WO2023105683A1

WO2023105683A1 - Filter, flavor inhalation article comprising said filter, and device and method for producing said filter

Info

Publication number: WO2023105683A1
Application number: PCT/JP2021/045134
Authority: WO
Inventors: 拓也赤羽; 和正荒栄
Original assignee: 日本たばこ産業株式会社
Priority date: 2021-12-08
Filing date: 2021-12-08
Publication date: 2023-06-15
Also published as: JPWO2023105683A1

Abstract

A filter (6) used in a flavor inhalation article (1), wherein: the filter (6) comprises a sheet filling part (16) in which sheets (24) comprising a web material are gathered in a width direction Y intersecting the longitudinal direction X of the sheets (24) and are reduced in size to or below the diameter of the filter (6), and a rolled paper (18) in which the sheet filling part (16) is wrapped; and the sheets (24) have first crinkle regions (26) in which a prescribed number of crinkle parts (30) are formed by implementing a crinkle treatment on a partial region extending over the entire longitudinal direction X.

Description

Filter, flavor inhaling article provided with the filter, and apparatus and method for manufacturing the filter

The present invention relates to a filter, a flavor inhaling article comprising the filter, and a manufacturing apparatus and manufacturing method for the filter.

Patent Document 1 discloses a method for manufacturing a variable compression web material. The method comprises the steps of providing a continuous web of material, crimping a first region of web material at a first crimp value, and compressing a second region of web material adjacent to the first region to a first compression value. and crimping at two crimp values. The web material is pressed using a pair of rollers. Each roller is formed with a corrugated portion across its width, that is, along the axial direction of each roller.

Also, this wave-shaped portion is formed along the circumference of each roller, that is, along the circumferential direction of each roller. The corrugated sections are interleaved with each other along the axial direction of each roller to compress the web material. Specifically, the troughs of the wavy portions formed along the outer peripheral surface of each roller press the web material with a first compression value, and the wavy shape formed along the outer peripheral surface of each roller. crimps the web material at a second crimp value.

This forms in a single action a crimped web material with regions of different crimp values along the length of the web material. That is, in Patent Document 1, as shown in FIG. 2 of Patent Document 1, regions of different crimp values are formed in the web material by changing the engagement depth of the corrugated portions of each roller.

The corrugated portions are ridges and grooves formed along the entire circumference of the outer peripheral surface of each roller, and the ridges and grooves are formed at a predetermined pitch in the axial direction of each roller. be done. For this reason, the number of meshing portions where the protruding line and the recessed line are meshed is constant. Therefore, as shown in FIG. 3 of Patent Document 1, an airflow directing element formed from a crimped web material, in other words, a filter, has a crimp value of Although different, a large number of crimped portions having a uniform corrugated wave shape are formed in the web material at predetermined intervals over the entire length of the web material.

Japanese Patent No. 6553038

When the web material of Patent Document 1 is used as a filter material for a flavor inhaling article (hereinafter also simply referred to as an article), the web material is formed with a large number of crimped portions having a uniform shape, so the porosity of the filter is reduced. decrease, and the ventilation resistance of the filter increases. As a result, the suction force required for the user to suck the article increases, so the amount of the flavor component that the user can ingest from the article 1 per puff decreases, the so-called sucking response of the article decreases, and the smoking taste is impaired. There is a risk that

In addition, since the crimped portion must have a uniform shape of ridges or grooves, filters with various variations cannot be formed. In addition, forming a large number of crimped portions of a uniform shape in the web material may reduce the rigidity of the filter and cause breakage of the filter. In addition, when a large number of crimped portions having a uniform shape are formed in the web material, a large amount of material powder (paper powder in the case of a paper web) is generated when the web material is crimped. A large amount of material powder contaminates the facility significantly, increasing the burden of cleaning the facility and reducing the productivity of the filter.

The present invention has been made in view of such problems, and by reducing ventilation resistance and increasing rigidity, the quality of filters and flavor inhaling articles is improved, and the productivity of filters and flavor inhaling articles is improved. An object of the present invention is to provide a filter, a flavor inhaling article comprising the filter, and a manufacturing apparatus and manufacturing method for the filter, which can realize various variations.

In order to achieve the above object, a filter according to one aspect is a filter for use in a flavor inhaling article, wherein a sheet made of a web material is gathered in the width direction intersecting the longitudinal direction of the sheet and contracted to a diameter equal to or less than the diameter of the filter. The sheet has a diameter-diametered sheet filling portion and a wrapping paper wrapped in the sheet filling portion, and the sheet is formed with a predetermined number of crimped portions by performing a crimping process on a partial region extending in the longitudinal direction. and a first crimped region.

A flavor inhalation article according to one aspect comprises a filter as described above.
A filter manufacturing apparatus according to one aspect is a filter manufacturing apparatus for use in flavor inhaling articles, and includes a sheet processing section for processing a sheet made of a series of web materials while being transported along a transport path, and a sheet processing section for processing the sheet in the transport path. a gathering section that gathers the sheet processed in the sheet processing section in the width direction intersecting the longitudinal direction in the conveying process to form a sheet filling rod having a diameter reduced to the diameter of the filter or less; a wrapping section for wrapping the sheet filling rod formed by the wrapping paper to form a filter rod; and a cutting section for cutting the filter rod formed by the wrapping section into filters, the sheet processing section comprising a first roller and a second roller for sandwiching and conveying the sheet in the conveying path, wherein the first roller is formed with a convex portion protruding over a part of the outer peripheral surface thereof in the circumferential direction, and the second roller is provided with is formed over a part of its outer peripheral surface in the circumferential direction, and the roller set has an engaging portion in which the convex portion and the concave portion mesh with each other through the sheet when the sheet is sandwiched and conveyed. and has a first meshing region in which a predetermined number of meshing portions are formed in a partial region extending in the circumferential direction of each outer peripheral surface, and the first meshing region is a partial region extending in the longitudinal direction of the seat. By crimping the region, a first crimped region having a predetermined number of crimped portions corresponding to the number of meshing portions is formed.

A method of manufacturing a filter according to one aspect is a method of manufacturing a filter for use in a flavor inhaling article, comprising: a sheet processing step of processing a sheet made of a series of web materials while conveying the sheet; a gathering step of gathering the sheet processed in the step in a width direction intersecting the longitudinal direction to form a sheet filling rod having a diameter reduced to a diameter equal to or less than the diameter of the filter; and a sheet filling rod formed in the gathering step. with wrapping paper to form a filter rod; and a cutting step of cutting the filter rod formed in the wrapping step into filters. A crimping process is performed to form a first crimped region having a predetermined number of crimped portions by performing a crimping treatment on a partial region extending over the entire length of the first crimped region.

By reducing the ventilation resistance of the filter and increasing the rigidity of the filter, the quality of the filter can be improved, the productivity of the filter can be improved, and various variations can be realized. It is possible to provide a flavor inhalation article comprising the filter, and a manufacturing apparatus and manufacturing method for the filter.

1 is a cross-sectional view of a flavor inhalation article; FIG. FIG. 4 is a perspective view of a sheet before processing; 1 is a perspective view of a crimped sheet; FIG. It is a longitudinal cross-sectional view in the 1st filling part of a filter. It is a longitudinal cross-sectional view in the 2nd filling part of a filter. 1 is a schematic diagram of a filter manufacturing apparatus; FIG. It is a flow chart explaining a manufacturing method of a filter. 4 is a perspective view of a roller set sandwiching a sheet; FIG. It is a schematic diagram of the outer peripheral surface of a 1st and 2nd roller. It is sectional drawing which expanded the meshing|engagement part of a 1st meshing area|region. FIG. 9 is a perspective view of the roller set when the sheet is further fed out from the state of FIG. 8; It is sectional drawing which expanded the meshing part of the 2nd meshing area|region. 1 is a perspective view of a sheet having uncrimped regions; FIG. 14 is a schematic diagram of the outer peripheral surfaces of the first and second rollers forming the sheet of FIG. 13; FIG. 15 is an enlarged cross-sectional view of a non-meshing region formed in the roller set of FIG. 14; FIG. FIG. 10 is a perspective view of a sheet in which the crimped portion of the second crimped region is a rectangular concave portion; FIG. 17 is a schematic diagram of the outer peripheral surfaces of the first and second rollers forming the sheet of FIG. 16; 18 is an enlarged cross-sectional view of a meshing portion of a second meshing region formed in the roller set of FIG. 17; FIG. FIG. 10 is a perspective view of a sheet in which the crimped portion of the second crimped region is a triangular convex portion; FIG. 20 is a schematic diagram of the outer peripheral surfaces of the first and second rollers forming the sheet of FIG. 19; FIG. 21 is an enlarged cross-sectional view of a meshing portion of a second meshing region formed in the roller set of FIG. 20; FIG. 10 is a perspective view of a sheet in which the crimped portion of the second crimped region becomes a horizontal groove. FIG. 23 is a schematic diagram of the outer peripheral surfaces of the first and second rollers forming the sheet of FIG. 22; FIG. 24 is an enlarged cross-sectional view of a meshing portion of a second meshing region formed in the roller set of FIG. 23; 1 is a schematic diagram showing an example of a non-combustion heating type flavor inhaling article. FIG. FIG. 3 is a schematic diagram showing another example of a non-combustion heating type flavor inhalation article. FIG. 3 is a schematic diagram showing another example of a non-combustion heating type flavor inhalation article. FIG. 3 is a schematic diagram showing another example of a non-combustion heating type flavor inhalation article. FIG. 3 is a schematic diagram showing another example of a non-combustion heating type flavor inhalation article. FIG. 3 is a schematic diagram showing another example of a non-combustion heating type flavor inhalation article. FIG. 3 is a schematic diagram showing another example of a non-combustion heating type flavor inhalation article. FIG. 2 is a schematic diagram showing an example of a combustion heating type flavor inhaling article. FIG. 3 is a schematic diagram showing another example of a combustion heating type flavor inhaling article. FIG. 3 is a schematic diagram showing another example of a combustion heating type flavor inhaling article. FIG. 3 is a schematic diagram showing another example of a combustion heating type flavor inhaling article.

FIG. 1 shows a cross-sectional view of a non-combustion heating type flavor inhaling article 1 (hereinafter also referred to as an article). The article 1 is composed of, for example, a flavoring element 2, a tubular element 4 and a filter 6. The article 1 is formed by arranging the flavoring element 2 , the tubular element 4 and the filter 6 in this order side by side in the axial direction X and wrapping them with tipping paper 8 . Flavor element 2 is formed by wrapping flavor raw material 10 with wrapping paper 12 .

The flavor element 2 is heated by a heater of a device (flavor inhaler) (not shown) when the article 1 is used, and the flavor component of the flavor raw material 10 volatilizes. A conductive member such as a metal plate or metal grains may be mixed in the flavor raw material 10 . In this case, the presence of the electrically conductive member causes the device to generate a magnetic field and the induced current of the magnetic field heats the flavor element 2 .

The flavor raw material 10 is, for example, shredded tobacco, shredded tobacco sheets, or gathered tobacco sheets. The flavor raw material 10 is a sheet formed from pulp not containing tobacco to which a flavor is added, a sheet formed from a non-tobacco plant and shredded, or a sheet formed by folding these sheets into a corrugated shape. can be

The tubular element 4 is a cylindrical, for example, paper tube formed from a single or double paper web, and forms an airflow path in the article 1 . A plurality of vent holes 14 are formed in the peripheral surface of the tubular element 4 for drawing air into the article 1 when the article 1 is sucked. Flavor components volatilized from the flavor element 2 are cooled by the air taken into the article 1 from the outside through each air hole 14 to form an aerosol, and the user of the article 1 inhales the aerosol.

The filter 6 is a filter body, and is formed by wrapping the sheet filling portion 16 with wrapping paper 18 . The sheet filling section 16 is integrally formed from a first filling section 20 and a second filling section 22 . The first filling section 20 is positioned downstream of the airflow path in the filter 6 and has a mouthpiece end 6 a of the filter 6 . The second filling portion 22 is located upstream of the airflow path in the filter 6 and is adjacent to the first filling portion 20 in the axial direction X of the filter 6 .

FIG. 2 shows a perspective view of the sheet 24 of filter material before processing. The filter material of filter 6 is a single sheet 24 of paper web (web material). The sheet 24 has, for example, a rectangular shape in a plan view. A direction is defined as the width direction Y of the sheet 24 .

The sheet 24 has a first crimped region 26 in a partial region extending in the longitudinal direction X, and a second crimped region 28 in a region adjacent to the first crimped region 26 of the sheet 24 in the longitudinal direction X. have The area A1 of the first crimped region 26 is less than or equal to the area A2 of the second crimped region 28 . The sheet filling unit 16 shown in FIG. 1 crimps the sheet 24 and then gathers the sheet 24 in the width direction Y, in other words, gathers and bundles the sheet 24, and reduces the diameter to the diameter of the filter 6 or less. It is formed. Therefore, in the axial direction X, the length of the first filling portion 20 is the length of the second filling portion 22 or less.

FIG. 3 shows a perspective view of a crimped sheet 24. FIG. A predetermined number of crimped portions 30 are formed in the first crimped region 26 by crimping. The crimping process is a creping process in which the sheet 24 is shaped to have unevenness at intervals. The crimped portion 30 is a fine uneven wrinkle formed on the sheet 24, and by forming the crimped portion 30 on the sheet 24, a stretchable crepe paper is formed. The crimped portion 30 is defined as a concave portion with various shapes or a convex portion with various shapes protruding from the flat surface of the sheet 24 .

In the case shown in FIG. 3 , the crimped portion 30 of the first crimped region 26 is a vertical groove 30 a extending in the longitudinal direction X of the sheet 24 . For example, seven vertical grooves 30a are formed in the first crimped region 26 at intervals in the width direction Y of the sheet 24 . A smaller number of crimped portions 30 are formed in the second crimped region 28 than in the case of the first crimped region 26 by crimping. In the case shown in FIG. 3 , the crimped portion 30 of the second crimped region 28 is a vertical groove 30 a having the same shape as that of the first crimped region 26 . For example, two vertical grooves 30a are formed in the second crimped region 28 with an interval in the width direction Y of the sheet 24 .

4 shows a longitudinal sectional view of the first filling portion 20 of the filter 6, and FIG. 5 shows a longitudinal sectional view of the second filling portion 22 of the filter 6. FIG. The first filling portion 20 is formed by gathering in the width direction Y the first crimped region 26 having each crimped portion 30 shown in FIG. The second filling portion 22 is formed by gathering in the width direction Y the second crimped region 28 having each crimped portion 30 shown in FIG.

The first filling portion 20 is formed by gathering the first crimped region 26 having a larger number of crimped portions 30 than the second filling portion 22 . Therefore, the first filling portion 20 has a lower porosity than the second filling portion 22 and an increased ventilation resistance. On the other hand, the second filling portion 22 is formed by gathering the second crimped region 28 having fewer crimped portions 30 than the first filling portion 20 . Therefore, the second filling portion 22 has a higher porosity and a lower ventilation resistance than the first filling portion 20 .

Specifically, the ventilation resistance per unit length of the sheet filling portion 16 in the axial direction X is preferably 1.5 times or more that of the second filling portion 22 in the first filling portion 20 . Here, the filter 6 used for the non-combustion-heating article 1 tends to have a relatively small ventilation resistance. Therefore, when the ventilation resistance of both the first and

second filling portions

20 and 22 is relatively small, it becomes difficult to measure the ventilation resistance.

In this case, a plurality of first filling parts 20 are prepared by cutting from the sheet filling part 16, each first filling part 20 is connected in the axial direction X to form a continuum, and the ventilation resistance of this continuum is measured. Then, the ventilation resistance per unit length of the first filling portion 22 is calculated from this measured value. A similar continuum is formed for the second filling portion 22, and the airflow resistance per unit length of the second filling portion 22 is calculated from the airflow resistance of this continuum. As a result, even if the measured values of the airflow resistance of the first and

second filling portions

20 and 22 are too small to be compared, the airflow resistance of the first filling portion 20 is equal to the airflow resistance of the second filling portion 22. can be confirmed to be 1.5 times or more.

FIG. 6 shows an outline of a manufacturing apparatus 40 for the filter 6, and FIG. 7 shows a flowchart explaining the manufacturing method of the filter 6. Manufacturing apparatus 40 includes a sheet feeding section 42, a sheet processing section 44, a gathering section 46, a wrapping section 48, a cutting section 50, an inspection section 52, and the like.

When the manufacture of the filter 6 is started, the sheet supply section 42 supplies a series of sheets 24 made of paper webs to the transport path 54 (S1: sheet supply step). Next, the sheet processing section 44 processes the sheet 24 while conveying it along the conveying path 54 (S2: sheet processing step). Sheet processing section 44 includes roller set 56 and control unit 58 .

The roller set 56 is composed of a first roller 60 and a second roller 62 , and the first and

second rollers

60 and 62 sandwich and convey the sheet 24 in the conveying path 54 . A rotating shaft of at least one of the first and

second rollers

60 and 62 is connected to a drive shaft of a motor (not shown) and driven to rotate by the motor. The motor is electrically connected to the control unit 58 . The rotational speed of the first and

second rollers

60 , 62 is controlled via motors based on signals from the control unit 58 .

FIG. 8 shows a perspective view of the roller set 56 with the sheet 24 sandwiched therebetween. The first roller 60 is formed with a ridge (projection) 64 projecting over a part of the outer circumferential surface thereof in the circumferential direction Z. As shown in FIG. The second roller 62 is formed with grooves (recesses) 66 that mesh with the ridges 64 over a part of the outer circumferential surface thereof in the circumferential direction Z. As shown in FIG. When the roller set 56 sandwiches and conveys the sheet 24, the first and

second rollers

60 and 62 rotate in the directions of the arrows shown in FIG. A meshing portion 68 is formed in the set 56 .

FIG. 9 shows a schematic diagram of the outer peripheral surfaces of the first and

second rollers

60 and 62. FIG. The roller set 56 has a first meshing region 70 in which a predetermined number of meshing portions 68 are formed in a part of the outer circumferential surface of each of the first and

second rollers

60 and 62 in the circumferential direction Z. The first interlocking region 70 is crimped by each interlocking portion 68 in a partial region extending in the longitudinal direction X of the sheet 24 . Further, the roller set 56 has a second meshing region 72 in a region adjacent to the first meshing region 70 of each of the outer peripheral surfaces of the first and

second rollers

60 and 62 in the circumferential direction Z. have.

10 shows an enlarged cross-sectional view of the meshing portion 68 of the first meshing region 70, and FIG. 11 shows an enlarged cross-sectional view of the meshing portion 68 of the second meshing region 72. As shown in FIG. The second interlocking region 72 has fewer interlocking portions 68 than the first interlocking region 70 and, as shown in FIG. That is, the second crimped region 28 is crimped. For example, the second meshing region 72 may have two meshes 68, and the second crimped region 28 of the sheet 24 may have a number of crimps corresponding to the number of meshes 68, as also shown in FIG. As 30, two vertical grooves 30a are formed.

FIG. 12 shows a perspective view of the roller set 56 when the sheet 24 is further fed out from the state of FIG. For example, seven interlocking portions 68 are formed in the first interlocking region 70, and the first crimped region 26 of the sheet 24, as also shown in FIG. As 30, seven vertical grooves 30a are formed. Thus, in the sheet processing step S2, the first crimped region 26 having a predetermined number of crimped portions 30 corresponding to the number of the meshed portions 68 is formed on the sheet 24 (P1: crimping process).

In the crimping process P1, a second crimped region 28 having a smaller number of crimped portions 30 than the first crimped region 26 is also formed in the sheet 24 . The area A3 (see FIG. 9) of each first meshing region 70 in the first and

second rollers

60, 62 is the area A4 (see FIG. 9) of each second meshing region 72 in the first and

second rollers

60, 62. It is below. As a result, as described above, the area A1 of the first crimped region 26 becomes equal to or smaller than the area A2 of the second crimped region 28. In other words, in the axial direction X, the length of the first filling portion 20 is the second filling It becomes equal to or less than the length of the portion 22 .

Next, as shown in FIGS. 6 and 7, the gathering section 46 gathers the series of sheets 24 processed in the sheet processing section 44 in the width direction Y while the sheets 24 are transported in the transport path 54. to form a sheet filling rod 74 whose diameter is reduced to the diameter of the filter 6 or less (S3: gathering step). When the sheet filling rod 74 is formed into the filter rod 76 in a later step and then cut into the filter 6, it forms the sheet filling section 16 in which the first filling section 20 and the second filling section 22 are integrated. do.

Specifically, the gathering section 46 includes a liquid addition booth 78, a granule addition unit 80, a trumpet guide 82, a tongue 84, and the like in order from the upstream side in the transport direction of the transport path 54. The liquid addition booth 78 sprays a liquid additive onto the sheet 24 before gathering (P2: liquid addition process). Additives are liquids including, for example, plasticizers and perfumes. The granule adding unit 80 comprises a hopper 80a and a spreading roller 80b.

The granules are stored in the hopper 80a, and the scatter roller 80b scatters the granules supplied from the hopper 80a onto the sheet 24 before gathering. Granules are granular additives, including particles of, for example, activated charcoal or perfume. Both the trumpet guide 82 and the tongue 84 are tubular. The inner peripheral surface of the trumpet guide 82 is gradually reduced in diameter from the upstream side of the conveying path 54 .

The trumpet guide 82 collects the sheet 24 conveyed along the conveying path 54 at random while reducing the diameter of the sheet 24 into a rod shape, and discharges it toward the tongue 84 . By passing the gathered rod-shaped sheet 24 through the tongue 84 , the diameter of the rod-shaped sheet 24 is further reduced to the diameter of the filter 6 or less and formed into the sheet filling rod 74 .

Next, the wrapping section 48 wraps the sheet filling rod 74 with the supplied wrapping paper 18 to form a filter rod 76 (S4: wrapping step). Next, the cutting section 50 cuts the filter rod 76 into a predetermined length of the filter 6 (S5: cutting step) to form the filter 6. FIG. Next, the inspection section 52 inspects the length ratio R in the axial direction X between the first filling portion 20 and the second filling portion 22 in the sheet filling portion 16 of the filter 6 (S6: inspection step).

By cutting the filter rod 76 in the cutting step S5, a large number of filters 6 having the same length in the axial direction X are formed. Since the individual filters 6 have the same length, the length ratio R of the first and

second filling portions

20 and 22 forming the filter 6 is inspected in the inspection step S6. This inspection is performed, for example, by irradiating the peripheral surface of the filter 6 with inspection light such as transmitted infrared light and recognizing the captured image. Instead of the ratio R, the lengths of the first and

second filling portions

20 and 22 may be directly inspected.

Next, in the inspection section 52, it is determined whether or not the inspected ratio R is the predetermined first threshold value T1 (S7: determination step). The first threshold value T1 is set to a predetermined value according to the specifications of the filter 6 or a predetermined allowable range. When the determination result is true (Yes) and R=T1 is established, it is determined that the length in the axial direction X of the first filling portion 20 and the second filling portion 22 is a desired proper value.

In other words, it is determined that the length in the longitudinal direction X of the first crimped region 26 and the second crimped region 28 of the sheet 24 constituting the sheet filling portion 16 is a desired proper value, and the filter 6 is inspected and inspected. Production ends. On the other hand, when the determination result is false (No) and R=T1 does not hold, it is determined that the length in the axial direction X of at least one of the first filling portion 20 and the second filling portion 22 is too long or too short. do.

In other words, it is determined that the length in the longitudinal direction X of the first crimped region 26 and the second crimped region 28 of the sheet 24 forming the sheet filling section 16 is inappropriate. In this case, since the quality of the filter 6 is not ensured, it is necessary to correct the crimping process in the crimping process P1. Inspection section 52 is electrically connected to control unit 58 of sheet processing section 44 .

The inspection section 52 sends the difference between the ratio R and the first threshold T1 to the control unit 58 when it is determined in the determination step S7 that the ratio R is not the first threshold T1. The control unit 58 controls the rotational speed Vr of at least one of the first roller 60 and the second roller 62 based on the difference between the ratio R and the first threshold value T1 (S8: control step). Accordingly, in the sheet processing section 44, the crimping process P1 is performed on the first and second

crimped regions

26, 28 of the sheet 24 to correct the ratio R to the first threshold value T1.

As described above, the filter 6 of the embodiment includes the sheet filling section 16 and the wrapping paper 18 that is wrapped around the sheet filling section 16 . The sheet filling portion 16 is formed by gathering a sheet 24 made of a paper web in the width direction Y and reducing the diameter to the diameter of the filter 6 or less. The sheet 24 constituting the sheet filling portion 16 has a first crimped region 26 in which a predetermined number of crimped portions 30 are formed by crimping a partial region extending in the longitudinal direction X. As shown in FIG.

That is, the sheet filling portion 16 is formed by gathering the first crimped regions 26 having the crimped portions 30 only in a partial region of the sheet 24 in the longitudinal direction X. As a result, in the area adjacent to the first crimped area 26 of the sheet 24 , the number of crimped parts 30 different from that of the first crimped area 26 is formed, or the shape of the crimped parts 30 is different from that of the first crimped area 26 . It is also possible to form the crimped portion 30 or not to form the crimped portion 30 .

By giving the degree of freedom to the crimping process of the sheet 24, it is possible to optimize the porosity and ventilation resistance of the filter 6, so that the smoking taste of the article 1 can be improved. By changing the number and shape of the crimped portions 30 formed on the sheet 24, various variations of the filters 6 can be collectively formed, and the rigidity of the filters 6 can be improved.

In addition, by reducing the number of crimped portions 30 formed in the sheet 24 and reducing the amount of paper dust generated along with the formation of the crimped portions 30, the burden of cleaning the equipment can be reduced, and the filter 6 can be cleaned. Productivity can be improved. In addition, since the sheet filling portion 16 having different crimped patterns can be collectively formed from the continuous sheet 24, there is no need to form the filter 6 by combining separate filter elements having different crimped patterns. Therefore, productivity of the filter 6 is further improved.

Further, when performing the above-mentioned combining, if the length of each filter element in the axial direction X is short, the filter elements may roll during the transport of the filter elements. 6 rejects can occur. However, it is possible to collectively form the sheet filling portions 16 having different crimped forms from the continuous sheet 24, and the combine itself is not required. be able to.

More specifically, the sheet 24 has a second crimped region 28 in a region adjacent to the first crimped region 26 of the sheet 24 in the longitudinal direction X, the second crimped region 28 being the first crimped region. Fewer crimps 30 are formed than in region 26 . As a result, compared with the case where the same number of crimped portions 30 as the first crimped regions 26 are formed over the entire area of the sheet 24, the airflow resistance of the filter 6 can be reduced, the rigidity can be improved, and the productivity can be improved. can be done.

Specifically, by reducing the ventilation resistance of the filter 6, the suction force required when the user sucks the article 1 is reduced, so the amount of flavor component that the user can ingest from the article 1 per puff increases, The absorbency of the article 1 is improved, and thus the smoking taste of the article 1 is improved. Further, when the porosity of the filter 6 increases, there is a risk that the flavor raw material 10 of the flavor element 2 may pass through the voids of the filter 6 and enter the user's mouth when the article 1 is sucked.

However, with the formation of the first filling portion 20 having a large number of crimped portions 30 in the filter 6, the risk of the flavor raw material 10 entering the mouth is reduced, and the quality of the article 1 is improved. In addition, with the formation of the second filling portion 22 having a relatively small number of crimped portions 30, the rigidity of the filter 6, particularly the strength in the radial direction of the filter 6, is improved. The risk of breakage of the filter 6 due to breakage or the like is reduced, and the quality of the article 1 is improved.

In addition, by giving the user the impression that the filter 6 in the article 1 has high rigidity, in other words, that the filter 6 is hard, it is possible to appeal to the user the texture of the article 1 and, by extension, the sense of luxury. Also, the area A1 of the first crimped region 26 is the area adjacent to the first crimped region 26 of the sheet 24 in the longitudinal direction X, that is, the area A2 of the second crimped region 28 or less in the embodiment. Thereby, the length of the first filling portion 20 formed from the first crimped region 26 is less than or equal to the length of the second filling portion 22 formed from the second crimped region 28 .

Here, by setting the length of the first filling portion 20 having a large number of crimped portions 30 to be equal to or less than the length of the second filling portion 22 having a small number of crimped portions 30, the filtration amount of the flavor component in the filter 6 is can be reduced. In particular, the non-combustion-heating type article 1 has a smaller amount of flavor components volatilized by the flavor element 2 than the combustion-heating type article 1 . Therefore, it is preferable to reduce the amount of flavor components filtered by the filter 6 as much as possible.

Therefore, when the filter 6 is used for the non-combustion heating type article 1, the length of the first filling portion 20 is set to be equal to or less than the length of the second filling portion 22. In other words, the area A1 of the first crimped region 26 is set to By setting the area A2 or less of the two-crimped region 28, the amount of flavor components that can be ingested by the user from the article 1 is increased, the absorption of the article 1 is improved, and the smoking taste of the article 1 is improved.

Also, the ventilation resistance per unit length in the axial direction X of the sheet filling portion 16 is 1.5 times or more that of the second filling portion 22 in the first filling portion 20 . As a result, it is possible to provide a certain difference in airflow resistance between the first filling portion 20 and the second filling portion 22. Therefore, by changing the lengths of the first filling portion 20 and the second filling portion 22, the filter It becomes possible to easily optimize the ventilation resistance of the entire 6.

In addition, the first filling section 20 is located downstream of the second filling section 22 in the air flow path and has the mouthpiece end 6 a of the filter 6 . As a result, in the article 1, a clean end surface of the first filling portion 20, which has a large number of crimped portions 30, is densely crimped, and has uniform and small gaps, is exposed as the mouthpiece end 6a. Therefore, the appearance of the article 1 is improved as compared with the case where the gap of the second filling portion 22 is rough and a large end face is exposed.

In addition, since the first filling part 20 is located downstream of the second filling part 22 in the airflow path, the first filling part 20 is separated from the flavor element 2 via the second filling part 22. placed. That is, the first filling section 20 having higher filtration performance than the second filling section 22 is not adjacent to the flavor element 2 . As a result, the flavor components that have just volatilized in the flavor element 2 and have not yet been aerosolized before cooling pass through the first filling section 20 with high filtration performance and are prevented from being excessively filtered. .

As described above, particularly in the non-combustion heating type article 1, the amount of the flavor component volatilized by the flavor element 2 is relatively small, so the first filling section 20 is located downstream of the second filling section 22 in the air flow path. , the amount of the flavor component that can be ingested by the user from the article 1 is increased, the absorption of the article 1 is improved, and the smoking taste of the article 1 is improved.

The sheet processing section 44 of the manufacturing apparatus 40 also includes a roller set 56 having first and

second rollers

60,62. When the roller set 56 conveys the sheet 24 with the sheet 24 sandwiched therebetween, the protrusion 64 of the first roller 60 and the recess 66 of the second roller 62 engage with each other with the sheet 24 interposed therebetween to form an engagement portion 68 in the roller set 56 . be done. The roller set 56 has a first meshing area 70 in which a predetermined number of meshing portions 68 are formed in a partial area of the outer peripheral surface in the circumferential direction Z. As shown in FIG.

The first meshing region 70 forms the first crimped region 26 on the sheet 24 in the crimping process P1 of the sheet processing step S2. Further, the roller set 56 has a second meshing region 72 having fewer meshing portions 68 than the first meshing region 70 in a region adjacent to the first meshing region 70 on the outer peripheral surface in the circumferential direction Z. The second interlocking regions 72 form the second crimped regions 28 in the sheet 24 in the crimping process P1 of the sheet processing step S2.

As a result, the first and second

crimped regions

26 and 28 can be easily formed in the sheet 24 in the process of conveying the sheet 24 , and the sheet filling portion 16 of the filter 6 can be formed with the first and second filling portions 20 . , 22 can be easily formed. Also, the area A3 of the first meshing region 70 is less than or equal to the area A4 of the second meshing region 72 in the region adjacent to the first meshing region 70 on the outer peripheral surface of the roller set 56 . As a result, the area A1 of the first crimped region 26 can be made equal to or smaller than the area A2 of the second crimped region 28 .

Further, the inspection section 52 of the manufacturing apparatus 40 inspects the length ratio R in the axial direction X between the first filling portion 20 and the second filling portion 22 of the sheet filling portion 16 of the filter 6 in the inspection step S6, In determination step S7, it is determined whether or not the ratio R is the first threshold value T1. When it is determined that the ratio R is not the first threshold value T1 in the determination step S7, at least one of the first roller 60 and the second roller 62 is adjusted based on the difference between the ratio R and the first threshold value T1 in the control step S8. to control the rotational speed Vr of the

In the crimping process P1, the sheet 24 may be slightly stretched, and this stretching amount accumulates over a long period of time. There is a risk of causing defects in the article 1, such as being too short or being too short. By performing steps S6 to S8 described above, it is possible to correct defects caused by the stretching of the sheet 24, and to improve the quality of the article 1. FIG.

This completes the description of the embodiment, but the embodiment is not limited and can be modified in various ways without departing from the scope of the invention. For example, the crimp pattern in the first and second

crimped regions

26, 28, the shape of the crimped portion 30, and the areas A1, A2 of the first and second

crimped regions

26, 28 are limited to the above-described embodiment. Various modifications are permitted. As a result, the degree of freedom in the crimping process of the sheet 24 is further increased, so optimization of the ventilation resistance of the filter 6, diversification of the filter 6, improvement of the rigidity of the filter 6, and improvement of the productivity of the filter 6 are more effectively achieved. can be realized.

Specifically, as shown in FIG. 13, the sheet 24 has a non-crimped region 86 in which the crimped portion 30 does not exist in a region adjacent to the first crimped region 26 of the sheet 24 in the longitudinal direction X. can be In this case, as shown in FIGS. 14 and 15, the roller set 56 has a non-engagement region 88 having no engagement portion 68 in a region adjacent to the first engagement region 70 on the outer circumferential surface in the circumferential direction Z. have. The non-engaging regions 88 form the non-crimped regions 86 on the sheet 24 in the sheet processing step S2.

Further, the sheet 24 is crimped in a region adjacent to the first crimped region 26 of the sheet 24 in the longitudinal direction X so that the recessed area becomes smaller than that of the first crimped region 26. It may have a second crimped region 28 with a portion 30 formed therein. For example, in the case shown in FIG. 16, the crimped portion 30 formed in the second crimped region 28 is a dot-shaped recessed portion in a plan view of the sheet 24, specifically a rectangular recessed portion 30b having a rectangular cross section.

In this case, as shown in FIG. 17, a plurality of rectangular protrusions 90 are formed in the second meshing region 72 of the first roller 60 . A plurality of rectangular recesses 92 that mesh with the projections 90 are formed in the second meshing region 72 of the second roller 62 . When the roller set 56 nips and conveys the sheet 24 , the first and

second rollers

60 and 62 rotate, and the convex portion 90 and the concave portion 92 engage with each other through the sheet 24 , forming an engaging portion 68 in the roller set 56 . be done.

As shown in FIG. 18, the meshing portion 68 formed in the second meshing region 72 of the roller set 56 has a smaller meshing area than the first meshing region 70 (see FIG. 10). The second interlocking region 72 is formed into the sheet 24 in the crimping process P1 of the sheet processing step S2 by forming the second crimped region 28 with a plurality of rectangular recesses 30b that provide a smaller recessed area than the first crimped region 26. Form. The second filling portion 22 is formed by gathering the second crimped region 28 .

In the case shown in FIG. 19, the crimped portion 30 formed in the second crimped region 28 is a dot-shaped convex portion in a plan view of the sheet 24, specifically a triangular convex portion 30c having a triangular cross section. . As shown in FIG. 20 , a plurality of rectangular concave portions 94 are formed in the second meshing region 72 of the first roller 60 . A plurality of rectangular protrusions 96 that mesh with the recesses 94 are formed in the second meshing region 72 of the second roller 62 . When the roller set 56 nips and conveys the sheet 24 , the first and

second rollers

60 and 62 rotate, and the concave portion 94 and the convex portion 96 engage with each other through the sheet 24 , forming an engaging portion 68 in the roller set 56 . be done.

As shown in FIG. 21, the meshing portion 68 formed in the second meshing region 72 of the roller set 56 has a smaller meshing area than the first meshing region 70 (see FIG. 10). The second interlocking region 72 forms the second crimped region 28 having a plurality of triangular projections 30c with a smaller convex area than the first crimped region 260 in the crimping process P1 of the sheet processing step S2. to form. The second filling portion 22 is formed by gathering the second crimped region 28 . By making the concave portion 94 a convex portion and the convex portion 96 a concave portion, it is possible to make the triangular convex portion 30c a triangular concave portion.

In the case shown in FIG. 22 , the crimped portion 30 formed in the second crimped region 28 of the sheet 24 is a lateral groove 30 d extending across the width direction Y of the sheet 24 . As shown in FIG. 23 , for example, two ridges 98 extending in the width direction Y are formed in the first meshing region 70 of the first roller 60 . For example, two grooves 100 are formed in the second meshing region 72 of the second roller 62 to mesh with the projections 98 . When the roller set 56 nips and conveys the sheet 24 , the first and

second rollers

60 and 62 rotate, the recessed line 98 and the projected line 100 mesh with each other through the sheet 24 , and the meshing portion 68 is formed in the roller set 56 . It is formed.

As shown in FIG. 24, the meshing portion 68 formed in the second meshing region 72 of the roller set 56 has a smaller meshing area than the first meshing region 70 (see FIG. 10). The second interlocking region 72 is formed in the crimping process P1 of the sheet processing step S2 by forming the second crimped region 28 having, for example, two transverse grooves 30d, which results in a smaller concave area than the first crimped region 26. 24. The second filling portion 22 is formed by gathering the second crimped region 28 .

Furthermore, the type and configuration of the article 1 including the filter 6, and the number, position, and length in the axial direction X of the first and

second filling portions

20 and 22 in the filter 6 are not limited to the described embodiment. Figures 25 to 31 schematically show examples of non-combustion-heated articles 1 different from Figure 1 , these articles 1 comprising non-combustion-heated flavor elements 2 . In the case shown in FIG. 25 , the length of the second filling portion 22 forming the filter 6 is approximately two to three times the length of the first filling portion 20 .

In the case shown in FIG. 26 , the article 1 does not have a tubular element 4 and the length of the second filling section 22 is about seven times the length of the first filling section 20 . In the case shown in FIG. 27 the article 1 further comprises a second filter 104 comprising activated carbon 102 between the tubular element 4 and the filter 6 . Particles of activated carbon 102 are encased in a filter material such as acetate tow in a second filter 104 . In the case shown in FIG. 28, the article 1 further comprises a third filter 108 with a capsule 106 arranged downstream of the filter 6 in the airflow path. Capsules 106 contain additives such as flavoring liquids, and capsules 106 are wrapped in a filter material such as acetate tow at third filter 108 .

In the case shown in FIG. 29, the sheet filling section 16 has a plurality of sets, for example, two sets of the second filling section 22 and the first filling section 20 arranged alternately in this order from the upstream side of the airflow path in the axial direction X. It is formed. In the case shown in FIG. 30 the article 1 does not comprise a tubular element 4 and the sheet filling section 16 has a second filling section 22 between two first filling sections 20 . The length of the second filling portion 22 is approximately four times the length of the first filling portion 20 .

In the case shown in FIG. 31, the article 1 includes two filters 6, the second filling portions 22 are positioned on the left and right outer sides in the axial direction X across the tubular element 4, and the second filling portions 22 are arranged in the axial direction X. The first filling part 20 is positioned on the left and right outside of the . The second filling portion 22 having a small number of crimped portions 30 or having a small concave area increases the strength of the filter 6 in the radial direction. On the other hand, the first filling portion 20 having a large number of crimped portions 30 or having a large concave area increases the buckling strength of the filter 6 in the axial direction X. As shown in FIG. Therefore, depending on the configuration of the article 1, the first filling section 20 may be positioned upstream of the second filling section 22 in the air flow path.

On the other hand, the filter 6 of the embodiment can also be applied to the combustion heating type article 1. Figures 32 to 35 schematically show examples of combustion-heated articles 1, which comprise flavor elements 2 that are heated by combustion upon ignition, but without tubular elements 4. In the case shown in FIG. 32 , the length of the second filling portion 22 is approximately four times the length of the first filling portion 20 .

In the case shown in FIG. 33 , the length of the first filling section 20 is longer than that of the second filling section 22 . As shown in FIG. 34, article 1 further comprises a second filter 104 containing particles of activated carbon 102 between flavor element 2 and filter 6 . Also, the length of the first filling portion 20 is about twice the length of the second filling portion 22 . In the case shown in FIG. 35, the article 1 further comprises a third filter 108 with a capsule 106 arranged downstream of the filter 6 . Also, the length of the first filling portion 20 is longer than that of the second filling portion 22 .

The combustion heating type article 1 has a larger amount of flavor components volatilized by the flavor element 2 than the non-combustion heating type article 1 . Therefore, there is less need to reduce the amount of flavor components filtered by the filter 6 . Therefore, especially when the filter 6 is used for the combustion heating type article 1, the length of the first filling portion 20 is changed as shown in FIGS. It may be longer than the length of the second filling portion 22 , in other words, the area A1 of the first crimped region 26 may be larger than the area A2 of the second crimped region 28 .

Also, a plurality of roller sets 56 may be provided in the sheet processing section 44, three or more crimped regions may be formed in the sheet 24, and three or more filling portions of the sheet 24 may be formed in the sheet filling portion 16. Also good. Also, the sheet 24 may be formed from a web material other than a paper web.

REFERENCE SIGNS LIST 1 flavor suction article 2 flavor element 4 tubular element 6 filter 16 sheet filling part 18 wrapping paper 20 first filling part 22 second filling part 24 sheet 26 first crimped area 28 second crimped area 30 crimped part 30a vertical grooves (Crimped part)
30b Rectangular concave portion (dot-shaped concave portion, crimped portion)
30c Triangular convex portion (dot-shaped convex portion, crimped portion)
30d Horizontal groove (crimped portion)
40 Manufacturing device 44 Sheet processing section 46 Gathering section 48 Wrapping section 50 Cutting section 54 Conveyance path 56 Roller set 60 First roller 62 Second roller 64 Protrusions (protrusions) of the first roller
66 concave streak (concave portion) of the second roller
74 sheet filling rod 76 filter rod 86 non-crimped region 90 convex portion of first roller 92 concave portion of second roller 94 concave portion of first roller 96 convex portion of second roller 98 convex strip (convex portion) of first roller
100 concave streak (concave portion) of the second roller
102 Activated carbon 104 Second filter 106 Capsule 108 Third filter A1 Area of first crimped region A2 Area of region (second crimped region or non-crimped region) adjacent to first crimped region of sheet A3 First engagement Area of area A4 Area of area (second meshing area or non-engaging area) adjacent to first meshing area of outer peripheral surfaces of first roller and second roller P1 Crimping process R Ratio S2 Sheet processing step S3 Gathering step S4 Wrapping Step S5 Cutting step S6 Inspection step S7 Judgment step S8 Control step T1 First threshold value X Longitudinal direction of sheet, axial direction of filter, conveying direction of sheet, sheet filling rod and filter Y Width direction of sheet Z First roller and second roller Circumferential direction of roller outer surface

Claims

A filter for use in flavor suction articles,
a sheet filling portion formed by gathering a sheet made of a web material in a width direction that intersects with the longitudinal direction of the sheet so as to reduce the diameter to a diameter equal to or less than the diameter of the filter;
and a wrapping paper wrapped in the sheet filling unit,
A filter, wherein the sheet has a first crimped region in which a predetermined number of crimped portions are formed by crimping a partial region extending in the longitudinal direction.
In the sheet, regions adjacent to the first crimped regions of the sheet in the longitudinal direction are crimped to form a smaller number of crimped portions than in the first crimped regions. 2. The filter of claim 1, having a second crimped region that is crimped.
The filter according to claim 1, wherein the sheet has a non-crimped region in which the crimped portion is absent in a region adjacent to the first crimped region of the sheet in the longitudinal direction.
In the sheet, a region adjacent to the first crimped region of the sheet in the longitudinal direction is subjected to a crimping treatment, so that the crimped portion has a concave area smaller than that of the first crimped region. 2. The filter of claim 1, having a second crimped region formed with a .
The filter according to any one of claims 1 to 4, wherein the area of the first crimped region is equal to or smaller than the area of the region adjacent to the first crimped region of the sheet in the longitudinal direction.
The first crimped region forms a first filling portion in the sheet filling portion,
a region adjacent to the first crimped region of the sheet in the longitudinal direction forms a second filling portion adjacent to the first filling portion in the sheet filling portion;
The filter according to any one of claims 1 to 5, wherein the length in the axial direction of the first filling portion is equal to or less than the length in the axial direction of the second filling portion.
The first crimped region forms a first filling portion in the sheet filling portion,
a region adjacent to the first crimped region of the sheet in the longitudinal direction forms a second filling portion adjacent to the first filling portion in the sheet filling portion;
7. The sheet filling portion according to any one of claims 1 to 6, wherein the airflow resistance per unit length in the axial direction of the sheet filling portion is 1.5 times or more of the second filling portion in the first filling portion. filter.
The first crimped region forms a first filling portion in the sheet filling portion,
a region adjacent to the first crimped region of the sheet in the longitudinal direction forms a second filling portion adjacent to the first filling portion in the sheet filling portion;
The filter according to any one of claims 1 to 7, wherein the sheet filling section has a plurality of sets of the first filling section and the second filling section in its axial direction.
The filter according to any one of claims 1 to 8, wherein at least part of said crimped portion is a vertical groove extending in said longitudinal direction of said sheet.
The filter according to any one of Claims 1 to 9, wherein at least part of the crimped portion is a dot-shaped concave portion or convex portion in a plan view of the sheet.
The filter according to any one of claims 1 to 10, wherein at least a portion of said crimped portion is a horizontal groove extending across said width direction of said sheet.
The filter according to any one of claims 1 to 11, wherein said web material is a paper web.
A flavor suction article comprising the filter according to any one of claims 1 to 12.
A flavor inhalation article according to claim 13, further comprising a tubular element.
The flavor inhalation article according to claim 13 or 14, further comprising a second filter containing activated carbon.
The flavor inhalation article according to any one of claims 13 to 15, further comprising a third filter in which a capsule containing an additive is arranged.
The flavor inhalation article according to any one of claims 13 to 16, comprising a non-combustible heated flavor element.
A flavor inhalation article according to any one of claims 13 to 17, comprising a flavor element that is heated by combustion.
A filter manufacturing device for use in flavor inhaling articles,
a sheet processing section for processing a series of sheets of web material as they are transported through a transport path;
A sheet filling rod that gathers the sheet processed in the sheet processing section in a width direction that intersects the longitudinal direction of the sheet in the course of conveying the sheet in the conveying path, and reduces the diameter to a diameter equal to or less than the diameter of the filter. a gathering section forming a
a wrapping section for wrapping the sheet filling rod formed in the gathering section with wrapping paper to form a filter rod;
a cutting section for cutting the filter rod formed in the wrapping section into the filter;
The sheet processing section includes a roller set for sandwiching and conveying the sheet in the conveying path by a first roller and a second roller,
The first roller is formed with a convex portion that protrudes over a part of the outer peripheral surface in the circumferential direction,
The second roller has a concave portion that engages with the convex portion over a part of the outer peripheral surface in the circumferential direction,
In the roller set, when the sheet is sandwiched and conveyed, the convex portion and the concave portion form a meshing portion that meshes with the sheet interposed therebetween. Having a first meshing region in which a predetermined number of the meshing portions are formed,
The first meshing region is a first crimped region having a predetermined number of crimped portions corresponding to the number of meshing portions by crimping a partial region of the sheet extending in the longitudinal direction. Forming a filter manufacturing device.
The roller set has a second meshing region having a smaller number of meshing portions than the first meshing region in a region of the outer peripheral surface adjacent to the first meshing region in the circumferential direction of the outer peripheral surface. ,
The second meshing region is formed by crimping a region adjacent to the first crimped region of the sheet in the longitudinal direction, so that the number of the crimps is smaller than that of the first crimped region. 20. The filter manufacturing apparatus of claim 19, forming a second crimped region having a portion.
The roller set has a non-engagement region that does not have the engagement portion in a region adjacent to the first engagement region of the outer peripheral surface in the circumferential direction of the outer peripheral surface,
20. The filter manufacturing apparatus according to claim 19, wherein the non-engaging region forms a non-crimped region where the crimped portion does not exist in a region adjacent to the first crimped region of the sheet in the longitudinal direction. .
The roller set has a second meshing region in a region adjacent to the first meshing region of the outer peripheral surface in the circumferential direction of the outer peripheral surface, the meshing area of the meshing portion being smaller than that of the first meshing region. death,
The second meshing region has a concave area smaller than that of the first crimped region by crimping a region adjacent to the first crimped region of the sheet in the longitudinal direction. 20. The filter manufacturing apparatus according to claim 19, which forms a second crimped region having a crimped portion.
The filter manufacturing apparatus according to any one of claims 19 to 22, wherein the area of the first meshing region is equal to or less than the area of the region of the outer peripheral surface adjacent to the first meshing region.
A method for manufacturing a filter for use in a flavor inhaling article, comprising:
a sheet processing step for processing a sheet of web material as it is conveyed;
In the process of conveying the sheet, the sheet processed in the sheet processing step is gathered in the width direction intersecting the longitudinal direction of the sheet to form a sheet filling rod having a diameter smaller than the diameter of the filter. a step;
a wrapping step of wrapping the sheet filling rod formed in the gathering step with wrapping paper to form a filter rod;
a cutting step of cutting the filter rod formed in the wrapping step into the filter;
In the sheet processing step, a first crimped region having a predetermined number of crimped portions is formed by performing a crimping process on a partial region of the sheet extending in the longitudinal direction while the sheet is conveyed. A method of manufacturing a filter comprising a crimping process to form.
In the crimping process, a region adjacent to the first crimped region of the sheet in the longitudinal direction is subjected to a crimping treatment so that the number of the crimped portions is smaller than that of the first crimped region. 25. The method of making a filter of claim 24, forming a second crimped region having:
In the crimping process, a region adjacent to the first crimped region of the sheet in the longitudinal direction is crimped so that the crimped region has a smaller concave area than that of the first crimped region. 25. A method of making a filter according to claim 24, comprising forming a second crimped region having a crimp.
In the sheet processing step, the crimping process is performed using a roller set in which the sheet is sandwiched and conveyed in a conveying path by a first roller and a second roller;
the filter formed in the cutting step has a sheet filling portion formed by cutting the sheet filling rod;
The first crimped region forms a first filling portion in the sheet filling portion,
a region adjacent to the first crimped region of the sheet in the longitudinal direction forms a second filling portion adjacent to the first filling portion in the sheet filling portion;
an inspection step of inspecting the length ratio in the axial direction between the first filling portion and the second filling portion;
a determination step of determining whether the ratio inspected in the inspection step is a predetermined first threshold;
When it is determined in the determination step that the ratio is not the first threshold value, in the crimping process, at least the first roller and the second roller are adjusted based on the difference between the ratio and the first threshold value. 27. The method of manufacturing a filter according to any one of claims 24 to 26, further comprising a control step of controlling one rotational speed.