises the temperature of the heating part 121 from a non-heated state to 290°C in 30 seconds, and then keeps it constant at 290°C for 5 minutes, similar to the heating conditions in Fig. 5. After this, automatic smoking is performed using a Borgwald single-puff automatic smoking machine under the conditions of a flow rate of 55cc/2 seconds and a smoking interval of 30 seconds. The smoking test is performed with the communication passage 60 open. The aerosol that has passed through the filter part 30 is collected in a Cambridge pad, and after eight puffing operations, the Cambridge pad is removed.

The methods for measuring the adsorption and release amounts of nicotine, and the adsorption and release amounts of NNN and NNK are the same as those described above. The adsorption amounts of various components are measured separately as the amount P adsorbed in the cooling section 20 and the amount F adsorbed in the filter section 30. The amount F adsorbed in the filter section 30 is the sum of the amount F1 adsorbed in the first filter 31 and the amount F2 adsorbed in the second filter 32. The filtration rate by the cooling section 20 is calculated using formula (2).

(Equation 2)
Filtration rate by cooling section (%) = P/(P+F+V) x 100
=P/(P+F1+F2+V)×100

FIG. 7 is a diagram showing the comparative results of nicotine delivery when the configuration of the cooling section 20 is changed, where (A) shows the nicotine filtration rate and (B) shows the amount of nicotine released.
Fig. 7(A) shows the nicotine filtration rate by the cooling part 20A of the stick 1A according to the embodiment (hereinafter referred to as "by the cooling part 20A") and the nicotine filtration rate by the cooling part 20B of the stick 1B according to the first comparative example (hereinafter referred to as "by the cooling part 20B"). Fig. 7(B) shows the amount of nicotine released by the stick 1A according to the embodiment and the amount of nicotine released by the stick 1B according to the first comparative example.

The nicotine filtration rate by the cooling units 20A and 20B shown in FIG. 7(A) was calculated by subjecting each measurement subject to the same fraction extraction method as described above after the smoking test, and substituting the amount of nicotine contained in the extract measured using gas chromatography into formula (2).
As shown in Fig. 5, the stick 1A and the stick 1B are different in that the internal temperature of the cooling part 20A is maintained at a temperature higher than 100°C, whereas the internal temperature of the cooling part 20B is 100°C or lower, but both have the same inner wall surface made of paper. When the internal temperature of the cooling part 20A is higher than about 100°C, nicotine filtration is suppressed, so the nicotine filtration rate by the cooling part 20A, whose internal temperature is maintained at a temperature higher than 100°C, is slightly lower than the nicotine filtration rate by the cooling part 20B, whose internal temperature is 100°C or lower.

The amount of nicotine released by the sticks 1A and 1B shown in FIG. 7(B) is the amount adhering to the Cambridge pad after the smoking test.
As shown in Fig. 7(A) , the nicotine filtration rate of the cooling parts 20A and 20B of the stick 1A and the stick 1B is different. Since the nicotine filtration rate of the cooling part 20A is slightly lower than the nicotine filtration rate of the cooling part 20B, the amount of nicotine released by the stick 1A is slightly greater than the amount of nicotine released by the stick 1B.

FIG. 8 is a diagram showing the comparison results of the filtration rate of TSNA when the configuration of the cooling unit 20 is changed, where (A) shows the filtration rate of NNN and (B) shows the filtration rate of NNK.
Fig. 8(A) shows the filtration rate of NNN by the cooling part 20A of the stick 1A according to the embodiment and the filtration rate of NNN by the cooling part 20B of the stick 1B according to the first comparative example. Fig. 8(B) shows the filtration rate of NNK by the cooling part 20A according to the embodiment and the filtration rate of NNK by the cooling part 20B according to the first comparative example.

The NNN filtration rate by the cooling units 20A and 20B shown in Fig. 8(A) was calculated by extracting each measurement subject by stirring in the same manner as above after the smoking test, measuring the amount of NNN contained in each extraction liquid using ion chromatography, and substituting the measured value into formula (2). The NNK filtration rate by the cooling units 20A and 20B shown in Fig. 8(B) was calculated in the same manner as the NNN filtration rate by the cooling units 20A and 20B.
As shown in FIG. 5, the stick 1A and the stick 1B are different in that the internal temperature of the cooling part 20A at a location 14 mm away from the base material part 10A is maintained at about 150° C., while the internal temperature of the cooling part 20B is 150° C. or less on the first side (upstream side) of the cooling part 20B. When the internal temperature of the cooling part 20 is around 150° C., filtration of NNN and filtration of NNK are promoted, so the cooling part 20A, whose internal temperature is maintained at a temperature higher than 150° C. over a wide range, has a higher filtration rate of NNN and filtration rate of NNK than the cooling part 20B. The stick 1A having the cooling part 20A promotes filtration of NNN and NNK while suppressing filtration of nicotine. In other words, the cooling part 20A of the stick 1A selectively filters various components generated by heating the base material part 10A.

FIG. 9 shows the comparative results of the amount of TSNA released when the configuration of the flavor inhalation stick 1 is changed, where (A) shows the amount of NNN released and (B) shows the amount of NNK released.
Fig. 9(A) shows the amount of NNN emitted from stick 1A according to the embodiment, the amount of NNN emitted from stick 1B according to the first comparative example, and the amount of NNN emitted from stick 1D according to the third comparative example. Fig. 9(B) shows the amount of NNK emitted from stick 1A according to the embodiment, the amount of NNK emitted from stick 1B according to the first comparative example, and the amount of NNK emitted from stick 1D according to the third comparative example. The amounts of NNN emitted and NNK emitted from sticks 1A, 1B, and 1D are the amounts adhering to the Cambridge pad after the smoking test.

As shown in Figures 8(A) and (B), the filtration rates of NNN and NNK differ between cooling units 20A and 20B for stick 1A and stick 1B. Because the filtration rate of NNN and NNK by cooling unit 20A is higher than the filtration rate of NNN and NNK by cooling unit 20B, the amount of NNN and NNK emitted by stick 1A is less than the amount of NNN and NNK emitted by stick 1B, as shown in Figures 9(A) and (B). The amount of TSNA emitted by stick 1A is reduced by about 25 to 30% compared to stick 1B.

The difference between the stick 1A and the stick 1D is that the first filter 31A located on the first side (upstream side) of the filter unit 30A has a hollow portion, whereas the first filter 31D located on the first side (upstream side) of the filter unit 30D is solid. On the other hand, the stick 1A and the stick 1D are the same in that the filter units 30A, 30D are composed of a hollow filter and a solid filter. Also, the stick 1A and the stick 1D are the same in that the cooling units 20A, 20D are cylindrical members with a double structure of paper and aluminum-laminated paper.
In the stick 1D, the first filter 31D, which has a solid cross section, is adjacent to the second side (downstream side) of the cooling section 20D. In contrast, in the stick 1A, the first filter 31A adjacent to the cooling section 20A has a hollow cross section, so that the cooling section 20A dissipates heat more easily than the cooling section 20D. Therefore, the internal temperature of the cooling section 20D becomes higher than the internal temperature of the cooling section 20A, and the filtration rate of TSNA (e.g., NNN, NNK) by the cooling section 20D may become lower than the filtration rate of TSNA by the cooling section 20A.

As shown in Figures 9(A) and (B), the amount of NNN and NNK emitted by stick 1A, in which the aerosol passes through hollow first filter 31A and then solid second filter 32A, is less than the amount of NNN and NNK emitted by stick 1D, in which the aerosol passes directly through solid first filter 31D. Thus, although stick 1D has the same configuration of cooling section 20D as cooling section 20A, the filtration rate of TSNA (e.g., NNN, NNK) is lower, and the amount of TSNA emitted is greater than that of stick 1A.

As explained above, the stick 1 is a non-combustion heating type flavor inhalation stick that is heated by the heating device 100 before use, and includes a base portion 10 containing a flavor source 11, and a cooling portion 20 that cools the vapor and/or aerosol generated by heating the base portion 10 during use and maintains the internal temperature at a temperature higher than 100°C.

The stick 1 is inserted into the holding part 140 of the heating device 100. After the temperature of the base material part 10 heated by the heating part 121 reaches a predetermined temperature, the user inhales and generates an aerosol. When the user inhales, the vapor and aerosol are cooled in the cooling part 20. The cooling in the cooling part 20 means cooling the vapor to a degree that liquefies the vapor and generates an aerosol, and cooling the aerosol so that the aerosol delivered to the mouth has an appropriate temperature. In addition, when the internal temperature of the cooling part 20 is maintained at a temperature higher than 100° C., the filtration of nicotine, which is a component that improves the flavor and aroma, is suppressed.
According to the stick 1, it is possible to selectively suppress filtration of components that are generated by heating. In other words, according to the stick 1, it is possible to selectively filter out components that are generated by heating.

The cooling unit 20 preferably maintains the internal temperature during use at a temperature higher than 100° C. and lower than 200° C. at the coldest point within the cooling unit 20 .
The filtration rate of NNN and the filtration rate of NNK were maximum when the internal temperature of the cooling section 20 was about 150° C. By making the inside of the cooling section 20 higher than 100° C. and lower than 200° C., it is possible to promote the filtration of TSNA while suppressing the filtration of nicotine.

The cooling section 20 preferably maintains the internal temperature during use at a temperature higher than 100° C. and lower than 200° C. at the location within the cooling section 20 that is furthest from the substrate section 10 .
Since the cooling section 20 is not directly heated by the heating section 121 of the heating device 100, its internal temperature tends to be lower the farther it is from the substrate section 10 when the stick 1 is in use. Even at the location in the cooling section 20 farthest from the substrate section 10, the internal temperature is maintained higher than 100° C. and lower than 200° C., thereby promoting the filtration of TSNA while suppressing the filtration of nicotine.

When the cooling unit 20 is configured with a cylindrical member formed in a cylindrical shape, the internal temperature may be the temperature of the inner wall of the cylindrical member.
Of the steam and aerosol passing through the cooling section 20, the steam and aerosol passing through a region closer to the outer circumferential surface in the cross section of the cooling section 20 tend to dissipate heat more and have a lower temperature. The lowest temperature of the steam and aerosol passing through the cooling section 20 is approximately the same as the temperature of the inner wall of the cylindrical member. Therefore, by maintaining the temperature of the inner wall of the cylindrical member at a temperature higher than 100°C, the steam and aerosol passing through the cooling section 20 can be maintained at a temperature higher than 100°C.

The cooling section 20 preferably includes at least one of aluminum laminated paper, copper foil, and carbon paper.
By constructing the cooling section 20 from the above-mentioned materials, it becomes easy to maintain the internal temperature at a temperature higher than 100°C while cooling the steam and/or aerosol passing through the cooling section 20.

It is preferable that a communication passage 60 that connects the outside and the inside is formed downstream of the center of the cooling section 20 in the longitudinal direction of the region in which the cooling section 20 is disposed.
If the cooling unit 20 does not have a communication passage 60, air does not flow from the outside into the cooling unit 20 during suction, and there is a risk that the steam or aerosol flowing in from the base member 10 will not be sufficiently cooled. In the present embodiment, the communication passage 60 for the flow of outside air is provided, and therefore the cooling of the steam or aerosol can be promoted.
If the communication passage 60 is located upstream of the center in the longitudinal direction of the cooling section 20, cooling is promoted on the first side (upstream side) in the cooling section 20, and it is difficult to maintain the internal temperature on the second side (downstream side) at a temperature higher than 100° C. In the present embodiment, since the communication passage 60 is located downstream of the center in the longitudinal direction of the cooling section 20, the internal temperature can be maintained at a temperature higher than 100° C.

It is preferable to provide a filter section 30 having a first filter 31 having a hollow portion and adjacent to the downstream side of the cooling section 20 , and a solid second filter 32 adjacent to the downstream side of the first filter 31 .
Compared to when the filter section 30 is entirely a hollow filter, the temperature of the aerosol inhaled by the user can be lowered. Also, compared to when the filter section 30 is entirely a solid filter, the amount of components (e.g., nicotine) generated by heating can be maintained. Also, compared to when a solid filter is adjacent to the downstream side of the cooling section 20 and a filter having a hollow portion is adjacent to the downstream side of the solid filter, the amount of TSNA (e.g., NNN, NNK) released can be reduced.

Note that the stick 1 is not limited to a configuration including tipping paper 40 wrapped around the entire outer periphery of the cooling section 20. For example, the stick 1 may include two pieces of tipping paper 40 wrapped separately around the outer periphery of the boundary between the base section 10 and the cooling section 20, and the outer periphery of the boundary between the cooling section 20 and the filter section 30.

Second Embodiment
FIG. 10 is a diagram showing a vertical cross section of the flavor inhalation stick 2 according to the second embodiment.
The stick 2 according to the second embodiment is different from the stick 1 according to the first embodiment in that it has a cooling unit 220 that corresponds to the cooling unit 20. The differences from the first embodiment will be described below. The same reference numerals are used for the same parts in the first and second embodiments, and detailed descriptions thereof will be omitted.

The cooling section 220 differs from the cooling section 20 according to the first embodiment (see FIG. 1) in that the second sheet 222 is provided only on a part of the inside of the first sheet 221. The cooling section 220 has the first sheet 221 rolled into a cylindrical shape so that the cross section is hollow (hollow), and the second sheet 222 provided on the inside of the first sheet 221. The second sheet 222 is provided on the inside of the first sheet 221, on the second side (downstream side) within the cooling section 220. It can be exemplified that the materials constituting the first sheet 221 and the second sheet 222 are the same as the materials constituting the first sheet 21 and the second sheet 22 according to the first embodiment, respectively.

The internal temperature of the cooling section 220 tends to be lower the further away from the base section 10 when the stick 2 is in use. In other words, the internal temperature of the cooling section 220 tends to be lower on the second side (downstream side) when the stick 2 is in use. In the case of this embodiment, the second side (downstream side) of the cooling section 220 has a double structure, which makes it possible to suppress a decrease in the internal temperature of the cooling section 220. By suppressing a decrease in the internal temperature of the cooling section 220, it is possible to cool the steam and/or aerosol generated by heating the base section 10 when the stick 2 is in use, and to maintain the internal temperature at a temperature higher than 100°C.

As described above, the stick 2 is a non-combustion heating type flavor inhalation stick that is heated by the heating device 100 before use, and includes a base portion 10 containing a flavor source 11, and a cooling portion 220 that cools the vapor and/or aerosol generated by heating the base portion 10 during use and maintains the internal temperature at a temperature higher than 100°C.
Like stick 1, stick 2 allows selective filtering of components that are generated by heating.

Third Embodiment
FIG. 11 is a view showing a vertical cross section of a flavor inhalation stick 3 according to the third embodiment.
The stick 3 according to the third embodiment is different from the stick 1 according to the first embodiment in that it has a cooling unit 320 that corresponds to the cooling unit 20. The differences from the first embodiment will be described below. The same reference numerals are used for the same parts in the first and third embodiments, and detailed descriptions thereof will be omitted.

The cooling unit 320 differs from the cooling unit 20 according to the first embodiment (see FIG. 1) in that it has a single-layer structure. The cooling unit 320 has a sheet 321 rolled into a cylindrical shape so that the cross section is hollow (hollow).
The cooling section 320 is a section that cools the vapor and/or aerosol generated by heating the base section 10 and maintains the internal temperature at a temperature higher than 100° C. when the stick 3 is in use. In other words, the cooling section 320 is a section that cools the vapor and/or aerosol generated by heating the base section 10 while maintaining the internal temperature at a temperature higher than 100° C. when the stick 3 is in use.

The material of the sheet 321 is not particularly limited as long as it is capable of maintaining the internal temperature at a temperature higher than 100° C. Furthermore, when the material of the sheet 321 is the same as the material of the first sheet 21 and the second sheet 22 according to the first embodiment, the internal temperature may be maintained at a temperature higher than 100° C. by adjusting the thickness of the sheet 321.
The cooling section 320 is not limited to being formed by rolling the sheet 321, but may be formed of, for example, a tube.

As described above, the stick 3 is a non-combustion heating type flavor inhalation stick that is heated by the heating device 100 before use, and includes a base portion 10 containing a flavor source 11, and a cooling portion 320 that cools the vapor and/or aerosol generated by heating the base portion 10 during use and maintains the internal temperature at a temperature higher than 100°C.
Like stick 1, stick 3 allows selective filtering of components that are generated by heating.

<Modification>
(1) Although the embodiments of the present disclosure have been described above, the technical scope of the present disclosure is not limited to the scope described in the above-mentioned embodiments. It is clear from the claims that various modifications or improvements to the above-mentioned embodiments are also included in the technical scope of the present disclosure.

(2) At least the downstream outer periphery of the flavor source contained in the base material may be covered with at least one of aluminum-laminated paper, copper foil, and carbon paper. By covering at least the downstream region of the base material with a heat-retaining material, the temperature of the steam and/or aerosol when it flows into the cooling section may become higher. By increasing the temperature of the steam and/or aerosol when it flows into the cooling section, it becomes easier to maintain the internal temperature of the cooling section at a temperature higher than 100°C.

(3) The cooling section does not have to be made of a cylindrical member. Here, it is assumed that the flavor inhalation stick includes a substrate, a cooling section, a filter section through which the aerosol passes, and an exterior member that covers the outer circumferential surfaces of the substrate and the filter. In this case, the cooling section may be a space surrounded by the downstream surface of the substrate, the upstream surface of the filter, and the exterior member. There are no particular limitations on the exterior member as long as it is a member that can cool the vapor and/or aerosol generated by heating the substrate in the cooling section and maintain the internal temperature at a temperature higher than 100°C. For example, the exterior member is made of at least aluminum-laminated paper, copper foil, or carbon paper. When the cooling section is made of a cylindrical member, the volume is smaller than the space formed between the substrate and the filter by the exterior member. It is possible to maximize the cross-sectional diameter of the cooling section through which the vapor and aerosol pass, and to suppress the reduction in the amount of components (e.g., nicotine) generated by heating due to the cooling section.

(4) The flavor inhalation stick is a non-combustion heating type flavor inhalation stick that is inserted into a heating device for use, and may include a base portion having a flavor source and a heating member for heating the flavor source, and a cooling portion that cools the vapor and/or aerosol generated by heating the base portion during use and maintains the internal temperature at a temperature higher than 100°C. When the heating device generates a fluctuating electromagnetic field, eddy currents are generated in the heating member located within the fluctuating electromagnetic field, and as a result, the heating member is heated. The heated heating member heats the flavor source. By maintaining the internal temperature of the portion that cools the vapor and/or aerosol generated by heating the base portion at a temperature higher than 100°C, it is possible to selectively filter out components that are generated by heating the base portion from the inside.

<Summary>
The present disclosure includes the following configurations.
(1) A non-combustion heating type flavor inhalation stick that is heated by a heating device when used, the flavor inhalation stick comprising: a base portion containing a flavor source; and a cooling portion that, during use, cools the vapor and/or aerosol generated when the base portion is heated and maintains the internal temperature at a temperature higher than 100°C.
(2) The flavor inhalation stick according to (1), wherein the cooling section maintains the internal temperature during use at a temperature higher than 100°C and lower than 200°C at the coldest point within the cooling section.
(3) The flavor inhalation stick according to (1), wherein the cooling section maintains the internal temperature during use at a temperature higher than 100°C and lower than 200°C at a point in the cooling section that is furthest from the base section.
(4) A flavor inhalation stick described in any one of (1) to (3), wherein the internal temperature is the temperature of the inner wall of the cylindrical member when the cooling section is constituted by a cylindrical member.
(5) A flavor inhalation stick according to any one of (1) to (4), wherein the cooling portion includes at least one of aluminum-laminated paper, copper foil, and carbon paper.
(6) A flavor inhalation stick as described in any one of (1) to (5), in which a communication passage connecting the outside and the inside is formed downstream of the center of the cooling section in the longitudinal direction of the region in which the cooling section is arranged.
(7) A flavor inhalation stick as described in any one of (1) to (6), comprising a filter section including a first filter having a hollow portion and adjacent to the downstream side of the cooling section, and a solid second filter adjacent to the downstream side of the first filter.
(8) A flavor inhalation system comprising: a flavor inhalation stick according to any one of (1) to (7); and a heating device for heating the flavor inhalation stick.

1...Flavor inhalation stick, 10...Base material, 11...Flavor source, 12...Wrapping paper, 20...Cooling section, 21...First sheet, 22...Second sheet, 30...Filter section, 31...First filter, 32...Second filter, 40...Tipping paper, 60...Connecting passage, 100...Heating device

Claims (8)

A non-combustion heating type flavor inhalation stick that is heated by a heating device and used,
A base portion including a flavor source;
A cooling section that cools the vapor and/or aerosol generated by heating the substrate section during use and maintains an internal temperature at a temperature higher than 100°C;
A flavor inhalation stick comprising: The cooling unit maintains the internal temperature during use at a temperature higher than 100° C. and lower than 200° C. at the coldest point in the cooling unit.
The flavor inhalation stick according to claim 1. The cooling unit maintains the internal temperature during use at a temperature higher than 100° C. and lower than 200° C. at a location in the cooling unit farthest from the base material.
The flavor inhalation stick according to claim 1. When the cooling unit is configured with a cylindrical member formed in a cylindrical shape, the internal temperature is the temperature of the inner wall of the cylindrical member.
The flavor inhalation stick according to any one of claims 1 to 3. The cooling section includes at least one of aluminum laminated paper, copper foil, and carbon paper.
The flavor inhalation stick according to any one of claims 1 to 4. A communication passage that communicates between the outside and the inside is formed downstream of the center of the cooling section in the longitudinal direction of the cooling section in the region in which the cooling section is disposed.
The flavor inhalation stick according to any one of claims 1 to 5. a filter unit including a first filter having a hollow portion and adjacent to the downstream side of the cooling unit, and a solid second filter adjacent to the downstream side of the first filter,
The flavor inhalation stick according to any one of claims 1 to 6. A flavor inhalation stick according to any one of claims 1 to 7,
A heating device for heating the flavor inhalation stick;
A flavor suction system comprising: