WO2022230408A1

WO2022230408A1 - Paper filter for flavor inhalation product

Info

Publication number: WO2022230408A1
Application number: PCT/JP2022/011646
Authority: WO
Inventors: 哲也本溜
Original assignee: 日本たばこ産業株式会社
Priority date: 2021-04-27
Filing date: 2022-03-15
Publication date: 2022-11-03
Also published as: CN117241684A; KR20230160879A; US20240049775A1; JPWO2022230408A1; EP4331394A1

Abstract

Provided is a paper filter for a flavor inhalation product, the paper filter having a rod-form filter medium and a rolled paper that rolls up the filter medium, wherein: the filter medium includes a wave-shaped paper sheet in which peaks and troughs are arranged in an alternating manner and so as to be continuous in a long-axis direction; the airflow resistance in an airflow direction ranges from 0.2 mm H₂O/mm to 1.0 mm H₂O/mm; and the hardness in a direction perpendicular to the long axis ranges from 80.0% to 95.0%.

Description

Paper filters for flavor suction articles

The present invention relates to a paper filter for flavor absorbing articles.

Acetate filters made by processing synthetic fibers such as cellulose acetate tow into rods are widely and commonly used as filters for flavor inhaling products. On the other hand, a paper filter has also been developed in which a filter material such as paper (pure pulp) is wound with a plug winding paper.

Patent Literatures 1 and 2 describe a paper filter obtained by folding a corrugated paper with pleats and wrapping it with a roll paper.
Paper filters are superior in terms of environmental issues, stable supply, cost reduction, heat resistance, etc., and future demand is expected to increase.

JP-A-9-294576 JP-A-9-294577

In the case of acetate filters, which are widely used in flavor inhaling articles, it is necessary to change the thickness of the fibers, the number of fibers, etc. in order to adjust the ventilation resistance, but in the case of paper filters, for example, the paper that constitutes the filter material There is an advantage in that the ventilation resistance of the filter can be adjusted by a simple method such as adjusting the width of the filter.
However, conventional paper filters have a problem that if the ventilation resistance is set within an appropriate range, the hardness becomes insufficient, causing inconvenience such as buckling during use. For example, in a non-combustion heating type flavor inhaling article that is used by inserting it into an electric heating device, if the ventilation resistance of the filter is too high, not only unnecessary fine particles but also flavor components are removed. Therefore, it is desirable to reduce the ventilation resistance of the paper filter. occur. In Patent Documents 1 and 2, there is room for improvement without considering a technique for achieving hardness that does not cause such problems while reducing ventilation resistance.
Accordingly, an object of the present invention is to provide a paper filter for flavor inhaling articles that has a low ventilation resistance and sufficient hardness.

As a result of intensive studies, the present inventors have found that using a filter medium containing a corrugated paper sheet in which crests and troughs are arranged alternately and continuously in the long axis direction, the air resistance of the paper filter is low and sufficient. The present inventors have arrived at the present invention based on the discovery that a high hardness can be achieved. That is, the gist of the present invention is as follows.

[1]
A paper filter for flavor inhaling articles comprising a rod-shaped filter medium and a paper roll around which the filter medium is wound,
wherein the filter medium comprises a corrugated paper sheet having alternating peaks and valleys and continuous longitudinally;
The ventilation resistance in the ventilation direction is 0.2 mmH ₂ O/mm or more and 1.0 mmH ₂ O/mm or less,
A paper filter for flavor inhaling articles, having a hardness of 80.0% or more and 95.0% or less in a direction perpendicular to the long axis represented by the following formula (1).
Hardness in the direction perpendicular to the long axis (%) = (D _d /D _s ) x 100 (1)
(In formula (1), D _s (mm) is the diameter of the cross section in the direction perpendicular to the longitudinal direction of the paper filter before applying load F; D _d (mm) is the diameter of the paper filter after applying load F is the diameter of the cross section in the direction perpendicular to the longitudinal direction of the paper filter at the time; the load F is a compressive load of 3 N / mm in the direction perpendicular to the longitudinal axis of the paper filter and a compression time of 10 seconds. is the load applied by
[2]
A paper filter for flavor inhaling articles comprising a rod-shaped filter medium and a paper roll around which the filter medium is wound,
wherein the filter medium comprises a corrugated paper sheet having alternating peaks and valleys and continuous longitudinally;
The ventilation resistance in the ventilation direction is 0.2 mmH ₂ O/mm or more and 1.0 mmH ₂ O/mm or less,
A paper filter for flavor inhaling articles, wherein the maximum compression load measured while compressing the paper filter in the longitudinal direction at a compression speed of 20 mm/min is 15 N or more and 30 N or less.
[3]
The paper filter for flavor inhaling articles according to [1] or [2], wherein the difference between the maximum height of the peaks and the maximum depth of the valleys is 50 μm or more and 500 μm or less.
[4]
The corrugated paper sheet is obtained by creping a raw material sheet having a basis weight of 40 gsm to 120 gsm, a thickness of 30 μm to 130 μm, and a width of 70 mm to 200 mm,
Any one of [1] to [3], wherein the width is a length in a direction perpendicular to a direction corresponding to the longitudinal direction of the filter medium including the corrugated paper sheet made from the raw material sheet. The paper filter for flavor suction articles according to 1.
[5]
The paper filter for flavor inhaling articles according to any one of [1] to [4], wherein the filter medium has a density of 0.16 g/cm ³ or more and 0.34 g/cm ³ or less.
[6]
The paper filter for flavor absorbing articles according to any one of [1] to [5], wherein the paper has a basis weight of 30 gsm or more and 100 gsm or less and a thickness of 30 μm or more and 130 μm or less.
[7]
A filter segment for flavor inhaling articles, comprising the paper filter for flavor inhaling articles according to any one of [1] to [6].
[8]
A rod-shaped flavor suction article having a tobacco rod portion and a mouthpiece portion,
A flavor inhaling article, wherein the mouthpiece portion includes the paper filter for flavor inhaling articles according to any one of [1] to [6].
[9]
a creping step of creping the raw material sheet to form the corrugated paper sheet;
a bundling step of bundling the corrugated paper sheets to form the filter media;
A winding step of winding the filter material with a roll of paper;
The method for producing a paper filter for flavor inhaling articles according to any one of [1] to [6], comprising

According to the present invention, it is possible to provide a paper filter for flavor inhaling articles that has low airflow resistance and sufficient hardness.
Further, in a preferred embodiment of the present invention, it is possible to provide a paper filter whose hardness is increased by the paper material forming the filter medium without being reinforced by increasing the thickness and basis weight of the web.

FIG. 4 is a diagram showing elements for defining hardness in a direction perpendicular to the long axis of a paper filter; It is a schematic diagram showing a method of measuring hardness in a direction perpendicular to the long axis of a paper filter. It is a schematic diagram showing a method of measuring hardness in the longitudinal direction of a paper filter. 1 is a schematic cross-sectional view of a paper filter according to first and second embodiments of the present invention; FIG. 1 is a schematic view of a corrugated paper sheet that constitutes the filter media of paper filters according to the first and second embodiments of the present invention; FIG. 1 is a schematic diagram of a flavor inhalation article having paper filters according to first and second embodiments of the present invention; FIG. 4 is a graph showing the relationship between the compression distance in the longitudinal direction of the paper filter obtained in Example 1 and the compression load.

Embodiments of the present invention will be described in detail below, but these descriptions are examples (representative examples) of embodiments of the present invention, and the present invention is not limited to these contents as long as they do not exceed the gist of the present invention.
In this specification, when a numerical value or a physical property value is sandwiched before and after the "~", it is used to include the values before and after it. Moreover, when the lower limit value and the upper limit value of the numerical range are described separately, the numerical range can be a combination of any lower limit value and any upper limit value.
Also, in this specification, "plurality" means two or more unless otherwise specified.

<Paper filter>
A paper filter according to a first embodiment of the present invention is a paper filter for flavor inhaling articles having a rod-shaped filter medium and a winding paper around which the filter medium is wound, wherein the filter medium has peaks and valleys. It contains corrugated paper sheets arranged alternately and continuously in the long axis direction, and has an airflow resistance in the airflow direction (hereinafter sometimes simply referred to as "airflow resistance") of 0.2 mmH ₂ O/mm or more1. It is 0 mmH ₂ O/mm or less, and the hardness in the direction perpendicular to the major axis represented by the following formula (1) is 80% or more and 95% or less.
Hardness in the direction perpendicular to the long axis (%) = (D _d /D _s ) x 100 (1)
(In formula (1), D _s (mm) is the diameter of the cross section in the direction perpendicular to the longitudinal direction of the paper filter before applying load F; D _d (mm) is the diameter of the paper filter after applying load F is the diameter of the cross section in the direction perpendicular to the longitudinal direction of the paper filter at the time; the load F is a compressive load of 3 N / mm in the direction perpendicular to the longitudinal axis of the paper filter and a compression time of 10 seconds. is the load applied by

Further, the paper filter according to the second embodiment of the present invention has a hardness of 80.0% or more and 95.0% or less in the direction perpendicular to the long axis, and the paper filter is compressed at a compression rate of 20 mm / min. The maximum value of the compressive load measured while compressing in the longitudinal direction (hereinafter sometimes referred to as "hardness in the longitudinal direction") is 15 N or more and 30 N or less, except that the first of the present invention It is similar to the paper filter according to the embodiment of .

The paper filters according to the first and second embodiments of the present invention are suitable for satisfactorily delivering flavor components such as nicotine, menthol, glycerin, and propylene glycol while removing unnecessary components such as tar in the airflow. It has a sufficient range of airflow resistance and a hardness that satisfies the user's preference and usability.

The ventilation resistance that can deliver flavor components well while removing unnecessary components varies depending on the type of components in the airflow passing through the paper filter, the length of the paper filter in the longitudinal direction, etc. Although not uniform, usually 0.2 mmH ₂ O/mm or more, preferably 0.25 mmH ₂ O/mm or more, more preferably 0.3 mmH ₂ O/mm or more, and usually 1.0 mmH ₂ O/mm or less, It is preferably 0.8 mmH ₂ O/mm or less, more preferably 0.6 mmH ₂ O/mm or less, still more preferably 0.5 mmH ₂ O/mm or less.

The airflow resistance of the paper filters according to the first and second embodiments of the present invention is measured according to the ISO standard method (ISO6565) using, for example, a filter airflow resistance measuring instrument manufactured by Cerulean. The airflow resistance of the paper filter is defined by a predetermined air flow rate (17.5 cc/min) from one end surface (first end surface) to the other end surface (second end surface) in a state in which air does not permeate the side surfaces of the paper filter. It refers to the air pressure difference between the first end face and the second end face when the air is flowed.

In this specification, the hardness that satisfies the user's preference and feeling of use is, for example, a hardness that can provide the user with a comfortable grip and a comfortable grip; For non-combustion-heating flavor inhalation products, the hardness is such that it can be inserted into an electric heating device without bending; It refers to the degree of hardness that does not deform when Hereinafter, as such hardness, hardness possessed by the paper filters according to the first and second embodiments of the present invention will be described below.

The paper filter according to the first embodiment of the present invention has a hardness in the direction perpendicular to the major axis of usually 80.0% or more, preferably 88.0% or more, and usually 95.0% or less, or more. Preferably, it is 92.0% or less. The hardness in the direction perpendicular to the long axis of the paper filter is within the range described later, such as the basis weight, thickness and width of the corrugated paper sheet in the filter medium or the raw material sheet forming the corrugated paper sheet; the density of the filter medium; and preferably by one or more selected from basis weight, thickness and width of the corrugated paper sheet or raw material sheet in the filter media.

The hardness in the direction perpendicular to the long axis of the paper filter represented by the formula (1) will be explained below.
Hardness in the direction perpendicular to the long axis of the paper filter (%)
= (D _d /D _s ) x 100 (1)
As shown in FIG. 1, _Ds represents the diameter of the cross section of the paper filter 10a in the direction perpendicular to the longitudinal direction before the load F is applied, and Dd represents the diameter of the paper filter _10b when the load F is applied. It represents the diameter of the cross section in the direction perpendicular to the longitudinal direction. A load F is a load applied to the paper filter in a direction perpendicular to its long axis under conditions of a compression load of 3 N/mm and a compression time of 10 seconds. The hardness in the direction perpendicular to the long axis of the paper filter becomes a value closer to 100.0% as the paper filter becomes harder.

The hardness in the direction perpendicular to the long axis of the paper filter is calculated by the following steps (i) to (iii).
(i) Find the diameter _Ds of the cross section of the paper filter 10a before the load F is applied in the direction perpendicular to the long axis direction.
(ii) A value obtained by applying a compressive load F of 3 N/mm and a compression time of 10 seconds to the paper filter 10a in a direction perpendicular to its long axis, and subtracting the depth pressed by the load F from _Ds . D _{Find d} . A load F is applied to the paper filter 10a, as shown in FIG. 2, by pressing a plunger 31 of a device such as a SODIM-H hardness module (manufactured by SODIM SUS) against the paper filter 10a.
(iii) From _Ds and _Dd , calculate the hardness in the direction perpendicular to the long axis based on equation (1).

The paper filter according to the second embodiment of the present invention has a longitudinal hardness of usually 15 N or more, preferably 17 N or more, more preferably 20 N or more, and usually 50 N or less, preferably 35 N or less, and more preferably is 30N or less. The hardness in the longitudinal direction of the paper filter should be within the range described later for the basis weight, thickness and width of the corrugated paper sheet in the filter medium or the raw material sheet forming the corrugated paper sheet; the density of the filter medium; It is preferably adjusted by the basis weight of the raw material sheet and/or the density of the filter material. Among these, as shown in the examples described later, the hardness in the longitudinal direction of the paper filter has a correlation with the density of the filter medium. It can be adjusted within the range.

As used herein, the hardness in the longitudinal direction of the paper filter means the maximum value among the measured values obtained by measuring the compressive load while compressing the paper filter in the longitudinal direction at a compression speed of 20 mm / min. do. In other words, the hardness in the longitudinal direction of the paper filter is the compressive load in the longitudinal direction required for buckling of the paper filter.

　The compressive load of the paper filter is measured by a rheometer such as CR-3000EX (manufactured by Sun Science Co., Ltd.). More specifically, as shown in FIG. 3, the plunger 32 of the rheometer is pressed against the paper filter 10, and the compression load is measured while compressing the paper filter 10 at a compression speed of 20 mm/min. The compressive load usually increases as the compression distance increases, and after reaching the maximum value, it gradually decreases. Therefore, the compression distance required to specify the maximum value of the compression load depends on the size of the paper filter, but as shown in Examples described later, when the cross-sectional diameter in the direction perpendicular to the major axis direction is 7.5 mm. When the length is 0 mm and the length in the major axis direction is 18.0 mm, it is about 1.0 mm.

Note that the paper filter according to the first embodiment of the present invention may have the same longitudinal hardness as the paper filter according to the second embodiment of the present invention. That is, the paper filter according to the first embodiment of the present invention may have a hardness of 15 N or more and 30 N or less in the longitudinal direction, and the preferred range of hardness in the longitudinal direction is also the second embodiment of the present invention. Similar to morphology.
Further, the same hardness in the direction perpendicular to the long axis as that of the paper filter according to the first embodiment of the present invention may be applied to the paper filter according to the second embodiment of the present invention. That is, the paper filter according to the second embodiment of the present invention may have a hardness of 80.0% or more and 95.0% or less in the direction perpendicular to the major axis, and the hardness in the direction perpendicular to the major axis is also the same as in the first embodiment of the present invention.

The airflow resistance and hardness as described above can be adjusted mainly by selecting the corrugated paper sheets contained in the web and filter media. It is preferable to adjust the ventilation resistance and hardness by using a paper roll generally used for filters for flavor inhaling articles, and selecting a corrugated paper sheet instead of the paper roll.

Hereinafter, paper filters according to first and second embodiments of the present invention will be described with reference to FIGS. 4 and 5. FIG.
FIG. 4 is a longitudinal sectional view of an example of the paper filter according to the first and second embodiments of the present invention. The paper filter 10 has a filter material formed by folding a corrugated paper sheet 11, and a winding paper 12 for winding the filter material and fixing the folded corrugated paper sheet 11 in a bar shape. Although FIG. 4 shows a state where the corrugated paper sheet 11 is folded, the corrugated paper sheet may be wound.

As shown in FIG. 5, the corrugated paper sheet 11 constituting the filter medium is arranged so that the peaks 11a and the valleys 11b are alternately arranged continuously in the long axis direction, so that one end surface of the paper filter ( The first end face) to the other end face (second end face) to form an airflow passage that allows airflow to flow.

The type of wood pulp used for the corrugated paper sheet 11 is not particularly limited, and wood pulp such as coniferous trees and hardwoods can be used.

As will be described later, the corrugated paper sheet 11 can be produced by subjecting a flat raw material sheet having no corrugations to a creping process to form peaks 11a and valleys 11b.

The basis weight, thickness and width of the raw material sheet are not particularly limited, and may be appropriately selected according to the desired airflow resistance and hardness of the paper filter and the circumference of the paper filter.
Specifically, the basis weight of the raw material sheet is usually 40 gsm or more, preferably 50 gsm or more, more preferably 60 gsm or more, and usually 120 gsm or less, preferably 110 gsm or less, more preferably 100 gsm or less. The basis weight of the raw material sheet is measured according to ISO 536:2019.
The thickness of the raw material sheet is usually 30 μm or more, preferably 50 μm or more, more preferably 70 μm or more, and usually 150 μm or less, preferably 140 μm or less, more preferably 130 μm or less. The thickness of the raw material sheet is measured according to ISO 534:2011.
The width of the raw material sheet is usually 60 mm or more, preferably 70 mm or more, more preferably 80 mm or more, and usually 200 mm or less, preferably 150 mm or less, more preferably 100 mm or less. The width of the raw material sheet is the length of the corrugated paper sheet in the direction perpendicular to the longitudinal direction in which the peaks and troughs are continuously arranged. It is the length in the direction perpendicular to the direction corresponding to the longitudinal direction of the filter medium to be obtained.

Since tension is applied to the raw material sheet when the raw material sheet is creped, the basis weight and thickness of the corrugated paper sheet may be several percent lower than the basis weight and thickness of the raw material sheet. It is comparable to the basis weight and thickness. The basis weight and thickness of the corrugated paper sheet are values measured in the same manner as for the raw material sheet while the corrugated paper sheet is stretched.

The difference h between the maximum height of the ridges 11a and the maximum depth of the troughs 11b of the corrugated paper sheet 11 may be appropriately set according to the airflow resistance and hardness of the paper filter and the thickness and basis weight of the raw material sheet. , usually 50 μm or more, preferably 90 μm or more, more preferably 100 μm or more, and usually 700 μm or less, preferably 500 μm or less, more preferably 300 μm or less.

The density of the filter medium calculated by the following formula (2) is not particularly limited, but from the viewpoint of achieving desired ventilation resistance and hardness, it is usually 0.16 g/cm ³ or more, preferably 0.18 g/cm ³ . Above, more preferably 0.20 g/cm ³ or more, and usually 0.34 g/cm ³ or less, preferably 0.32 g/cm ³ or less, more preferably 0.30 g/cm ³ or less.
Density of filter media = weight of corrugated paper sheet * 1 / volume of filter media * 2 (2)
*1: Weight of corrugated paper sheet = basis weight of corrugated paper sheet x width x length in major axis direction *2: Volume of filter medium = cross-sectional area of filter medium x length in major axis direction

The filter media may include, in addition to corrugated paper sheets, crushable additive release containers (eg, capsules) containing crushable outer shells such as gelatin. The embodiment of the capsule (also called "excipient release container" in the technical field) is not particularly limited, and known embodiments may be adopted. For example, a crushable additive containing a crushable outer shell such as gelatin It can be a release container. In this case, the capsule, when broken before, during or after use by the user of the flavored inhalation article, releases the liquid or substance (usually the flavorant) contained within the capsule, which then releases the liquid or The substance is transferred to the airflow passing through the flavor suction article during use of the flavor suction article and to the surrounding environment after use.

The shape of the capsule is not particularly limited. For example, it may be an easily breakable capsule, and the shape is preferably spherical. The additive contained in the capsule may contain any of the additives described above, but it is particularly preferred to contain an additive selected from flavoring agents and activated carbon. Additives may also include one or more materials to help filter out unwanted components such as tar. Although the form of the additive is not particularly limited, it is usually liquid or solid. It should be noted that the use of capsules containing excipients is well known in the art. Destructible capsules and methods of making them are well known in the art.

The winding paper around which the filter material is wound (hereinafter also referred to as "filter plug winding paper") is not particularly limited, and a winding paper generally used for winding a filter medium such as acetate tow can be adopted.

The form of the web is not particularly limited, and may include one or more rows of seams containing adhesive. The adhesive may comprise a hot melt adhesive, and the hot melt adhesive may comprise polyvinyl alcohol. Paper filters may include filter media other than filter media comprising corrugated paper sheets, and may be composed of a plurality of filter media. When the paper filter is composed of a plurality of filter media, it is preferable that the plurality of filter media be wound together in the paper roll.

The material of the roll paper is not particularly limited, and known wood pulp materials such as coniferous trees and hardwoods can be used, and fillers such as calcium carbonate may be included.
Further, the web may or may not be coated, but from the viewpoint of imparting functions other than strength and structural rigidity, it is preferably coated with a desired material.

The thickness, basis weight, etc. of the roll paper are not particularly limited. When using a roll of paper with a thickness and basis weight greater than usual, for example, a roll of paper with a basis weight of more than 100 gsm, it is possible to improve the hardness of the paper filter, but the user's feeling of use, such as grip and grip, is reduced. Or, there is a possibility that a sense of incongruity may arise in the feeling of use. Moreover, from the viewpoint of easy availability, it is preferable to employ a roll of paper that is generally used for filters for flavor inhaling articles.
That is, in the first and second embodiments of the present invention, the basis weight of the web is usually 30 gsm or more, preferably 40 gsm or more, more preferably 50 gsm or more, and usually 100 gsm or less, preferably 80 gsm or less, more preferably 60 gsm or less. The basis weight of the web is measured according to ISO 536:2019.
The thickness of the roll paper is usually 30 μm or more, preferably 50 μm or more, more preferably 70 μm or more, and usually 130 μm or less, preferably 120 μm or less, more preferably 110 μm or less. Web thickness is measured according to ISO 534:2011.

The paper filters according to the first and second embodiments of the present invention have a substantially circular cross-sectional shape in the direction perpendicular to the long axis, and the diameter of the circle is appropriately adjusted according to the shape of the flavor inhaling article to be used. Although it can be changed, it is usually 4.0 mm or more, preferably 4.5 mm or more, more preferably 5.0 mm or more, and usually 9.0 mm or less, preferably 8.5 mm or less, more preferably 8.0 mm or less. . If the cross section is not circular, the diameter of the circle is applied assuming a circle having the same area as the cross section.

The length of the perimeter of the cross-sectional shape in the direction perpendicular to the long axis of the paper filters according to the first and second embodiments of the present invention can be appropriately changed according to the size of the flavor inhaling article to be used, but is usually 14 0 mm or more, preferably 15.0 mm or more, more preferably 16.0 mm or more, and usually 27.0 mm or less, preferably 26.0 mm or less, more preferably 25.0 mm or less.

The longitudinal length of the paper filters according to the first and second embodiments of the present invention can be appropriately changed according to the size of the flavor inhaling article to be used. It may be 15.0 mm or more, 17.5 mm or more, or 20.0 mm or more, and may be 40.0 mm or less, 35.0 mm or less, 32.5 mm or less, or 30.0 mm or less.

<Manufacturing method of paper filter>
The method for manufacturing the paper filters according to the first and second embodiments of the present invention is not particularly limited, and methods according to known methods can be applied. Known methods include, for example, the methods described in JP-A-9-294576 and JP-A-9-294577. More specifically, a creping process of creping a raw material sheet to form a corrugated paper sheet, a bundling process of bundling the corrugated paper sheets to form a filter medium, and a winding process of winding the filter medium with a roll paper. A manufacturing method including steps.

In the crepe treatment process, the raw material sheet passes between a pair of crepe rollers. The crepe roller has a plurality of circumferentially extending parallel teeth on its surface, and the two crepe rollers are arranged so that the plurality of teeth mesh. Then, the raw material sheet is pressed by a plurality of teeth to form peaks and troughs alternately and continuously in the longitudinal direction to form a corrugated paper sheet. Since the difference h between the maximum height of the crests and the maximum depth of the troughs of the corrugated paper sheet is a value determined by the pitch and width of a plurality of teeth, it is adjusted by selecting the pitch and width of the teeth of the crepe roller. can do.

In the bundling process, the mode of bundling the corrugated paper sheets is not particularly limited, and the corrugated paper sheets may be folded as shown in FIG. 4 or rolled up.

The winding process is a process of winding the corrugated paper sheet with the roll paper so that the corrugated paper sheet can maintain the bar shape of the filter material. In the winding step, the filter material may be wrapped with a roll of paper, and the filter medium may be wrapped with a roll of paper, and then the overlapping portion of the roll of paper may be glued.

<Flavor inhalation article>
The paper filters according to the first and second embodiments of the invention are used in flavor inhalation articles.
In this specification, the term "flavor inhalation article" is a general term for inhalation articles with which the user tastes a flavor such as tobacco flavor. More specifically, the flavor inhaling articles include combustion-type flavor inhaling articles that provide flavor to users by burning a flavor source; non-combustion type flavor inhaling articles that provide flavor to users by heating without burning a flavor source; heated flavor inhalation articles; and non-combustion, non-heated flavor inhalation articles that provide the user with a flavor derived from a flavor source without heating or burning the flavor source.

The flavor inhalation article includes a rod-shaped flavor inhalation article having a tobacco rod portion and a mouthpiece portion, particularly a combustion type flavor inhalation article or a non-combustion heating type flavor inhalation article. As a preferred example of the flavor inhaling article, a non-combustion heating type flavor inhaling article will be described with reference to FIG.

In FIG. 6, the non-combustion heating flavor inhalation article 20 has a tobacco rod portion 21 and a mouthpiece portion 24. The tobacco rod portion 21 contains dry tobacco leaves (dried tobacco leaves).
The mouthpiece portion 24 has a filter segment 23 containing paper filters according to the first and second embodiments of the invention. The mouthpiece portion 24 preferably has a cooling segment 22 in addition to the filter segment 23, and the cooling segment 22 and the filter segment 23 are arranged adjacent to each other.

The non-combustion-heating flavor inhalation article 20 shown in FIG. 6 is a rod-shaped non-combustion-heating flavor inhalation article comprising a tobacco rod portion 21, a mouthpiece portion 24, and a tip paper 25 formed by wrapping them. , the mouthpiece portion 24 includes a cooling segment 22 and a filter segment 23 including a paper filter according to the first or second embodiment of the present invention, and is , the cooling segment 22 is sandwiched adjacent to the tobacco rod portion 21 and the filter segment 23, and an opening V is provided concentrically in the circumferential direction of the cooling segment 22 (that is, the direction perpendicular to the long axis). may have been The opening V is a hole that facilitates the inflow of air from the outside by the suction of the user, and the inflow of air can lower the temperature of the components and the air that flow in from the tobacco rod portion 21 .

The filter segment 23 may further include center hole segments having one or more hollow portions in addition to the paper filters according to the first and second embodiments of the present invention. The center hole segment is usually arranged closer to the cooling segment than the paper filter, preferably adjacent to the cooling segment.

A center hole segment is composed of a filling layer having one or more hollow portions and an inner plug wrapper (inner roll paper) covering the filling layer. For example, the center hole segment is composed of a filling layer having a hollow portion and an inner plug wrapper covering the filling layer. Since the packed bed has a high packing density of fibers, air and aerosol flow only through the hollow portion during suction, and hardly flow inside the packed bed. Since the filling layer inside the center hole segment is a fiber filling layer, the feeling of touch from the outside during use rarely causes a user to feel uncomfortable. Note that the center hole segment may not have the inner plug wrapper and may retain its shape by thermoforming.

The center hole segment and the paper filter may be connected by, for example, an outer plug wrapper (outer roll paper). The outer plug wrapper can be, for example, a cylinder of paper. Further, the tobacco rod portion 21, the cooling segment 22, and the connected center hole segment and paper filter may be connected by, for example, mouthpiece lining paper. For these connections, for example, paste such as vinyl acetate paste is applied to the inner surface of the mouthpiece lining paper, and the tobacco rod portion 21, the cooling segment 22, and the connected center hole segment and paper filter are placed and wound. can be connected with In addition, these may be divided into multiple times and connected with multiple lining papers.

From the viewpoint of improving strength and structural rigidity, the filter segment 23 may include a filter plug winding paper around which a paper filter or the like is wound. Embodiments of the filter plug web are not particularly limited and may include one or more rows of adhesive-containing seams. The adhesive may comprise a hot melt adhesive, and the hot melt adhesive may comprise polyvinyl alcohol. Moreover, when the filter segment 23 consists of two or more segments, the filter plug winding paper is preferably wound together with these two or more segments.

The cross-sectional shape of the filter segment 23 in the direction perpendicular to the long axis is substantially circular, and the diameter of the circle can be appropriately changed according to the size of the flavor inhaling article, but is usually 4.0 mm or more, preferably 4.0 mm or more, preferably 4 mm or more. 0.5 mm or more, more preferably 5.0 mm or more, and usually 9.0 mm or less, preferably 8.5 mm or less, more preferably 8.0 mm or less. If the cross section is not circular, the diameter of the circle is applied assuming a circle having the same area as the cross section.

The length of the circumference of the cross-sectional shape in the direction perpendicular to the long axis of the filter segment 23 can be appropriately changed according to the size of the flavor inhaling article, but is usually 14.0 mm or more, preferably 15.0 mm or more, more preferably 15.0 mm or more. It is 16.0 mm or more, and usually 27.0 mm or less, preferably 26.0 mm or less, more preferably 25.0 mm or less.

The length of the longitudinal direction of the filter segment 23 can be appropriately changed according to the size of the flavor suction article, and may be 15.0 mm or more, 17.5 mm or more, or 20.0 mm or more. It may be 0 mm or less, 35.0 mm or less, 32.5 mm or less, or 30.0 mm or less.
The shape and dimensions of the paper filters according to the first and second embodiments of the present invention can be appropriately adjusted so that the shape and dimensions of the filter segments 23 are within the above ranges.

Although the present invention will be described more specifically by way of examples, the present invention is not limited to the description of the following examples as long as it does not deviate from the gist thereof.

<Example 1>
A paper filter was prepared according to the method described in JP-A-9-294577.
Specifically, a raw material sheet having a basis weight of 40 gsm, a thickness of 30 μm, and a width of 140 mm (Glassine manufactured by Nippon Paper Papylia Co., Ltd.) unrolled from a roll was passed between a pair of crepe rollers. At this time, each of the pair of crepe rollers has a plurality of teeth extending in parallel in the circumferential direction on the roller surface, and the plurality of teeth has a pitch of 1.0 mm and a face width of 0.3 mm. used something. The width of the raw material sheet means the length of the roll around which the raw material sheet is wound in the direction perpendicular to the winding direction.
By passing between a pair of crepe rolls, peaks and troughs were formed alternately and continuously in the roll feed direction of the raw material sheet, resulting in a corrugated paper sheet. The difference h between the maximum height of the peaks and the maximum depth of the valleys was 200 μm.
The corrugated paper sheets thus obtained were bundled so as to form a rod shape and the roll feed direction of the raw material sheet was aligned with the long axis direction of the rod shape to obtain a filter medium. Table 1 shows the density of the filter media calculated based on the above formula (2).
Subsequently, this filter medium was wrapped with a roll paper (manufactured by Nippon Paper Papylia Co., Ltd.; S52-7000) having a basis weight of 52 gsm and a thickness of 110 μm. A paper filter with a length of 18 mm was obtained.

<Examples 2-3, Comparative Examples 1-2>
A paper filter was obtained in the same manner as in Example 1, except that the raw material sheet was changed to one shown in Table 1.
Table 1 shows the difference h between the maximum height of peaks and the maximum depth of valleys of the corrugated paper sheets of Examples 2 and 3 and Comparative Examples 1 and 2.

<Measurement of ventilation resistance>
Based on the ISO standard method (ISO6565), the airflow resistance of the paper filter was measured using a filter airflow resistance measuring instrument manufactured by Cerulean. The airflow resistance of the paper filter is defined by a predetermined air flow rate (17.5 cc/min) from one end surface (first end surface) to the other end surface (second end surface) in a state in which air does not permeate the side surfaces of the paper filter. It refers to the air pressure difference between the first end face and the second end face when the air is flowed. Table 1 shows the results.

<Measurement of hardness in the direction perpendicular to the long axis>
First, the diameter _Ds of the cross-section perpendicular to the longitudinal direction of the paper filter before the load F was applied was measured. Then, using a SODIM-H hardness module (manufactured by SODIM SUS, plunger diameter 12 mm), a compressive load of 3 N / mm and a compression time of 10 seconds were applied to the paper filter in a direction perpendicular to the long axis of the paper filter for 10 seconds. , and _Dd , which is a value obtained by subtracting the depth pushed by the load F from _Ds , was obtained. Subsequently, from the obtained _Ds and _Dd , the hardness in the direction perpendicular to the long axis was calculated based on the above formula (1). Table 1 shows the results.

<Measurement of hardness in longitudinal direction>
Using a rheometer (manufactured by Sun Scientific Co., Ltd., CR-3000EX, plunger diameter 5 mm), the compressive load was measured while compressing the paper filter in the longitudinal direction at a compressing speed of 20 mm/min. The maximum value of the measured compressive load was obtained as the longitudinal hardness of the paper filter. FIG. 7 shows the relationship between the compression distance of the paper filter obtained in Example 1 and the compression load. Table 1 shows the longitudinal hardness of the paper filters obtained in Examples 1-3 and Comparative Examples 1-2.

From Table 1, by setting the basis weight, thickness and width of the raw material sheet, and the difference between the maximum height of the peaks and the maximum depth of the valleys of the corrugated paper sheet to appropriate values, the ventilation resistance in the ventilation direction can be reduced to 0. It was confirmed that a paper filter having sufficient hardness can be obtained even when it is set to 0.2 mmH ₂ O/mm or more. For example, when comparing Examples 1 and 3, which have almost the same airflow resistance, even if the width of the raw material sheet is reduced, by increasing the basis weight and thickness, the air flow in the direction perpendicular to the long axis of the paper filter is reduced. It can be seen that the hardness can be increased. In addition, when comparing Example 1 and Comparative Example 2, which have the same airflow resistance, even if the thickness of the raw material sheet is reduced, the hardness in the direction perpendicular to the long axis of the paper filter is increased by increasing the basis weight. I know it will improve. From this result, it is considered that the basis weight of the raw material sheet has a greater effect on the hardness in the direction perpendicular to the major axis than the thickness of the raw material sheet.

Furthermore, from Table 1, it can be seen that there is a correlation between the longitudinal hardness of the paper filter and the density of the filter medium. Therefore, the hardness in the longitudinal direction of the paper filter obtained in Example 2 is higher than that of the paper filter obtained in Example 1 and lower than that of the paper filter obtained in Example 3, and is about 23N to 26N. guessed. Further, it is considered that the basis weight of the raw material sheet has a large effect on the hardness in the direction of the long axis, as well as the hardness in the direction perpendicular to the long axis of the paper filter. Therefore, the longitudinal hardness of the paper filter obtained in Comparative Example 1 is presumed to be lower than that of the paper filter obtained in Example 1 and higher than that of the paper filter obtained in Comparative Example 2.

The paper filter obtained in Comparative Example 2 has a low hardness of 4.2 N in the longitudinal direction. When used in a flavor suction article, it cannot be inserted into an electric heating device without bending; occur. As described above, the paper filter obtained in Comparative Example 1 is inferior in feeling when used, and it is difficult to use it without any inconvenience when it is used for flavor inhalation articles.
On the other hand, in Examples 1 and 3, compared with Comparative Example 2, although the airflow resistance in the airflow direction of the paper filter is almost the same, the hardness in the longitudinal direction is as high as 15 N or more. less likely to cause problems. Therefore, by using these paper filters in the flavor inhalation article, not only can a good flavor be obtained, but also the user's preference and feeling of use can be satisfied, and a series of operations in using the flavor inhalation article can be stably performed. It is possible to give the user a sense of security that it can be done.

10 Paper filter 10a Paper filter (no load)
10b Paper filter (with load)
11 corrugated paper sheet 11a crest 11b trough 12 winding paper 20 non-combustion heating flavor sucking article 21 tobacco rod 22 cooling segment 23 filter segment 24 mouthpiece 25 tipping paper V aperture 31 plunger 32 plunger

Claims

A paper filter for flavor inhaling articles comprising a rod-shaped filter medium and a paper roll around which the filter medium is wound,
wherein the filter medium comprises a corrugated paper sheet having alternating peaks and valleys and continuous longitudinally;
The ventilation resistance in the ventilation direction is 0.2 mmH 2 O/mm or more and 1.0 mmH 2 O/mm or less,
A paper filter for flavor inhaling articles, having a hardness of 80.0% or more and 95.0% or less in a direction perpendicular to the long axis represented by the following formula (1).
Hardness in the direction perpendicular to the long axis (%) = (D d /D s ) x 100 (1)
(In formula (1), D s (mm) is the diameter of the cross section in the direction perpendicular to the longitudinal direction of the paper filter before applying load F; D d (mm) is the diameter of the paper filter after applying load F is the diameter of the cross section in the direction perpendicular to the longitudinal direction of the paper filter at the time; the load F is a compressive load of 3 N / mm in the direction perpendicular to the longitudinal axis of the paper filter and a compression time of 10 seconds. is the load applied by
A paper filter for flavor inhaling articles comprising a rod-shaped filter medium and a paper roll around which the filter medium is wound,
wherein the filter medium comprises a corrugated paper sheet having alternating peaks and valleys and continuous longitudinally;
The ventilation resistance in the ventilation direction is 0.2 mmH 2 O/mm or more and 1.0 mmH 2 O/mm or less,
A paper filter for flavor inhaling articles, wherein the maximum compression load measured while compressing the paper filter in the longitudinal direction at a compression speed of 20 mm/min is 15 N or more and 30 N or less.
The paper filter for flavor inhaling articles according to claim 1 or 2, wherein the difference between the maximum height of the peaks and the maximum depth of the valleys is 50 µm or more and 500 µm or less.
The corrugated paper sheet is obtained by creping a raw material sheet having a basis weight of 40 gsm to 120 gsm, a thickness of 30 μm to 130 μm, and a width of 70 mm to 200 mm,
4. The width is the length in the direction perpendicular to the direction corresponding to the longitudinal direction of the filter medium containing the corrugated paper sheet made from the raw material sheet. The paper filter for flavor suction articles according to 1.
The paper filter for flavor inhaling articles according to any one of claims 1 to 4, wherein the filter medium has a density of 0.16 g/cm 3 or more and 0.34 g/cm 3 or less.
The paper filter for flavor absorbing articles according to any one of claims 1 to 5, wherein the paper roll has a basis weight of 30 gsm or more and 100 gsm or less and a thickness of 30 µm or more and 130 µm or less.
A filter segment for flavor inhaling articles, comprising the paper filter for flavor inhaling articles according to any one of claims 1 to 6.
A rod-shaped flavor suction article having a tobacco rod portion and a mouthpiece portion,
A flavor inhaling article, wherein the mouthpiece portion comprises the paper filter for flavor inhaling articles according to any one of claims 1 to 6.
a creping step of creping the raw material sheet to form the corrugated paper sheet;
a bundling step of bundling the corrugated paper sheets to form the filter media;
A winding step of winding the filter material with a roll of paper;
The method for producing a paper filter for flavor inhaling articles according to any one of claims 1 to 6, comprising