Filter for aerosol-generating article, and aerosol-generating article comprising said filter

Abstract

Provided is a filter for an aerosol-generating article, the filter comprising an additive-containing segment, wherein the additive-containing segment includes a sheet material wrapped with a wrapper, the sheet material containing an additive, and the additive having phenol filtration capability and a melting point of 70 °C or less.

Description

A filter for aerosol products, and an aerosol product equipped with the filter.

[0001] The present invention relates to a filter for aerosol products and an aerosol product equipped with the filter.

[0002] Traditionally, acetate fibers have been widely used as filter media in smoking products such as filtered cigarettes. In recent years, from the perspective of reducing environmental impact, the use of biodegradable materials as filter media in various products has been promoted, and the use of biodegradable materials such as paper filters in smoking products is being considered. However, paper filters have lower filtration performance for phenols, which are listed in the HPHC list and whose reduction is desired, compared to filters using acetate fibers. Therefore, attempts are being made to impart the function of filtering phenols to paper filters.

[0003] For example, Patent Document 1 reports a technique for adding a phenol scavenger with a dropping point of 50°C or higher to a filter to impart selective filtration capability for phenol and improve storage stability.

[0004] International Publication No. 2021 / 001961

[0005] Patent Document 1 uses a semi-solid additive, and while its phenol reduction ability is suitable for practical use, there is room for improvement. Therefore, further improvement of the phenol reduction effect is required.

[0006] The object of the present invention is to provide a filter for aerosol products that can sufficiently filter phenol.

[0007] The present inventors conducted diligent studies to solve the above problems and found that phenol can be sufficiently filtered by using a filter comprising an additive-containing segment, the additive-containing segment comprising a sheet material wound around a wrapper, the sheet material containing an additive, the additive having phenol filtering ability and a melting point of 70°C or lower. Thus, the present invention was completed. In other words, the gist of the present invention is as follows.

[0008] [1] A filter for aerosol products, wherein the filter comprises an additive-containing segment, the additive-containing segment includes a sheet material wound by a wrapper, the sheet material contains an additive, the additive has phenol filtering ability, and the melting point is 70°C or lower. [2] The filter according to [1], wherein the additive-containing segment has pores, and the cumulative pore volume of all pores in the additive-containing segment is 1.5 mL / g or more. [3] The filter according to [1] or [2], wherein the sheet material includes pulp with a filtration rate of 700 mL or more. [4] The filter according to any one of [1] to [3], wherein the air permeability of the sheet material is 3000 cholesterol units or more. [5] The filter according to any one of [1] to [4], wherein the basis weight of the sheet material is 20 gsm or more and 60 gsm or less. [6] The filter according to any one of [1] to [5], wherein the additive-containing segment has another segment on the upstream side in the longitudinal direction. [7] The ventilation resistance of the other segment is 0 to 1.0 mmH ２ A filter according to [6], wherein the filter has a density of 0 / mm. [8] A filter according to any one of [1] to [7], wherein the additive-containing segment constitutes the segment on the intake end side of the aerosol product. [9] The airflow resistance of the additive-containing segment is 0.4 to 2.0 mmH ２ A filter according to [1] to [8], wherein the filter has a density of 0 / mm.

[10] A filter according to [6], wherein another segment located upstream of the additive-containing segment in the longitudinal direction comprises a sheet material wound with a wrapper, the sheet material comprising pulp having a filtration efficiency of 300 mL or less.

[11] A filter according to [6] or [7], wherein the air permeability of the sheet material contained in another segment located upstream of the additive-containing segment in the longitudinal direction is 0 cholesterol units.

[12] A filter according to any one of [1] to

[11] , wherein the additive-containing segment has a hollow paper tube on the upstream side in the longitudinal direction inside it.

[13] An aerosol product comprising a filter according to any one of [1] to

[12] and an aerosol-generating segment on the upstream side in the longitudinal direction thereof.

[0009] According to the present invention, a filter for aerosol products that can sufficiently filter phenol can be provided.

[0010] This is a schematic diagram showing a first example of the configuration of an aerosol product according to an embodiment of the present invention. This is a schematic diagram showing a second example of the configuration of an aerosol product according to an embodiment of the present invention. This is a schematic diagram showing a third example of the configuration of an aerosol product according to an embodiment of the present invention. This is a schematic diagram showing a fourth example of the configuration of an aerosol product according to an embodiment of the present invention. This is a schematic diagram of a non-combustion type aerosol generation system according to an embodiment of the present invention. This is a diagram showing a comparison of the phenol filtration capacity of filter samples prepared in the experimental example. This is a diagram showing a comparison of the phenol filtration capacity of another filter sample prepared in the experimental example. This is a diagram showing a comparison of the phenol filtration capacity of yet another filter sample prepared in the experimental example.

[0011] The embodiments of the present invention will be described in detail below, but these descriptions are examples (representative examples) of embodiments of the present invention, and the present invention is not limited to these contents unless it exceeds the gist of the invention. In this specification, numerical ranges expressed using "~" mean a range that includes the numbers written before and after "~" as the lower and upper limits, and "A~B" means A or more and B or less. In this specification, the expression "A or B" may be read as "at least one selected from the group consisting of A and B". In this specification, multiple embodiments will be described, and various conditions in each embodiment can be applied to each other to the extent that they are applicable. In addition, in some figures in the drawings, the X, Y, and Z directions are shown, but the left-right direction is the X direction, the up-down direction is the Y direction, and the depth direction is the Z direction, while the left-right direction is the X direction, the up-down direction is the Y direction, and the depth direction is the Z direction, while the right-left direction is the X direction, the up-down direction is the Y direction, and the depth direction is the Z direction, while the right-left direction is the Y direction, and the down-down direction is the Z direction, while the down-down direction is the Z direction, while the left-right direction is the Y direction, and the down-down direction is the Z direction, while the down-down direction is the Z direction, while the right-left direction is the Y direction, and the down-down direction is the Z direction, while the down-down direction is the Z direction, while the up-down direction is the Y direction. In addition, in some figures in the drawings the elements of the non-combustible aerosol generation system are not limited to being arranged in the directions shown in the drawings.

[0012] The aerosol product according to this embodiment will be described below with reference to the figures, but this embodiment is not limited to this form. In this specification, figures may be used to describe each embodiment, but the descriptions of each embodiment and the dimensions, materials, shapes, and relative positions of the components shown in the figures are examples only.

[0013] <Aerosol Product> An aerosol product according to one embodiment of the present invention (hereinafter also simply referred to as "aerosol product") is an aerosol product equipped with a specific filter described later. An example of the aerosol product is an aerosol product equipped with a specific mouthpiece segment and an aerosol generating segment described later. The aerosol product may also be equipped with an intermediate segment between the mouthpiece segment and the aerosol generating segment. Details of each segment will be described later. The mouthpiece segment includes a filter as a component. The manner of use of the aerosol product according to this embodiment is not particularly limited, and the aerosol product may be an electrically heated aerosol product, a non-combustible aerosol product, or a cigarette (paper-wrapped cigarette). An example of the aerosol product 100 according to this embodiment is a substantially cylindrical rod shape. In the example shown in Figures 1 to 4, the aerosol product 100 includes an aerosol generating segment 110, an intermediate segment 120, a mouthpiece segment 130, and a tip paper 140 that integrally connects these. The intermediate segment 120 and the mouthpiece segment 130 are connected coaxially with the aerosol generating segment 110 by being wound together with the aerosol generating segment 110 on tip paper 140. When the aerosol product 100 according to this embodiment is used as a cigarette, it may have an intermediate segment 120, but since cigarettes generally do not have an intermediate segment, it can be used in a form in which the aerosol generating segment 110 is extended to the region where the intermediate segment 120 would normally be located, without having an intermediate segment 120.

[0014] Reference numeral 101 denotes the mouthpiece end of the aerosol product 100 (mouthpiece segment 130). Reference numeral 102 denotes the tip of the aerosol product 100 opposite to the mouthpiece end 101. The aerosol generating segment 110 is located on the tip 102 side of the aerosol product 100. In the examples shown in Figures 1 to 4, the aerosol product 100 has a substantially constant diameter along its entire length in the longitudinal direction (hereinafter also referred to as the longitudinal axis direction or Z direction) from the mouthpiece end 101 to the tip 102.

[0015] The composition of the aerosol product 100 is not particularly limited and can be in a general form. In the embodiment shown in Figure 1, the aerosol generating segment 110, the intermediate segment 120, and the mouthpiece segment 130 are each shown as a single segment, but each part may be composed of one or more segments. For example, in the embodiments shown in Figures 2 and 3, the mouthpiece segment 130 is composed of a second segment 130b and a first segment 130a. Also, in the embodiment shown in Figure 3, the tip segment 113 is arranged adjacent to the aerosol generating segment. Although the mouthpiece segment in Figures 2 and 3 includes two segments, the embodiment is not limited to this, and the mouthpiece segment may include three or more segments, for example, three, four, or five segments. In these embodiments, it is preferable that the additive-containing segment, which will be described later, is arranged on the downstream side in the long axis direction of the aerosol product 100, i.e., on the mouthpiece end side. When the mouthpiece segment consists of two segments, it is preferable that the aerosol product 110 has the additive-containing segment as the first segment 130a and another segment as the second segment 130b on the upstream side in the longitudinal direction. In the embodiment shown in Figure 4, the segment constituting the mouthpiece segment 130 is the additive-containing segment described later, and a hollow paper tube 170 is provided inside it. The configurations shown in Figures 2 to 4 can be replaced as appropriate. For example, the mouthpiece segment 130 exemplified in Figure 4 can also be used as the mouthpiece segment 130 of the aerosol product 100 shown in Figures 2 and 3.

[0016] The ventilation resistance in the long-axis direction per piece of the aerosol-generating article 100 is not particularly limited, but from the viewpoint of ease of inhalation, it is usually 10 mmHg ２ or more, and preferably 20 mmHg ２ or more, more preferably 30 mmHg ２ or more. Also, it is usually 200 mmHg ２ or less, preferably 100 mmHg ２ or less, more preferably 60 mmHg ２ or less. The ventilation resistance is measured in accordance with the ISO standard method (ISO 6565:2015), for example, using a filter ventilation resistance measuring instrument manufactured by Cellier. The ventilation resistance refers to the pressure difference between the first end face and the second end face when air with a predetermined air flow rate (17.5 cc / sec) is passed from one end face (the first end face) to the other end face (the second end face) in a state where air permeation on the side surface of the aerosol-generating article 100 does not occur. The unit is generally represented by mmHg ２ . The relationship between the ventilation resistance and the aerosol-generating article 100 is known to be a proportional relationship in the usually implemented length range (length 5 mm to 200 mm). If the length of the aerosol-generating article 100 is doubled, its ventilation resistance will also double. The same applies to the ventilation resistance described below.

[0017] The cross-sectional shape of the aerosol-generating article 100 is not particularly limited and may be polygonal, rounded polygonal, circular, elliptical, or the like. In this specification, "cross-section" means a plane extending in the X-axis direction and the Y-axis direction plane of FIG. 1. The length in the long-axis direction of the aerosol-generating article 100 is not particularly limited. For example, it is usually 40 mm or more, preferably 45 mm or more, and more preferably 50 mm or more. Also, it is usually 100 mm or less, preferably 90 mm or less, and more preferably 80 mm or less. The width of the tip 102 of the aerosol-generating article 100 (diameter in the case where the cross-sectional shape is circular) is not particularly limited. For example, it is usually 5 mm or more, preferably 5.5 mm or more. Also, it is usually 10 mm or less, preferably 9 mm or less, and more preferably 8 mm or less.

[0018] <Aerosol Generation Segment> The aerosol generation segment 110 according to an embodiment of the present invention is not particularly limited as long as it contains a tobacco raw material. As an example, the aerosol generation segment may use a tobacco filler 111 (hereinafter, a filler including a sheet material and other materials filled in the aerosol generation segment 110 may be simply referred to as a "tobacco filler") composed of a sheet material containing a tobacco raw material or shredded tobacco, etc., which is wound by a wrapper 112.

[0019] The wrapper 112 for winding the aerosol generation segment is preferably coated on the inside. There is no particular limitation on the coating agent, but a coating agent that can form a film on the surface of the paper and reduce the liquid permeability is preferable. By coating the inside of the wrapper 112, even when the amount of the aerosol base material contained in the aerosol generation segment is large, the penetration of the aerosol base material into the wrapper 112 can be suppressed.

[0020] Further, the aerosol generation segment 110 may have a fitting portion with a heater member or the like for heating the aerosol generation article 100.

[0021] The length of the aerosol generation segment 110 in the long axis direction can be appropriately changed according to the size of the product, but it is usually 5 mm or more, preferably 7 mm or more, more preferably 10 mm or more, and usually 70 mm or less, preferably 50 mm or less, more preferably 30 mm or less, and even more preferably 25 mm or less.

[0022] The ventilation resistance of the aerosol generation segment 110 is usually 0.1 mmHg ２ O / mm to 20 mmHg ２ O / mm, preferably 0.5 mmHg ２ O / mm to 15 mmHg ２ O / mm, more preferably 1.0 mmHg ２ O / mm to 10 mmHg ２ O / mm.

[0023] The tobacco filler 111 may contain an aerosol base material that generates an aerosol. The type of aerosol base material is not particularly limited, and various natural extracts and / or their components can be selected depending on the application. Examples of aerosol base materials include glycerin, propylene glycol, triacetin, 1,3-butanediol, and mixtures thereof. The content of the aerosol base material in the tobacco filler 111 is not particularly limited, but from the viewpoint of generating a sufficient aerosol and imparting a good flavor, it is usually 5% by weight or more, preferably 10% by weight or more, and usually 50% by weight or less, preferably 15% by weight or more and 25% by weight or less, relative to the total amount of the tobacco filler. The tobacco filler 111 may also contain a flavoring agent.

[0024] <Sheet material contained in the aerosol-generating segment> The sheet material is not particularly limited as long as it contains tobacco raw materials, and known materials can be used. The amount of tobacco raw materials (e.g., dried tobacco leaves) contained in the aerosol-generating segment 110 is not particularly limited, but can be between 200 mg and 800 mg, and preferably between 250 mg and 600 mg. This range is particularly suitable for an aerosol-generating segment 110 with a circumference of 22 mm and a length of 20 mm.

[0025] The method of filling the aerosol generating segment 110 with the sheet material is not particularly limited. For example, the sheet material may be wrapped in a wrapper 112, or the sheet material may be filled into a tubular wrapper 112. If the shape of the aerosol generating segment 110 is a substantially rectangular parallelepiped with a longitudinal direction, the aerosol generating segment 110 may be filled in such a way that its longitudinal direction is in an unspecified direction within the wrapper 112, or it may be filled in an aligned manner so that it is aligned along the longitudinal axis of the aerosol generating segment 110 or perpendicular to the longitudinal axis. For example, the sheet material may be cut into widths of 0.5 mm to 2.0 mm (lengths of, for example, 5 mm to 40 mm) and filled in a random orientation, or the sheet material may be cut into widths of 1.0 mm to 3.0 mm (lengths of, for example, 5 mm to 40 mm) and filled in an aligned manner parallel to the longitudinal axis, or the sheet material may be crimped (processed to create vertical grooves) and then gathered and filled. When the aerosol generating segment 110 is heated, the tobacco components contained in the aerosol generating segment 110 vaporize, and upon inhalation, these vaporize and transfer to the intermediate segment 120 and the mouthpiece segment 130.

[0026] The width of the sheet material depends on the size and shape of the aerosol generating segment 110. For example, if the aerosol generating segment 110 is a rod shape with a major axis length of 14 mm and a diameter of 7 mm, the width is usually 50 mm to 250 mm, more preferably 100 mm to 200 mm, and even more preferably 140 mm to 160 mm. If the width of the sheet material is within the above range, sufficient aerosol can be generated.

[0027] <Tip Segment> The aerosol product 100 may include a tip segment 113 adjacent to the upstream side in the longitudinal direction of the aerosol generating segment 110, as shown in Figure 3, for example. The tip segment 113 may have a filler 114 inside and be wrapped with a wrapper 112 (tip segment wrapper). The filler 114 may include cellulose acetate fibers, natural pulp fibers, etc. Preferably, the filler 114 contains paper. The tip segment 113 may further contain an aerosol base material or a fragrance, etc. If the tip segment 113 contains an aerosol base material, the tip segment 113 will also constitute a part of the aerosol generating segment. By providing the tip segment 113, it is possible to suppress the filling 111 from spilling out of the aerosol generating segment 110. In Figure 3, the aerosol generating segment 110 and the tip segment 113 are wrapped and connected by chip paper 140a (second chip paper). Furthermore, these two connected segments, the intermediate segment 120, and the mouthpiece segment 130 are wound and connected by tip paper 140 (first tip paper).

[0028] The cross-sectional shape of the tip segment 113 is substantially circular, and the diameter of the circle can be appropriately changed according to the size of the product. The length of the tip segment 113 in the longitudinal direction can be appropriately changed according to the size of the product, but is usually 3 mm or more and 15 mm or less, and preferably 5 mm or more and 10 mm or less.

[0029] <Mouthpiece Segment> Embodiments of the present invention relate to a filter for aerosol products, comprising an additive-containing segment, wherein the additive-containing segment includes a sheet material wound by a wrapper, the sheet material contains an additive, the additive has phenol filtering ability and a melting point of 70°C or lower. The filter can be used as a mouthpiece segment 130 of an aerosol product 100.

[0030] <Additive-containing segment> The filter for aerosol products of this embodiment includes an additive-containing segment. The additive-containing segment includes a sheet material wound by a wrapper, and the sheet material contains an additive described later. By including the additive-containing segment in the filter of this embodiment, phenol can be sufficiently filtered.

[0031] The additive-containing segment has pores, and it is preferable that the cumulative pore volume of all pores in the additive-containing segment is 1.5 mL / g or more. The pore volume in this specification is obtained by measuring the distribution of pores having a predetermined range of pore diameters (pore distribution) in the additive-containing segment by the mercury intrusion method. The "cumulative pore volume" in this specification is the value obtained by dividing the cumulative volume of pores having a predetermined range of pore diameters by the mass of the additive-containing segment. If the additive-containing segment contains a paper tube or other component that does not function as a filter medium, these components are excluded when measuring the cumulative pore volume. Furthermore, the cumulative pore volume is measured on the segment to which the additive has been added (not the segment before the additive was added). The term "pores" as used here primarily refers to minute holes in the sheet material filling the additive-containing segments, or minute gaps between sheets that may arise due to the packing state of the sheets. These are minute holes and gaps that affect the measurement results of the mercury intrusion method within the range of the measurement pressure (mercury pressure) of the mercury intrusion method. On the other hand, when mercury is injected into the sample container, it is injected at a pressure lower than the measurement pressure, and at this time, mercury is also injected into relatively large gaps within the aerosol-generating segments. Such relatively large gaps into which mercury can be injected at a pressure lower than the measurement pressure are not included in the definition of "pores."

[0032] The pore volume is measured using the mercury intrusion method. In the mercury intrusion method, the pressure applied to the mercury is varied, and the amount of mercury that penetrates the pores of the sample is measured. The conditions under which mercury can penetrate the pores can be expressed as D = -4σcosθ / P, where P is the pressure, D is the pore diameter, θ is the contact angle of the mercury, and σ is the surface tension. If the contact angle and surface tension are constants, then the pressure P is inversely proportional to the pore diameter D into which mercury can penetrate. Therefore, the pore distribution can be determined by replacing the horizontal axis P of the P-V curve, obtained by measuring the pressure P and the amount of liquid V that penetrates at that time, with the pore diameter, using this equation.

[0033] For measurement, a mercury intrusion pore volume analyzer (MicroActive AutoPore V 9600, manufactured by Micromeristics) is used. The mercury pressure is set to 1.07–423.15 psi, the mercury contact angle θ is 140°, and the surface tension σ is 480 dynes / cm. The pore distribution is calculated from the measurement results using the accompanying software. In this test method, the pore volume is obtained as the volume per unit weight of each segment. To further analyze the pore distribution, the difference pore volume dV is divided by the difference value d (logD) of the pore diameter treated as a logarithm, and this value is plotted on the vertical axis as the log differential pore volume. By plotting the pore diameter on the horizontal axis, a graph of the log differential pore volume distribution is obtained. In addition, the cumulative pore volume can be calculated by integrating the pore volumes at each pore diameter. Hereinafter, "cumulative pore volume" refers to the cumulative volume over pores with a diameter of 0.5 to 200 μm.

[0034] The cumulative pore volume of all pores in the additive-containing segment is preferably 1.5 mL / g or more, more preferably 2.0 mL / g or more, and particularly preferably 2.5 mL / g or more. There is no particular upper limit to the cumulative pore volume, but it is usually 6.0 mL / g or less, may be 5.0 mL / g or less, or 4.0 mL / g or less. Preferred ranges include, for example, 1.5 to 6.0 mL / g, 2.0 to 5.0 mL / g, 2.5 to 4.0 mL / g, etc.

[0035] The inventors have found that the phenol filtration capacity can be improved by increasing the cumulative pore volume of the additive-containing segment to a predetermined value or higher. Although the reason for this is not clear, the inventors speculate that when the cumulative pore volume is above a predetermined value, the contact between the generated aerosol and the additive is optimized as the aerosol flows through the additive-containing segment.

[0036] <Sheet material included in the mouthpiece segment> The filter according to this embodiment is composed of a segment having a filter medium 150 made of a sheet material, which constitutes a mouthpiece segment 130. Examples of materials that constitute the sheet material include cellulose, polylactic acid, poly(3-hydroxybutyrate-co-3-hydroxyhexanoate), polylactic acid / polycaprolactone copolymer, polyglycolic acid, polylactic acid / polyether copolymer, butanediol / long-chain dicarboxylic acid copolymer, polybutylene adipate terephthalate, polytetramethylene adipate terephthalate, polyethylene terephthalate succinate, polybutylene succinate, polybutylene succinate adipate, polyvinyl alcohol, etc., with cellulose being particularly preferred. A filter using a sheet material containing cellulose is also called a paper filter.

[0037] Cellulose-containing sheet materials are typically paper made from pulp. The type of pulp is not particularly limited, and pulp from woods such as conifers and deciduous trees can be used. When a sheet material contains pulp, it is preferable that the filtration capacity of the pulp in the sheet material be 700 mL or more. By using a sheet material with such a filtration capacity, the pulp fuzzing is reduced, the entanglement of fibers is reduced, and the pore volume of the sheet material increases (the pore distribution shows a peak on the side of larger pores). This improves the phenol filtration capacity of the filter. If the filtration capacity is less than 700 mL, the pulp fuzzing is greater and the fibers are more tightly entangled, resulting in a smaller number of pores. On the other hand, there is no particular upper limit to the filtration capacity of the pulp, but it is, for example, 1000 mL or less.

[0038] The above-mentioned range of water-permeability of the sheet material pulp can be applied to the sheet material constituting the additive-containing segment. When the mouthpiece segment 130 includes two segments as shown in Figures 2 and 3, it is preferable that the first segment 130a is an additive-containing segment and that the pulp contained in the sheet material included in the first segment 130a has a water-permeability within the above range. On the other hand, it is preferable from the viewpoint of further improving phenol filtration capacity that the water-permeability of the pulp contained in the sheet material included in the second segment 130b on the upstream side in the longitudinal axis is 300 mL or less. When the mouthpiece segment 130 includes multiple segments, the phenol filtration capacity is further improved by adding an additive to the sheet material of the segment composed of a sheet material having high water-permeability. When the mouthpiece segment 130 includes multiple segments, it is preferable that the water-permeability of the pulp contained in the sheet material constituting the additive-containing segment is greater than the water-permeability of the pulp contained in the sheet material constituting the segment located upstream of the additive-containing segment. For example, the water filtration rate of the sheet material constituting the second segment 130b is more preferably 280 mL or less, and even more preferably 200 mL or less. On the other hand, there is no particular lower limit, but it may be 100 mL or more.

[0039] The water filtration rate of the pulp in the sheet material is a value measured after the paper of the sheet material has been disintegrated and returned to a fibrous state, and is specifically measured by the following procedure. First, the sheet material is disintegrated according to JIS P 8220-1. Then, the water filtration rate of the obtained pulp suspension is measured according to JIS P 8121-2. If disintegration of the sheet material is difficult with ordinary water, disintegration may be performed with a 4% sodium hydroxide aqueous solution, followed by washing with water. This process may be repeated multiple times (for example, three times) until the sheet material is disintegrated. To adjust the water filtration rate of the sheet material within the above range, the raw materials of the sheet material should be appropriately selected, and the manufacturing method should be adjusted. For example, the type of pulp, fiber length, and amount used as the raw material for the sheet material, as well as the type and amount of filler, should be adjusted, and the degree of beating during manufacturing, the papermaking method, and the press pressure should also be adjusted. Furthermore, the type of paper used as the filter material is not particularly limited, and gathered paper, pleated paper, crimped paper, crepe paper, nonwoven fabric, and even shredded paper can be used. In addition, the paper can be manufactured using either a wet or dry process, and can be selected as desired.

[0040] The air permeability of the sheet material is not particularly limited, but is preferably 3,000 cholesta units or more. There is no particular upper limit, but it is usually 40,000 cholesta units or less. An air permeability of 3,000 cholesta units or more of the sheet material is preferable from the viewpoint of further improving the phenol filtration capacity. The air permeability of the sheet material is more preferably 3,500 to 30,000 cholesta units, and even more preferably 10,000 to 25,000 cholesta units. The above air permeability of the sheet material can be applied to the sheet material constituting the additive-containing segment. When the mouthpiece segment 130 includes two segments as shown in Figures 2 and 3, it is preferable that the first segment 130a is the additive-containing segment and that the sheet material included in the first segment 130a has an air permeability within the above range. Furthermore, it is preferable from the viewpoint of further improving the phenol filtration capacity that the air permeability of the sheet material included in the second segment 130b on the upstream side in the longitudinal direction be 100 cholesta units or less. When the mouthpiece segment 130 includes multiple segments, the phenol filtration capacity is further improved by adding an additive to the sheet material of the segment composed of a sheet material with high air permeability. When the mouthpiece segment 130 includes multiple segments, it is preferable that the air permeability of the sheet material constituting the additive-containing segment is greater than that of the sheet material constituting the segment located upstream of the additive-containing segment. For example, the air permeability of the sheet material constituting the second segment 130b is more preferably 50 cholester units or less, and even more preferably 0 cholester units. The air permeability of the sheet material constituting the second segment 130b is usually 0 or greater. To adjust the water filtration and air permeability of the sheet material within the above range, the raw materials of the sheet material can be appropriately selected, or the manufacturing method can be adjusted. For example, the type of pulp, fiber length, and amount used as the raw material for the sheet material, as well as the type and amount of filler, can be adjusted, and the degree of beating during manufacturing, the papermaking method, and the press pressure can also be adjusted.

[0041] The form of the filter material can be a collection of sheet-like filter materials, and in the case of paper filters in particular, a form can be a collection of paper having a wave-shaped structure with multiple valleys and ridges. When using paper with a wave-shaped structure, the orientation of the valleys (or ridges) in the longitudinal direction is arranged to be parallel to the longitudinal axis of the filter. When using paper having the above-mentioned wave-shaped structure as the paper material constituting the paper filter, it is preferable that one or more sheets are crimped and folded in an overlapping manner so that the folds are substantially parallel to the longitudinal axis and then wound onto a mouthpiece wrapper. This configuration ensures an airflow channel in the longitudinal direction and allows for efficient phenol filtration by improving contact between the aerosol and the additive in the additive-containing segment. The crimp depth is preferably 0.1 mm to 1 mm, and more preferably 0.3 mm to 0.7 mm. It is also preferable that the crimp depth of the sheet material constituting the additive-containing segment is within the above range.

[0042] The thickness of the sheet material is not particularly limited, but is usually 20 μm or more, preferably 25 μm or more, more preferably 30 μm or more, and usually 140 μm or less, preferably 130 μm or less, and more preferably 120 μm or less. The basis weight of the sheet material is not particularly limited, but is usually 20 gsm or more, preferably 25 gsm or more, and usually 60 gsm or less, preferably 50 gsm or less, and more preferably 45 gsm or less. As an example, the thickness of the sheet material may be 60 μm to 80 μm. The basis weight of the sheet material may be 20 gsm to 30 gsm. The density of the sheet material is 0.25 to 0.4 g / cm³. ３ This may also be the case. The basis weight of the sheet material can be adjusted by adjusting the pulp content and filler content, or by adjusting the processing conditions of the wet paper machine used during papermaking.

[0043] The width of the raw material sheet is not particularly limited, but is usually 50 mm or more, preferably 100 mm or more, more preferably 170 mm or more, and also 300 mm or less, preferably 250 mm or less, and more preferably 230 mm or less. The width of the raw material sheet is the length in the direction perpendicular to the long axis in which the peaks and valleys of the corrugated paper are continuously arranged, or in other words, the length in the direction perpendicular to the direction corresponding to the long axis of the filter material obtained by processing the corrugated paper.

[0044] The sheet material contains additives. The amount of additives per segment made up of the sheet material can be 1 to 100 mg, preferably 5 to 50 mg, and more preferably 10 to 25 mg. This amount is determined from the viewpoint of achieving phenol filtration capacity and preventing leakage.

[0045] <Additive with phenol filtering ability and a melting point of 70°C or lower> The sheet material in this embodiment contains an additive (hereinafter sometimes simply referred to as "additive") that has phenol filtering ability and a melting point of 70°C or lower. By containing this additive in the sheet material, phenol can be sufficiently removed from smoke, aerosols, etc. that pass through the filter.

[0046] The additive is not particularly limited as long as it has phenol filtering ability and a melting point of 70°C or lower, but it is preferably one or more compounds selected from the group consisting of triethyl citrate, fatty acids having 8 to 10 carbon atoms, polyethylene glycol, polypropylene glycol, polybutylene glycol, polyethylene glycol sorbitan fatty acid ester, polypropylene glycol glyceryl ether, polyglycerin fatty acid ester, propylene glycol, diglycerin, caprylyl glycol, propylene glycol fatty acid ester, glycerin fatty acid ester, sorbitan fatty acid ester, sucrose fatty acid ester, fatty acid alkyl ester, phospholipid, hydroxy fatty acid, and high-erucine rapeseed superhydrogenated oil.

[0047] The weight-average molecular weight (Mw) of polyethylene glycol, polypropylene glycol, polybutylene glycol, polyethylene glycol sorbitan fatty acid ester, polypropylene glycol glyceryl ether, and polyglycerin fatty acid ester is not particularly limited and may be, for example, 500 or more and 100,000 or less. The weight-average molecular weight of polypropylene glycol and polypropylene glycol glyceryl ether is preferably 1,000 or more, more preferably 2,000 or more, even more preferably 3,000 or more, and also preferably 10,000 or less, more preferably 7,000 or less, and even more preferably 4,000 or less, in order to suppress ink runoff as described later.

[0048] The fatty acid portion in polyethylene glycol sorbitan fatty acid esters, polyglycerin fatty acid esters, propylene glycol fatty acid esters, glycerin fatty acid esters, sorbitan fatty acid esters, and sucrose fatty acid esters can be, for example, the same as the fatty acids described later, and is preferably a saturated fatty acid. A specific example of a sucrose fatty acid ester is sucrose acetate isobutyrate ester. In addition, any combination of sucrose acetate isobutyrate ester and the additives listed above can be preferably exemplified. Saturated fatty acid esters are less likely to produce off-odors due to decomposition over time even without the addition of antioxidants such as vitamin E, and the risk of adverse effects on quality is lower than that of unsaturated fatty acid esters. Examples of such saturated fatty acid esters include glycerin fatty acid esters such as triacetin, glycerin monocaprate, and glycerin behenate ester. The number of fatty acid ester bonds per molecule is not particularly limited and may be a number that leaves two or more hydroxyl groups in one molecule, a number that leaves one hydroxyl group, or a number that esterifies all hydroxyl groups.

[0049] The fatty acid may be either a straight-chain fatty acid or a branched-chain fatty acid, and may be either a saturated fatty acid or an unsaturated fatty acid. The number of carbon atoms in the fatty acid is not particularly limited, but is usually 2 or more, preferably 8 or more, more preferably 12 or more, and usually 30 or less, preferably 26 or less, more preferably 22 or less. Specific fatty acids include acetic acid, lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, undecenoic acid, palmitoleic acid, oleic acid, linoleic acid, linolenic acid, docosahexaenoic acid, eicosapentaenoic acid, and the like.

[0050] Examples of fatty acid portions of fatty acid alkyl esters include those similar to the fatty acids mentioned above, and for the reasons stated above, saturated fatty acids are preferred. The alkyl group of the fatty acid alkyl ester may be either a linear alkyl group or a branched alkyl group. The number of carbon atoms in the alkyl group is usually 1 or more, preferably 2 or more, and usually 12 or less, preferably 8 or less, and more preferably 4 or less. Examples of alkyl groups include methyl group, ethyl group, n-propyl group, iso-propyl group, n-butyl group, sec-butyl group, tert-butyl group, n-pentyl group, neopentyl group, n-hexyl group, n-heptyl group, n-octyl group, n-nonyl group, n-decyl group, n-undecyl group, n-dodecyl group, and the like.

[0051] Hydroxy fatty acids include those obtained by substituting a hydroxyl group for a carbon in the aliphatic hydrocarbon group of the above-mentioned fatty acids. The position and number of hydroxyl groups are not particularly limited. A preferred hydroxy fatty acid is 12-hydroxystearic acid, in which a hydroxyl group is substituted for the carbon at position 12 of stearic acid.

[0052] Phospholipids are preferably those having one or more ester bonds and / or ether bonds per molecule, and more preferably two or more, in order to obtain high phenol filtering capacity. The upper limit of the number of such bonds in a phospholipid is not particularly limited, but is usually 10 or less, and may be 8 or less, 6 or less, or 4 or less. Specific examples of phospholipids include lecithin, especially soy lecithin and egg lecithin.

[0053] The component having phenol filtering ability is preferably one or more compounds selected from the group consisting of triethyl citrate, triacetin, fatty acids having 8 to 10 carbon atoms, polypropylene glycol, glycerin fatty acid esters, propylene glycol, sucrose fatty acid esters, and hydroxypropyl cellulose, as these exhibit high phenol filtering ability among the above. Furthermore, in a preferred embodiment of this example, the component having phenol filtering ability is liquid above its melting point (a component having phenol filtering ability at a melting point of 70°C or lower is sometimes referred to as a "liquid having phenol filtering ability").

[0054] The components exhibiting phenol filtering ability, as exemplified above, not only have high phenol filtering capacity, but can also remove phenols other than phenols, such as o-cresol, m-cresol, and p-cresol; pyridines; pyrazines; quinoline; styrene, etc.

[0055] In this embodiment, an additive having phenol filtering ability and a melting point of 70°C or lower is used as the additive for removing phenol. As will be described in detail later in the "Mouthpiece Wrapper" section, by providing a liquid-repellent layer in the area of ​​the wrapper that wraps the sheet material and comes into contact with the sheet material to which the additive has been added, it becomes possible to more effectively prevent liquid leakage from the sheet material even if the additive leaks out during storage.

[0056] The total amount of additives in the entire filter, including the sheet material and wrapper, is preferably 1 mg or more, more preferably 5 mg or more, even more preferably 10 mg or more, and also preferably 250 mg or less, more preferably 50 mg or less, and even more preferably 30 mg or less. By keeping the additive content within the above range, specific components contained in smoke, aerosols, etc., can be sufficiently removed. Furthermore, if the additive content is within the above range, problems such as a significant change in the airflow resistance of the filter, a significant decrease in the manufacturability of the filter, and leakage of liquid outside the filter when pressure is applied to the filter can be avoided.

[0057] The additive may contain known additives such as thickeners, fragrances, and colorants. Furthermore, the additive may contain impurities such as water, as long as they do not hinder the effects of the present invention. Among known additives, thickeners are preferred because they can prevent liquid leakage caused by the additive and enhance the effect of maintaining a good appearance.

[0058] The thickening agent is not particularly limited as long as it can be retained in the additive, and examples include xanthan gum, gellan gum, psyllium seed gum, pectin, carboxymethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, polyvinyl alcohol, agarose, pullulan, alginic acid, polyacrylic acid, urethane compounds, and alkali metal salts or alkaline earth metal salts thereof. Of these, hydroxypropylcellulose, hydroxypropylmethylcellulose, or carboxymethylcellulose are preferred. In particular, since hydroxypropylcellulose and hydroxypropylmethylcellulose have phenol filtering ability on their own, using them in combination with an additive that has phenol filtering ability can prevent liquid leakage caused by the additive and provide sufficient phenol filtering ability. In order to prevent liquid leakage caused by the additive, the viscosity of the additive is 3000 Pa·s or more at room temperature, preferably 5000 mPa·s or more. With such viscosity, even if the additive content is relatively large, specifically, even if the total content of the additive relative to the entire filter (mouthpiece segment) is 200 mg or more, or even 250 mg or more, liquid leakage caused by the additive can be prevented. The aforementioned thickening agents can be used to adjust the viscosity of the additive.

[0059] <Mouthpiece Segment Morphology and Shape> The mouthpiece segment 130 is not particularly limited and can be a plain filter containing an additive-containing segment as a single segment, or a multi-segment filter containing multiple segments such as a dual filter or triple filter having another segment in addition to the additive-containing segment. For example, as shown in Figures 2 and 3, if the filter according to this embodiment is a multi-segment filter, at least one segment should be an additive-containing segment. According to the filter according to this embodiment, even a mouthpiece segment consisting of a single segment can sufficiently remove phenol. In the case of a filter consisting of a single segment, that is, when the filter is composed of the additive-containing segment, the additive may be added to the center in the longitudinal direction or to the sheet material constituting the entire segment, or it may be added so as to be unevenly distributed to the sheet material on the mouthpiece end side of the segment. When the filter is composed of multiple segments, it is preferable from the viewpoint of phenol filtering ability that the additive-containing segment is arranged on the mouthpiece end side in the longitudinal direction. As illustrated by Figures 2 and 3, when the second segment 130b is positioned upstream in the longitudinal direction from the additive-containing segment, it is preferable that the additive is not added to the second segment 130b, and is added only to the first segment 130a. On the other hand, the additive may also be added to the second segment 130b. The second segment 130b may be a paper tube. In this case, the sheet material does not need to be placed inside the paper tube.

[0060] The shape of the filter is not particularly limited, and a known shape can be adopted. It can usually be cylindrical and can take the following forms. Also, as shown in Figure 4, when the additive-containing segment alone constitutes the mouthpiece segment 130, a paper tube 170 with a hollow (void) cross-section in the circumferential direction may be provided inside the additive-containing segment. The paper tube 170 is preferably provided on the upstream side in the longitudinal direction inside the additive-containing segment. The paper tube 170 is preferably provided so as to be coaxial with the center of the circumferential cross-section of the paper tube when the center of the circumferential cross-section of the filter is used as the axis. Furthermore, the cross-sectional shape of the paper tube in the direction perpendicular to the longitudinal direction is preferably substantially circular, and the diameter of the circle is preferably smaller than the diameter of the circle of the additive-containing segment. Furthermore, the length of the paper tube 170 in the longitudinal direction is preferably shorter than that of the additive-containing segment. With this configuration, when the generated aerosol flows through the additive-containing segment, the aerosol passes through the hollow portion where the paper tube 170 is placed, and the sheet material placed outside the paper tube 170 functions as an insulating layer, making it less likely for the user to feel heat on their lips. Furthermore, where the paper tube 170 is placed, the aerosol passes through the hollow portion and filtration by the sheet material does not occur. Therefore, the amount of aerosol delivered can be increased.

[0061] The cross-sectional shape of the mouthpiece segment in the direction perpendicular to the major axis is substantially circular, and the diameter of the circle can be appropriately changed according to the size of the product, but is usually 4.0 mm or more, preferably 4.5 mm or more, more preferably 5.0 mm or more, and usually 9.0 mm or less, preferably 8.5 mm or less, more preferably 8.0 mm or less. The length of the mouthpiece segment in the direction of the major axis can be appropriately changed according to the size of the product, but may be 5 mm or more, 10 mm or more, 15 mm or more, 17.5 mm or more, or 20.0 mm or more, and may also be 40 mm or less, 35 mm or less, 32.5 mm or less, or 30.0 mm or less. If the mouthpiece segment is composed of two segments, for example as shown in Figures 2 and 3, the length in the direction of the major axis of each segment may be 5 mm or more, or 8 mm or more, and may also be 20 mm or less, 15 mm or less, or 13.0 mm or less. Furthermore, if the mouthpiece segment includes multiple segments, it is preferable that the total length in the direction of the major axis of those segments is within the range of the length in the direction of the major axis of the mouthpiece segment described above.

[0062] The airflow resistance per 120 mm along the long axis of the mouthpiece segment 130 is not particularly limited, but is typically 50 mmH ２ 0 mmH or higher, preferably 80 mmH ２ 0 or more, more preferably 100 mmH ２ 0 or higher, and normally 600 mmH ２ 0 or less, preferably 300 mmH ２ 0 or less, more preferably 200 mmH ２ It is less than 0. The air permeability resistance per 1 mm in the longitudinal direction of the additive-containing segment is typically 0.4 mmH ２ 0 mmH or greater, preferably 0.5 mmH ２ 0 mmH or higher, more preferably 1.0 mmH ２ 0 or higher, and normally 2.0 mmH ２ 0 mmH or less, preferably 1.7 mmH ２It is less than or equal to 0. When the mouthpiece segment is composed of two segments as shown in Figures 2 and 3, it is preferable that the airflow resistance of the first segment 130a is greater than the airflow resistance of the second segment 130b. Furthermore, even when the mouthpiece segment includes three or more segments, it is preferable that the airflow resistance of the additive-containing segment is always greater than the airflow resistance of the upstream segment. The airflow resistance of the additive-containing segment is preferably 0.4 mmH ２ O / mm~2.0mmH ２ 0 / mm, more preferably 0.5mmH ２ O / mm~2.0mmH ２ The density is 0 / mm, and more preferably 1.0 mmH ２ O / mm~1.7mmH ２ It is 0 / mm. The airflow resistance of the segment upstream of the additive-containing segment is 0 mmH ２ O / mm~1.0mmH ２ It is preferable that the ratio is 0 / mm. If the segment upstream of the additive-containing segment contains sheet material internally, the air permeability resistance is 0.1 mmH ２ O / mm~1.0mmH ２ Preferably, it is 0 / mm, and more preferably 0.2 mmH ２ O / mm~0.4mmH ２ It is 0 / mm. Also, if the segment upstream of the additive-containing segment is a paper tube, the airflow resistance is 0 mmH ２ O / mm~0.1mmH ２ It is preferable that it be 0 / mm, and 0 mmH ２ 0 / mm is more preferable. If the mouthpiece segment includes multiple segments, it is preferable that their combined airflow resistance is within the range of the airflow resistance of the mouthpiece segment 130.

[0063] The airflow resistance of the filter can be measured according to the ISO standard method (ISO 6565), similar to the measurement of the airflow resistance of the aerosol products described above. It is known that, as with aerosol products, the relationship between filter airflow resistance and filter length is proportional within the commonly used length range (5 mm to 200 mm), meaning that if the length doubles, the filter's airflow resistance doubles as well.

[0064] The amount of sheet material to be filled into the mouthpiece segment 130 depends on the size and shape of the mouthpiece segment 130, but as an example, if the mouthpiece segment is rod-shaped with a major axis length of 20 mm and a diameter of 7 mm, it is usually 50 mg to 500 mg, preferably 100 mg to 350 mg, and more preferably 130 mg to 250 mg. The amount of sheet material to be placed inside the additive-containing segment depends on the size and shape of the segment, but as an example, if the segment is rod-shaped with a major axis length of 8 mm and a diameter of 7 mm, it is usually 15 to 100 mg, preferably 20 to 60 mg, and more preferably 30 mg to 40 mg. It is preferable to fill the sheet material within the above range whether the segments constituting the mouthpiece segment consist only of additive-containing segments or include other segments. On the other hand, if the paper tube 170 shown in Figure 4 is included inside the segment, it is usually 30 mg to 300 mg, preferably 50 mg to 200 mg, and more preferably 80 mg to 150 mg. The packing density of the sheet material in the mouthpiece segment 130 is preferably 0.06 g / cm³. ３ ~0.65 g / cm ３ More preferably 0.13 g / cm³ ３ ~0.45 g / cm ３ , more preferably 0.17 g / cm³ ３ ~0.33 g / cm ３ Furthermore, the packing density of the sheet material in the additive-containing segment is preferably 0.05 g / cm³. ３ ~0.30 g / cm ３ , more preferably 0.07 g / cm³ ３ ~0.20 g / cm ３ And more preferably 0.10 g / cm³ ３ ~0.13 g / cm３ Therefore, if the packing density of the sheet material is within the above range, it is easier to control the cumulative pore volume within a desirable range, resulting in excellent phenol filtration capacity. Furthermore, even if the segments constituting the mouthpiece segment consist only of additive-containing segments, or if other segments are included, it is preferable to pack the sheet material so that it falls within the above range. On the other hand, if the paper tube 170 shown in Figure 4 is included in the segment, it is preferable that the packing density excluding the paper tube is within the above range.

[0065] <Mouthpiece Wrapper> The filter of this embodiment includes a wrapper for winding a sheet material, and the wrapper may be an inner plug wrap 160. If the filter is a multi-segment filter, the inner plug wrap 160 may wind two or more segments individually or together. On the other hand, if two or more segments are wound individually with the inner plug wrap 160, the multiple segments may be fixed by an outer plug wrap 161. The material, thickness, weight, etc. of the outer plug wrap 161 are not particularly limited, and the same paper as the inner plug wrap 160 can be used. In this specification, the inner plug wrap and outer plug wrap are collectively referred to as a mouthpiece wrapper. The form of the inner plug wrap 160 is not particularly limited, and may include one or more seams containing adhesive. The adhesive may include a hot melt adhesive. The adhesive may also contain polyvinyl alcohol.

[0066] The material of the mouthpiece wrapper is not particularly limited, and known materials can be used. The mouthpiece wrapper may also contain fillers such as calcium carbonate. The thickness of the mouthpiece wrapper is not particularly limited, but is usually 20 μm or more, preferably 30 μm or more, and usually 140 μm or less, preferably 130 μm or less, and more preferably 120 μm or less. The basis weight of the mouthpiece wrapper is not particularly limited, but is usually 20 gsm or more, preferably 22 gsm or more, more preferably 23 gsm or more, and usually 100 gsm or less, preferably 95 gsm or less, and more preferably 90 gsm or less.

[0067] In this embodiment, the inner plug wrap 160 of the mouthpiece wrap preferably has a liquid-repellent layer in the area that comes into contact with the sheet material which is the filter medium. The liquid-repellent layer is a layer that repels liquids derived from additives, particularly liquid components that have phenol filtering ability (liquids that have phenol filtering ability). By providing a liquid-repellent layer at a specific location on the mouthpiece wrapper, especially the inner plug wrap 160, it is possible to suppress the diffusion of liquid leaked from the additive during storage along the surface of the wrapper, thereby suppressing liquid leakage from the edges of the mouthpiece wrapper.

[0068] The mouthpiece wrapper may consist only of a liquid-repellent layer, or it may have a base material and a liquid-repellent layer disposed on the surface of the base material. If the rolled paper has a base material and a liquid-repellent layer disposed on the surface of the base material, the mouthpiece wrapper may be formed by laminating a coating agent containing a material that forms the liquid-repellent layer onto the surface of the base material by means of application, vapor deposition, etc., as described later. The base material is not particularly limited and includes known papers used for mouthpiece wrappers, nonwoven fabrics made of polymer fibers, liquid-repellent paper, etc.

[0069] The material used to form the liquid-repellent layer may be appropriately selected from polymers, metals, inorganic oxides, etc. The material used to form the liquid-repellent layer may be used alone, or two or more materials may be used in any combination and ratio. The mouthpiece wrapper may be made of liquid-resistant paper or may be coated with polysaccharides.

[0070] When multiple segments are fixed with an outer plug wrap, the material, thickness, weight, etc. of the outer plug wrap are not particularly limited and can be the same as those for the roll paper described above. The liquid-repellent layer may be provided on at least a portion of the outer plug wrap.

[0071] <Phenol Filtration Capacity and Efficiency of Phenol Filtration Capacity> The filter of this embodiment can sufficiently remove phenol. Its phenol removal performance can be evaluated by the phenol filtration capacity expressed by the following formula (i): Phenol filtration capacity = DPR1 / DPR0 (i) Furthermore, the efficiency of the expression of phenol filtration capacity differs depending on the sheet material. The efficiency of the expression of phenol filtration capacity can be evaluated by the efficiency of the expression of phenol filtration capacity expressed by the following formula (ii): Efficiency of the expression of phenol filtration capacity = (DPR1' - DPR1) / DPR1' (ii) DPR1: The value obtained by dividing the amount of phenol permeate from the aerosol passing through the filter by the amount of particulate matter in the tobacco smoke passing through the filter when a smoking test is performed using the filter whose phenol filtration capacity is to be evaluated. DPR0: The value obtained by dividing the amount of phenol permeate from the aerosol passing through the standard filter by the amount of particulate matter in the tobacco smoke passing through the standard filter when a smoking test is performed using the standard filter. DPR1': The value obtained by dividing the amount of phenol permeated from the aerosol passing through the filter by the amount of particulate matter in the tobacco smoke passing through the filter, when a smoking test is performed using the same filter as the filter whose phenol filtering ability is to be evaluated, except that it does not contain additives that have phenol filtering ability.

[0072] The phenol filtration capacity of the filter in this embodiment is preferably 0.85 or less, more preferably 0.70 or less, even more preferably 0.50 or less, and particularly preferably 0.40 or less, because a smaller value allows for greater reduction of phenol when used with aerosol products. The lower limit of the phenol filtration capacity of the filter in this embodiment is not particularly limited and is usually 0 or greater.

[0073] The efficiency of phenol filtration performance of the filter in this embodiment indicates that the filter's configuration exhibits a higher phenol removal effect from the additive the larger the value. Preferably, it is 0.2 or higher, more preferably 0.3 or higher, and even more preferably 0.4 or higher.

[0074] The amount of phenol permeate and the amount of particulate matter in tobacco smoke used in the calculation of equations (i) and (ii) are calculated as follows: (1) A sample of aerosol product is prepared by connecting a filter (the filter to be evaluated) and an aerosol generation segment with tip paper. (2) The aerosol product sample is automatically smoked using an automatic smoking machine (e.g., Cerulean SM410), and particulate matter in tobacco smoke is collected with a glass fiber filter (e.g., Cambridge filter "Borgwaldt 44 mmφ"). The conditions for automatic smoking are, for example, a smoke intake volume of 17.5 mL / sec, a smoke intake time of 2 seconds / puff, a smoke intake frequency of 1 puff / min, and a cigarette butt length of 35 mm. (3) The difference in mass of the glass fiber filter before and after smoking is determined as the amount of particulate matter in tobacco smoke collected. (4) Phenol is extracted from the glass fiber filter after collection using an extraction solvent such as tert-butyl methyl ether. The amount of phenol permeate from tobacco smoke is determined by analyzing the extract using gas chromatography-mass spectrometry (GC-MSD). For GC-MSD, for example, Agilent G7890A from Agilent Technologies Inc. can be used as the GC, and for example, Agilent 5795C from Agilent Technologies Inc. can be used as the MSD. The average value obtained by repeating the above step multiple times may be used as the amount of phenol permeate and the amount of particulate matter in tobacco smoke. For example, the average value of three measurements. However, in the above step, the amount of particulate matter in tobacco smoke collected in one glass fiber filter may be from one sample of aerosol product, or from multiple samples of the same type of aerosol product, for example, from two samples.

[0075] <Method for Manufacturing Filters> The method for manufacturing filters is not particularly limited and can be manufactured by known methods. For example, if the filter is made of paper containing pulp, it can be manufactured by forming a rod shape using paper obtained by papermaking from wood pulp. Specifically, for example, a filter can be manufactured by the following steps: crimping the paper obtained by papermaking to create a corrugated wrinkle in the paper; assembling the resulting corrugated paper to produce a filter material; winding the resulting filter material with roll paper to produce a rod-shaped long filter; and cutting the rod-shaped long filter to a desired length. Additives can be added to the sheet material at any stage. For example, they may be added after the step of creating a corrugated wrinkle in the sheet material and before the step of producing the rod-shaped long filter, or they may be added after the step of producing the rod-shaped long filter.

[0076] Conventional paper machines, such as cylinder screen machines, inclined short screen machines, long screen machines, and short screen machines, can be used, and the paper machines can be combined as appropriate according to the required characteristics. Dry manufacturing methods for resin-bonded nonwoven fabrics, thermal-bonded nonwoven fabrics, spunlace nonwoven fabrics, etc., can also be used as appropriate.

[0077] Filters made from materials other than paper can be manufactured by forming the material into a sheet and then following the manufacturing method described above. Alternatively, filters can be manufactured by bundling fibrous materials together, winding them onto rolled paper to form a rod, and then cutting it to the desired length.

[0078] The addition of additives to the sheet material is carried out by first preparing the additive, and then applying the obtained additive to the filter material and / or the sheet material before it is formed into a filter material, such as by coating it.

[0079] Additives can be used alone, or they can be prepared by mixing them with other additives such as thickeners, flavorings, and colorants as needed.

[0080] The method of adding the additive to the filter media is not particularly limited, and known methods can be used. Specifically, these include liquid delivery or spraying using a pressurized pump; application using a coating roller, brush, etc. Alternatively, the additive may be heated before being added to the filter media to give it fluidity.

[0081] <Intermediate Segment> The aerosol product 100 may have an intermediate segment 120, and the configuration of the intermediate segment 120 is not particularly limited as long as it has the function of cooling the vapor produced by heating the aerosol generation segment. For example, cardboard can be processed into a cylindrical shape. In this case, the inside of the cylinder is hollow, and the vapor containing the aerosol base material and tobacco flavor components comes into contact with the air inside the cavity and is cooled.

[0082] One embodiment of the intermediate segment 120 is a paper tube made by processing a single sheet of paper or multiple sheets of paper glued together into a cylindrical shape. Furthermore, it is preferable that there are openings around the paper tube or the like for introducing outside air in order to increase the cooling effect by bringing outside air at room temperature into contact with high-temperature steam. The intermediate segment 120 is provided with openings 103 for taking in outside air. The number of openings 103 in the intermediate segment 120 is not particularly limited.

[0083] <Tip Paper> The material of the tip paper 140 connecting two or more selected from the aerosol generating segment 110, the intermediate segment 120, and the mouthpiece segment 130 is not particularly limited, and known materials can be used. The tip paper 140 may also contain fillers such as calcium carbonate. Furthermore, at least a portion of the tip paper 140 may be provided with a liquid-repellent layer or a liquid-resistant layer similar to the liquid-repellent layer that the mouthpiece wrapper may have.

[0084] In this embodiment, as shown in Figures 1 to 4, the segments are not limited to those that exist continuously in the longitudinal direction, but also include embodiments in which there are no segments other than the segment in contact with the inlet end of the filter, that is, embodiments in which there are gaps (also called cavities) between segments. Such cavities can be formed by molding the above-mentioned molded paper or chip paper into a cylindrical shape, but in this case, it is not necessarily required that the molded paper or the like that forming the cavity has a liquid-repellent layer.

[0085] <Non-combustion type aerosol generation system> The aerosol product 100 described above can be used together with a non-combustion type aerosol generation device that heats the aerosol product 100. That is, a non-combustion type aerosol generation system (also simply called the "non-combustion type aerosol generation system"), which is another embodiment of the present invention, is a non-combustion type aerosol generation system comprising the aerosol product described above and a non-combustion type aerosol generation device that heats the aerosol product. The configuration of the non-combustion type aerosol generation system is not particularly limited and can be configured as shown in Figure 5, for example. Figure 5 is a diagram illustrating the internal structure of the non-combustion type aerosol generation system 200. The aerosol product 100 in Figure 5 is a schematic representation of the aerosol product 100 in Figure 1.

[0086] The non-combustible aerosol generation system 200 comprises an aerosol product 100 and a non-combustible aerosol generation device 30 that heats the aerosol generation segment 110 of the aerosol product 100. The aerosol product 100 is housed in a housing section 310 that can be inserted into and removed from the housing section 310 through an insertion port 3A of the non-combustible aerosol generation device 30.

[0087] In the non-combustion type aerosol generating device 30, when used by a user, the aerosol product 100 is inserted into the housing section 310. In this state, a heater provided in the housing section 310 is heated, and the flavor source within the aerosol product 100 is heated, thereby generating an aerosol containing components such as tobacco for the user to inhale. Alternatively, the heater may directly heat the aerosol generating segment 110, or it may heat the aerosol source within the aerosol product 100, supplying the heated aerosol to the aerosol generating segment 110, and the heated aerosol further heats the tobacco components within the aerosol generating segment 110 for the user to inhale. The heater may also heat the aerosol generating segment 110 from the outside or from the inside. If a susceptor heated by induction heating is provided within the aerosol generating segment 110, the non-combustion type aerosol generating device 30 may be provided with an induction coil instead of a heater.

[0088] The non-combustion type aerosol generating device 30 has an outer wall 301 and a housing 31 which is a casing for housing various components. Inside the housing 31 are a heater 32, a temperature sensor 35, a suction sensor 36, a control unit 37, a power supply 38, and the like.

[0089] The present invention will be described in more detail by examples, but the present invention is not limited to the following examples unless it exceeds the gist of the invention.

[0090] <Manufacturing of Additive-Containing Segments> Filters containing additive-containing segments were manufactured using the following materials: ・Sheet material 1: Glassine paper: Low permeability paper (Permeability: 0 CU, Filtration rate: 190 mL) ・Sheet material 2: High permeability paper 1 (Permeability: 10,000 CU, Filtration rate: 730 mL) ・Sheet material 3: High permeability paper 2 (Permeability: 24,000 CU, Filtration rate: 739 mL) ・Sheet material 4: High permeability paper 3 (Permeability: 12,000 CU, Filtration rate: 735 mL) The physical properties of each sheet material are summarized in Table 1. - Inner plug wrap: Oil-resistant paper with starch coating, basis weight 35 gsm, thickness 40 μm - Outer plug wrap: Paper with a basis weight of 27 gsm, thickness 50 μm

[0091] Using a paper filter manufacturing machine equipped with a crimp roller, the aerosol-generating segment (second segment) and the inlet end segment (first segment) were fabricated. A dual-segment filter was manufactured by winding the two segments with a wrapper. Additives were also added to the segment sheet material as shown in Tables 2 and 3. The length (width) perpendicular to the filter's long axis, the length in the long axis direction, the crimp depth, and the air permeability of each segment are listed in Table 1. In Table 1, CU, which represents the unit of air permeability, stands for Cholesterol Units.

[0092] <Measurement of Cumulative Pore Volume> The cumulative pore volume of the additive-containing segment was measured using the mercury intrusion method described above.

[0093] <Air permeability resistance> The air permeability resistance of each segment was measured according to the ISO standard method (ISO 6565:2015) described above. TEC: Triethyl citrate PPG: Polypropylene glycol (weight-average molecular weight: 4000)

[0094] <Phenol Filtration Capacity Test> Using the filters prepared in each experimental example, the aerosol generation segment, intermediate segment, and mouthpiece segment were arranged in a line in order from furthest from the mouthpiece end, and these were rolled up with tip paper to prepare the aerosol product. The aerosol generation segment used was a commercially available Möbius Deep Regular Ploom X filter. The intermediate segment was a 20 mm long hollow tube. The mouthpiece segment consisted of a first segment and a second segment, with a length of 20 mm.

[0095] Next, the phenol filtration capacity of the filters for each aerosol product was evaluated using the following method. Each aerosol product was inserted into an electric heating device (PloomX, manufactured by Japan Tobacco Inc.), and the device was switched on. The smoking test was started after the device became ready for smoking. The smoking test was conducted using a single-cigarette automatic smoking machine manufactured by Borgward, with 11 puffs of smoking conducted every 30 seconds, with 55 mL / 2 sec = 1 puff. Aerosols were collected with a Cambridge filter after each puff. After the smoking test, each Cambridge filter was extracted with 10 mL of ethanol, and the amount of phenol was measured by GC-MS. For the evaluation of phenol filtration capacity, the amount of phenol permeation in Experimental Example 1 (using glassine paper (sheet material 1) as the sheet material in both segments, with no additives added to the sheet material) was set to 1, and the evaluation was conducted in terms of how much the amount of phenol permeation had decreased compared to this. In other words, Experimental Example 1 was set to DPR0.

[0096] Figure 6 summarizes the phenol filtration capacity test results for Experimental Examples 1 to 6, shown in Table 2. Experimental Example 1 and Experimental Example 2 differ in whether or not an additive (triethyl citrate) was added to the first segment of the filter. Compared to Experimental Example 1, Experimental Example 2 showed a reduced phenol permeability, indicating that phenol filtration occurred due to the presence of the additive. While the sheet material used in the second segment is the same for Experimental Examples 1, 3, and 4, the sheet material used in the first segment differs in that it is a sheet material with high air permeability and high water filtration capacity. Furthermore, Experimental Examples 3 and 4 differ in whether or not an additive (triethyl citrate) was added to the first segment. Comparing Experimental Example 1 and Experimental Example 3, it can be seen that the differences in air permeability and water filtration capacity result in differences in phenol filtration capacity. Comparing Experimental Examples 3 and 4, it can be seen that adding the additive (triethyl citrate) to the sheet material of the first segment resulted in a significant improvement in its phenol filtration capacity. Furthermore, comparing Experimental Examples 2 and 4, there is a difference in phenol filtration capacity despite the addition of the same additive to the first segment. Also, the filter configuration in Experimental Example 4 exhibits higher efficiency in the development of phenol filtration capacity compared to the filter configuration in Experimental Example 2. From this, it can be seen that adding an additive to a sheet material with high air permeability and high water filtration capacity significantly improves phenol filtration capacity. In Experimental Examples 5 and 6, a sheet material with high air permeability and high water filtration capacity was also used for the first segment, with the difference being whether or not an additive (triethyl citrate) was added to the first segment. In Experimental Examples 5 and 6, the same trend as in Experimental Examples 3 and 4 was obtained. In addition, from comparing Experimental Examples 2 and 6, and from the difference in the efficiency of the development of phenol filtration capacity, it can be seen that adding an additive to a sheet material with high air permeability and high water filtration capacity significantly improves phenol filtration capacity.

[0097] Figure 7 summarizes the results of the phenol filtration capacity tests for Experimental Examples 7 to 12, shown in Table 3. Comparing Experimental Examples 7 and 8, in Experimental Example 7, the segment to which the additive is added is the second segment, while in Experimental Example 8, it is the first segment. Similarly, in Experimental Examples 9 and 10, and Examples 11 and 12, the former differs in that the segment to which the additive is added is the second segment, while the latter differs in that it is the first segment. From these comparisons, it was found that adding the additive to the first segment resulted in a more significant improvement in phenol filtration capacity than adding the additive to the second segment.

[0098] Figure 8 summarizes the phenol filtration capacity test results for Experimental Examples 1 and 13-15, shown in Table 4. In Experimental Examples 13-15, the crimp depth of the sheet material constituting the first segment to which the additive was added was varied. It was found that the phenol filtration capacity improved as the crimp depth increased.

[0099] Aerosol products having the segments shown in Table 5 (Experimental Examples 16-21) were prepared. The cumulative pore volume in Table 5 represents the value accumulated in the pore diameter range of 0.5 to 200 μm in the first segment. When the phenol filtration capacity of each experimental example shown in Table 5 was checked, the order was Experimental Example 18 > Example 17 > Example 16 > Experimental Example 21 > Experimental Example 20 > Experimental Example 19.

[0100] 100 Aerosol product 101 Mouthpiece end 102 Tip 103 Opening 110 Aerosol generating segment 111 Tobacco filler 112 Rolling paper 120 Intermediate segment 130 Mouthpiece segment 140 Tip paper 150 Filter material 160 Mouthpiece wrapper 200 Non-combustible aerosol generating system 30 Electric heating device 31 Housing 310 Enclosure 32 Heater 35 Temperature sensor 36 Suction sensor 37 Control unit 38 Power supply

Claims

1. A filter for aerosol products, wherein the filter comprises an additive-containing segment, the additive-containing segment includes a sheet material wound by a wrapper, the sheet material contains an additive, the additive has phenol filtering ability, and has a melting point of 70°C or less.

2. The filter according to claim 1, wherein the additive-containing segment has pores, and the cumulative pore volume of all pores in the additive-containing segment is 1.5 mL / g or more.

3. The filter according to claim 1 or 2, wherein the sheet material comprises pulp having a water filtration rate of 700 mL or more.

4. The filter according to any one of claims 1 to 3, wherein the air permeability of the sheet material is 3,000 Cholesta units or more.

5. The filter according to any one of claims 1 to 4, wherein the basis weight of the sheet material is 20 gsm or more and 60 gsm or less.

6. The filter according to any one of claims 1 to 5, wherein the filter has another segment on the upstream side of the additive-containing segment in the longitudinal direction.

7. The airflow resistance of the other segment is 0 to 1.0 mmH ２ The filter according to claim 6, wherein the density is 0 / mm.

8. The filter according to any one of claims 1 to 7, wherein the additive-containing segment constitutes the segment on the intake end side of the aerosol product.

9. The air permeability resistance of the additive-containing segment is 0.4 to 2.0 mmH. ２ A filter according to any one of claims 1 to 8, wherein the density is 0 / mm.

10. The filter according to claim 6, wherein another segment located upstream of the additive-containing segment in the longitudinal direction comprises a sheet material wound with a wrapper, the sheet material comprising pulp having a water filtration rate of 300 mL or less.

11. The filter according to claim 6 or 7, wherein the air permeability of the sheet material contained in another segment located upstream of the additive-containing segment in the longitudinal direction is 0 cholesterol units.

12. The filter according to any one of claims 1 to 11, wherein the additive-containing segment is provided with a hollow paper tube on the upstream side in the longitudinal direction inside.

13. An aerosol product comprising a filter according to any one of claims 1 to 12 and an aerosol generating segment on the upstream side in the longitudinal direction thereof.

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