Filter segment for aerosol-generating article and aerosol-generating article

Abstract

This filter segment for an aerosol-generating article comprises a filter medium sheet comprising cellulose, an adsorbent sheet containing a solid adsorbent, and a wrapper with which the filter medium sheet and the adsorbent sheet are covered together in a cylindrical shape. The width of the filter medium sheet is at least one time the width of the adsorbent sheet.

Description

Filter segments and aerosol products for aerosol products

[0001] This disclosure relates to filter segments for aerosol products and aerosol products.

[0002] Patent Document 1 discloses a filter segment in which a carbon-free web and a carbon-containing paper are compressed in a cylindrical segment and surrounded by a plug-wound paper.

[0003] Japanese Patent Application Publication No. 7-67613

[0004] In filter segments for aerosol products, an adsorbent sheet containing a solid adsorbent may be used along with a filter media sheet containing cellulose. Because the adsorbent sheet has higher rigidity than the filter media sheet, it may be difficult to maintain the filter segment in the desired shape if the amount of adsorbent sheet relative to the filter media sheet is large. The purpose of this disclosure is to make it easier to maintain the filter segment in the desired shape in a filter segment including a filter media sheet and an adsorbent sheet compared to a case where the width of the filter media sheet is less than one times the width of the adsorbent sheet.

[0005] The present disclosure, completed with this objective in mind, is a filter segment for aerosol products comprising a filter media sheet containing cellulose, an adsorbent sheet containing a solid adsorbent, and a wrapper that covers the filter media sheet and the adsorbent sheet together in a cylindrical shape, wherein the width of the filter media sheet is at least one times the width of the adsorbent sheet. Here, the filter media sheet and the adsorbent sheet are crimped, and the filter media sheet may be crimped more strongly than the adsorbent sheet. The filter media sheet and the adsorbent sheet do not have to contain plasticizers. The adsorbent sheet does not have to contain a binder. The adsorbent content in the adsorbent sheet may be in the range of 1 mg to 30 mg. The adsorbent sheet is arranged on the outer circumference of the folded and compressed filter media sheet, and the ends of the adsorbent sheet do not have to overlap in the circumferential direction. The adsorbent sheet may be at least partially adhered to the wrapper. Furthermore, the adsorbent sheet may have different surface roughness on its front and back sides, and may be arranged with the side with the greater surface roughness facing the inner circumference. Also, the adsorbent sheet may be placed between the folded and compressed filter sheets. Furthermore, when the cross section cut in the axial direction is divided into an inner region located within the range of half the radius from the center and an outer region located outside the inner region, 50% or more of the adsorbent sheet may be located in the outer region. Also, the filter segment for aerosol products may comprise a first filter segment including the filter sheet, the adsorbent sheet, and the wrapper, and a second filter segment connected to one end of the first filter segment, including another filter sheet containing cellulose, and having a greater airflow resistance than the first filter segment. Furthermore, the filter media sheet and adsorbent sheet of the first filter segment, and the other filter media sheet of the second filter segment may be crimped, and the other filter media sheet of the second filter segment may be crimped more strongly than the filter media sheet and adsorbent sheet of the first filter segment.From another perspective, the present disclosure is an aerosol product comprising a substrate portion containing an aerosol source and a filter segment for the aerosol product located downstream of the substrate portion.

[0006] According to this disclosure, in a filter segment including a filter media sheet and an adsorbent sheet, it is possible to make it easier to maintain the filter segment in the desired shape compared to the case where the width of the filter media sheet is less than one times the width of the adsorbent sheet.

[0007] This figure shows an example of a cross-section of the filter segment according to this embodiment, cut along the airflow direction. (a) to (b) are examples of cross-sections of the filter segment according to this embodiment, cut along a plane perpendicular to the airflow direction. This figure shows an example of the filter material sheet and adsorbent sheet of the filter segment in an unfolded state. This figure shows an example of a method for manufacturing the filter segment to which this embodiment is applied. This figure shows an example of a cross-sectional view of the filter segment according to Embodiment 2, cut along a plane perpendicular to the airflow direction. This figure shows an example of the configuration of a non-combustion heated tobacco product. This figure shows an example of the configuration of a combustion tobacco product. This figure shows the measurement results of the amount of crotonaldehyde transmitted through the filters of Examples 1 to 3, and Comparative Examples 1 and 2.

[0008] Embodiments relating to this disclosure will be described in detail below with reference to the attached drawings. In each drawing, the same parts are denoted by the same reference numerals.

[0009] [Embodiment 1] (Filter Segment 1) Figure 1 shows an example of a cross-section of the filter segment 1 according to this embodiment, cut along the airflow direction. Figures 2(a) to 2(b) show an example of a cross-section of the filter segment 1 according to this embodiment, cut along a plane perpendicular to the airflow direction. Figures 2(a) to 2(b) correspond to the cross-sectional view of part II of the filter segment 1 shown in Figure 1. The filter segment 1 according to this embodiment is used as a filter segment for non-combustible heated tobacco or combustible tobacco, which are examples of aerosol products, as will be described later. The filter segment 1 is an example of a filter segment for aerosol products, or the first filter segment in a filter segment for aerosol products. The airflow direction of the filter segment 1 may also be referred to as the axial direction of the filter segment 1.

[0010] The filter segment 1 comprises a filter media sheet 10 containing cellulose and an adsorbent sheet 20 containing a solid adsorbent. The filter segment 1 also includes a wrapper 30 that covers the filter media sheet 10 and the adsorbent sheet 20 together in a cylindrical shape.

[0011] In the filter segment 1 of this embodiment, the filter media sheet 10 is folded and compressed into a cylindrical shape. More specifically, the filter media sheet 10 is folded and compressed in the radial direction of the filter segment 1. As will be described in detail later, when the compressed filter media sheet 10 is unfolded, it has a rectangular shape. The adsorbent sheet 20 is arranged on the outer circumference of the folded and compressed filter media sheet 10. More specifically, the adsorbent sheet 20 is wound around the outer surface of the folded and compressed cylindrical filter media sheet 10. As will be described in detail later, when the wound adsorbent sheet 20 is unfolded, it has a rectangular shape.

[0012] (Wrapper 30) The wrapper 30 is wrapped around the outer circumference of the adsorbent sheet 20, which is wrapped around the outer circumference of the filter material sheet 10, and covers the filter material sheet 10 and the adsorbent sheet 20 in a cylindrical shape. The wrapper 30 has an overlapping portion 35 where one end 31 overlaps the other end 32 in the circumferential direction. The wrapper 30 may also be bonded at this overlapping portion 35, with one end 31 and the other end 32 being bonded together with an adhesive. The adhesive may include a hot-melt adhesive, and this hot-melt adhesive may include ethylene vinyl acetate or polyvinyl acetate.

[0013] The material of the wrapper 30 is not particularly limited and any known material can be used, and it may also contain fillers such as calcium carbonate. The thickness of the wrapper 30 is not particularly limited, but is usually 20 μm to 140 μm, preferably 3 μm to 130 μm, and more preferably 30 μm to 120 μm. The basis weight of the wrapper 30 is not particularly limited, but is usually 20 gsm to 100 gsm, preferably 22 gsm to 95 gsm, and more preferably 23 gsm to 90 gsm. The wrapper 30 may or may not be coated, but from the viewpoint of providing functions other than strength and structural rigidity, it is preferable to coat it with a desired material.

[0014] (Filter Sheet 10) The filter sheet 10 is a sheet-like substrate containing cellulose. Examples of the filter sheet 10 include nonwoven fabric or paper made from natural cellulose or regenerated cellulose. Nonwoven fabric or paper made from natural cellulose or regenerated cellulose tend to have higher decomposability compared to cellulose acetate used in conventional filter segments. By using a nonwoven fabric or paper made from natural cellulose or regenerated cellulose as the filter sheet 10, it is possible to improve the decomposability of the filter segment 1 including the filter sheet 10. It is preferable to use a nonwoven fabric made from natural cellulose or regenerated cellulose as the filter sheet 10. By using a nonwoven fabric made from natural cellulose or regenerated cellulose as the filter sheet 10, pores are less likely to form between the filter sheets 10 when the filter sheet 10 is compressed into a cylindrical shape. This reduces variations in air permeability resistance in the filter segment 1. Porches are gaps that extend in the air permeability direction that are formed between the filter sheets 10 when the filter sheet 10 is compressed.

[0015] The basis weight of the filter media sheet 10 is not particularly limited, but is usually 20 gsm or more and 100 gsm or less, preferably 25 gsm or more and 60 gsm or less, and more preferably 30 gsm or more and 50 gsm or less.

[0016] The thickness of the filter material sheet 10 is not particularly limited, but is usually between 20 μm and 1000 μm. Furthermore, if the filter material sheet 10 is paper, its thickness is usually between 25 μm and 250 μm, and preferably between 30 μm and 60 μm. Also, if the filter material sheet 10 is a nonwoven fabric, its thickness is usually between 100 μm and 800 μm, and preferably between 250 μm and 500 μm.

[0017] The filter sheet 10 is manufactured using a known web formation method or a known web bonding method. The web formation method is not particularly limited, but examples include dry laid methods such as air laid and card laid, wet laid methods, meltblown methods, and spunbond methods. The web bonding method is not particularly limited, but examples include needle punching, hydroentangling, thermal bonding, and adhesive bonding methods.

[0018] The filter sheet 10 may contain an additive that specifically adsorbs components other than carbonyls in the aerosol generated by the aerosol product, such as phenols. Known absorbents can be used as the additive that adsorbs phenols. Preferably, triacetin, triethyl citrate, polyalkylene glycol, medium-chain triglycerides, sucrose fatty acid esters, polyvinyl acetate, ethylene-vinyl acetate copolymer, hydroxypropyl cellulose, propylene glycol, and monocaprin are used as such absorbents, and triethyl citrate, polyalkylene glycol, medium-chain triglycerides, and sucrose fatty acid esters are more preferably used. These may be used individually or in combination. Furthermore, these absorbents may be added to the outside of the cellulose-containing substrate constituting the filter sheet 10, or they may be added to the inside of the substrate.

[0019] Furthermore, it is preferable that the filter media sheet 10 does not contain plasticizers. If the filter media sheet 10 contains plasticizers, the plasticizers may be adsorbed onto the solid adsorbent of the adsorbent sheet 20 (described later), which may reduce the adsorption performance of the adsorbent sheet 20. By not including plasticizers in the filter media sheet 10, the reduction in the adsorption performance of the adsorbent sheet 20 is suppressed. Examples of plasticizers commonly used in the filter media sheet 10 include triacetin and triethyl citrate.

[0020] It is preferable that the filter media sheet 10 is crimped. More specifically, it is preferable that the filter media sheet 10 is crimped before it is compressed into a cylindrical shape. Crimping is a process in which a sheet-like substrate is passed between two members with interlocking grooves, thereby forming a wave-shaped fold in the sheet-like substrate. When the filter media sheet 10 is crimped, its rigidity is reduced compared to when it is not crimped. As a result, when the filter media sheet 10 is compressed into a cylindrical shape, gaps are less likely to form between the filter media sheets 10. This reduces variations in airflow resistance in the filter segment 1.

[0021] As will be described later, the adsorbent sheet 20 may or may not be crimped, but if the adsorbent sheet 20 is crimped, it is preferable that the filter sheet 10 is crimped more strongly than the adsorbent sheet 20. Here, strong crimping means that the depth of the wave-shaped folds formed on the sheet-like substrate is large, and the spacing between the wave-shaped folds formed on the sheet-like substrate is small. The strength of the crimping can be determined by disassembling the molded filter segment 1, observing the shape of the folds on the filter sheet 10 or the adsorbent sheet 20, and measuring the depth and spacing of the folds. In the following, the depth of the wave-shaped folds formed on the sheet-like substrate by the crimping will be referred to as the crimping depth, and the spacing between the wave-shaped folds will be referred to as the crimping spacing.

[0022] The crimping depth of the crimping treatment applied to the filter media sheet 10 is not particularly limited, but is usually 0.1 mm to 1.5 mm, preferably 0.3 mm to 0.8 mm, and more preferably 0.5 mm to 0.6 mm. The crimping spacing of the crimping treatment applied to the filter media sheet 10 is not particularly limited, but is usually 0.7 mm to 3 mm, and preferably 1 mm to 2 mm.

[0023] (Adsorbent Sheet 20) The adsorbent sheet 20 is a sheet-like substrate containing a solid adsorbent. More specifically, the adsorbent sheet 20 has a solid adsorbent added to the interior of a sheet-like substrate containing cellulose. Examples of the sheet-like substrate containing cellulose that constitutes the adsorbent sheet 20 include nonwoven fabric or paper made from natural cellulose or regenerated cellulose. In the filter segment 1 of this embodiment, the inclusion of a solid adsorbent inside the adsorbent sheet 20 suppresses the shedding of the adsorbent compared to, for example, a configuration in which a solid adsorbent is placed between compressed sheet-like substrates.

[0024] The basis weight of the adsorbent sheet 20 is not particularly limited, but is usually 20 gsm or more and 100 gsm or less, and is preferably 40 gsm or more and 90 gsm or less. The thickness of the adsorbent sheet 20 is not particularly limited, but is usually 30 μm or more and 500 μm or less, and is preferably 100 μm or more and 300 μm or less.

[0025] As the solid adsorbent contained in the adsorbent sheet 20, any known adsorbent capable of adsorbing carbonyl compounds among the components contained in the aerosol generated by the aerosol product can be used. Such adsorbents are not particularly limited, but examples include activated carbon, hydrotalcite, silica gel, zeolite, alumina, etc. These may be used individually or in combination. Among these, activated carbon is more preferable.

[0026] The content of the adsorbent in the adsorbent sheet 20 is not particularly limited, but is usually 5 gsm or more and 80 gsm or less, and preferably 40 gsm or more and 60 gsm or less. From another perspective, the content of the adsorbent in the adsorbent sheet 20 is preferably 1 mg or more and 30 mg or less per one filter segment 1. More specifically, when the filter segment 1 is used for an aerosol-generating article, the diameter of the filter segment 1 is usually 7 mm or more and 8 mm or less, and the length of the filter segment 1 is usually 10 mm or more and 15 mm or less. In this case, the content of the adsorbent in the adsorbent sheet 20 is preferably 1 mg or more and 30 mg or less.

[0027] The adsorbent sheet 20, similarly to the filter medium sheet 10, is manufactured using a known web forming method or a known web bonding method. The web forming method is not particularly limited, and examples thereof include dry laid methods such as air laid and carded laid, wet laid method, melt blown method, spunbond method, and the like. The web bonding method is not particularly limited, and examples thereof include needle punching method, hydroentangling method, thermal bonding method, adhesive bonding method, and the like. Then, in these production methods, the adsorbent sheet 20 can be obtained by causing a solid adsorbent to be supported inside a sheet-shaped base material containing cellulose at an arbitrary timing and by an arbitrary method.

[0028] It is preferable that the adsorbent sheet 20 does not contain a plasticizer and a binder. When the adsorbent sheet 20 contains a plasticizer or a binder, the adsorption performance of the adsorbent sheet 20 may be reduced due to the plasticizer or binder being adsorbed by the solid adsorbent. When the adsorbent sheet 20 does not contain a plasticizer and a binder, a reduction in the adsorption performance of the adsorbent sheet 20 is suppressed. Examples of plasticizers generally used for the adsorbent sheet 20 include triacetin, triethyl citrate, and the like. Further, examples of binders generally used for the adsorbent sheet 20 include polyvinyl acetate, ethylene-vinyl acetate copolymer, and the like.

[0029] Depending on its manufacturing method, there may be a difference in surface roughness between the front surface and the back surface of the adsorbent sheet 20. When there is a difference in surface roughness between the front surface and the back surface of the adsorbent sheet 20, the adsorbent sheet 20 is preferably arranged such that the surface with higher surface roughness faces the inner peripheral side.

[0030] The adsorbent sheet 20 may or may not be subjected to crimping treatment. When the adsorbent sheet 20 is subjected to crimping treatment, the rigidity of the adsorbent sheet 20 is lower than that when the adsorbent sheet 20 is not subjected to crimping treatment. When the adsorbent sheet 20 is subjected to crimping treatment, it is preferable that the adsorbent sheet 20 is subjected to weaker crimping treatment than the filter medium sheet 10.

[0031] The crimp depth of the crimping treatment applied to the adsorbent sheet 20 is not particularly limited, but is usually 0.05 mm or more and 0.7 mm or less, preferably 0.1 mm or more and 0.5 mm or less, and more preferably 0.1 mm or more and 0.3 mm or less. Further, the crimp interval of the crimping treatment applied to the adsorbent sheet 20 is not particularly limited, but is usually 0.5 mm or more and 5 mm or less, and preferably 1 mm or more and 3 mm or less.

[0032] As described above, the adsorbent sheet 20 is wound around the outer surface of the cylindrically compressed filter material sheet 10. Preferably, one end 21 and the other end 22 of the adsorbent sheet 20 wound around the outer surface of the filter material sheet 10 do not overlap in the circumferential direction of the filter segment 1. In this case, as shown in Figures 2(a) to (b), one end 21 and the other end 22 of the adsorbent sheet 20 face each other in the circumferential direction of the filter segment 1. If one end 21 and the other end 22 of the adsorbent sheet 20 overlap in the circumferential direction, the thickness and rigidity of the overlapping portion increase, making it easy for the shape of the filter segment 1 to deviate from the desired shape. In contrast, in this embodiment, by not overlapping one end 21 and the other end 22 of the adsorbent sheet 20 in the circumferential direction, it becomes easier to maintain the shape of the filter segment 1 in the desired shape, for example, a cylindrical shape. In other words, it becomes easier to maintain the circularity of the cross-sectional shape of the filter segment 1. Note that the cross-section of filter segment 1 referred to here is the cross-section of the filter segment 1 perpendicular to the airflow direction.

[0033] The case in which one end 21 and the other end 22 of the adsorbent sheet 20 do not overlap in the circumferential direction includes both the case in which one end 21 and the other end 22 of the adsorbent sheet 20 are spaced apart in the circumferential direction, and the case in which one end 21 and the other end 22 of the adsorbent sheet 20 are abutting against each other and in contact. The distance between one end 21 and the other end 22 of the adsorbent sheet 20 is preferably 10% or less, and more preferably 5% or less, of the circumferential length of the filter segment 1 (the circumference when the cross-sectional shape of the filter segment 1 is circular). The distance between one end 21 and the other end 22 of the adsorbent sheet 20 may be 0% of the circumferential length of the filter segment 1. Note that the case in which one end 21 and the other end 22 of the adsorbent sheet 20 are abutting against each other and in contact corresponds to the case in which one end 21 and the other end 22 of the adsorbent sheet 20 are abutting against each other and in contact. If the distance between one end 21 and the other end 22 of the adsorbent sheet 20 exceeds 10% of the circumferential length of the filter segment 1, the adsorption performance of the adsorbent sheet 20 may be insufficient.

[0034] Preferably, at least a portion of the adsorbent sheet 20 is bonded to the wrapper 30, which is wrapped around the outer circumference of the adsorbent sheet 20, with an adhesive. By bonding the adsorbent sheet 20 and the wrapper 30, the adsorbent sheet 20 and the filter material sheet 10, which is positioned on the inner circumference of the adsorbent sheet 20, are prevented from falling off the wrapper 30. Alternatively, at least a portion of the adsorbent sheet 20 may be bonded to the filter material sheet 10, which is positioned on the inner circumference of the adsorbent sheet 20, with an adhesive. By bonding the adsorbent sheet 20 and the filter material sheet 10, the filter material sheet 10 is prevented from falling off the adsorbent sheet 20. The adhesive is not particularly limited, but for example, a hot melt adhesive or a vinyl acetate adhesive can be used. The same adhesive used to bond the overlapping portion 35 between one end 31 and the other end 32 of the wrapper 30 may be used as the adhesive.

[0035] In a cross-section of the adsorbent sheet 20 in a plane perpendicular to the airflow direction of the filter segment 1, the position of the opposing portion 25 where one end 21 and the other end 22 face each other may be the same as the overlapping portion 35 of the wrapper 30, as shown in Figure 2(b), or it may be shifted in the circumferential direction, as shown in Figure 2(a). When the position of the opposing portion 25 of the adsorbent sheet 20 is shifted in the circumferential direction relative to the overlapping portion 35 of the wrapper 30, it is preferable that the central angle between the opposing portion 25 and the overlapping portion 35 is within ±30°.

[0036] Here, since the adsorbent sheet 20 is formed by deforming a flat base material into a cylindrical shape along the outer surface of the filter material sheet 10, a repulsive force may be generated at one end 21 and the other end 22 that spreads outwards from the filter segment 1. In contrast, the overlapping portion 35 where one end 31 and the other end 32 of the wrapper 30 overlap and are bonded together has higher rigidity compared to other areas of the wrapper 30. In the filter segment 1, the position of the opposing portion 25 of the adsorbent sheet 20 is close to the position of the overlapping portion 35 of the wrapper 30, which suppresses the deformation of the filter segment 1 from its intended shape due to the repulsive force of the adsorbent sheet 20. In other words, it becomes easier to maintain the circularity of the cross-sectional shape of the filter segment 1.

[0037] (Relationship between filter media sheet 10 and adsorbent sheet 20) Figure 3 shows an example of the filter media sheet 10 and adsorbent sheet 20 of the filter segment 1 (see Figure 1) in an unfolded state. Figure 3 shows the cylindrical compressed filter media sheet 10 in an unfolded state. Also, Figure 3 shows the adsorbent sheet 20, which is cylindrically wound around the outer circumference of the filter media sheet 10, in an unfolded state. As shown in Figure 3, in the filter segment 1 of this embodiment, the width w1 of the filter media sheet 10 is at least 1 times the width w2 of the adsorbent sheet 20, preferably at least 1.5 times, and more preferably at least 2 times.

[0038] As described above, the filter media sheet 10 and the adsorbent sheet 20 have a rectangular shape when unfolded. The width w1 of the filter media sheet 10 is the length of the filter media sheet 10 in the direction perpendicular to the airflow direction of the filter segment 1 when unfolded. Similarly, the width w2 of the adsorbent sheet 20 is the length of the adsorbent sheet 20 in the direction perpendicular to the airflow direction of the filter segment 1 when unfolded. The width w2 of the adsorbent sheet 20 corresponds to the circumferential length of the adsorbent sheet 20 that is cylindrically wound around the outer surface of the filter media sheet 10 in the filter segment 1.

[0039] Here, since the adsorbent sheet 20 contains a solid adsorbent inside, it tends to have higher rigidity than the filter media sheet 10. For this reason, if the amount of adsorbent sheet 20 is large relative to the filter media sheet 10, it may be difficult to maintain the shape of the filter segment 1 in the desired shape. In other words, if the width w2 of the adsorbent sheet 20 is large relative to the width w1 of the filter media sheet 10, it may be difficult to maintain the shape of the filter segment 1 in the desired shape. In contrast, in the filter segment 1 of this embodiment, by making the width w1 of the filter media sheet 10 at least 1 times, preferably 1.5 times or more, and more preferably 2 times or more, the shape of the filter segment 1 in the desired shape becomes easier to maintain. More specifically, when the filter segment 1 is cylindrical as in this embodiment, by making the width w1 of the filter media sheet 10 at least 1 time, preferably 1.5 times or more, and more preferably 2 times or more, the circularity of the cross-sectional shape of the filter segment 1 becomes easier to maintain.

[0040] Incidentally, the filter segment 1 described above comprises one filter media sheet 10, but the number of filter media sheets 10 may be multiple. Furthermore, the filter segment 1 may be made by compressing multiple filter media sheets 10 together into a cylindrical shape. When the filter segment 1 comprises multiple filter media sheets 10, the width w1 of the filter media sheets 10 means the sum of the widths w1 of the multiple filter media sheets 10. Similarly, the filter segment 1 may comprise multiple adsorbent sheets 20. When the filter segment 1 comprises multiple adsorbent sheets 20, the width w2 of the adsorbent sheets 20 means the sum of the widths w2 of the multiple adsorbent sheets 20. On the other hand, from the viewpoint of simplifying the manufacturing process of the filter segment 1, it is preferable that the number of filter media sheets 10 and adsorbent sheets 20 be one each.

[0041] (Method for Manufacturing Filter Segment 1) Next, the method for manufacturing the filter segment 1 of this embodiment will be described. Figure 4 is a diagram showing an example of the method for manufacturing the filter segment 1 to which this embodiment is applied. The filter segment 1 is manufactured using a long, continuous roll of filter media sheet 10, a roll of adsorbent sheet 20, and a roll of wrapper 30, all of which are continuous in the airflow direction of the filter segment 1. In this example, the roll of filter media sheet 10 has a width w1 that is at least one times the width w2 of the roll of adsorbent sheet 20. In the following description, the long, continuous roll of filter media sheet 10, the roll of adsorbent sheet 20, and the roll of wrapper 30, which are the raw materials for the filter segment 1, may be simply referred to as filter media sheet 10, adsorbent sheet 20, and wrapper 30, respectively.

[0042] When manufacturing the filter segment 1, the raw material of the filter media sheet 10, which has been crimped as needed, is sent to the compression mechanism 110. The compression mechanism 110 then folds the filter media sheet 10 and compresses it into a cylindrical shape. The compression mechanism 110 is composed of, for example, a trumpet guide that compresses and bundles the filter media sheet 10 into a cylindrical shape.

[0043] Next, the filter media sheet 10, which has been compressed into a cylindrical shape by the compression mechanism 110, is sent to the first winding mechanism 120. Also, if necessary, the raw material of the crimped adsorbent sheet 20 is sent to the first winding mechanism 120. More specifically, the cylindrically compressed filter media sheet 10 is sent to the first winding mechanism 120 in a state where it is stacked on top of the adsorbent sheet 20. The first winding mechanism 120 then winds the adsorbent sheet 20 around the outer surface of the cylindrically compressed filter media sheet 10. This gives rise to a long first molded body 41 consisting of the raw material of the filter media sheet 10 and the raw material of the adsorbent sheet 20. The first winding mechanism 120 is composed of, for example, tongs that form the stacked filter media sheet 10 and adsorbent sheet 20 together into a cylindrical shape.

[0044] Next, the first molded body 41 obtained by the first hoisting mechanism 120 is fed to the second hoisting mechanism 130. Also, the raw material for the wrapper 30 is fed to the second hoisting mechanism 130. More specifically, the cylindrical first molded body 41 is fed to the second hoisting mechanism 130 with the wrapper 30 on top. The second hoisting mechanism 130 then wraps the wrapper 30 around the outer surface of the adsorbent sheet 20 on the first molded body 41. This gives rise to a long second molded body 42 consisting of the raw material for the filter material sheet 10, the raw material for the adsorbent sheet 20, and the raw material for the wrapper 30. At this point, before being fed to the second hoisting mechanism 130, or after passing through the second hoisting mechanism 130, an adhesive to bond the overlapping portion 35 is applied to the wrapper 30 by a coating mechanism (not shown).

[0045] Next, the second molded body 42 obtained by the second hoisting mechanism 130 is fed to the heater 140. The heater 140 dries the adhesive applied to the wrapper 30 and bonds one end 31 (see Figure 2) and the other end 32 (see Figure 2) of the wrapper 30. The second molded body 42 that has passed through the heater 140 is then cut to a predetermined length by the cutting mechanism 150. This yields the filter segment 1 shown in Figure 1.

[0046] As described above, the adsorbent sheet 20 contains a solid adsorbent internally, and therefore tends to have higher rigidity than the filter media sheet 10. For this reason, if the amount of adsorbent sheet 20 is large relative to the filter media sheet 10, the adsorbent sheet 20 tends to be difficult to handle. In contrast, in this embodiment, the width w1 of the filter media sheet 10 is at least one times the width w2 of the adsorbent sheet 20. This makes it easier to handle the adsorbent sheet 20 in the manufacture of the filter segment 1 compared to the case where the width w1 of the filter media sheet 10 is less than one times the width w2 of the adsorbent sheet 20. As a result, it becomes easier to mold the filter segment 1 into the desired shape, for example, a cylindrical shape. Note that the manufacturing method of the filter segment 1 described above is just one example and is not limited thereto. For example, the second hoisting mechanism 130 may be omitted. In this case, the wrapper 30 is also fed to the first hoisting mechanism 120 together with the adsorbent sheet 20. At this time, the adsorbent sheet 20 may be fed with the wrapper 30 stacked on top of it.

[0047] [Embodiment 2] Next, Embodiment 2 of the present disclosure will be described. The same reference numerals are used for components similar to those in Embodiment 1, and detailed explanations are omitted here. The filter segment 2 of Embodiment 2 differs from the filter segment 1 of Embodiment 1 in the arrangement of the adsorbent sheet 20 relative to the filter material sheet 10. Figure 5 shows an example of a cross-sectional view of the filter segment 2 according to Embodiment 2, cut in a plane perpendicular to the airflow direction.

[0048] The filter segment 2 according to Embodiment 2 comprises a filter material sheet 10, an adsorbent sheet 20, and a wrapper 30, similar to Embodiment 1. The filter segment 2 is used as a filter segment for non-combustible heated tobacco or combustible tobacco, which are examples of aerosol products. The filter segment 2 is an example of a filter segment for aerosol products, or a first filter segment in a filter segment for aerosol products. As shown in Figure 5, the adsorbent sheet 20 is arranged between folded and compressed filter material sheets 10.

[0049] Furthermore, in the filter segment 2, similar to Embodiment 1, the width w1 of the filter media sheet 10 (see Figure 3) is at least 1 times, preferably 1.5 times, and more preferably 2 times, the width w2 of the adsorbent sheet 20 (see Figure 3). This makes it easier to maintain the shape of the filter segment 2 in the desired shape, similar to Embodiment 1. More specifically, when the filter segment 2 is cylindrical, making the width w1 of the filter media sheet 10 at least 1 time, preferably 1.5 times, and more preferably 2 times, the circularity of the cross-sectional shape of the filter segment 2 becomes easier to maintain.

[0050] The cross-section of the filter segment 2 perpendicular to the airflow direction is divided into an inner region S1 located within half the radius from the center and an outer region S2 located outside the inner region S1. In Figure 5, the outer region S2 is shown by hatching. Preferably, 50% or more of the adsorbent sheet 20 is located in the outer region S2, and more preferably, 80% or more is located in the outer region S2. The ratio of the adsorbent sheet 20 located in the outer region S2 can be obtained, for example, by analyzing images taken of the cross-section or end face of the filter segment 2. More specifically, for example, the cross-section or end face of the filter segment 2 is imaged with a microscope to identify the filter material sheet 10 and the adsorbent sheet 20. Then, the ratio of the adsorbent sheet 20 located in the outer region S2 can be obtained by dividing the area of ​​the adsorbent sheet 20 located in the outer region S2 by the area of ​​the adsorbent sheet 20 located in the inner region S1.

[0051] When filter segment 2 is used with an aerosol product, the particulate components of the aerosol generated in the aerosol product tend to flow near the radial center of filter segment 2. In the filter segment 2 of this embodiment, more than 50% of the adsorbent sheet 20 is located in the outer region S2, which suppresses obstruction of aerosol passage by the adsorbent sheet 20. Furthermore, vapor components such as carbonyls contained in the aerosol generated in the aerosol product pass not only near the radial center of filter segment 2 but also in the outer region S2. As a result, even when more than 50% of the adsorbent sheet 20 is located in the outer region S2, a decrease in the adsorption efficiency of carbonyls by the adsorbent sheet 20 is unlikely to occur.

[0052] Here, as described above, the adsorbent sheet 20 tends to have higher rigidity than the filter material sheet 10. In the filter segment 2, it is preferable that the filter material sheet 10 is crimped in order to suppress the deformation of the filter material sheet 10 due to the rigidity of the adsorbent sheet 20, and to suppress the formation of pores between the filter material sheets 10 and between the adsorbent sheet 20 and the filter material sheet 10. Furthermore, it is preferable that the filter material sheet 10 is crimped more strongly than in the filter segment 1 of Embodiment 1, in which the adsorbent sheet 20 is arranged on the outer circumference of the filter material sheet 10. In the filter segment 2, unlike the filter segment 1, the adsorbent sheet 20 is randomly arranged between the filter material sheets 10. In this embodiment, by applying a stronger crimp to the filter material sheet 10 compared to the filter segment 1, the filter material sheet 10 functions to mitigate the rigidity of the adsorbent sheet 20, thereby maintaining the uniformity of the filter segment 2. As a result, the formation of particularly large pore areas in the filter segment 2 is suppressed, and variations in air permeability resistance are suppressed.

[0053] Next, the manufacturing method for the filter segment 2 will be described. When manufacturing the filter segment 2, the raw material of the filter media sheet 10, which has been crimped as needed, and the raw material of the adsorbent sheet 20, which has been crimped as needed, are stacked together and sent to the compression mechanism 110 (see Figure 4). The compression mechanism 110 then folds the filter media sheet 10 and the adsorbent sheet 20 together and compresses them into a cylindrical shape. As a result, the adsorbent sheet 20 is placed between the compressed filter media sheets 10.

[0054] Subsequently, similar to Embodiment 1, the wrapper 30 is wrapped around the outer circumference of the compressed filter material sheet 10 and the adsorbent sheet 20, and then cut to a predetermined length to obtain the filter segment 2 shown in Figure 5.

[0055] [Application to Aerosol Products] As described above, filter segments 1 and 2 are used as filter segments for non-combustion heated tobacco or combustion tobacco, which are examples of aerosol products. (Non-combustion heated tobacco 200) Figure 6 shows an example of the configuration of non-combustion heated tobacco 200. Non-combustion heated tobacco 200 is a rod-shaped non-combustion heated tobacco comprising a tobacco rod portion 210, a mouthpiece portion 220, and a tip paper 230 for winding them.

[0056] The mouthpiece portion 220 includes an intermediate segment 221 and a filter portion 222 containing a filter material. The intermediate segment 221 is located at the upstream end of the mouthpiece portion 220 and is, for example, a hollow segment. The intermediate segment 221 is sandwiched between the tobacco rod portion 210 and the filter portion 222 in the axial direction (also referred to as the "long axis direction") of the non-combustion heated tobacco 200, and openings Vf may be provided concentrically along the circumferential direction of the intermediate segment 221. The openings Vf provided in the intermediate segment 221 of the non-combustion heated tobacco 200 are usually holes that facilitate the inflow of outside air due to the user's inhalation, and this inflow of air can lower the temperature of the components and air flowing in from the tobacco rod portion 210.

[0057] The airflow resistance in the longitudinal direction per stick of the non-combustion heated tobacco 200 is not particularly limited, but from the standpoint of ease of smoking, it is usually 8 mmH ２ It is 0 or greater, and 10 mmH ２ Preferably, it should be 0 or greater, and 12 mmH ２ It is more preferable that it be 0 or greater. Also, typically 100 mmH ２ It is less than 0 and 80 mmH ２ Preferably, it should be 0 or less, and 60 mmH ２ It is more preferable that the value be 0 or less. The air permeability resistance is measured according to the ISO standard method (ISO 6565:2015), for example, using a filter air permeability resistance meter manufactured by Cerulean Chemical Industries. The air permeability resistance refers to the pressure difference between the first end face and the second end face when a predetermined airflow rate (17.5 cc / min) of air is flowed from one end face (first end face) to the other end face (second end face) without obstructing air permeation on the side of the non-combustion heated tobacco 200. The air permeability resistance of the filter segment is measured when no air permeation occurs on the side. The unit is generally mmH ２ Represented by O. It is known that the relationship between airflow resistance and the length of the non-combustion heated tobacco 200 is proportional in the length range that is normally implemented (length 5 mm to 200 mm), and if the length doubles, the airflow resistance of the non-combustion heated tobacco 200 doubles.

[0058] The length of the non-combustion heated tobacco 200 along its long axis is not particularly limited, but 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 bottom surface of the columnar body of the non-combustion heated tobacco 200 is not particularly limited, but 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.

[0059] The ratio of the lengths of the intermediate segment 221 and the filter section 222 (intermediate segment 221:filter section 222) in the longitudinal length of the non-combustion heated tobacco 200 is not particularly limited, but from the viewpoint of the amount of flavor delivered and an appropriate aerosol temperature, it is usually 0.60 to 1.40:0.60 to 1.40, preferably 0.80 to 1.20:0.80 to 1.20, more preferably 0.85 to 1.15:0.85 to 1.15, even more preferably 0.90 to 1.10:0.90 to 1.10, and particularly preferably 0.95 to 1.05:0.95 to 1.05. By setting the ratio of the lengths of the intermediate segment 221 and the filter section 222 within the above range, a balance can be achieved between the cooling effect, the effect of suppressing loss due to the adhesion of generated vapor and aerosol to the inner wall of the intermediate segment, and the filter's air volume and flavor adjustment function, resulting in a good flavor and flavor intensity. In particular, lengthening the intermediate segment 221 promotes the particulation of aerosols and other substances, resulting in a better flavor profile. However, if it is too long, substances passing through it will adhere to the inner wall.

[0060] (Mouthpiece section 220) The configuration of the mouthpiece section 220 is not particularly limited, as long as it includes an intermediate segment 221 and a filter section 222 containing a filter material, and is configured such that the intermediate segment 221 is sandwiched adjacent to the tobacco rod section 210 and the filter section 222 in the axial direction of the non-combustion heated tobacco 200. The filter section 222 and the intermediate segment 221 will be described in detail below.

[0061] (Filter section 222) The filter section 222 includes a first filter segment 240, a second filter segment 250, and a wrapper 260 that wraps them together. Here, the first filter segment 240 is composed of filter segment 1 of Embodiment 1 (see Figures 1 and 2) or filter segment 2 of Embodiment 2 (see Figure 5). That is, the first filter segment 240 includes a filter media sheet 10, an adsorbent sheet 20, and a wrapper 30. The filter media sheet 10 and the adsorbent sheet 20 of the first filter segment 240 (filter segments 1 and 2) may be crimped as described above.

[0062] The cross-sectional shape of the filter portion 222 in the circumferential direction is substantially circular. The diameter of the filter portion 222 can be appropriately changed according to the product size, and is usually 4.0 mm or more and 9.0 mm or less, preferably 4.5 mm or more and 8.5 mm or less, and more preferably 5.0 mm or more and 8.0 mm or less. When the cross-section is not circular, the above diameter is defined as the diameter of a circle having the same area as the cross-section of the filter portion. The axial length of the filter portion 222, that is, the total axial length of the first filter segment 240 and the second filter segment 250, can be appropriately changed according to the product size, and is usually 15 mm or more and 35 mm or less, preferably 17.5 mm or more and 32.5 mm or less, and more preferably 20.0 mm or more and 30.0 mm or less. The shapes and dimensions of the filter medium sheet 10 and adsorbent sheet 20 of the first filter segment 240, and the filter medium sheet 251 described below of the second filter segment 250 can be appropriately adjusted so that the shape and dimensions of the filter portion 222 fall within the above ranges.

[0063] The ventilation resistance of the filter portion 222 in the axial direction is not particularly limited, and is usually 0.1 mmH ２ O / mm or more and 3 mmH ２ O / mm or less, preferably 0.15 mmH ２ O / mm or more and 2.5 mmH ２ O / mm or less, more preferably 0.18 mmH ２ O / mm or more and 2.0 mmH ２ O / mm or less. Similar to the ventilation resistance of the non-combustion heating-type tobacco 200 described above, the ventilation resistance is measured in accordance with the ISO standard method (ISO 6565), for example, using a filter ventilation resistance tester manufactured by Cerulean.

[0064] (Second filter segment 250) The second filter segment 250 comprises a filter media sheet 251 containing cellulose and a wrapper 252 that covers the filter media sheet 251 in a cylindrical shape. The filter media sheet 251 and the wrapper 252 can be made of the same materials as the filter media sheet 10 and the wrapper 30 of the first filter segment 240 (filter segments 1 and 2), respectively.

[0065] The filter media sheet 251 is an example of another filter media sheet. Like the filter media sheet 10, the filter media sheet 251 is folded and compressed into a cylindrical shape. Examples of the filter media sheet 251 include a nonwoven fabric or paper made from natural cellulose or regenerated cellulose, and it is preferable to use a nonwoven fabric made from natural cellulose or regenerated cellulose.

[0066] It is preferable that the filter material sheet 251 is crimped. More specifically, it is preferable that the filter material sheet 251 is crimped more strongly than the filter material sheet 10 and adsorbent sheet 20 of the first filter segment 240 (filter segments 1 and 2). By crimping the filter material sheet 251 strongly, the filter material sheet 251 is more easily compressed densely in the second filter segment 250, and gaps are less likely to form between the filter material sheets 251. As shown in Figure 6, the second filter segment 250 is provided at the end in the longitudinal direction in the non-combustion heated tobacco 200, so the filter material sheet 251 is exposed to the outside. By making it less likely for gaps to form between the filter material sheets 251, the appearance of the second filter segment 250 is improved.

[0067] The second filter segment 250 preferably has a higher airflow resistance than the first filter segment 240. The airflow resistance of the second filter segment 250 is not particularly limited, but is usually 0.1 mmH. ２ O / mm or more 3mmH ２ It is 0 / mm or less, and 0.15 mmH ２ 0 / mm or more, 2.5mmH ２ Preferably, it is 0 / mm or less, and 0.18 mmH ２ 0 / mm or more, 2.0mmH ２It is more preferable that the ratio be 0 / mm or less.

[0068] (Intermediate Segment 221) The intermediate segment 221 is sandwiched adjacent to the tobacco rod portion 210 and the first filter segment 240 of the filter portion 222, and is a rod-shaped member that is usually provided with a cavity in which the circumferential cross-section, such as a cylinder, is hollow. The length of the intermediate segment 221 in the longitudinal direction can be appropriately changed according to the size of the product, but is usually 15 mm or more, preferably 20 mm or more, and more preferably 25 mm or more. Also, the length of the intermediate segment 221 in the longitudinal direction is usually 40 mm or less, preferably 35 mm or less, and more preferably 30 mm or less. By setting the length of the intermediate segment 221 in the longitudinal direction to be above the lower limit above, sufficient cooling effect can be ensured and good flavor can be obtained. Also, by setting the length of the intermediate segment 221 in the longitudinal direction to be below the upper limit above, loss can be suppressed as the generated vapor and aerosol adhere to the inner wall of the intermediate segment.

[0069] As shown in Figure 6, the intermediate segment 221 is provided with openings Vf concentrically in its circumferential direction. The number of openings Vf is not particularly limited, but for example, eight can be cited. The openings Vf in the intermediate segment 221 are located in a region of 4 mm or more in the direction toward the intermediate segment 221 from the boundary between the intermediate segment 221 and the filter section 222. The presence of the openings Vf allows air to flow into the cooling section from the outside during use, lowering the temperature of the components and air flowing in from the tobacco rod section 210. Furthermore, by positioning the intermediate segment within a region of 4 mm or more in the direction toward the intermediate segment 221 from the boundary between the intermediate segment 221 and the filter section 222, not only is the cooling capacity improved, but the retention of components generated by heating within the intermediate segment 221 is suppressed, and the amount of these components delivered can be improved. Furthermore, when an aerosol base material is used in the tobacco rod portion 210, the vapor containing the aerosol base material and tobacco flavor components, which is generated when the tobacco rod portion 210 is heated, can be brought into contact with outside air, causing its temperature to drop and liquefy, thereby promoting the generation of aerosols.

[0070] (Tobacco Rod Section 210) The tobacco rod section 210 is not particularly limited as long as it is a known embodiment, but it is usually constructed by wrapping tobacco filler 310 with rolling paper 320. The size of the tobacco filler 310 and the method of preparing it are not limited. As the tobacco filler 310, dried tobacco leaves may be cut, or dried tobacco leaves may be crushed, homogenized, and processed into a sheet. Here, we will explain using the case where shredded tobacco is used as the tobacco filler 310 as an example. The material of the shredded tobacco is not particularly limited, and known materials such as laminas and backbones can be used. Alternatively, dried tobacco leaves may be crushed to an average particle size of 20 μm or more and 200 μm or less to make crushed tobacco, which may then be homogenized and processed into a sheet (hereinafter simply referred to as a homogenized sheet), and then cut. Furthermore, a so-called strand type may be used, in which a homogenized sheet having a length approximately the same as the longitudinal direction of the tobacco rod section 210 is cut approximately horizontally to the longitudinal direction of the tobacco rod section 210 and filled into the tobacco rod section 210. Furthermore, the width of the tobacco strips is preferably 0.5 mm to 2.0 mm when filling the tobacco rod portion 210.

[0071] The tobacco filler 310 may contain an aerosol base material that generates aerosol smoke. The type of aerosol base material is not particularly limited, and various extracts from natural products 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 310 is not particularly limited, but from the viewpoint of generating 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 310. The tobacco filler 310 may also contain a flavoring. The above tobacco filler 310 is rolled up with rolling paper 320 so that it is on the inside to form a tobacco rod portion 210.

[0072] In addition to the embodiments described above, the non-combustion heated tobacco 200 may have a tip segment on the upstream side of the tobacco rod portion 210. The tip segment is made by placing paper, nonwoven fabric, or acetate fibers inside and forming it into a rod shape with a wrapper. Alternatively, the non-combustion heated tobacco 200 may have an aerosol base material rod portion that does not contain tobacco filler 310 instead of the tobacco rod portion 210. The aerosol base material rod portion is made by impregnating or coating a filler material such as paper with an aerosol base material and wrapping it with rolling paper instead of tobacco filler 310.

[0073] (Combustible cigarette 400) Figure 7 shows an example of the configuration of a combustible cigarette 400. The combustible cigarette 400 is a stick-shaped combustible cigarette comprising a tobacco rod portion 410, a filter portion 420, and a tip paper 430 for rolling them together. The tobacco rod portion 410 is usually constructed by rolling a tobacco filler 411 with a rolling paper 412, similar to the tobacco rod portion 210.

[0074] The filter section 420 includes a first filter segment 421, a second filter segment 422, and a wrapper 423 that wraps around them. Here, the first filter segment 421 is composed of filter segment 1 of Embodiment 1 (see Figures 1 and 2) or filter segment 2 of Embodiment 2 (see Figure 5). That is, the first filter segment 421 includes a filter material sheet 10, an adsorbent sheet 20, and a wrapper 30. The axial airflow resistance of the filter section 420 is not particularly limited, but is usually 0.5 mmH ２ 0 / mm or more, 5mmH ２ It is 0 / mm or less, and 1.0 mmH ２ 0 / mm or more, 4.0mmH ２ Preferably, it should be 0 / mm or less, and 1.8 mmH ２ 0 / mm or more, 3.0mmH ２ It is more preferable that the ratio be 0 / mm or less.

[0075] The second filter segment 422 comprises a cellulose-containing filter material sheet 424 and a wrapper 425 that covers the filter material sheet 424 in a cylindrical shape. The filter material sheet 424 and the wrapper 425 can be made of the same materials as the filter material sheet 10 and wrapper 30 of the first filter segment 421 (filter segments 1 and 2), respectively. The wrapper 425 may also have openings Vf concentrically along the circumferential direction of the second filter segment 422. The provision of openings Vf promotes the inflow of air into the filter section 420 by suction during use.

[0076] Next, the present disclosure will be described in more detail using examples. However, the present disclosure is not limited to the following examples. A filter comprising a first filter segment 240 and a second filter segment 250 was fabricated, and the adsorption performance of crotonaldehyde, the target of adsorption by the adsorbent sheet 20, was evaluated.

[0077] [Example 1] (Preparation of the first filter segment 240) The first filter segment 240 was prepared in the same manner as the filter segment 1 of Embodiment 1, in which the adsorbent sheet 20 was arranged on the outer circumference of the filter media sheet 10. As the filter media sheet 10, a nonwoven fabric made of cellulose with a thickness of 500 μm, a basis weight of 50 gsm, and a width w1 of 130 mm was used. As the adsorbent sheet 20, a nonwoven fabric made of cellulose with a thickness of 250 μm, a basis weight of 70 gsm, and a width w2 of 30 mm, in which activated carbon, a solid adsorbent, was added internally was used. The activated carbon content in the adsorbent sheet 20 was 42 gsm. As the wrapper 30, a material with a thickness of 32 μm and a basis weight of 24 gsm was used.

[0078] The filter media sheet 10 was compressed into a cylindrical shape, the adsorbent sheet 20 and wrapper 30 were wrapped around the outer circumference of the filter media sheet 10, bonded with adhesive, and then cut to a length of 12 mm to obtain the first filter segment 240. The air permeability resistance of the first filter segment 240 was 29 mmH ２ The result was O, and the amount of activated carbon contained in the first filter segment 240 was 15 mg.

[0079] (Preparation of the second filter segment 250) A nonwoven fabric made of cellulose with a thickness of 500 μm, a basis weight of 50 gsm, and a width of 150 mm was used as the filter media sheet 251. The material of the filter media sheet 251 is the same as that of the filter media sheet 10 of the first filter segment 240. In addition, a wrapper 252 with a thickness of 32 μm and a basis weight of 24 gsm was used. The filter media sheet 251 was compressed into a cylindrical shape, the wrapper 252 was wrapped around the outer circumference of the filter media sheet 251, bonded with adhesive, and then cut to a length of 15 mm to obtain the second filter segment 250. The air permeability resistance of the second filter segment 250 was 39 mmH ２ It was O.

[0080] (Filter Fabrication) The obtained first filter segment 240 and second filter segment 250 were arranged axially, their outer circumferences were wrapped with a wrapper 260, and they were bonded together with adhesive to obtain a filter. The wrapper 260 used had a thickness of 48 μm and a basis weight of 26.5 gsm. The total length of the filter was 27 mm, and the airflow resistance of the entire filter was 68 mmH ２ The result was O. The filter diameter was 7 mm.

[0081] [Example 2] A filter was obtained in the same manner as in Example 1, except that the width w2 of the adsorbent sheet 20 used in the first filter segment 240 was set to 60 mm. The air permeability resistance of the first filter segment 240 was 41 mmH ２ The amount of activated carbon contained in the first filter segment 240 was 30 mg. The airflow resistance of the entire filter was 80 mmH ２ It was O.

[0082] [Example 3] A first filter segment 240 was fabricated in the same manner as the filter segment 2 of Embodiment 2, in which the adsorbent sheet 20 was placed between cylindrically compressed filter media sheets 10. The filter media sheets 10 and wrapper 30 were the same as those used in Embodiment 1. The adsorbent sheet 20 was the same as those used in Embodiment 1, except that its width w2 was 23 mm.

[0083] The filter media sheet 10 and the adsorbent sheet 20 were compressed together into a cylindrical shape, a wrapper 30 was wrapped around the outer circumference, and after being bonded with adhesive, they were cut to a length of 12 mm to obtain a first filter segment 240 in which the adsorbent sheet 20 was placed between the filter media sheets 10. The airflow resistance of the first filter segment 240 was 21 mmH ２ The result was O, and the amount of activated carbon contained in the first filter segment 240 was 12 mg.

[0084] Next, in the same manner as in Example 1, the first filter segment 240 and the second filter segment 250 were wrapped with a wrapper 260 and bonded together with adhesive to obtain a filter. The airflow resistance of the entire filter was 60 mmH ２ It was O.

[0085] [Comparative Example 1] A second filter segment 250 was used as the filter, having a cylindrical compressed filter media sheet 251 and a wrapper 252 wrapped around the outer circumference of the filter media sheet 251. The same filter media sheet 251 and wrapper 252 were used as in Example 1. The total length of the filter, i.e., the length of the second filter segment 250, was 27 mm, and the airflow resistance of the entire filter, i.e., the second filter segment 250, was 70 mmH ２ It was O.

[0086] [Comparative Example 2] A first filter segment 240 was prepared in the same manner as in Example 1, except that a cylindrical cellulose acetate tow with activated carbon added between the fibers was used instead of the filter sheet 10 and the adsorbent sheet 20. The air permeability resistance of the first filter segment 240 was 35 mmH ２ The amount of activated carbon contained in the first filter segment 240 was 30 mg. The second filter segment 250 was prepared in the same manner as in Example 1, except that a cylindrical cellulose acetate tow was used instead of the filter sheet 251. The air permeability resistance of the second filter segment 250 was 40 mmH ２ It was O.

[0087] Next, in the same manner as in Example 1, the first filter segment 240 and the second filter segment 250 were wrapped with the wrapper 260 and bonded together with adhesive to obtain a filter. The airflow resistance of the entire filter was 75 mmH ２ It was O.

[0088] [Evaluation] The amount of crotonaldehyde, an example of carbonyl compounds that are adsorbed by the adsorbent sheet 20, was measured for the filters obtained in Examples 1 to 3 and Comparative Examples 1 and 2. The amount of crotonaldehyde permeate was measured by the following method: (1) A sample was prepared by connecting the fabricated filter and a standard tobacco rod with a tip paper. (2) The prepared sample was conditioned under harmonized conditions in accordance with ISO 3402:2023. (3) The conditioned sample was automatically smoked using an automatic smoking machine in accordance with ISO 3308:2012, and the mainstream smoke was collected. The collected mainstream smoke was then analyzed, and the amount of each component per sample was calculated to obtain the amount of crotonaldehyde permeate. Specifically, the analysis was performed in accordance with ISO 21160:2018.

[0089] Figure 8 shows the measurement results of the crotonaldehyde permeation rate using the filters of Examples 1 to 3, and Comparative Examples 1 and 2. The vertical axis of Figure 8 represents the crotonaldehyde permeation rate, and the horizontal axis represents the activated carbon content in the filter. In Figure 8, the values ​​are shown when the crotonaldehyde permeation rate in the filter of Comparative Example 1, which does not contain activated carbon, is normalized to 1.

[0090] As shown in Figure 8, the filters of Examples 1 to 3 had less crotonaldehyde permeated through them compared to the filter of Comparative Example 1. This confirmed that the first filter segment 240, comprising a filter material sheet 10 containing cellulose and an adsorbent sheet 20 containing activated carbon, a solid adsorbent, has the adsorption performance to adsorb crotonaldehyde, the target substance. Furthermore, it was confirmed that the first filter segment 240 has the adsorption performance to adsorb crotonaldehyde in all of Examples 1 and 2, which correspond to filter segment 1 of Embodiment 1, and in Example 3, which corresponds to filter segment 2 of Embodiment 2.

[0091] Generally, the amount of adsorbed substance by a filter is proportional to the amount of adsorbent contained in the filter. As a result, the amount of adsorbed substance that permeates through the filter decreases in proportion to the increase in the amount of adsorbent contained in the filter. In Figure 8, comparing Example 2 and Comparative Example 2, which have similar amounts of activated carbon in their filters, Example 2 shows a smaller permeation rate of crotonaldehyde. This confirms that by providing the first filter segment 240 with an adsorbent sheet 20 containing activated carbon, a solid adsorbent, the adsorption performance of crotonaldehyde is improved compared to the case where activated carbon is externally added between the fibers of cellulose acetate tow.

[0092] While embodiments of this disclosure have been described above, this disclosure is not limited to the embodiments described above. Various modifications and combinations are permitted as long as they do not contradict the spirit of this disclosure. In addition, as an embodiment other than those of this disclosure, a cellulose acetate tow may be used instead of a filter media sheet containing cellulose. In this case, the filter media sheet in the embodiments described above may be read as the tow band of the cellulose acetate tow, and the width of the filter media sheet may be read as the width of the tow band of the cellulose acetate tow after fiber opening.

[0093] <Summary> This disclosure includes the following configurations: (1) A filter segment for aerosol products comprising a filter material sheet containing cellulose, an adsorbent sheet containing a solid adsorbent, and a wrapper that covers the filter material sheet and the adsorbent sheet together in a cylindrical shape, wherein the width of the filter material sheet is 1 or more times the width of the adsorbent sheet. (2) The filter segment for aerosol products according to (1), wherein the filter material sheet and the adsorbent sheet are crimped, and the filter material sheet is crimped more strongly than the adsorbent sheet. (3) The filter segment for aerosol products according to (1) or (2), wherein the filter material sheet and the adsorbent sheet do not contain plasticizers. (4) The filter segment for aerosol products according to any one of (1) to (3), wherein the adsorbent sheet does not contain a binder. (5) The filter segment for aerosol products according to any one of (1) to (4), wherein the adsorbent content in the adsorbent sheet is in the range of 1 mg to 30 mg. (6) The aerosol product filter segment according to any one of (1) to (5), wherein the adsorbent sheet is arranged on the outer circumference of the folded and compressed filter material sheet, and the ends of the adsorbent sheet do not overlap in the circumferential direction. (7) The aerosol product filter segment according to (6), wherein at least a portion of the adsorbent sheet is adhered to the wrapper. (8) The aerosol product filter segment according to (6) or (7), wherein the adsorbent sheet has different surface roughness on its front and back sides, and the side with the greater surface roughness is arranged on the inner circumference side. (9) The aerosol product filter segment according to any one of (1) to (5), wherein the adsorbent sheet is arranged between the folded and compressed filter material sheets. (10) When the cross section cut in the axial direction is divided into an inner region located within the range of half the radius from the center and an outer region located outside the inner region, the adsorbent sheet is such that 50% or more is located in the outer region, as described in (9).(11) A filter segment for aerosol products according to any one of (1) to (10), comprising: a first filter segment including the filter material sheet, the adsorbent sheet, and the wrapper; and a second filter segment connected to one end of the first filter segment, including another filter material sheet containing cellulose, and having a greater air permeability resistance than the first filter segment. (12) A filter segment for aerosol products according to (11), wherein the filter material sheet and the adsorbent sheet of the first filter segment and the other filter material sheet of the second filter segment are crimped, and the other filter material sheet of the second filter segment is crimped more strongly than the filter material sheet and the adsorbent sheet of the first filter segment. (13) An aerosol product comprising: a base material including an aerosol source; and a filter segment for aerosol products according to any one of (1) to (12), located downstream of the base material.

[0094] 1, 2... Filter segment, 10... Filter sheet, 20... Adsorbent sheet, 30... Wrapper, 200... Non-combustion heated tobacco, 400... Combustion tobacco

Claims

1. A filter segment for aerosol products comprising a filter media sheet containing cellulose, an adsorbent sheet containing a solid adsorbent, and a wrapper that covers the filter media sheet and the adsorbent sheet together in a cylindrical shape, wherein the width of the filter media sheet is at least one times the width of the adsorbent sheet.

2. The filter segment for aerosol products according to claim 1, wherein the filter material sheet and the adsorbent sheet are crimped, and the filter material sheet is crimped more strongly than the adsorbent sheet.

3. The filter segment for aerosol products according to claim 1 or 2, wherein the filter material sheet and the adsorbent sheet do not contain plasticizers.

4. The adsorbent sheet is a filter segment for aerosol products according to any one of claims 1 to 3, wherein the adsorbent sheet does not contain a binder.

5. The filter segment for aerosol products according to any one of claims 1 to 4, wherein the adsorbent content in the adsorbent sheet is in the range of 1 mg to 30 mg.

6. The aerosol product filter segment according to any one of claims 1 to 5, wherein the adsorbent sheet is arranged on the outer circumference of the folded and compressed filter sheet, and the ends of the adsorbent sheet do not overlap in the circumferential direction.

7. The aerosol product filter segment according to claim 6, wherein at least a portion of the adsorbent sheet is adhered to the wrapper.

8. The adsorbent sheet has different surface roughness on its front and back sides, and is arranged with the side with the greater surface roughness facing the inner circumference, as described in claim 6 or 7.

9. The aerosol product filter segment according to any one of claims 1 to 5, wherein the adsorbent sheet is placed between the folded and compressed filter sheets.

10. When the cross section cut in the axial direction is divided into an inner region located within the range of half the radius from the center and an outer region located outside the inner region, the adsorbent sheet is configured such that 50% or more is located in the outer region, as described in claim 9.

11. A filter segment for aerosol products according to any one of claims 1 to 10, comprising: a first filter segment including the filter material sheet, the adsorbent sheet, and the wrapper; and a second filter segment connected to one end of the first filter segment, including another filter material sheet containing cellulose, and having a greater air permeability resistance than the first filter segment.

12. The filter segment for aerosol products according to claim 11, wherein the filter material sheet and the adsorbent sheet of the first filter segment and the other filter material sheet of the second filter segment are crimped, and the other filter material sheet of the second filter segment is crimped more strongly than the filter material sheet and the adsorbent sheet of the first filter segment.

13. An aerosol product comprising a substrate portion containing an aerosol source, and a filter segment for aerosol products according to any one of claims 1 to 12, located downstream of the substrate portion.

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