WO2001030184A1

WO2001030184A1 - Cigarette filter

Info

Publication number: WO2001030184A1
Application number: PCT/JP2000/007214
Authority: WO
Inventors: Kazuo Maeda; Hideo Kaneko; Yoshinori Iwashima; Motoya Mouri; Hisashi Kanda; Tsuruyoshi Matsumoto
Original assignee: Mitsubishi Rayon Co., Ltd.; Japan Filter Technology, Ltd.; Takeda Chemical Industries, Ltd.
Priority date: 1999-10-22
Filing date: 2000-10-18
Publication date: 2001-05-03
Also published as: JP2001120250A

Abstract

A cigarette filter for smoking, capable of efficiently removing gas/vapor phase components in cigarette smoke, and comprising an activated charcoal and a molded activated charcoal (10) having a molding binder, wherein grooves (12) extending along the longitudinal direction of the filter are formed in the outer peripheral surface of the molded activated charcoal. This cigarette filter is preferable for triple-structure filters used in low-tar products.

Description

Specification

Tobacco Phil Yuichi

Technical field

The present invention relates to a tobacco filter for smoking, and more particularly, to a tobacco filter for low tar tobacco having an excellent effect of reducing gas and vapor phase components.

This application is based on a patent application to Japan (Japanese Patent Application No. 11-131756), the content of which is incorporated herein by reference.

Background art

With the recent trend toward health, tobacco smokers have shifted their taste from high tar products to middle and evening products, from middle and evening products to low evening products, and to ultra low tar products. I have.

As the tobacco filter in such tobacco products, a crimped fiber bundle of cellulose acetate or a fibrous filter made of paper is frequently used. In addition, in order to efficiently remove gas and vapor phase components in tobacco smoke, a charcoal filter is used, in which granular activated carbon is dispersed and supported on a fibrous filter.

In a charcoal filter, activated carbon is added from above to crimped fibers or paper that has been spread into a sheet at the time of manufacture of the filter, and then collected from a sheet to a rod. For this reason, granular activated carbon adheres to one side of a sheet-shaped crimped fiber bundle or paper, and the presence of activated carbon tends to be biased during the filling process. There was a lot of smoke.

In addition, if the amount of activated carbon added is increased in order to improve the performance of removing gas and vapor phase components of tobacco smoke, the ventilation resistance of the filter increases in accordance with the added amount. The amount added was limited and the ability to remove large amounts of gas and vapor phase components was also limited.

Therefore, it is difficult to efficiently remove the gas / vapor phase components in tobacco smoke using conventional techniques.

In order to solve such a problem, for example, Japanese Utility Model Registration Publication (Y 2) No. 2 532 045 includes a molded activated carbon formed by an extrusion molding method. A cigarette filter is shown. This cigarette filter is formed by extrusion molding, has at least 10 communicating holes in the longitudinal direction, is a rod having a length of 3 to 20 mm and a diameter of 5 to 10 mm, and has a circular cross section. A cigarette filter comprising a molded activated carbon.

However, S, et al., Introduced ventilation air from the outside of Fil Yuichi, and applied the Fill Yuichi equipped with this activated carbon to low tar tobacco or ultra-low tar tobacco that diluted tobacco smoke. In this case, the cross-sectional shape of the activated carbon is circular, and the outermost layer of the activated carbon has walls of the activated carbon. The introduction of air was difficult.

On the other hand, when the outer diameter of the molded activated carbon is smaller than the inner diameter of the tip paper, ventilation air is introduced due to the gap between the activated carbon and the tip paper, but the position of the activated carbon becomes unstable and is introduced again. The ratio of ventilation air also fluctuates, and becomes unstable. Disclosure of the invention

The present invention has been made to solve the above problems, and an object of the present invention is to provide a low tar tobacco filter for efficiently removing gaseous vapor components in tobacco smoke.

The present invention is directed to a low-tar cigarette in which ventilation air is introduced from the outer periphery of a filter to dilute tobacco smoke by providing a groove in the outer peripheral surface of the molded activated carbon. While being introduced stably from the ditch to the fill, the tobacco smoke was found to pass through the formed activated carbon communication holes and to efficiently remove the gas-vapor phase component in the tobacco smoke. Was.

The present inventors provide a tobacco filter comprising a molded activated carbon comprising at least activated carbon and a molding binder, characterized in that the molded activated carbon has a groove extending in the longitudinal direction of the filter on the outer peripheral surface thereof. The present inventor has found that a tobacco filter capable of efficiently removing gas-vapor phase components in tobacco smoke as a low tar tobacco filter into which ventilation has been introduced.

SUMMARY OF THE INVENTION The present invention relates to a compacted activated carbon having a fibrous filter disposed on both sides in the longitudinal direction. A ripple structure filter, which is suitable as a tobacco filter having a ventilation hole formed on the outer periphery of the molded activated carbon, for chip paper covering the tobacco filter.

Here, it is desirable that the width of the groove formed on the outer peripheral surface of the molded activated carbon is smaller than the interval between the grooves. Also, the width of the groove is desirably 0.0 lmm to 6mm.

The shaped activated carbon desirably has a weight of 50 to 100 Omg, and desirably contains 10 to 95% by weight of activated carbon.

Further, it is desirable that the formed activated carbon has a communication hole having a length of 6 or more and 60 or less along the longitudinal direction and a cross-sectional shape of a triangle, a quadrangle, a hexagon, or a round. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a perspective view of a molded activated carbon.

FIG. 2 is a perspective view showing an example of a cigarette filter.

FIG. 3 is a cross-sectional view showing an example of the formed activated carbon.

FIG. 4 is a cross-sectional view showing an example of the formed activated carbon. BEST MODE FOR CARRYING OUT THE INVENTION

The present invention relates to a cigarette filter comprising a molded activated carbon having activated carbon and a molding binder, and as shown in FIG. 1, on the outer peripheral surface of a substantially columnar shaped activated carbon 10 in the longitudinal direction of the filter. The tobacco fill is characterized by having a circumferential groove 12 extending along the groove.

As shown in FIG. 2, for example, as shown in FIG. A triple structure filter provided with a fibrous filter 18 provided in the filter paper, wherein the tip paper covering the tobacco filter was provided with a ventilating hole 22 on the outer periphery of the molded activated carbon 10. It is also suitable for things.

As activated carbon, activated carbon for tobacco filters used in charcoal filters can be used. Also, to form activated carbon, filter It is possible to use activated carbon with a smaller particle size, which cannot be used with ordinary charcoal filters, without fear of falling off. Desirable particle size of the activated carbon is 1 / m or more and 50 im or less, preferably 3 to 20 xm in average particle diameter.

When the activated carbon is molded in the present invention, a molding binder is added to improve the moldability and the strength of the molded product. As the molding binder, an organic binder and Z or an inorganic binder are used. These may be used alone or in combination of two or more.

It is desirable that the total amount of the molding binder added is such that the activated carbon content in the molded activated carbon is 10% by weight or more and 95% by weight or less in order to exhibit the original adsorption performance of the activated carbon. . When an organic binder and an inorganic binder are used in combination, it is preferable to use the organic binder and the inorganic binder in a weight ratio of 1: 100 to 100: 1.

Examples of the inorganic binder include, but are not particularly limited to, natural clays such as Kibushi clay and Kagome clay, clay minerals such as kaolin, bentonite and sepiolite, and inorganic materials such as alumina, hydroxide hydroxide, silica, and titania. Oxides and inorganic hydrated oxides are exemplified. Natural clay has good moldability and can reduce the amount of organic binder to be added. The addition of a porous inorganic binder also has the effect of adsorbing and removing harmful components in tobacco smoke together with activated carbon. The amount of the inorganic binder used is 5% by weight or more and 90% by weight or less, more preferably 5% to 80% by weight. As the organic binder, a known organic binder generally used for molding a ceramic can be used. Examples thereof include polysaccharides such as dextran and pullulan, cellulosic compounds such as methylcellulose and hydroxymethylcellulose, and polyhydroxy compounds such as glycerin and ethylene glycol. When an organic binder is used as the molding binder, the total amount of the organic binder added is 0.1% by weight or more and 20% by weight in the molded activated carbon in order to reduce the adsorption performance of the molded activated carbon. Hereinafter, it is more preferably 0.05 to 10% by weight.

In the present invention, the method for producing the shaped activated carbon is not particularly limited. A necessary amount of a solvent such as water or alcohol is added to the raw material for forming activated carbon, mixed, formed into a target shape by an extrusion method, etc., dried, and heat-treated if necessary. In the present invention, chip paper can be used for connection between the filter and the tobacco leaf. For low tar tobacco, ventilating air, which dilutes tobacco smoke, is introduced into the filter by making holes in the chip paper.

When the filter of the present invention is used as a low-filtration filter for cigarettes, the ventilation rate is preferably 20 to 80%, and more preferably 50 to 80%. At this time, it is desirable that the air permeability of the paper roll of the filter is 100 to 300 CUTS and the air permeability of the chip paper is 500 to 300 CU. In the present invention, when a ventilation hole is provided, the position of the ventilation hole in the longitudinal direction of the fill is preferably the outer peripheral portion of the molded activated carbon. If the ventilation hole is located on the tobacco leaf side of the molded activated carbon, the rate of ventilation introduced is reduced, and the mainstream smoke mixed and diluted with the ventilation air is used as the communication hole for the molded activated carbon. And the activated carbon cannot be effectively adsorbed. Further, if the ventilation hole is located on the suction side of the activated carbon, the ventilation hole may enter the smoker's mouth during smoking and may be undesirably covered.

As the fibrous filler disposed on both sides in the longitudinal direction of the formed activated carbon, a crimped fiber bundle of cellulose acetate or a filler composed of paper is used.

The weight of the shaped activated carbon is desirably from 5 Omg to 100 Omg, and more preferably from 100 to 100 mg. If the weight of the molded activated carbon is less than 50 mg, it is not preferable because the adsorption removal performance for tobacco smoke is reduced. On the other hand, if it exceeds 100 Omg, even the perfume components in tobacco smoke are adsorbed and the satisfaction of smoking is reduced, which is not preferable.

Conventionally, a charcoal filter with granular activated carbon dispersed and supported on a fibrous filter has used 30 to 5 mg of granular activated carbon. There is a problem that the ventilation resistance of the filter increases. However, in the shaped activated carbon of the present invention, by forming the communication holes, the tobacco smoke mainly passes through the communication holes, so that the weight of the activated carbon can be increased without increasing the ventilation resistance. is there. The shaped activated carbon preferably contains 10% to 95% by weight of activated carbon, more preferably 20% to 95% by weight, and most preferably 30% to 90% by weight. If the content of activated carbon is less than 10% by weight, the pore surface area of the molded activated carbon is reduced, and the adsorption performance is impaired. On the other hand, if the content exceeds 95% by weight, the moldability of molding activated carbon is impaired.

The acetone adsorption performance of the molded activated carbon is preferably from 3% to 30%, more preferably from 6 to 30%, and most preferably from 9 to 28%. In addition, as the pore surface area, it is preferably not more than 100m / g more than 200 Orr ^ Zg, good Ri preferably 200~2000m ² Zg, and most preferably 300 to: a 1900m ^ / g.

The present invention is characterized in that, as shown in FIG. 1, for example, a peripheral groove 12 is formed on the outer peripheral surface of a molded activated carbon 10 along its longitudinal direction.

As the circumferential groove 12, as shown in FIG. 3, it is preferable that the width Wa of the circumferential groove 12 is smaller than the interval Wb of the circumferential surface 潢 12. If the width of the peripheral groove is equal to or greater than the interval (as shown in Fig. 4), when handling multiple molded activated carbons in the filter manufacturing process, It is not preferable because the circumferential grooves mesh with each other and a bridging phenomenon occurs, and smooth handling of the formed activated carbon is deteriorated.

The shape of the peripheral groove 12 is not particularly limited. The cross-sectional shape of the peripheral groove 12 may be a semicircle, a U-shape, or a polygon such as a triangle, a quadrangle, or a pentagon.

The width of the peripheral groove 12 is preferably 0.01 mm or more and 6 mm or less, and more preferably 0.1 to 2 mm. If the width of the peripheral groove 12 is smaller than 0.01 mm, the ratio of the introduced ventilation decreases. If it exceeds 6 mm, the tip vapor is undesirably deformed.

The depth of the peripheral groove is preferably 0.01 mm or more and 4 mm or less, more preferably 0.1 to 2 mm. If the depth of the peripheral groove is smaller than 0.01 mm, the ratio of the introduced ventilation decreases. If it exceeds 4 mm, the strength of the molded activated carbon decreases, which is not preferable. Further, the size of the peripheral groove may change in the longitudinal direction of the molded activated carbon. The number of peripheral grooves is not particularly limited, but is preferably 2 or more and 200 or less. More preferably, the number is 4 to 50, and most preferably, the number is 10 to 40.

As shown in FIGS. 1 and 3, it is desirable that the formed activated carbon has a communication hole 14 penetrating the same in the longitudinal direction.

The number of the communication holes 14 is preferably 6 or more and 60 or less, more preferably 10 to 50. If the number of communication holes is less than 6, the area for adsorbing the gas / vapor phase component when tobacco smoke passes through the communication holes is not preferable. If it is more than 60, the shape of the communicating hole is likely to collapse during molding, and the thickness of the wall of the activated carbon partitioning the communicating hole is reduced, which is not preferable because the strength of the activated carbon is reduced. The cross-sectional shape of the communication hole is preferably a circular shape such as a circle or an ellipse, or a polygon such as a triangle, a tetragon, or a hexagon.

The number of cells of the communication hole 20 cells / inch ² or more, preferably 1 000 cell / inch ² hereinafter, and more preferably 1 00-1 000 cell ^Z inch ώ. The fill evening one airflow resistance of the present invention, it is preferable that a 50~ 1 70mmH "O. If it is 50 mm H ₂ 〇 below, the suction resistance pile is low when the smoke as tobacco, smoking satisfaction If it exceeds 170 mmH ₂ mm, on the other hand, the suction resistance will be high, and it will be difficult to inhale tobacco smoke.

Example

Hereinafter, the present invention will be described in more detail with reference to Examples.

In addition, each measurement item in the Example was based on the following method.

Acetone adsorption performance>

The measurement was performed in accordance with the solvent vapor adsorption performance specified in the activated carbon test method (JISK 1474). That is, air containing lZn solvent vapor was passed through the sample at a rate of 2 LZmin, and the equilibrium adsorption performance was determined from the increase in the sample when the mass became constant. Here, 1 Zn is a dilution ratio, and n is a dilution multiple of the solvent saturation concentration. Measurements using acetone in Solvent, temperature of the adsorption vessel 2 5. 0 ° C, was measured at vapor concentration of dilution _{n = l 7. 5 (3 7.} 5 g / m 3).

<Pore surface area> The amount of nitrogen adsorbed at the liquid nitrogen boiling point (at 196 ° C) was measured, and the pore surface area was determined by the BET method.

The pore volume was determined by measuring the amount of nitrogen adsorbed at a relative pressure of 0.931 of nitrogen gas corresponding to a pore diameter of 30 nm at the liquid nitrogen boiling point temperature (1 196 ° C).

Average pore diameter>

From the pore surface area and the pore volume, the average pore diameter was calculated by the following formula.

Average pore diameter (A) = 4 X pore volume (ml / g) Z pore surface area (m ² / g) X 10 ⁴

The airflow resistance of the filter was measured based on the Choles-Yu method using Kato Kogyo's “〇TC-type suction resistance meter”.

Ventilation

Filtration at Phil Yuichi was measured using a Filtrona ventilation tester based on the Choles Evening Method.

According to the method described in Choles Evening Method, a smoking test was carried out using “Rotary Smoker RM 20ZCS” manufactured by Borgwald, and the smoke component captured at Cambridge Phil Yuichi was quantified by gas chromatography.

Gas / vapor phase component measurement>

A smoking test was performed based on the Choles Evening Method using a “Rotating Smoker RM2 OZC S” manufactured by Boulder Walt Co., Ltd. The gas and vapor phase components were collected in a collection bag and measured by a gas chromatograph.

Using a rotary smoker RM20ZCS manufactured by Boulder Walt Co., Ltd., smoked tobacco smoke is passed through a benzene solution of N-tert-butyl-α-phenylnitrone, and a JEOL electron spin resonance spectrometer “JES-ΤΕ200” , The electron spin concentration in this benzene solution was measured. As a sample of known concentration, a solution of 4-hydroxy-2,2,6,6-tetramethylpiperidine-11-year-old xyl in benzene was used. [Example 1]

As a crimped acetate tow, using a tow with a single yarn fineness of 1.7 dtex, single yarn cross-sectional shape Y shape, and a total fineness of 49,000 dtex, using a plug winding machine (“KDF-III / AF-III” manufactured by HONEY), 600m / A filter plug having a circumference of 24.2 mm and a length of 120 mm was manufactured at a winding speed of 1 minute. This fill plug was cut to a length of 7.5 mm to create a plain fill plug.

Separately, an inorganic binder and an organic binder were added to powdered activated carbon manufactured by Takeda Pharmaceutical Co., Ltd., water was added and mixed, the mixture was extruded to a predetermined size by an extrusion molding method, and then dried to form a molded activated carbon. The molded activated carbon has a length of 10 mm and a diameter of 7.7 mm, and its outer peripheral surface is formed with 15 peripheral grooves having a width Wa of 0.6 mm and an interval Wb of 1.0 mm. Table 1 shows the specifications of the molded activated carbon (molded activated carbon (1)).

A triple-structured filter was created by sandwiching activated carbon (1) between the two plain filters described above. Table 2 shows the composition of the obtained tobacco file. Further, the tobacco filter and the tobacco leaf were connected as follows.

As the tobacco leaf, a filter was cut from a commercially available tobacco (trade name “Mar 1 boro” manufactured by Philip Morris Co., Ltd.), and the tobacco roll was taken out and used. To connect the tobacco filter Yuichi and the tobacco leaves, the filter was placed in contact with the tobacco leaves, and the outer periphery was wrapped with chip paper.

A smoking test was performed on the obtained tobacco. Table 3 shows the amount of tar and nicotine smoking. Regarding the gas and vapor phase smoking amount, four tobacco smokes from the first puff to the fourth puff are collected from among the number of smokings in the smoking test, and the gas and vapor phase components are measured. See Figure 4. Table 5 shows the measurement results of gas and vapor phase components measured for tobacco smoke after the fifth puff.

The measurement results are shown as the average amount of smoking obtained by dividing the amount of smoking of each component by the number of smokings, and the reduction rate of each component compared to the amount of smoking in the plain filter.

Table 6 shows the results of measuring the concentration of active species in tobacco smoke by the electron spin resonance method.

[Example 2] In the same manner as in Example 1, tobacco fill Yuichi was trial manufactured. However, as the filter paper, a highly air-permeable paper of 1000 CU was used, and the configuration of the cigarette filter Yuichi was as shown in Table 7.

The tobacco filter and the tobacco leaf were connected as follows.

The tobacco leaf was cut from a commercially available tobacco (trade name: Mar 1 boroj, manufactured by Philip Morris), and a cigarette roll was taken out from the tobacco filter and used. As a connection method, a part of the filter was arranged so as to be in contact with the tobacco leaf part, and the outer periphery thereof was wrapped with chip paper provided with a ventilation hole. The portion of the tip paper where the ventilation holes were provided was located 12.5 mm from the end face of the fill paper and 15 peripheral grooves on the outer peripheral surface. When the formed activated carbon (1) was used, the chip ventilation was 57%.

A smoking test of the obtained tobacco was performed. Table 7 shows the amount of evening and nicotine smoking. Regarding the gas and vapor phase smoking amount, the result of measuring the gas and vapor phase components by capturing four tobacco smokes from the first puff to the fourth puff out of the number of smokings in the smoking test is shown. See Figure 8. Table 9 shows the measurement results of the gaseous phase components of the tobacco smoke after the fifth puff.

[Comparative Example 1]

For the purpose of comparison with the embodiment, a dual-structure filter composed of a plain filter and a charcoal filter was trial manufactured.

The plain fill Yuichi is a crimped acetate tow using a single yarn fineness of 2.4 dtex, a single yarn cross-sectional shape of Y shape, and a total fineness of 4400 dtex tow with a circumference of 24.2. mm, filter plugs with a length of 120 mm were produced. The charcoal fill has a single yarn fineness of 3.3 decitex, a single yarn cross-sectional shape of Y shape, and a total fineness of 40000 decitex, to which granular activated carbon is dispersed and carried to produce a circumference of 24.2 mm, A filter plug of 120 mm length was manufactured. From the above filter plug, a dual structure filter consisting of a 15 mm long charcoal fill and a 10 mm long plain fill was obtained. The activated carbon content in the evening of the charcoal fill is 50 mg. Table 2 shows the composition of this filter. Tables 3 to 5 show the evaluation results of tobacco obtained by connecting the filter and the tobacco leaves in the same manner as in Example 1. Table 6 shows the results of measuring the concentration of active species in tobacco smoke by the electron spin resonance method.

[Comparative Example 2]

For the purpose of comparison with the examples, a normal plain filter was trial manufactured. Crimping acetate-As a tow, single fiber fineness 3.3 dtex, single yarn cross-sectional shape Y shape, total fineness 4900 Use a decitex tow, circumference 24.2 mm, length 1 2 0 mm fill plug — manufactured plug. This filter plug was cut into a length of 25 mm to obtain a plain filter.

This plain filter was connected to the tobacco unit in the same manner as in Example 1 and evaluated. Table 2 shows the composition of this filter and Tables 3 to 5 show the results of tobacco evaluation. Table 6 shows the results of measuring the concentration of active species in tobacco smoke by the electron spin resonance method.

[Comparative Example 3]

For the purpose of comparison with the embodiment, except that a round shaped activated carbon (2) having a length of 10 mm and a diameter of 7.7 mm, which does not have an outer peripheral surface, was used in the same manner as in Example 1, the filter was used. Created one. At this time, as the wrapping paper, 1000 CU high air permeability wrapping paper was used.

Table 1 shows the specifications of the molded activated carbon. Table 7 shows the filter configuration. If the activated carbon (2) with a circular cross section is used and ventilation holes are provided on the outer periphery, the chip ventilation becomes 23%, and the percentage of air introduced from the outer periphery of the filter Decreased compared to Example 2.

Tables 7 to 9 show the tobacco evaluation results obtained by connecting the tobacco fill Yuichi and the tobacco leaves in the same manner as in Example 2. Example 1 Comparative Example 3 Molded Activated Carbon Molded Activated Carbon (1) Molded Activated Carbon (2) Circular Circular Sectional Shape

1 With 5 circumferential grooves No groove Weight of activated carbon (mg) 270 270 Number of communication holes (pieces) 2 1 2 1 Content of activated carbon in molded activated carbon (%) 60 60 Inclusion of organic binder for molding Rate (%) 9 9

Acetone adsorption performance (%) 1 5.6 1 5.9 Pore surface area (m ² / g) 58 1 585 Pore volume (m 1 / g) 0.27 5 0.296 Average pore diameter (A) 1 8.9 20.3 Table 2

Table 3

Example 1 Comparative Example 1 Comparative Example 2 Tar Smoking Amount (mg) 1 2.7 12.8 13.2 Nicotine Smoking Amount (mg) 1.0 1.0 1.1 Table 4

Example 1 Comparative Example 1 Comparative Example 2 Activated Carbon Molded Activated Carbon (1) Ash Ash None a g / puff) 38 67 77 Acetaldehyde (%, plain

49 87 1 00 filter)

ill g / puff) 1 1.8 1 8.7 20.5 Butane (%, vs. plain)

58 9 1 1 00 filter)

(li g / puff) 1. 9 3. 1 3.5

1,3 butadiene (%, vs. plain

54 89 1 00 filter)

g / puff) 28 33 48 Isoprene (% vs. plain)

58 69 1 00 Phil Yuichi)

Example 1 Comparative Example 1 Comparative Example 2 Activated Carbon Molded Activated Carbon (1) 'fe / J Ash Ash None

(a g / puff) 46 1 03 1 08 Acetaldehyde (% vs. plain

43 95 1 00 filter)

(g / puff) 1 5. 1 26. 5 26. 9 Butane (%, vs. plain)

56 99 1 00 Phil Yuichi)

(li g / puff) 3.1.5.1.5.2

1,3 butadiene (%, vs. plain

60 98 1 00 Phil Yuichi)

(g / puff) 29 52 6 1 Isoprene (%, plain

48 85 1 00 Phil Yuichi) Table 6

Table 7

Table 8 Example 2 Comparative Example 3 Activated carbon Molded activated carbon (1) Molded activated carbon (2) Acetaldehyde ill g / puff) 15 29

Butane (11 g / puff) 5.4 9.7

ill g / puff) 0.9.1.6 Isoprene (β g / puff) 1 1 2 1 Table 9

Industrial applicability

INDUSTRIAL APPLICABILITY The tobacco filler Yuichi of the present invention can efficiently remove gas / vapor phase components in tobacco smoke. In particular, it is suitable for a triple structure filter that becomes a low tar product.

Further, by making the width of the groove formed on the outer peripheral surface of the molded activated carbon smaller than the interval between the grooves, the manufacturing process is facilitated.

Further, by setting the width of the groove to 0.0 lmm to 6 mm, the introduction ratio of ventilation can be increased without causing deformation of the chip paper.

By setting the weight of the molded activated carbon to 50 to 100 Omg, it is possible to improve the adsorption removal performance for tobacco smoke while maintaining the perfume component in the tobacco smoke moderately. In addition, when the activated carbon contains 10 to 95% by weight of activated carbon, both the adsorption performance and the moldability can be achieved.

Further, since the formed activated carbon has the communication holes, the tobacco smoke mainly passes through the communication holes, so that the weight of the activated carbon can be increased without increasing the ventilation resistance.

The present invention may be embodied in various other forms without departing from its spirit or essential characteristics. Therefore, the above-described embodiment is merely an example in every aspect and should not be construed as limiting. The scope of the present invention is defined by the appended claims, and is not restricted by the specification. Further, all modifications and changes belonging to the equivalent range of the scope of the patent request are within the scope of the present invention.

Claims

The scope of the claims

1. A tobacco filter provided with a molded activated carbon having activated carbon and a molding binder, wherein a groove is formed on an outer peripheral surface of the molded activated carbon along a longitudinal direction of the filter.

2. The tobacco filter is a triple-structured filter in which molded activated carbon and a fibrous filter are disposed on both sides in the longitudinal direction, and the tip paper covering the tobacco filter has an outer peripheral portion of the molded activated carbon. 2. The tobacco filter according to claim 1, wherein a ventilation hole is formed.

3. The tobacco filter according to claim 1, wherein the width of the groove formed on the outer peripheral surface of the molded activated carbon is smaller than the interval between the grooves.

4. The groove width is 0.0 l mn! The tobacco filter according to claim 1, wherein the size of the tobacco filter is about 6 mm.

5. The tobacco filter according to claim 1, wherein the weight of the formed activated carbon is 50 to 100 Omg.

6. The tobacco filter according to claim 1, wherein the molded activated carbon contains 10 to 95% by weight of activated carbon.

7. The tobacco filter according to any one of claims 1 to 6, wherein the formed activated carbon has a communication hole penetrating along a longitudinal direction thereof.

8. The molded activated carbon has at least 6 and not more than 60 communication holes, and the cross-sectional shape of the communication holes is triangular, tetragonal, hexagonal, or round. The cigarette filter described.