WO2014080516A1

WO2014080516A1 - Method for producing filter cigarette, filter, and filter cigarette

Info

Publication number: WO2014080516A1
Application number: PCT/JP2012/080465
Authority: WO
Inventors: 貞雄小城
Original assignee: 日本たばこ産業株式会社
Priority date: 2012-11-26
Filing date: 2012-11-26
Publication date: 2014-05-30
Also published as: EP3254570B1; JP5877570B2; EP3254570A1; EP2893820A4; EP2893820B1; JPWO2014080516A1; EP2893820A1

Abstract

A method for producing a filter cigarette comprises: a core fiber processing step of adding a plasticizer to a core fiber (4) having a total fineness of 23000 to 70000 deniers so that the addition rate becomes 13 to 40%; a sheath fiber processing step of adding a plasticizer to a sheath fiber (5) having a total fineness of 10000 to 47000 deniers so that the addition rate becomes 15% or less, or adding no plasticizer to the sheath fiber (5) so that the addition rate becomes 0%; subsequent to the core fiber processing step and the sheath fiber processing step, a hollow filter formation step of hardening the core fiber (4) to form a core part (11a) having, formed therein, a pore part (10) that extends from one end surface of the core fiber (4) toward the other end surface of the core fiber (4), and then covering the outside of the core part (11a) with the sheath fiber (5) to form a hollow filter (11) as a sheath part (11b); subsequent to the hollow filter formation step, a post-treatment step of conveying the hollow filter (11) while allowing the hollow filter (11) to pass through a narrow part that is narrower than the diameter of the hollow filter (11) and is larger than the diameter of the core part (11a).

Description

Filter cigarette manufacturing method, filter and filter cigarette

The present invention relates to a filter cigarette manufacturing method, a filter, and a filter cigarette.

2. Description of the Related Art A filter manufacturing machine that manufactures a hollow filter having a through hole formed in the axial direction is known (see, for example, Patent Document 1). A filter in which such through-holes are formed has a heavier weight of cellulose acetate tow than a normal filter, and further has a high proportion of plasticizer added to cellulose acetate tow. Thereby, sufficient hardness is given to the filter and the shape of the through hole is maintained.

International Publication No. 2011/114440

However, the manufactured hollow filter needs to be conveyed while being crushed in a passage narrower than the diameter of the filter in the subsequent process, for example, the process of winding the chip paper to connect with the cigarette. At this time, the shape of the through hole at the end of the filter may change. In particular, the filter mounting device for winding the chip paper is provided with a convex portion protruding toward the passage in order to give a trigger of rotation for the purpose of reliably sending the filter to the passage. When the manufacturing capability of the apparatus is improved and the conveying speed of the filter is increased, the problem of the change in the shape of the through hole becomes significant when the filter passes through the convex portion.

The present invention has been made in consideration of the above-mentioned problems, and a filter cigarette manufacturing method capable of reducing a through-hole shape change even when the hollow filter is crushed in a subsequent process of manufacturing a filter cigarette using a hollow filter. An object of the present invention is to provide a filter and a filter cigarette.

In order to achieve the above object, in the present invention, a core fiber processing step in which a plasticizer is added to a core fiber having a total fineness of 23,000 denier to 70000 denier to an addition rate of 13% to 40%, and a total fineness of 10,000 denier to 47,000 denier. A sheath fiber processing step in which a plasticizer is added to the sheath fiber to reduce the addition rate to 15% or less, or the addition rate is 0% without adding a plasticizer, the core fiber processing step, and the sheath fiber processing step After that, the core fiber is cured to form a core portion having a hole extending from one end surface toward the other end surface, and the outer portion of the core portion is covered with the sheath fiber to form a hollow filter as a sheath portion. After the hollow filter forming step to be formed and the hollow filter forming step, the hollow filter is narrower than the diameter of the hollow filter and is equal to the diameter of the core part. Conveyed by passing also large narrow portion, to provide a filter cigarette manufacturing method comprising the subsequent step.

In the present specification, the plasticizer addition rate (%) is defined by a calculation formula of (plasticizer weight / tow (fiber) weight) × 100.
Denier (g / 9000 m) × 0.1111 = tex (g / 1000 m).

Preferably, the addition rate of the plasticizer to the core fiber is 13% to 35%, and the addition rate of the plasticizer to the sheath fiber is about 3% to 12%.

Preferably, the post-process is directed toward the inside of the rolling passage in order to provide an opportunity to roll the hollow filter and the cigarette when the hollow filter and the cigarette are introduced into the rolling passage. A filter mounting step of connecting the hollow filter and the cigarette by passing a narrow portion formed with a projecting convex portion, winding a tip paper around the hollow filter and the cigarette in the rolling passage.

The present invention also includes a cylindrical hollow filter in which a hole extending from one end surface toward the other end surface is formed, and an adsorption filter continuously connected to the hollow filter in the longitudinal direction. The hollow filter has a core portion in which a hole extending from one end face toward the other end face is formed, and a sheath portion covering the outside of the core portion, and between the core portion and the sheath portion. The core portion has a total fineness of 23,000 denier to 70000 denier, a plasticizer addition rate of 13% to 40%, and the sheath portion has a total fineness of 10,000 denier to 47,000. There is provided a filter having a plasticizer addition rate of 0% to 15%.

Furthermore, the present invention includes a cylindrical hollow filter in which a hole extending from one end surface toward the other end surface is formed, and an adsorption filter continuously connected to the hollow filter in the longitudinal direction. The hollow filter has a core portion in which a hole extending from one end face toward the other end face is formed, and a sheath portion covering the outside of the core portion, and between the core portion and the sheath portion. There is a boundary line, the core portion has a hardness of 0 mm / 10 or more and less than 5 mm / 10, and the sheath portion has a hardness of 5 mm / 10 or more and 10 mm / 10 or less. Provide a filter.

Preferably, the core portion has a total fineness of 23000 denier to 70000 denier and a plasticizer addition rate of 13% to 40%, and the sheath portion has a total fineness of 10,000 denier to 47000 denier. The addition rate is 0% to 15%.

Also, the present invention provides a filter cigarette comprising the filter, a cigarette in which chopped cigarettes are wrapped with a wrapping paper, and chip paper that wraps the filter and the cigarettes and connects them in the longitudinal direction.

In the present invention, even if the hollow filter is crushed in a subsequent process of manufacturing a filter cigarette using the hollow filter, the shape change of the through-hole can be reduced.

It is the schematic of a filter cigarette manufacturing machine. It is the schematic of a hole forming apparatus. It is the schematic of a hollow filter. It is a schematic sectional drawing of a filter cigarette. It is a flowchart of a filter cigarette manufacturing method. It is the schematic of a filter mounting apparatus. It is the schematic which shows the rolling channel | path part with which a filter mounting apparatus is equipped. It is the schematic which shows an example of the cross section of a hollow filter. It is the schematic which shows an example of the cross section of a hollow filter. It is the schematic which shows an example of the cross section of a hollow filter. It is the schematic which shows an example of the cross section of a hollow filter. It is the schematic which shows the other example of a hollow filter. It is explanatory drawing when measuring the hardness of a hollow filter. It is explanatory drawing of a pressurization test. It is a table | surface which shows the specification of each sample which performed the pressurization test. It is a graph which shows the result of a pressurization test.

First, the filter cigarette manufacturing machine 1 used for filter manufacturing will be described. As shown in FIG. 1, the filter cigarette making machine 1 has first and

second feeding paths

2 and 3 in which the core fiber 4 and the sheath fiber 5 are continuously drawn out in the direction of the arrow in the figure and travel. Yes. The arrows shown along the

feeding paths

2 and 3 in FIG. 1 indicate the traveling directions of the core fiber 4 and the sheath fiber 5. For example, a core fiber 4 and a sheath fiber 5 made of cellulose acetate fiber are bundled at the start ends of the

feeding paths

2 and 3, respectively, as a tow bail 28. Each

feeding path

2, 3 is guided by a guide 36 or a guide roller 6. The first unwinding path 2 is provided with a first fiber opening and plasticizer addition device 7. In the first fiber opening and plasticizer addition device 7, the core fiber 4 traveling on the first feeding path 2 is opened using a known banding jet, a pair of pretension rollers, a pair of blooming rollers, and the like. Then, a plasticizer is added to the opened core fiber 4 using a known spray spray or the like. A second opening and plasticizer addition device 8 having the same function as the first opening and plasticizer addition device 7 is also provided in the second feeding path 3 along which the sheath fiber 5 travels.

The first and

second feeding paths

2 and 3 are connected to the hole forming device 9. The hole forming device 9 (see FIG. 2) will be described later. In the hole forming device 9, the hollow filter intermediate 54 in which the through holes 10 are formed in the longitudinal direction is manufactured. The hollow filter intermediate 54 is sent to the paper winding device 13 through the conveyance path 12. In practice, the hollow filter intermediate body 54 is manufactured by passing through the trumpet guide 18 provided on the inlet side of the paper winding device 13. In this specification, the trumpet guide 18 is handled as a part of the hole forming device 9 for convenience. . In the paper winding device 13, the hollow filter intermediate 54 is wrapped with the web 30 (see FIG. 4) to become the hollow filter 11 (see FIG. 3). Further, after the hollow filter 11 is cut by the paper winding device 13, the entire outer periphery is wrapped with the forming paper 32 (see FIG. 4) in a state of being arranged in the longitudinal direction with the adsorption filter 31 that adsorbs the components in the smoke. Then, the hollow filter 11 and the adsorption filter 31 wrapped with the molding paper 32 become the filter 22 (see FIG. 4), and are sent to the filter mounting device 14 and connected to the cigarette 16 via the chip paper 15. In addition, the hollow filter 11 may adsorb | suck the component in smoke, and does not need to be able to adsorb | suck the component in smoke substantially.

As described above, the hollow filter intermediate 54 is manufactured by the hole forming apparatus 9. As shown in FIG. 2, the hole forming device 9 includes a forming tube 17, a trumpet guide 18, and a mandrel 19. One end of the mandrel 19 is supported by the support base 20 and extends into the forming tube 17 from the inlet side of the core fiber 4. The forming tube 17 has a hollow cylindrical shape, and the trumpet guide 18 has a hollow cylindrical shape with an enlarged diameter on the inlet side, and allows the sheath fiber 5 to pass along with the core fiber 4 while narrowing down.

The core fiber 4 that has passed through the first fiber opening and plasticizer addition device 7 enters the forming tube 17. The core fiber 4 passes through a passage formed by the molding tube 17 and the mandrel 19 in cooperation with each other. The core fiber 4 is heat-treated in the molding tube 17 and has a through hole 10 along the outer shape of the mandrel 19 in the longitudinal direction. It becomes the hollow cylindrical core part 11a.

This heat treatment is performed in the heat treatment unit 50. The heat treatment unit 50 is provided as a hole 51 that penetrates the peripheral wall of the molded tube 17, and steam is blown into the molded tube 17 through the hole 51. By the heat treatment unit 50, the core fiber 4 is plasticized and hardened in the process of passing through the molding tube 17. In addition to steam, a new heat source such as microwave, high-temperature air, or heating wire may be used.

In addition, in order to make it easy to flow in the core fiber 4 stably, the diameter of the inlet side of the 1st shaping | molding pipe | tube 17 is expanded gradually. In the example of FIG. 2, the inlet side of the first molded tube 17 is curved.

Further, a plasticizer may be added from the inside before the core fiber 4 enters the forming tube 17. For example, a part of the support 20 can be made into a spray nozzle, and a plasticizer can be added from this nozzle (arrow S in FIG. 2). By adding the plasticizer from such a position, the plasticizer is supplied toward the portion to be the surface of the through-hole 10, so that the surface of the through-hole 10 can be appropriately cured. In addition, since the plasticizer is locally added from the support base 20, the core fiber 4 can be sufficiently cured with a small amount of plasticizer. If the surface of the through hole 10 is cured in this way, for example, when the hollow filter 11 is cut, the through hole 10 can be prevented from being crushed by the cut surface.

A trumpet guide 18 having the same axis as the forming tube 17 is disposed on the outlet side of the forming tube 17. The core portion 11 a formed by the forming tube 17 is drawn out as it is and flows into the trumpet guide 18. The sheath fiber 5 that has passed through the second opening and plasticizer addition device 8 enters the trumpet guide 18. Since the sheath fiber 5 passes through a passage formed by the trumpet guide 18 and the core portion 11a in cooperation, the sheath fiber 5 becomes a sheath portion 11b that covers the outside of the core portion 11a. After that, the hollow filter intermediate 54 is wrapped with the web 30 on the ganiche belt 55 to become the hollow filter 11.
In addition, in order to make it easy to see the state of the sheath portion 11b covering the outside of the core portion 11a, the web 30 on the ganiche belt 55 is not shown in FIG.

As shown in FIG. 3, the hollow filter 11 thus formed has a two-layer structure having a core portion 11a as an inner cylinder and a sheath portion 11b as an outer cylinder. The core portion 11 a and the sheath portion 11 b are clearly separated by a boundary line 21 in the cross section of the hollow filter 11. If the hollow filter 11 has a normal size, the diameter can be 7.4 mm to 8.0 mm, and the diameter of the core portion 11a can be 4.6 mm to 5.2 mm. In the case of the hollow filter 11 used in a thin type cigarette, the diameter may be 5.0 mm to 7.3 mm, and the diameter of the core portion 11a may be 2.4 mm to 4.7 mm. Further, the diameter of the core portion 11a of the hollow filter 11 having a diameter of 7.4 mm to 8.0 mm can be set to 2.4 mm to 4.7 mm. Such a hollow filter 11 is manufactured through the following manufacturing method (see FIG. 5).

First, a core fiber processing step is performed (step S1). The core fiber processing step is performed using the first fiber opening and plasticizer addition device 7. The total fineness of the core fiber 4 is set to 23000 denier to 70000 denier (2555.3 tex to 7777 tex). A cellulose acetate fiber etc. can be used for a fiber. From here, the core fiber 4 fed to the first feeding path 2 is opened, and a plasticizer is added at an addition rate of 13% to 40% (preferably 15 to 35%, most preferably 17 to 30%). The addition rate of the plasticizer is a value determined by the sum of the first fiber opening and the addition by the plasticizer addition device and the local addition from the support base 20. On the other hand, a sheath fiber processing step is performed (step S2). The sheath fiber processing step is performed using the second fiber opening and plasticizer addition device 8. The total fineness of the sheath fiber 5 is set to 10,000 denier to 47,000 denier (1888.7 tex to 2999.7 tex). A cellulose acetate fiber etc. can be used for a fiber. From here, the sheath fiber 5 fed to the second feeding path 3 is opened, and a plasticizer is added at an addition rate of 15% or less (preferably 3 to 12%, most preferably 6 to 9%). Alternatively, a plasticizer may not be added.

And a hollow filter formation process is performed (step S3). This hollow filter forming step is performed using the hole forming apparatus 9. In the hole forming device 9, as described above, the core fiber 4 is a cylindrical core portion 11a in which the through hole 10 is formed in the longitudinal direction, and the outside of the core portion 11a is covered with the sheath fiber 5 to form a sheath portion 11b. The hollow filter 11 is formed by wrapping with a web 30.

Such a hollow filter 11 is subjected to a filter mounting step (step S4) as an example of a post-process. First, the filter mounting device 14 used in this step will be described. That is, in order to manufacture the filter cigarette 27 using the hollow filter 11, a filter mounting device 14 as shown in FIG. 6 is used. In this filter mounting device 14, a filter plug 37 is first disposed between two cigarettes 16. This filter plug 37 is formed with a length of two filters 22 with the adsorption filter 31 positioned on both sides. Thereby, the intermediate product 25 of the double filter cigarette 49 is formed. Thereafter, the chip paper 15 having an adhesive applied on one side is wound around the intermediate product 25 to form a double filter cigarette 49. Here, the filter mounting device 14 includes a transport path 39 formed by the first transport drum 38 and the second transport drum 23. That is, the transport path 39 for the intermediate product 25 is formed by the first transport drum 38 rotating in the direction of arrow R1 and the second transport drum 23 rotating in the direction of arrow R2. The conveyance path 39 is a path along which the intermediate product 25 is conveyed. The first transport drum 38 forms an upstream portion of the transport path 39, and the second transport drum 23 forms a downstream portion.

The first transport drum 38 is also called a swash plate drum. The second transport drum 23 is also called a rolling drum. Both the first conveyance drum 38 and the second conveyance drum 23 have a plurality of adsorption grooves (not shown) that adsorb while accommodating a part of the intermediate product 25 on the outer periphery. The intermediate products 25 are accommodated one by one in the suction grooves and conveyed in the circumferential direction of the first conveyance drum 38 and the second conveyance drum 23.

On the other hand, a supply drum 40 that rotates in the direction of arrow R3 is disposed adjacent to the first transport drum 38. The chip paper 15 is unwound from the supply drum 40, and one side edge of the chip paper 15 is affixed to the intermediate product 25 that is transported along the first transport drum 38. A guide member 24 is disposed adjacent to the second transport drum 23 along the circumferential direction thereof. The guide member 24 rolls the intermediate product 25 in cooperation with the second transport drum 23 and winds the chip paper 15 around the intermediate product 25.

The filter mounting process (step S4) as an example of a post-process for actually winding the chip paper 15 around the intermediate product 25 using the filter mounting apparatus 14 having the above structure will be described in order. The double cigarette DS having a length corresponding to two cigarettes manufactured by a known means is cut into two cigarettes 16 in the process of transporting the cigarette DS (arrow F1 in FIG. 6). Thereafter, these two cigarettes 16 are separated in the axial direction to form a cigarette row (arrow F2 in FIG. 6). Then, the cigarette row is supplied to the first transport drum 38 (arrow F3 in FIG. 6).

On the other hand, the above-described filter plugs 37 are aligned in a row through a grading process in the transport direction, and then supplied to a first transport drum (swash plate drum) 38 through an acceleration drum 41 that rotates in the direction of arrow R4.

The above-described cigarette row has an interval in which the filter plug 37 can be received between the cigarettes 16 and is supplied to the first transport drum 38 while maintaining this interval. When the cigarette row is supplied to the first transport drum 38, it is aligned on the same axis as the filter plug 37. The first transport drum 38 is provided with a pair of floating disks (not shown) on both sides. As the first transport drum 38 rotates, each cigarette 16 is sandwiched between the floating disks on both sides, and the distance between them in the axial direction. Packed. Thereby, the intermediate product 25 of the double filter cigarette in which the filter plug 37 is positioned between the two cigarettes 16 is formed.

On the other hand, a tip paper web W is fed out from a tip paper roll (not shown) (in the direction of arrow E in FIG. 6). The web W is guided to a supply drum (coke drum) 40. An adhesive (glue) is applied to one side of the web W before the supply drum 40. Specifically, an adhesive roller 42 is disposed at a position in front of the supply drum 40, and the adhesive roller 42 rotates with its lower half immersed in the adhesive liquid 43. A transmission roller 44 is disposed adjacently above the adhesive roller 42, and the adhesive adhering to the outer peripheral surface of the adhesive roller 42 is transferred to the outer peripheral surface of the transmission roller 44 with a predetermined layer thickness. As the web W passes, the transmission roller 44 rolls on one side and applies an adhesive according to a predetermined application pattern.

The supply drum 40 has a suction surface on its outer periphery, and rotates while holding the web W on this suction surface. A bladed drum 45 is disposed adjacent to the supply drum 40. The bladed drum 45 has a number of coke knives (not shown) on its outer periphery. These coke knives are arranged at regular intervals, and rotate in synchronization with the supply drum 40 as the bladed drum 45 rotates. The web W is cut into chip paper 15 on the suction surface of the supply drum 40 by these rotating coke knives.

The chip paper 15 rotates while being sucked and held by the supply drum 40 and is supplied to the intermediate product 25 on the first transport drum 38. A gap between the supply drum 40 and the first transport drum 38 is formed as a pasting passage 46. The chip paper 15 is attached to the outer surface of the intermediate product 25 from the leading portion thereof, and is conveyed on the first conveyance drum 38 together with the intermediate product 25. The intermediate product 25 is transferred from the first transport drum 38 to the second transport drum (rolling drum) 23 with the chip paper 15 attached. A transfer passage 47 is formed between the first transfer drum 38 and the second transfer drum 23. The intermediate product 25 is transported between the guide member 24 as the second transport drum 23 rotates.

The guide member 24 extends along the rotation direction of the second transport drum 23. A rolling passage 26 of the intermediate product 25 is formed between the outer periphery of the second transport drum 23 and the guide member 24, and the rolling passage 26 is curved along the outer periphery of the second transport drum 23. Yes. By passing through the rolling passage 26, the chip paper 15 is wound around the intermediate product 25, and the double filter cigarette 49 is manufactured. Then, the filter cigarette 27 in which the hollow filter 11 is positioned on the end surface on the mouth end side is manufactured by cutting the double filter cigarette 49 at the location of the hollow filter 11.

Here, a narrow portion 48 (for example, affixed to the conveyance path 39) is narrower than the diameter of the filter plug 37, that is, the hollow filter 11, which is conveyed as a part of the intermediate product 25, and larger than the diameter of the core portion 11a. There are passages 46, delivery passages 47, rolling passages 26). For example, in the affixing passage 46, the chip paper 15 needs to be a little compressed in the radial direction and affixed, and the

drums

38 and 23 adsorb the intermediate product 25 by air suction. It is necessary to ensure the delivery of the intermediate product 25 without causing air leakage by compressing the intermediate product 25 in the radial direction. Further, in the rolling passage 26, it is necessary to roll the tip paper 15 securely by rolling the intermediate product 25 while compressing the intermediate product 25 in a radial direction to some extent. As described above, the narrow portion 48 is required in the transport path 39 for some purpose.

Also, on the entrance side of the guide member 24 in the conveyance direction, a convex portion 29 is provided so as to project the rolling of the intermediate product 25 to the rolling passage 26 side. By passing through the rolling passage 26, the chip paper 15 of the intermediate product 25 is wound, and a double filter cigarette 49 using the hollow filter 11 is manufactured.

As shown in FIG. 4, the filter cigarette 27 using the hollow filter 11 has a filter 22, and the hollow filter 11 is used on the mouth end side of the filter 22. An adsorption filter 31 is continuously connected in the longitudinal direction of the hollow filter 11. The hollow filter 11 and the adsorption filter 31 are each wrapped in a web 30. The hollow filter 11 and the adsorption filter 31 are both integrated with a molding paper 32. The cigarette 16 is formed by wrapping a cigarette 33 with a wrapping paper 34. As described above, the filter 22 and the cigarette 16 are connected via the chip paper 15 and integrated.

In the filter cigarette 27, the core portion 11a has a hardness of 0 mm / 10 to 5 mm / 10, and the sheath portion 11b has a hardness of 5 mm / 10 to 10 mm / 10. That is, the core portion 11a has a high hardness, and the sheath portion 11b has a low hardness. And the diameter of the core part 11a is smaller than the width | variety of a narrow part. As a specific example, the post-process is a filter mounting process using the filter mounting device 14. In particular, the portion provided with the convex portion 29 in the introduction portion of the rolling passage 26 described above has a narrow passage width, but the diameter of the core portion 11a is smaller than the width of the conveyance passage in the portion where the convex portion 29 is provided. .

As described above, the core portion 11a and the sheath portion 11b are set so that the core portion 11a is hardened and the sheath portion 11b is softened by changing the total fineness and the addition rate of the plasticizer. Even if the sheath portion 11b is crushed during passage, the sheath portion 11b absorbs external pressure, and the pressure applied to the core portion 11a is reduced. Therefore, the shape change of the through hole 10 can be reduced. Further, since at least the diameter of the core portion 11a is smaller than the width of the narrow portion 48, the through hole 10 is not directly crushed. For example, as shown in FIG. 7, when the hollow filter 11 passes through the intermediate product 25, that is, the rolling passage 26 (narrow portion 48) whose width is narrower than the diameter of the hollow filter 11, the sheath portion 11 b is directly crushed. However, the core portion 11a is not directly crushed.

This effect is particularly useful when passing through the convex portion 29 provided in the introduction portion of the rolling passage 26 of the filter mounting device 14. This is because this portion is particularly narrow in the narrow portion 48 narrower than the diameter of the hollow filter 11. Further, the core portion 11 a and the sheath portion 11 b are clearly separated via a boundary line 21 in a cross-sectional view of the hollow filter 11. Therefore, compared with the so-called gradation layer in which the core fiber 4 and the sheath fiber 5 are mixed and the ratio of the core fiber 4 and the sheath fiber 5 changes stepwise depending on the radial direction of the hollow filter 11, The pressure from the outside can be cut off at 21 to effectively protect the core portion 11a from the external pressure, and it becomes easy to manufacture a filter of the same quality.

If there is too much plasticizer added to the core part 11a, the odor of the plasticizer becomes strong. Moreover, when there are too few plasticizers, it will become difficult to shape | mold firmly, the surface of a through-hole will become fuzzy easily, and it will become difficult to maintain the shape of a through-hole. If the total fineness is too small, a defect factor such as a hole is likely to occur when the core portion 11a is formed. Moreover, when there is too much total fineness, it will become difficult to insert in the 1st shaping | molding pipe | tube 17, and it will become difficult to add a plasticizer uniformly. The core portion 11a becomes hard when the plasticizer addition rate and the total fineness value are increased, and the core portion 11a is soft when the plasticizer addition rate and the total fineness value are decreased. And if the core part 11a is too soft, fluff will occur and it will become difficult to maintain the shape of a through-hole. Considering these matters, the core fiber 4 for forming the core portion 11a preferably has a total fineness of 23,000 denier to 70000 denier, more preferably 26000 denier to 60000 denier, and 30000 denier to 50000 denier. Most preferably. The plasticizer addition rate of the core fiber 4 is preferably 13% to 40%, more preferably 15% to 35%, and most preferably 17% to 30%. And it is preferable that the hardness of the core part 11a shall be 0 mm / 10 or more and less than 5 mm / 10 by such a total fineness and a plasticizer addition rate.

On the other hand, if the sheath fiber 11b has too much plasticizer, the smell of the plasticizer becomes strong. If the total fineness is too small, the circumference of the hollow filter 11 tends to be thinner than a desired value when the sheath fiber 11b is used. If the total fineness is too large, the circumference of the hollow filter 11 tends to be thicker than a desired value. The core portion 11a becomes hard when the plasticizer addition rate and the total fineness value are increased, and the core portion 11a is soft when the plasticizer addition rate and the total fineness value are decreased. And if the sheath fiber 11b is too soft, it becomes difficult to maintain the position of the core part at a desired position, and the cut surface is likely to fluff. On the other hand, if it is too hard, it will not be possible to absorb the external pressure when passing through a narrow conveyance path, and when the filter 22 is used, the surface will be too hard and the comfort will be worsened. Considering these matters, the core fiber 4 for forming the sheath fiber 11b preferably has a total fineness of 10,000 denier to 47,000 denier, more preferably 10,000 denier to 40000 denier, and 12000 denier to 30000 denier. Most preferably. The plasticizer addition rate of the sheath fiber 11b is preferably 0% to 15%, more preferably 3% to 12%, and most preferably 6% to 9%. And it is preferable that the hardness of the sheath fiber 11b shall be 5 mm / 10 or more and 10 mm / 10 or less by such a total fineness and a plasticizer addition rate.

The cross-sectional shapes of the through hole 10 and the core portion 11a are both circular and concentric with the axis of the hollow filter 11 as shown in FIG. As another example, as shown in FIG. 9, the center of the through hole 10 may not be on the axis of the hollow filter 11. Alternatively, the cross-sectional shape of the through hole 10 may be a star shape as shown in FIG. Although not shown, various shapes such as a cross shape and a heart shape may be used. Or as shown in FIG. 11, the cross-sectional shape of the core part 11a may be a rectangle. Further, although not shown, a polygon such as a triangle may be used. On the other hand, in the example of FIG. 3, the example in which the through hole 10 is provided as the hole provided in the core part 11 a has been described. However, the hole provided in the core part 11 a does not need to pass through, and from one end surface to the other What is necessary is just to extend toward an end surface. For example, as shown in FIG. 12, when the hollow filter 11 is cut along the cut line C, a hole 35 extending partway from one end surface of the hollow filter 11 toward the other end surface may be formed. Also in the hollow filter 11 provided with such a hole 35, the hole 35 can be prevented from being crushed or deformed. Such a hole 35 can be formed by introducing the core fiber 4 into the first forming tube while inserting and removing the mandrel 19 by the hole forming device 9.

The pressurization test was conducted using the hollow filter 11 shown in FIG. 3 as an example and a conventional filter having a through-hole having no core portion 11a and sheath portion 11b as a comparative example. The pressurization test was performed on a total of three samples 1 to 3 for the hollow filter 11 of the example, and a total of three samples 4 to 6 for the filter of the comparative example. In Samples 1 to 3 of the example, the single fineness of the core portion was 4.0 denier, the total fineness was 40000 denier, and the plasticizer addition rate was 17%. The single fineness of the sheath part was 8.0 denier, the total fineness was 15000 denier, and the plasticizer addition rate was 6%. In Comparative Samples 4 to 6, only fibers having a single fineness of 5.0, a total fineness of 47,000 denier, and a plasticizer addition rate of 19% are used. In addition, the cellulose acetate fiber was used for the core part of an Example, the sheath part of an Example, and a comparative example. The hardness of the core portion and the sheath portion of Sample 1 to Sample 3 and the hardness of Sample 4 to Sample 6 are as shown in FIG. Further, a winding paper having an air permeability of 10,000 CORESTA and a weight of 24.0 g / m 2 was wound around the sheath portion of Sample 1 to Sample 6.

Moreover, about hardness, the hardness defined by the following method is meant.
First, a 112 mm long cylindrical filter having the same diameter over the entire length is prepared as the measurement filter M.

Next, the measurement filter M is placed on a table 56 as shown in FIG. 13, and a pressing portion 53 having a diameter of 15 mm is brought into contact with the measurement filter M from above to apply a weight of 300 g and pressurize for 10 seconds (FIG. 13). 13 arrow L direction).

The distance between the upper surface of the base 56 and the pressing surface of the pressing portion 53 when the pressing portion 53 is brought into contact with the measuring filter without applying a weight of 300 g is defined as h1 (mm). The hardness (mm / 10) is defined by the following equation, where h2 (mm) is the distance between the upper surface of the table 56 and the pressing surface of the pressing portion 53 when the pressure is applied for 10 seconds.
Hardness (mm / 10) = (h1-h2) × 10

In the measurement of the hardness of a hollow filter having a sheath part and a core part, the hardness of the sheath part is measured using a measurement filter M (winding paper, core part and sheath and filter having a core part, a sheath part and a winding paper). The boundary line between the core portions is not shown), and the hardness of the core portion is measured with a filter for the core portion as the measurement filter M.

As shown in FIG. 14, the test method is a hollow filter 11 of sample 1 to sample 3 having a diameter of about 7.6 mm, a core diameter of about 5.0 mm, and a length of about 84 mm (the web 30 is omitted in the figure). The hollow filter 11 was pressurized until the distance between the two metal plates 52 became 6.0 mm. The shape of the through hole before, during and after pressurization (immediately after pressurization) was photographed and the distortion factor of the pore diameter was measured. Specifically, of the horizontal and vertical diameters in the cross-section of the through-hole, the longer major axis is A, and the shorter minor axis is B, and the distortion rate (A / B) is calculated. These average values were also calculated for each sample. When the distortion rate is smaller, the shape of the through hole is held against the external pressure. Note that the pressure test was performed in the same manner on Samples 4 to 6 as filters of the comparative example.

As a result, as shown in FIG. 15, the average values of the samples of the example and the comparative example were the same at a distortion rate of 1.02 before pressurization. As for the distortion during pressurization, the average value of the example was 1.22, the average value of the comparative example was 2.07, and the through hole shape was maintained in the example. As for the distortion immediately after pressurization, the average value of the example was 1.03, the average value of the comparative example was 1.29, and the through hole shape was maintained in the example. FIG. 16 is a graph showing this, and it can be seen that the strain rate is lower in the example both during and after pressurization.

1: filter cigarette manufacturing machine, 2: first feeding path, 3: second feeding path, 4: core fiber, 5: sheath fiber, 6: guide roller, 7: first opening and plasticizer addition device 8: second fiber opening and plasticizer addition device, 9: hole forming device, 10: through-hole, 11: hollow filter, 11a: core portion, 11b: sheath portion, 12: transport path, 13: paper winding device, 14: Filter mounting device, 15: Tip paper, 16: Cigarette, 17: Molding tube, 18: Trumpet guide, 19: Mandrel, 20: Support base, 21: Boundary line, 22: Filter, 23: Second transport drum , 24: guide member, 25: intermediate product, 26: rolling passage, 27: filter cigarette, 28: tow veil, 29: convex portion, 30: winding paper, 31: suction filter, 32: molding paper, 33: chopped tobacco 34: wrapping paper, 35: hole, 36: guide, 37: filter plug, 38: first transport drum, 39: transport path, 40: supply drum, 41: acceleration drum, 42: adhesive roller, 43: adhesion Chemical solution, 44: Transmission roller, 45: Drum with blade, 46: Pasting passage, 47: Delivery passage, 48: Narrow portion, 49: Double filter cigarette, 50: Heat treatment portion, 51: Hole, 52: Plate, 53: Pressing part, 54: Hollow filter intermediate body, 55: Gannicha belt, 56: Stand

Claims

A core fiber processing step in which a plasticizer is added to a core fiber having a total fineness of 23,000 denier to 70000 denier to obtain an addition rate of 13% to 40%;
A sheath fiber processing step in which a plasticizer is added to a sheath fiber having a total fineness of 10,000 denier to 47,000 denier so that the addition rate is 15% or less, or the addition rate is 0% without adding a plasticizer;
After the core fiber processing step and the sheath fiber processing step, the core fiber is cured to form a core portion formed with a hole extending from one end surface toward the other end surface, and the outside of the core portion is defined as the core portion. A hollow filter forming step of forming a hollow filter as a sheath part by covering with a sheath fiber,
A filter cigarette manufacturing method including a post-process, wherein after the hollow filter forming step, the hollow filter is transported through a narrow portion that is narrower than the diameter of the hollow filter and larger than the diameter of the core portion.
The filter cigarette according to claim 1, wherein an addition rate of the plasticizer to the core fiber is 13% to 35%, and an addition rate of the plasticizer to the sheath fiber is 3% to 12%. Production method.
The post-process is a convex projecting toward the inside of the rolling passage in order to give an opportunity to roll the hollow filter and the cigarette when introduced into the rolling passage where the hollow filter and cigarette roll. 2. The filter mounting step of passing a narrow portion formed with a portion, winding a tip paper around the hollow filter and the cigarette in the rolling passage, and connecting the hollow filter and the cigarette. Filter cigarette manufacturing method.
A cylindrical hollow filter in which a hole extending from one end surface toward the other end surface is formed;
An adsorption filter continuously connected in the longitudinal direction to the hollow filter,
The hollow filter has a core portion in which a hole extending from one end surface toward the other end surface is formed and a sheath portion covering the outside of the core portion,
A boundary line exists between the core portion and the sheath portion,
The core portion has a total fineness of 23000 denier to 70000 denier and a plasticizer addition rate of 13% to 40%.
The sheath portion has a total fineness of 10,000 denier to 47000 and a plasticizer addition rate of 0% to 15%.
A cylindrical hollow filter in which a hole extending from one end surface toward the other end surface is formed;
An adsorption filter continuously connected in the longitudinal direction to the hollow filter,
The hollow filter has a core portion in which a hole extending from one end surface toward the other end surface is formed and a sheath portion covering the outside of the core portion,
A boundary line exists between the core portion and the sheath portion,
The core portion has a hardness of 0 mm / 10 or more and less than 5 mm / 10,
The said sheath part has the hardness of 5 mm / 10 or more and 10 mm / 10 or less, The filter characterized by the above-mentioned.
The core portion has a total fineness of 23000 denier to 70000 denier and a plasticizer addition rate of 13% to 40%.
The filter according to claim 5, wherein the sheath portion has a total fineness of 10,000 denier to 47,000 denier and a plasticizer addition rate of 0% to 15%.
A filter according to claim 5;
A cigarette wrapped with wrapping cigarettes,
A filter cigarette comprising the filter and chip paper that wraps around the cigarette and connects in the longitudinal direction.