Paper filter rod and flavoured inhalation articles

Abstract

This disclosure provides a paper filter rod comprising: a filling material and an inner filter rod forming paper surrounding the filling material, wherein the average area of ​​the pores formed in a cross-section perpendicular to the long axis is less than 0.15 mm. 2 The hardness in the direction perpendicular to the long axis, as defined in formula (1), is greater than 75% and satisfies formula (2). Hardness (%) in the direction perpendicular to the long axis = (Dd / Ds) × 100 (1) Pressure drop per 1 mm length in the long axis direction / filling density of the filler material < 22 mmH2O × mm 2 / mg (2)

Description

Technical Field

[0001] This disclosure relates to a paper filter rod and a flavored inhalation product. Background Technology

[0002] Paper filters, obtained by wrapping a filling material, such as paper (pure pulp), with filter rod forming paper, are used as filters for flavor inhalation products, instead of cellulose acetate filters obtained by processing synthetic fibers such as cellulose acetate tows into rod shapes. For example, PTL 1 discloses a paper filter for flavor inhalation products.

[0003] Paper filters need to have optimal airflow resistance and sufficient rigidity, while also ensuring that the channels (holes) within them are not visually noticeable. To ensure a favorable appearance and rigidity for paper filters, it is possible to apply curling or increase the amount of paper packing, but with existing methods, airflow resistance may increase beyond the desired range.

[0004] Citation List

[0005] Patent documents

[0006] PTL 1: WO 2022 / 230408 ​​A1 Summary of the Invention

[0007] The problem to be solved by the present invention

[0008] This disclosure provides a paper filter rod having airflow resistance and sufficient rigidity within a predetermined range, while also having a desired appearance, and also provides a flavor inhalation article including the paper filter rod.

[0009] Solution to the problem

[0010] One aspect of this disclosure is a paper filter rod comprising: a filling material and an inner filter rod forming paper surrounding the filling material, wherein the average area of ​​the pores formed in a cross-section perpendicular to the long axis is less than 0.15 mm. 2 The hardness defined in formula (1) is greater than 75% in the direction perpendicular to the long axis and satisfies formula (2).

[0011] Hardness (%) in the direction perpendicular to the long axis = (Dd / Ds) × 100 (1)

[0012] Pressure drop / filling density of filler material per 1 mm length along the long axis < 22 mmH2O×mm 2 / mg (2)

[0013] (In formula (1):

[0014] Ds (mm) is the diameter of the cross-section in the direction perpendicular to the long axis of the paper filter rod before the load F is applied.

[0015] Dd (mm) is the diameter of the cross-section in the direction perpendicular to the long axis of the paper filter rod when the load F is applied, and

[0016] The load F is the load applied to the paper filter rod under the conditions of a 3 N compressive load in the direction perpendicular to the long axis of the paper filter rod, a φ12 mm pressure clamp head diameter, and a compression time of 10 seconds.

[0017] In a first aspect, the paper filter rod has a stiffness greater than 75% in the direction perpendicular to its long axis and uses high-porosity paper as the filling material. The paper filter rod filled with high-porosity paper has inconspicuous channels and also has the desired airflow resistance. Therefore, the first aspect makes it possible to provide a paper filter rod that has airflow resistance within a predetermined range and sufficient stiffness, while also having the desired appearance.

[0018] The second aspect of this disclosure, based on the first aspect, is a paper filter rod wherein the filling material is formed of one or more rolled sheets, and the porosity of the sheets is greater than 15,000 CORESTA units.

[0019] In the second aspect, high-porosity paper with an airflow resistance of at least 15,000 CORESTA units is used as the filling material for the paper filter rod. Therefore, this second aspect enables the provision of paper filter rods that can appropriately exhibit the advantages of high-porosity paper.

[0020] The third aspect of this disclosure, based on the first and second aspects, is a paper filter rod wherein the sheet has a curling depth of 0.4 mm or greater.

[0021] In a third aspect, a curling depth of 0.4 mm or greater is applied to the sheet of filling material forming the paper filter rod. The desired airflow resistance and stiffness are ensured in the paper filter rod filled with a filling material formed from high-porosity paper to which a curling depth of 0.4 mm or greater has been applied. Therefore, this third aspect makes it possible to provide a paper filter rod that ensures the desired airflow resistance and stiffness.

[0022] The fourth aspect of this disclosure, based on the first to third aspects, is a paper filter rod, wherein the basis weight of the sheet is 15 g / m³. 2 -40 g / m 2 .

[0023] Fourthly, the high-porosity paper sheet used as the filling material for paper filter rods has a porosity of 15 g / m³. 2 -40 g / m2 The basis weight. The desired appearance is ensured in the paper filter rod filled with this filling material. Therefore, the fourth aspect makes it possible to provide a paper filter rod that ensures the desired appearance.

[0024] The fifth aspect of this disclosure, which is based on any one of the first to fourth aspects, is a paper filter rod, wherein the sheet has a porosity greater than 7,000 CORESTA units before being rolled.

[0025] In a fifth aspect, the sheet of filling material forming the paper filter rod has a porosity greater than 7000 CORESTA units before being rolled. The paper filter rod filled with a filling material produced by rolling such high-porosity paper has inconspicuous channels and desired airflow resistance. Therefore, the fifth aspect makes it possible to provide a paper filter rod that has airflow resistance within a predetermined range while also having a desired appearance.

[0026] The sixth aspect of this disclosure is a flavored inhalation article comprising: a paper filter rod as disclosed in the first to fifth aspects, the paper filter rod serving as a first filter rod; a second filter rod containing a flavor source; and a tipping paper wrapped around the first and second filter rods.

[0027] In a sixth aspect, a flavor inhalation article is configured to include: a paper filter rod filled with a filling material made of high-porosity paper and having a stiffness greater than 75% in a direction perpendicular to its long axis; a second filter rod containing a flavor source; and a tipping paper wrapped around the first and second filter rods. Therefore, the sixth aspect enables the production of a flavor inhalation article having airflow resistance within a predetermined range and sufficient stiffness, while also possessing a desired appearance.

[0028] The seventh aspect of this disclosure, based on the sixth aspect, is a flavored inhalation article in which a paper filter rod is disposed on the upstream side of a second filter rod.

[0029] In a seventh aspect, a paper filter rod serving as a first filter rod is disposed upstream of a second filter rod inside the flavor inhalation article. This second filter rod contains a flavor source, and when the user inhales, air flows from upstream through the flavor source to downstream. According to the seventh aspect, leakage of vapors or aerosols generated by the flavor source to the upstream side of the flavor inhalation article can be suppressed by means of the paper filter rod. Attached Figure Description

[0030] [ Figure 1 [Illustration] is an overall perspective view of the filter rod according to an embodiment.

[0031] [ Figure 2 ] is along Figure 1Arrow AA in the image shows a cross-sectional view of the filter rod.

[0032] [ Figure 3 [Illustration] is a schematic diagram showing a rolled-up piece of paper.

[0033] [ Figure 4A [This is a schematic diagram of the ventilation structure in a filter rod made of ordinary paper.]

[0034] [ Figure 4B [Image] is a diagram showing the appearance of a filter rod made from paper sheets produced from ordinary paper.

[0035] [ Figure 5A [This is a schematic diagram of the ventilation structure in a filter rod made of paper produced from high-porosity paper.]

[0036] [ Figure 5B [Image] is a diagram showing the appearance of a filter rod made from paper sheets produced with high porosity.

[0037] [ Figure 6 [This is a graph showing the relationship between the packing density of a filter bar and the airflow resistance in the ventilation direction for filter bars produced using high-porosity paper or ordinary paper as the base roll.]

[0038] [ Figure 7A [This is a graph showing the distribution of channels of different areas in a total cross-section perpendicular to the longitudinal direction for a filter rod filled with a sheet of paper using curled ordinary paper as the base.]

[0039] [ Figure 7B [This is a graph showing the distribution of channels of different areas in the overall cross-section perpendicular to the longitudinal direction for a filter rod filled with a sheet of paper using curled high-porosity paper as the base roll.]

[0040] [ Figure 8 [ ] is a graph showing the research results on the relationship between average channel area and curling depth.

[0041] [ Figure 9 [This indicates the exclusion] Figure 6 The sample with an undesirable appearance, included in the oval shape at the bottom, was subsequently... Figure 6 A graph of the obtained data.

[0042] [ Figure 10 [This is for] Figure 9 For each sample, plot the slope (vertical axis value / horizontal axis value) along the vertical axis and plot the hardness (%) of each sample along the horizontal axis.

[0043] [ Figure 11 The graph shows the porosity of the example and comparative examples 1-3 after a 0.5 mm curling treatment.

[0044] [ Figure 12 [Image] is a side cross-sectional schematic diagram showing an example of a flavor inhalation product using a paper filter.

[0045] [ Figure 13 [Illustration] is a side cross-sectional view showing another example of a flavor inhalation product using a paper filter rod obtained by cutting the filter rod in the longitudinal direction.

[0046] [ Figure 14 [Illustration] is a schematic diagram illustrating a method for measuring the hardness of a filter rod. Detailed Implementation

[0047] Embodiments of this disclosure will be described below with reference to the accompanying drawings. In the drawings described below, the same or corresponding parts are assigned the same reference numerals, and repeated descriptions will not be given.

[0048] Figure 1 This is an overall perspective view of the filter rod 10 according to an embodiment. Figure 2 It is along Figure 1 Arrow AA shows a cross-sectional view of filter rod 10.

[0049] The filter rod 10 is made of paper filter material that forms part of the flavor inhalation article. The paper filter (paper filter rod 20, which will be described later) can be obtained by cutting the filter rod 10 to have a predetermined length in the longitudinal direction.

[0050] like Figure 1 As shown, the filter rod 10 is cylindrical and includes a paper sheet 12 and a first filter rod forming paper 14 wrapped around the paper sheet 12. The paper sheet 12 is a sheet formed by cutting a predetermined cellulose-containing base roll to a predetermined length and performing a suitable curling process, then folding the curled sheet and housing it within the first filter rod forming paper 14, which has been wound into a cylindrical shape. It should be noted that the paper sheet 12 may also be wound rather than folded before being housed within the first filter rod forming paper 14. The paper sheet 12 is an example of the filler material of this disclosure. The first filter rod forming paper 14 is an example of the inner filter rod forming paper of this disclosure.

[0051] For example, the material of the first filter rod forming paper 14 can contain pulp as a major component. The pulp sheet can be formed using wood pulp (such as softwood pulp or hardwood pulp), or produced using a mixture of non-wood pulps (such as linseed pulp, hemp pulp, sisal pulp, or Spanish grass) typically used in wrapping paper for tobacco products. These pulps can be used alone, or several types of pulp can be used in combination in any proportion. The material may also include fillers such as calcium carbonate.

[0052] There are no particular limitations on the form of the first filter rod forming paper 14, and it may include seams comprising one or more adhesive lines. The adhesive may include a hot-melt adhesive, and further, the hot-melt adhesive may include polyvinyl alcohol. Additionally, the adhesive may include a vinyl acetate-based adhesive. There are no particular limitations on the material of the first filter rod forming paper 14, and known materials may be used, and it may also include fillers such as calcium carbonate. Furthermore, the first filter rod forming paper 14 may be coated or uncoated, but from the perspective of allowing the imparting of functions other than strength and structural stiffness, it is preferably coated with the desired material. Furthermore, the first filter rod forming paper 14 may be a breathable porous paper with multiple pores.

[0053] As an example, in the following text, it will be assumed that the length of the cut base roll (i.e., the longitudinal length of the filter rod 10) is 120 mm, and the circumference of the filter rod 10 is 21.4 mm. Assuming π = 3.14, the radius of the filter rod 10 is therefore:

[0054] 21.4 mm / (3.14 × 2) = 3.40764 (approximately as follows)

[0055] ≈ 3.41mm.

[0056] Furthermore, in the longitudinal direction perpendicular to the filter rod 10 ( Figure 2 The cross-sectional area of ​​the surface shown is:

[0057] 21.4 mm × 3.41 mm / 2 = 36.487 mm 2 .

[0058] In addition, the volume of filter rod 10 is:

[0059] 120 mm × 36.487 mm 2 = 4378.44 mm 3

[0060] ≈ 4378 mm 3 .

[0061] The curl depth will be described here. Figure 3 This is a schematic diagram showing the already curled paper piece 12.

[0062] like Figure 3 As shown, when the flat paper sheet 12 is rolled, a mountain portion 12a and a valley portion 12b are formed. The difference h between the maximum height of the mountain portion 12a and the maximum depth of the valley portion 12b of the paper sheet 12 is called the roll depth of the paper sheet 12. As an example, the roll depth is established based on the setting of the engagement depth (engagement amount) of a pair of rollers used to perform the roll-up process on the flat paper sheet 12 (or its base roll).

[0063] In addition, the inventors of this disclosure conducted various measurements on high-porosity paper and ordinary paper with lower porosity, and discovered the following differences between ordinary paper and high-porosity paper. Figure 4A This is a schematic diagram of the ventilation structure in the filter rod 10 of the paper sheet 12 made of ordinary paper. Figure 4B This is a diagram showing the appearance of the filter rod 10, which uses a sheet of paper 12 made from ordinary paper. Figure 5A This is a schematic diagram of the ventilation structure in the filter rod 10 of the paper sheet 12 made of high porosity paper. Figure 5B This is a diagram showing the appearance of a filter rod 10 made of a sheet of paper 12 produced from high-porosity paper.

[0064] Figure 4A and Figure 5B The bending of the paper sheet 12 schematically illustrates the curling process applied to the paper sheet 12. For example... Figure 4A As schematically shown, in a filter rod 10 using a sheet of paper 12 made of ordinary paper, air is considered to pass through a passage structure formed inside the sheet of paper 12 filling the filter rod 10 in the longitudinal direction. Figure 4A and Figure 5A This is illustrative because the mountain and valley structures created by curling are shaped to follow the width direction of the paper sheet 12, as shown below. Figure 3 As shown. Figure 4A The large arrows in the diagram schematically show the airflow path through the passage structure formed inside the filling paper sheet 12. Meanwhile, the filter rod 10 of the paper sheet 12, made from ordinary paper, has a low porosity, thus the airflow in the direction perpendicular to the airflow path is considered small. Figure 4A The small arrows in the diagram schematically illustrate the airflow in a direction perpendicular to the passage structure.

[0065] On the other hand, such as Figure 5A As schematically shown, in a filter rod 10 employing a sheet 12 made of high-porosity paper, airflow in a direction perpendicular to the longitudinal direction of the sheet 12 filling the filter rod 10 is considered to primarily facilitate airflow in the longitudinal direction of the filter rod 10. This is because air can easily flow in the direction of the sheet 12 made of high-porosity paper with high porosity. Figure 5A The large arrows in the diagram schematically indicate airflow in a direction perpendicular to the paper sheet 12. Meanwhile, in the filter rod 10 of the paper sheet 12, which is made of high-porosity paper, it is assumed that no airflow is formed as described above. Figure 4A The large-path structure shown. Figure 5A The small arrows in the diagram schematically show the airflow path along the passage structure.

[0066] The inventors conducted further measurements on high-porosity paper and ordinary paper to study the conditions of the filter rod 10, which has the desired airflow resistance and appearance while ensuring rigidity.

[0067] Figure 6 This is a graph showing the relationship between the packing density of the filter rod 10 and the airflow resistance in the ventilation direction (per 120 mm length) for a filter rod 10 produced using high-porosity paper or ordinary paper as the base roll of the sheet 12. Figure 7A It is a graph showing the distribution of channels of different areas in the overall cross section perpendicular to the longitudinal direction for a filter rod 10 filled with a sheet of paper 12 using curled ordinary paper as the base roll. Figure 7B It is a graph showing the distribution of channels of different areas in the overall cross section perpendicular to the longitudinal direction for a filter rod 10 filled with a paper sheet 12 using curled high-porosity paper as the base roll. Figure 8 The graph shows the results of a study on the relationship between average channel area and curling depth. Figure 9 It shows the exclusion Figure 6 The sample with an undesirable appearance included in the bottom oval shape was subsequently... Figure 6 A graph of the obtained data. Figure 10 Is for Figure 9 For each sample, plot the slope (vertical axis value / horizontal axis value) along the vertical axis and plot the hardness (%) of each sample along the horizontal axis.

[0068] exist Figure 6 In the diagram, ordinary paper samples are represented by circles (ordinary PF), and high-porosity paper samples are represented by squares (HPPPF). For example... Figure 6 As shown, it can be seen that when ordinary paper is used as the paper sheet 12 filling the filter rod 10, the increase in filling amount resulted in a group with a significant increase in airflow resistance and a group without an increase. Figure 6 The oval shape at the top surrounds a group of elements with significantly increased airflow resistance. In this case, the typical appearance of the filter rod 10 has been added to the oval shape, and the channels (orifices) are not obvious in this case, as... Figure 6 As shown. Meanwhile, Figure 6 The oval shape at the bottom surrounds a group where airflow resistance does not increase significantly even with increased filler volume. In this case, the typical appearance of filter rod 10 has been added to the oval shape, and the channels are prominent, resulting in an undesirable appearance, such as... Figure 6 As shown. That is to say, when ordinary paper is used as the paper sheet 12 filling the filter rod 10, the difference in airflow resistance corresponds to the difference in appearance.

[0069] From Figure 6The data for the samples shown are given in Tables 1 and 2 below.

[0070] [Table 1-1]

[0071]

[0072] [Table 1-2]

[0073]

[0074] [Table 1-3]

[0075]

[0076] [Table 2-1]

[0077]

[0078] [Table 2-2]

[0079]

[0080] [Table 2-3]

[0081]

[0082] In the data shown in Tables 1 and 2, the value of airflow resistance per 1 mm (mmH2O / mm) does not strictly match the value obtained by dividing the airflow resistance (mmH2O) by the length of filter rod 10 (120 mm). When manufacturing filter rod 10, it is difficult to prepare a sample with an exact length of 120 mm, and the measured length value is, for example, 120.3 mm. Therefore, the airflow resistance per 1 mm (mmH2O / mm) is obtained by dividing the airflow resistance by the measured value.

[0083] Furthermore, the inventors of this disclosure investigated the relationship between the average channel area in a filter rod 10 filled with ordinary paper as a filter rod 10 and the curling depth applied to the paper sheet 12 (the base roll). Specifically, the four types of paper shown in Table 3 below were investigated.

[0084] [Table 3]

[0085]

[0086] Figure 7A The diagram illustrates the distribution of channels of varying areas in a general cross-section perpendicular to the longitudinal direction for a filter rod 10 filled with paper sheets 12. These paper sheets are made from plain paper 1 with curl depths of 0 mm, 0.1 mm, 0.2 mm, 0.33 mm, and 0.4 mm, and plain paper 2 with a curl depth of 0.49 mm, as base rolls. Specifically, this cross-section is the longitudinal end face of the filter rod 10. Figure 7A The horizontal axis in the figure represents the area (mm²). 2 ), and the vertical axis represents the number of channels.

[0087] For reference only. Figure 7A The values ​​for filter rods 10 with inserted cellulose acetate filters (12YAF) instead of filled paper sheets 12 are also shown. (See figure) Figure 7A As shown, in the cross-section of the filter rod 10 into which the cellulose acetate filter is inserted, only areas with an area less than 0.1 mm² exist. 2 The passage.

[0088] Meanwhile, in the cross-section of the filter rod 10 filled with uncurled plain paper 1 (i.e., with a curling depth of 0 mm), there exists a 0.1 mm [unclear text - possibly a measurement or material] 2 Or a larger passageway. It can be said that, according to... Figure 7A The results show that as the curl deepens, the channel tends to become smaller. It should be noted that in... Figure 7A In the case of "SDP35 180 0.33" and "SDP35 140 0.49", this trend appears to be between 0.133 and 0.2 mm. 2 The area is reversed (the sample with a curl depth of 0.33 mm has more channels than the sample with a curl depth of 0.49 mm), but this is due to the different paper filling amounts of the two samples (the base rolls have different widths of 180 mm and 140 mm), and does not negate the aforementioned trend.

[0089] Figure 7B The distribution of channels of different areas on the longitudinal end face of the filter rod 10 filled with paper sheets 12 is shown. These paper sheets are based on high-porosity paper 1 and high-porosity paper 2, which are respectively processed to curl depths of 0.5 m, 0.7 mm and 0.9 mm. Figure 7B The horizontal axis in the figure represents the area (mm²). 2 (and the vertical axis represents the number of channels). Figure 7B As shown, filter rods filled with paper sheet 12, including high-porosity paper, tend to have smaller channels when a deeper curl is applied to the paper sheet 12 (the base roll).

[0090] Figure 8 The average channel area (mm²) is shown. 2 The results of a study on the relationship between the area of ​​the channel formed on the end face of the filter rod 10 and the curling depth (mm). From an aesthetic point of view, the average area (mm²) of the channel formed on the end face of the filter rod 10. 2 Preferably, it is 0.15 mm. 2 Or smaller. For example... Figure 8As shown, for both high-porosity paper and ordinary paper, the average channel area decreases with increasing applied curling depth. Specifically, for high-porosity paper, from... Figure 8 The curve shown indicates that, for high-porosity paper, the average area of ​​the channels formed in the end face of filter rod 10 is 0.15 mm². 2 The critical value for a curl depth of 0.4 mm or less is considered to be approximately 0.4 mm. That is, when the filler is a high-porosity paper with a curl depth of 0.4 mm or greater, it ensures that the average area of ​​the channels formed in the end face of the filter rod 10 is 0.15 mm². 2 Or even less. Changes in airflow resistance are also typically suppressed by deeper curling, so it is arguably more preferable to apply a curling depth of 0.5 mm or greater.

[0091] From Figure 8 The data for the samples shown are given in Tables 4 and 5 below.

[0092] [Table 4-1]

[0093]

[0094] [Table 4-2]

[0095]

[0096] [Table 5]

[0097]

[0098] Figure 9 It shows the exclusion Figure 6 Samples with undesirable appearance included in the elliptical shape at the bottom (excluding those with an average channel area exceeding 0.15 mm²) 2 (from the sample) Figure 6 A graph of the obtained data. However, the vertical axis was changed to a value for air permeability per 1 mm length. For example... Figure 9 As shown, it can be seen that the sample with filter rod 10 filled with ordinary paper and the sample filled with high-porosity paper are different. Figure 9 The values ​​have different slopes (vertical axis value / horizontal axis value) [mmH2O×mm] 2 / mg]. In addition... Figure 9 The two straight lines in the graph are used as a reference to show the typical slope of each sample, and they are not strict statistical values ​​(such as the average value of each sample).

[0099] Figure 10 Is for Figure 9 For each sample, plot the slope (vertical axis value / horizontal axis value) along the vertical axis [mmH2O×mm]. 2 / mg] and plot the hardness (%) along the horizontal axis in the direction perpendicular to the long axis of each sample. It should be noted that the hardness (%) in the direction perpendicular to the longitudinal direction of the filter rod 10 is a quantity obtained by the following formula.

[0100] Hardness (%) in the direction perpendicular to the long axis = (Dd / Ds) × 100

[0101] Here, Ds (mm) is the diameter of the cross-section in the direction perpendicular to the long axis of the filter rod 10 before the load F is applied, and Dd (mm) is the diameter of the cross-section in the direction perpendicular to the long axis of the filter rod 10 after the load F is applied. The load F is the load applied to the filter rod 10 under the conditions of a compressive load of 3 N / mm in the direction perpendicular to the long axis and a compression time of 10 seconds. It should be noted that the following paper is used as the first filter rod forming paper 14: S52-7000 (basis weight: 52 gsm, air permeability: 7000 CORESTA units, thickness: 110 µm), manufactured by Nippon Paper Papylia Co., Ltd.

[0102] For the hardness measurements described in this disclosure, the measurements performed below will use this paper as the first filter rod forming paper 14.

[0103] The paper filter (and the filter rod 10 used as its material) needs to have a certain level of stiffness to be smoothly processed in existing manufacturing systems during the production of flavored inhalation articles. Specifically, the stiffness in the direction perpendicular to the longitudinal direction of the filter rod 10 is preferably 75% or greater.

[0104] Therefore, will be considered Figure 10 The region with a medium hardness of 75% or greater. This region is located on the right and is defined by a vertical dotted line. This region includes samples of filter rods 10 with paper sheets 12 filled with ordinary paper and samples of filter rods 10 with paper sheets 12 filled with high-porosity paper. Figure 10 As shown, if the value on the vertical axis is 22 [mmH2O×mm] 2 [ / mg], it is clear that the sample with ordinary paper on top and the sample with high porosity paper on the bottom can be separated.

[0105] The following points can be observed from the above research results. A filter rod 10, filled with high-porosity paper 12 and possessing preferred airflow resistance, sufficient rigidity, and a desired appearance, can be characterized by the following conditions: (1) a rigidity of 75% or greater in the direction perpendicular to the long axis of the filter rod 10; (2) an average area of ​​channels formed in the cross-section perpendicular to the ventilation direction of the filter rod 10 that is less than 0.15 mm². 2; and (3) the pressure drop / filling density of the filler material per 1 mm length in the long axis direction of the filter rod 10 is less than 22 [mmH2O×mm 2 / mg]. The range that satisfies the above three conditions corresponds to Figure 10 The lower right region is one of the four regions defined by the vertical and horizontal dashed lines.

[0106] The inventors of this disclosure carefully measured the filter rod 10 filled with paper sheets 12 produced from the base rolls used as the two examples and four comparative examples shown in Table 6. Figure 11 The graphs show the porosity of the example and comparative examples 1-3 after the 0.5 mm curling treatment.

[0107] [Table 6]

[0108]

[0109] It should be noted that the porosity of the base roll (and the paper sheet 12 produced from the base roll) typically increases when a curling process has been performed. Table 7 shows the results from the example and comparative examples when a 0.5 mm curling process was performed in each example and comparative example and the porosity was measured by stacking four sheets.

[0110] [Table 7]

[0111]

[0112] like Figure 11 As shown, after the 0.5 mm curling treatment, the porosities in Examples 1 and 2 are approximately 23,000 and approximately 22,000 CORESTA units, respectively, both exceeding 15,000 CORESTA units. Meanwhile, after the 0.5 mm curling treatment, the porosities in Comparative Examples 1-3 are approximately 13,000, approximately 9,000, and approximately 7,000 CORESTA units, respectively, all below 15,000 CORESTA units.

[0113] It should be noted that in both examples, the width of the base roll of paper sheet 12 is 240 mm, and the basis weight is 21.5 g / m². 2 -23 g / m 2 However, it is clear that if this range is expanded as follows, it is still possible to produce a filter rod 10 with suitable airflow resistance and stiffness.

[0114] The basis weight of the base roll of paper sheet 12 is 15 g / m². 2 -40 g / m 2 .

[0115] [Configuration of flavored inhalation products]

[0116] Flavored inhalation products can be constructed using paper filter rods as filters, which are obtained by cutting filter rods 10 to a predetermined length along the longitudinal direction. Figure 12 This is a side cross-sectional schematic diagram showing an example of a flavor inhalation product 110 employing a paper filter. Figure 13 This is a side cross-sectional schematic diagram of a flavor inhalation article 200 according to another example, which uses a paper filter rod 20 obtained by cutting the filter rod 10 in the longitudinal direction.

[0117] exist Figure 12 In the example shown, the flavored inhalation article 110 includes a puffable material 111, a tubular member 114, a hollow filter portion 116, and a filter portion 115. The filter portion 115 is formed from a paper filter rod 20 obtained by cutting the filter rod 10 in the longitudinal direction.

[0118] The puffable material 111 is wrapped with cigarette paper 112. The tubular member 114, the hollow filter portion 116, and the filter portion 115 are wrapped with a tipping paper 113, which is different from the cigarette paper 112, and the tipping paper wraps a portion of the puffable material 111 wrapped with cigarette paper 112. The tipping paper 113 also wraps a portion of the cigarette paper 112 surrounding the puffable material 111. This connects the tubular member 114, the hollow filter portion 116, and the filter portion 115 to the puffable material 111. The puffable material 111 wrapped with cigarette paper 112 is an example of a second filter rod in this disclosure.

[0119] The outer surface of the end of the tip 113 near the filter portion 115 may be coated with a lip anti-adhesive 117 to facilitate separation of the user's lips from the tip 113. The portion of the flavor inhalation article 110 to which the lip anti-adhesive 117 is applied serves as the mouthpiece of the flavor inhalation article 110.

[0120] Furthermore, the tubular member 114 may have concentric perforations in the circumferential direction. The perforations facilitate the inflow of external air generated by the user's inhalation, and the inflow of air through the perforations can reduce the temperature of the flavor inhalation product 110 and the inflowing air.

[0121] For example, the puffable material 111 may contain a flavor source (such as tobacco) and an aerosol source. Furthermore, the cigarette paper 112 wrapping the puffable material 111 may be a breathable sheet component. The tubular component 114 may be a paper tube or a hollow filter. Figure 2In the example shown, the flavor inhalation article 110 includes an inhalable material 111, a tubular member 114, a hollow filter portion 116, and a filter portion 115, but the configuration of the flavor inhalation article 110 is not limited thereto. For example, the hollow filter portion 116 may be omitted, and the tubular member 114 and the filter portion 115 may be arranged adjacent to each other.

[0122] Furthermore, when producing the filter rod 10, the base roll of the paper sheet 12 can also be processed to adjust the flavor in the flavor-absorbing product. For example, at least one of the phenolic raw materials and flavoring agents can be added to the base roll of the paper sheet 12.

[0123] The term "phenolic compound" refers to a type of compound in which one or more hydroxyl groups are bonded to an aromatic hydrocarbon group. Examples that may be listed include phenol, o-cresol, m-cresol, p-cresol, and catechol. Accordingly, "phenolic reducing material" in this disclosure is an additive that can reduce at least one phenolic compound (e.g., like phenol, o-cresol, m-cresol, p-cresol, and / or catechol) when the paper filter rod 20 is used as the filter portion 115 of the flavored inhalant 110, for example, as measurable using a standard smoking test.

[0124] In addition, paper filter rods 20 are used for construction. Figure 12 The filter portion 115 of the flavor inhalation article 110 is used, but the use of paper filter rods 20 in flavor inhalation articles is not limited to paper filters. For example, as... Figure 13 As shown, a flavor inhalation product 200 can also be produced, wherein a paper filter rod 20 forms the end on the upstream side (opposite to the downstream end portion inhaled by the user) of the flavor inhalation product.

[0125] like Figure 13 As shown, the flavor inhalation article 200 includes: a first section 210, a flavor generating section 220, a cooling section 230, and a second section 240. The flavor inhalation article 200 includes: a first end 201 inserted into a flavor inhaler and a second end 102 located on the opposite side of the first end 201. Figure 12 In the depicted example, the flavor inhalation article 200 extends longitudinally along a central axis AX, wherein a first end 201 and a second end 202 are formed at each of the two ends of the flavor inhalation article along the longitudinal direction. Hereinafter, the first end 201 side and the second end 202 side are referred to as the "upstream side" and the "downstream side," respectively. Furthermore, hereafter, unless otherwise explicitly stated, "radial direction" and "circumferential direction" refer to the radial and circumferential directions of a rotating coordinate system centered on the central axis AX.

[0126] The first segment 210 is a segment disposed on the side of the first end 101 of the flavor-generating segment 220. The first segment 210 preferably extends from the first end 201 to the end portion of the flavor-generating segment 220 on the side of the first end 201. The first segment 210 includes a filter rod portion 211 and a cylindrical second tipping paper 250 covering the filter rod portion 211. The filter rod portion 211 is formed from a paper filter rod 20 obtained by cutting the filter rod 10 in the longitudinal direction. Furthermore, the second tipping paper 250 not only covers the filter rod portion 211 but also covers the flavor source 221 (described later) wrapped in cigarette paper 248, and connects the first segment 210 and the flavor-generating segment 220. The filter rod portion 211 is an example of a first filter rod of this disclosure.

[0127] Flavor-generating section 220 includes a flavor source 221 and a cylindrical cigarette paper 248 covering the flavor source 221. There are no particular limitations on the flavor source 221, as long as it generates flavor by means of heat; however, the flavor source 221 is preferably tobacco material. Examples of tobacco materials that may be cited include materials obtained by processing dried tobacco leaves, such as chopped tobacco, or tobacco extracts (extracts obtained with water, organic solvents, or mixtures thereof). The flavor source 221 can be formed from one or more tobacco sheets. The tobacco sheets can be formed, for example, by processing dried tobacco leaves into sheets that are homogenized using well-known methods such as papermaking, pulping, or rolling (this sheet will be referred to below as a "homogenized sheet"). Furthermore, the flavor source 221 can be chopped tobacco flakes. The flavor source 221 may include at least one of a flavoring agent, a coolant, and a flavoring agent, replacing the tobacco material or the tobacco material. The flavor-generating section 220 (flavor source 221 wrapped in cigarette paper 248) is an example of the second filter rod of this disclosure.

[0128] The cooling section 230 has a hollow tube 231 and a cylindrical tipping paper 260 covering the hollow tube 231. For example, the hollow tube 231 can be a paper tube, etc. The hollow tube 231 cools the vapor or aerosol generated by the flavor source 221. By arranging the hollow tube 231 downstream of the flavor source 221 in this way, the vapor or aerosol generated by the flavor source 221 can be cooled. Furthermore, as... Figure 12 As shown, the tipping paper 260 not only covers the hollow tube 231, but also covers a portion of the flavor source 221 that is wrapped by the second tipping paper 250 and the cigarette paper 248, as well as the outer filter rod forming paper 350 (described later), and connects the flavor generation section 220, the cooling section 230, and the second section 240.

[0129] Multiple circular through-holes 232 are formed in the hollow tube 131 and the tipping paper 260. These circular through-holes radially penetrate the walls of both the hollow tube 231 and the tipping paper 260 in a concentric manner in the circumferential direction of the hollow tube 231. The through-holes 232 are for facilitating the inflow of external air generated by the user's suction, and the vapor or aerosol generated by the flavor source 221 can be further cooled by the inflow of this air.

[0130] The second section 240 is a section disposed on the second end 102 side of the cooling section 230. The second section 240 includes: a first filter 241 and a second filter 242 arranged side-by-side in the longitudinal direction; and an outer filter rod forming paper 350 covering the first filter 242 and the second filter 242. There are no particular limitations on the second section 240, as long as it functions as a filter for adjusting airflow during flavor inhalation and for adjusting the amount of mixed flavors or other materials. The second section 240 can also be used as a post-filter rod to prevent components on the first end 201 side of the second section 240 from falling off.

[0131] It should be noted that the location of the first filter 241 is not limited to... Figure 13 The positions shown are such that, for example, the positions of the first filter 241 and the second filter 242 can be switched. Furthermore, the second filter 242 may be omitted from the flavor inhalation article 200, or the second segment 240 may include three or more filters.

[0132] The first filter 141 includes a filling material 310 and a cylindrical first inner filter rod forming paper 320 that wraps the filling material 310. There are no particular limitations on the filling material 310, as long as it is a filter material, and it can be a fibrous material or a porous material, etc. The filling material 310 can be, for example, cellulose acetate fiber, paper, or nonwoven fabric. The filling material 310 can be formed from a paper filter rod 20 obtained by cutting the filter rod 10 in the longitudinal direction.

[0133] The second filter 242 is formed of a filling layer 330 having a hollow portion and a second inner filter rod forming paper 340 covering the filling layer 330. The filling layer 330 may be, for example, a rod in which cellulose acetate fibers have been filled to a high density, and a plasticizer containing triacetin has been added to and cured into the rod. The second inner filter rod forming paper 340 may be omitted.

[0134] Furthermore, the method used in this disclosure to measure "hardness (%)" will be described. The measuring device used may be a "SODIUM-H hardness module" (KORBER) or an alternative device. Figure 14As shown, a filter rod 10 with a length of 120 mm is inserted vertically into a predetermined portion of the measuring device 30, and pressure is applied from the side using a cylindrical clamp 32. In this test, the pressure is set to 300 g. The clamp 32 uses a clamp with a diameter of φ12 mm. Regarding the pressure application position, the clamp 32 is placed at least 6 mm vertically above the lower vertical end of the filter rod 10, and pressure is applied.

[0135] The measurement conditions of the measuring device are described below.

[0136] Device: SODIUM-H hardness module

[0137] Procedure: Apply pressure from the side of the test piece, and the value calculated from the diameter before and after pressure is read as the hardness.

[0138] <Calculation Formula>

[0139] Hardness (%) in the direction perpendicular to the long axis = (Dd / Ds) × 100

[0140] Ds (mm) is the diameter of the cross-section in the direction perpendicular to the long axis of the filter rod 10 before pressure is applied, and

[0141] Dd (mm) is the diameter of the cross section in the direction perpendicular to the long axis of the filter rod 10 when pressure is applied.

[0142] <Measuring Equipment Conditions>

[0143] Pressure: 300 g, pressurization time: 10 seconds, pressure fixture head diameter: φ12 mm, number of test pieces during measurement: 1

[0144] (The actions in this embodiment)

[0145] In this embodiment, the filter rod 10 has a stiffness greater than 75% in the direction perpendicular to its long axis, and a paper sheet 12 made of high-porosity paper is used as the filling material for the paper filter rod 20 (the paper filter rod is obtained by cutting the filter rod 10 to a predetermined length in the longitudinal direction). The paper filter rod 20 filled with the high-porosity paper sheet 12 has inconspicuous channels and also has the desired airflow resistance. Therefore, this embodiment makes it possible to provide a paper filter rod 20 that has airflow resistance within a predetermined range and sufficient stiffness, while also having the desired appearance.

[0146] Furthermore, in this embodiment, high-porosity paper with an airflow resistance of 15,000 CORESTA units is used as the base roll of the paper sheet 12 filling the paper filter rod 20. Therefore, this embodiment enables the provision of a paper filter rod 20 that appropriately exhibits the advantages of a high-porosity paper filling material.

[0147] Furthermore, in this embodiment, a curling depth of 0.4 mm or greater is applied to the paper sheet 12 filling the paper filter rod 20. The desired airflow resistance and stiffness are ensured in the paper filter rod 20 filled with the high-porosity paper sheet 12 to which a curling depth of 0.4 mm or greater has been applied. Therefore, this embodiment makes it possible to provide a paper filter rod 20 that ensures the desired airflow resistance and stiffness.

[0148] Furthermore, in this embodiment, the paper sheet 12 of the filled paper filter rod 20, made of high-porosity paper, has a porosity of 15 g / m³. 2 -40 g / m 2 The basis weight. The desired appearance is ensured in the paper filter rod 20 filled with this paper sheet 12. Therefore, this embodiment makes it possible to provide a paper filter rod 20 that ensures a desired appearance.

[0149] Furthermore, in this embodiment, the paper sheet 12 filling the paper filter rod 20 has a porosity greater than 7000 CORESTA units before curling. The paper filter rod 20 filled with this high-porosity paper sheet 12 has inconspicuous channels and also has the desired airflow resistance. Therefore, this embodiment makes it possible to provide a paper filter rod 20 with airflow resistance within a predetermined range while also having the desired appearance.

[0150] Furthermore, in this embodiment, the flavor inhalation article 110 is configured to include: a paper filter rod 20 filled with a sheet of paper 12 made of high-porosity paper and having a stiffness greater than 75% in the direction perpendicular to its long axis; a puffable material 111 wrapped with cigarette paper 112 and containing a flavor source; and a tipping paper 113 wrapped around the paper filter rod 20 and around the puffable material 111 wrapped with cigarette paper 112. Therefore, this embodiment enables the production of a flavor inhalation article 110 having airflow resistance within a predetermined range and sufficient stiffness, while also possessing a desired appearance.

[0151] Furthermore, in this embodiment, a filter rod portion 211 formed of a paper filter rod 20 is disposed upstream of the flavor generating section 220 (flavor source 221 wrapped in cigarette paper 248) inside the flavor inhalation article 200. When the user inhales, air flows from upstream through the flavor generating section to downstream. According to this embodiment, by means of the filter rod portion 211 formed of the paper filter rod 20, leakage of vapors or aerosols generated in the flavor generating section 220 to the upstream side of the flavor inhalation article 200 can be suppressed.

[0152] The embodiments of this disclosure have been described above; however, this disclosure is not limited to those embodiments, and various modifications can be made within the scope of the technical concepts disclosed in the claims, specification, and drawings. Furthermore, any shape or material not directly stated in the specification or drawings is also within the scope of the technical concept of this disclosure, provided that it embodies the function of this disclosure.

[0153] (Note 1)

[0154] The first aspect of this disclosure relates to a paper filter rod comprising a filling material and an inner filter rod forming paper wrapped around the filling material, wherein...

[0155] The average area of ​​the holes formed in the cross-section perpendicular to the major axis is less than 0.15 mm. 2 The hardness defined in formula (1) is greater than 75% in the direction perpendicular to the long axis and satisfies formula (2).

[0156] Hardness (%) in the direction perpendicular to the long axis = (Dd / Ds) × 100 (1)

[0157] Pressure drop / filling density of filler material per 1 mm length along the long axis < 22 mmH2O×mm 2 / mg (2)

[0158] (In formula (1):

[0159] Ds (mm) is the diameter of the cross-section in the direction perpendicular to the long axis of the paper filter rod before the load F is applied.

[0160] Dd (mm) is the diameter of the cross-section in the direction perpendicular to the long axis of the paper filter rod when the load F is applied, and

[0161] The load F is the load applied to the paper filter rod under the conditions of a 3 N compressive load in the direction perpendicular to the long axis of the paper filter rod, a φ12 mm pressure clamp head diameter, and a compression time of 10 seconds.

[0162] (Note 2)

[0163] The second aspect of this disclosure, based on the first aspect, is a paper filter rod wherein the filling material is formed of one or more rolled sheets, and the porosity of the sheets is greater than 15,000 CORESTA units.

[0164] (Note 3)

[0165] The third aspect of this disclosure, based on the first and second aspects, is a paper filter rod wherein the sheet has a curling depth of 0.4 mm or greater.

[0166] (Note 4)

[0167] The fourth aspect of this disclosure, based on the first to third aspects, is a paper filter rod, wherein the basis weight of the sheet is 15 g / m³. 2 -40 g / m 2 .

[0168] (Note 5)

[0169] The fifth aspect of this disclosure, which is based on any one of the first to fourth aspects, is a paper filter rod, wherein the sheet has a porosity greater than 7,000 CORESTA units before being rolled.

[0170] (Note 6)

[0171] The sixth aspect of this disclosure is a flavored inhalation article comprising: a paper filter rod as disclosed in the first to fifth aspects, the paper filter rod serving as a first filter rod; a second filter rod containing a flavor source; and a tipping paper wrapped around the first and second filter rods.

[0172] (Note 7)

[0173] The seventh aspect of this disclosure, based on the sixth aspect, is a flavored inhalation article in which a paper filter rod is disposed on the upstream side of a second filter rod.

[0174] List of reference numerals

[0175] 10… filter rod

[0176] 12…paper pieces

[0177] 12a…Mountain section

[0178] 12b…Valley section

[0179] 14…First filter rod forming paper

[0180] 20…paper filter rods

[0181] 30… Measuring device

[0182] 32… Fixture

[0183] 110…flavored inhalation products

[0184] 111…Suctionable material

[0185] 112…cigarette paper

[0186] 113…Contact Paper

[0187] 114… tubular components

[0188] 115…Filter Section

[0189] 116… Hollow Filter Section

[0190] 117…lip anti-adhesive

[0191] 200…flavored inhalation products

[0192] 201…First End

[0193] 202…Second End

[0194] 210...First paragraph

[0195] 211...Filter rod section

[0196] 220...Flavor Generation Section

[0197] 221...Flavor Source

[0198] 230... Cooling section

[0199] 231... Hollow tube

[0200] 232...through hole

[0201] 240...Second paragraph

[0202] 241...First Filter

[0203] 242...Second Filter

[0204] 248…cigarette paper

[0205] 250…Second splice paper

[0206] 260…receiving paper

[0207] 310...filler material

[0208] 320... First inner layer filter rod forming paper

[0209] 330...fill layer

[0210] 340...Second inner layer filter rod forming paper

[0211] 350... Outer filter rod forming paper.

Claims

1. A paper filter rod, comprising: Filler material, and The inner filter rod forming paper wraps around the filler material. in, The average area of ​​the holes formed in the cross-section perpendicular to the major axis is less than 0.15 mm. 2 , The hardness defined in formula (1) is greater than 75% in the direction perpendicular to the major axis, and It satisfies formula (2). Hardness (%) in the direction perpendicular to the long axis = (Dd / Ds) × 100 (1) Pressure drop / filling density of filler material per 1 mm length along the long axis < 22 mmH2O×mm 2 / mg (2) (In formula (1): Ds (mm) is the diameter of the cross-section in the direction perpendicular to the long axis of the paper filter rod before the load F is applied. Dd (mm) is the diameter of the cross-section in the direction perpendicular to the long axis of the paper filter rod when the load F is applied, and The load F is the load applied to the paper filter rod under the conditions of a 3 N compressive load in the direction perpendicular to the long axis of the paper filter rod, a pressure clamp head diameter of φ12 mm, and a compression time of 10 seconds.

2. The paper filter rod as described in claim 1, wherein, The filler material is formed from one or more rolled sheets, and The sheet has a porosity of more than 15,000 CORESTA units.

3. The paper filter rod as described in claim 1 or 2, wherein, The sheet has a curling depth of 0.4 mm or greater.

4. The paper filter rod according to any one of claims 1 to 3, wherein, The basis weight of this sheet is 15 g / m². 2 -40 g / m 2 .

5. The paper filter rod according to any one of claims 1 to 4, wherein, The sheet has a porosity of more than 7,000 CORESTA units before it is rolled.

6. A flavored inhalation article, comprising: The paper filter rod as described in any one of claims 1 to 5 is used as a first filter rod; A second filter rod containing a flavor source; as well as A splicing paper is used to wrap around the first filter rod and the second filter rod.

7. The flavored inhalation article of claim 6, wherein, The paper filter rod is located on the upstream side of the second filter rod.

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