JP2926113B2 - Tobacco with dual structure filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tobacco with a dual structure filter using a double concentric composite filter material. Has,
And by having a fiber material molded into a corrugated sheet in the core, the removal efficiency of harmful components contained in tobacco smoke is high, and the smoker does not require excessive suction power,
Also, the present invention relates to a tobacco with a double concentric dual structure filter having a very good flavor when smoking.

[0002]

2. Description of the Related Art Hitherto, in order to solve the problem of health impairment due to smoking of cigarettes, the efficiency of removing harmful components contained in tobacco smoke has been high, and the suction resistance when smoking has not been large. The development of a filter for obtaining good-tasting tobacco is being promoted. Filters that have improved the removal efficiency of harmful components contained in tobacco smoke include those with an increased amount of filter material to be filled into the filter, or those with a longer filter,
Alternatively, there has been proposed a filter material having a finer size or a filter material having a modified cross section.These filters are intended to increase the contact area between the smoke particle component and the filter material during smoking. However, the tobacco filter produced by these methods has a drawback that the suction resistance during smoking increases and the feeling of smoking is impaired.

[0003] Such a tobacco filter that does not impair the feeling of smoking is used to dilute the tobacco smoke stream with ventilation air outside the filter to reduce the amount of particulate matter sucked into the mouth of the smoker. A filter having a so-called ventilation effect has been developed.

[0004] However, reducing the harmful components contained in tobacco smoke in any of the tobacco filters leads to impairing the flavor and taste during smoking, which is a fatal defect of these filters. As a tobacco filter having few such difficulties, for example, Japanese Patent Publication No. 63-6099
No. 1 discloses a tobacco that is obtained by adding cellulose-based ground pulp to a uniformly opened tow-shaped fiber bundle, forming a corrugated sheet into a corrugated sheet with a corrugating thermoforming device, and consolidating the corrugated sheet. A filter is shown, and Japanese Patent Publication No. 58-6467 discloses two or more fiber materials.
Shown are cigarette filters, one feeding the outer tube of a double conical tube and the other feeding a central circular tubular section to focus on a sea core structure.

[0005] The filter disclosed in Japanese Patent Publication No. 63-60991 has a large amount of a filter material packed in a corrugated sheet material, but the amount of the particulate component in the smoke stream of the filter is large. On the other hand, it is difficult to increase the filtration efficiency. On the other hand, in the filter disclosed in Japanese Patent Publication No. 58-6467, a filter capable of maintaining a balance between the filtration efficiency of the particulate components in the smoke stream and the flavor during smoking is required. Is not yet enough.

[0006]

In view of such circumstances, the present inventors have conducted intensive studies and as a result, have found that a filter material made of long fiber tow and a filter material having a sea core structure have a core portion. The present inventors have found that the above problems can be solved by forming a dual structure in which a filter material using a corrugated sheet is joined, and the present invention has been completed. An object of the present invention is to provide a tobacco with a filter that imparts flavor, has low airflow resistance, and has high filtration efficiency.

[0007]

SUMMARY OF THE INVENTION The gist of the present invention is to provide a filter element (A) in which a fiber material mainly composed of a long fiber crimped tow is wound around a plug, and a long fiber crimped tow. A filter provided with a sheath portion obtained by shaping a fiber material into a cylindrical shape and a core portion formed of a bundle of sheet-like materials obtained by corrugating a fiber material mainly composed of a long fiber crimped tow or a pulp fiber material inside the sheath portion. A dual structure filter in which the element (B) is joined, wherein the corrugated sheet forming the core of the filter element (B) has a groove having a pitch between grooves of 0.5 to 3 mm and a groove depth of 0.2 to 2 mm. The cigarette with a dual structure filter is characterized in that the filter having the dual structure has a filter element (A) on the mouth side and a filter element (B) on the tobacco leaf side.

FIG. 1 is a longitudinal sectional view of an example of a dual structure filter according to the present invention, and FIG. 2 is a transverse sectional view of the filter element (B). The filter element (A) has substantially the same structure as a plain filter conventionally used as a tobacco filter.
In FIG. 1, A is a filter element (A), B is a filter element (B), 1 is a core portion made of a bundle of corrugated sheets of the filter element (B), and 2 is a long fiber wound provided on the outer periphery of the core portion. A sheath portion made of a towed cylindrical body, 3,
Reference numeral 6 denotes a paper roll, 4 denotes an opening for providing a ventilation effect, and 5 denotes a filter element (A), which is made of a fibrous material mainly composed of a long fiber crimped tow which is a filtering material for smoke and is formed into a cylindrical shape. It is the filter part which did.

The dual structure filter according to the present invention comprises a filter element (A) and a filter element (B), and the filter element (A) is formed by winding a fiber material around a plug as shown in FIG. It is preferably a plain filter. As the fiber material constituting the filter element (A), a long fiber crimped tow made of rayon, vinylon, polyester fiber, polyolefin fiber, cellulose acetate fiber, or the like can be used. From the viewpoint of flavor and high filtration efficiency, It is preferable to use a long fiber crimped tow of cellulose acetate fiber.

The filter element (B) has a double concentric composite structure composed of a sheath portion formed of a fiber material in a cylindrical shape and a core portion formed of a corrugated sheet as a bundle.
The corrugated sheet constituting the core part of the filter element (B) is a sheet having a cross-sectional structure as shown in FIG. 3, the pitch P between the grooves is 0.5 to 3 mm, and the depth d of the grooves is
It is composed of a corrugated molded sheet having a groove of 0.2 to 2 mm.

The pitch P between the grooves of the corrugated sheet is 3
If it exceeds mm, when folding into a rod shape to form a core portion and converging, the shapeability to the rod shape deteriorates, and
The groove space of the corrugated sheet becomes large, the uniformity is reduced, the ventilation resistance is extremely low, the filtering effect of tobacco smoke is reduced, and if it is less than 0.5 mm, the rigidity of the corrugated sheet itself becomes too high. In addition, the shapeability into a rod shape is reduced. Corrugated sheet groove depth d is 2
If it exceeds 0.2 mm, the sheet is likely to be cut during corrugated sheet molding, and it is likely to be wrapped around a corrugated molding roll.If it is less than 0.2 mm, there is no corrugating effect, and the shaping property into a circular rod shape is not obtained. Getting worse.

When the pitch P between the grooves and the depth d of the grooves of the corrugated sheet are out of the above ranges, the corrugated sheet not only affects the shapeability into a circular rod shape, but also has a flavor in the smoke flow filtered by the corrugated sheet. The mixing ratio between the components and the particulate matter deviates from an appropriate value, and a tobacco filter with good flavor and particulate components can be appropriately removed cannot be obtained.

The filter element (B) of the dual structure filter according to the present invention has a cross-sectional structure as shown at B in FIG. As the fiber material of the sheath portion 2 constituting the filter element (B), the same fiber material as that of the filter element (A) can be used, and in consideration of the flavor and high filtration efficiency which are the objects of the present invention. For example, it is preferable to use a long fiber crimped tow of cellulose acetate fiber.

The corrugated sheet of the core constituting the filter element (B) includes polyolefin fibers, polyester fibers, polyamide fibers, cellulose acetate fibers,
After adding a plasticizer, if necessary, a sheet material such as a sheet made of a long fiber crimped tow made of pulp or the like, or a sheet made of a short fiber aggregate, or a non-woven fabric is added. A sheet that has been subjected to pressure molding by a corrugating thermoforming device and subjected to grooving can be used. In particular, in order to obtain a tobacco filter having a good flavor, it is preferable to use a corrugated sheet made of cellulose acetate fiber tow or crepe paper as the corrugated sheet.

In the present invention, taking into account the desired flavor and high filtration efficiency, the sheath 2 or both the sheath 2 and the core 1 of the filter element (B) are used as shown in FIGS. It is preferable that charcoal 58 is added. The charcoal is not particularly limited, and a commonly used particle size of 20 to 100 mesh and a bulk density of 450 to 60
It is preferred to add 0 g / l.

Addition of charcoal exhibits high adsorption performance to gaseous and vapor components of tobacco smoke such as acetaldehyde, isoprene, acetone, etc., which are not expected to have much adsorption effect with cellulose acetate fiber. In the present invention, by appropriately selecting the combination of the long fiber crimped tow in the sheath portion of the filter element (B) and the filling amount of the corrugated sheet bundle in the core portion, the adsorption effect can be further increased with a small amount of charcoal. be able to.

In the present invention, a ventilation opening may be provided on the surface of the filter element (B). By providing the ventilation opening, tobacco smoke flowing from the tobacco leaf side is provided. Changes due to the following factors. The first factor is that the smoke flowing into the sheath changes the flow to the core by the ventilation air, so that the smoke flowing from the sheath to the core and the smoke flowing directly through the core are combined. Then, smoke flows out to the suction side through the filter element (A).

The second factor is that if the suction amount on the suction side is constant, the flow rate of smoke flowing from the tobacco leaf side to the core becomes smaller as compared with the case where there is no ventilation opening, and The smoke stays longer. Therefore, the taste and the filtration efficiency can be easily adjusted by adjusting the ventilation resistance of the core portion and the charcoal amount of the sheath portion or both the sheath portion and the core portion. There are no particular restrictions on the opening position, the total opening area, and the number of holes, but the opening positions are equal in the circumferential direction and the total opening area is 1 to 1.
10 mm ² , more preferably ² to 5 mm ² , and the number of holes is 50 to
It is preferably 250.

The preferred method for producing the filter element (B) in the present invention is to uniformly open a fiber material mainly composed of long fiber crimped tow, and preferably to impregnate a plasticizer uniformly, It is supplied to the outer tube of a conical tube and bundled in a cylindrical shape. In this cylindrical material, a tow-like fiber bundle is uniformly opened as a core fiber material, and a fiber sheet is preferably provided with a plasticizer uniformly impregnated. The product or pulp fiber formed into a corrugated sheet with a grooved thermoforming roll is fed into a central conical tubular portion of a double conical tube while being supplied in a circular rod shape, and integrated into a sea core type. It is possible,
This manufacturing method will be described with reference to FIG.

First, the fiber material 42 for the sheath portion is uniformly spread by a spreader 45, and a plasticizer such as triacetin is preferably uniformly applied thereto by a delivery roll 46. 7 and the second ring guide 8, the cross section is gradually expanded into an arc shape, and while being formed into a cylindrical shape, is supplied to the outer tube of the double conical tube 15 and is converged into a cylindrical shape. By arranging the ring-shaped guides 7 and 8 so that the radius becomes gradually smaller, the uniformity of the thickness of the sheath layer of the filter and the shape of the cylindrical body can be made uniform, which is preferable.

On the other hand, when the fiber material for the core portion is a material that does not need to be spread, for example, when it is a nonwoven fabric or crepe paper, after passing through the guide 10 as shown in FIG. Then, it is formed into a corrugated sheet by a corrugating thermoforming device 13. Corrugated thermoforming equipment 13
Is composed of two upper and lower rolls having a large number of processing grooves, the upper and lower grooves mesh with each other and can be adjusted with a clearance of about 1 mm or less, and can be heated and molded at a predetermined pressure and temperature. I just need. The corrugated sheet may be pulled out by the extra roll 14, passed through the ring guides 7 and 8, and then supplied to the central circular tubular portion of the double conical tube 15.

When the fiber material for the core portion needs to be opened like a tow, it becomes like 41, and after being uniformly opened by the opening device 11, it is preferably plasticized by a delivery roll 12 such as triacetin. After the agent is uniformly applied, it is sent to a corrugating thermoforming device 13 and is formed into a corrugated sheet. The corrugated sheet is pulled out by the extra roll 14, passed through the ring guides 7 and 8, and then supplied to the central circular tubular portion of the double conical tube 15, where it is focused on the central portion of the fiber material of the cylindrical sheath portion. Be integrated.

At the same time, the wrapping paper 3 supplied to the filter plug machine is coated with an adhesive at least at one end thereof, is wound around the outer periphery of the sea core type filter material, and after joining the ends thereof, it is fixed with a cutter. The filter element (B) having the double concentric composite structure of the present invention can be obtained by cutting the filter element into a long length.

The dual structure filter of the present invention mainly comprises a fiber material mainly composed of a long fiber crimped tow of the filter element (A) and a long fiber crimped tow composed of a sheath portion and a core portion of the filter element (B). By changing the combination of the fiber materials described above, harmful components contained in tobacco smoke can be removed relatively easily and with high efficiency.

As shown in FIGS. 5 to 8, the tobacco with a dual structure filter of the present invention has a filter element (A) on the suction side and a filter element (B) on the tobacco leaf cylinder 57 side. The removal performance of harmful components contained therein and the flavor are improved.

The tobacco with a filter of the double concentric composite dual structure of the present invention has a great feature in that harmful components in tobacco smoke can be removed with higher efficiency as compared with a filter to which a filter has been conventionally developed. Things.

[0027]

The present invention will be described in more detail with reference to the following examples.

(Example 1, Comparative Example 1) A plain filter type filter element (A) having a length of 10 mm was prepared from a cellulose acetate fiber crimped tow shown in Table 1 by a conventional filter preparation method. On the other hand, the cross section of the cellulose acetate fiber crimped tow shown in Table 1 and the corrugated sheet formed of this crimped tow and serving as a core portion is shown in FIG. 3 as P = 1.0 mm and d = 0.5 mm.
A filter element (B) having a circumference of 24.7 mm and a length of 10 mm and having a sectional structure shown in FIG. 1 was prepared. The filter element (A) and the filter element (B) were combined to form a dual filter, and this filter was connected to one end of the cigarette with the filter element (B) on the tobacco leaf side as shown in FIG.

For comparison, the filter element (A) is combined with the filter element (A) to form a filter,
This filter was connected to one end of the cigarette as shown in FIG. The airflow resistance, ventilation, tar and nicotine removal rates of the two types of tobacco filters prepared as described above were measured, and the results are shown in Table 1.

Further, for comparison, in the filter configuration of Example 1, when a corrugated sheet having a pitch P between grooves of 4 mm was used in the core portion, the tobacco with the filter had a ventilation resistance of 78 mmH ₂ O and a nicotine removal rate of 32.1. % And a tar removal rate of 39.5%.

(Example 2, Comparative Example 2) A filter element (A) and a filter element (B) prepared by crimping the cellulose acetate fiber shown in Table 1 in the same manner as in Example 1 were combined. An aperture was provided on the surface of the filter element (B) to form a dual filter, and this filter was connected to one end of a cigarette with the filter element (B) on the tobacco leaf side as shown in FIG.

For comparison, the filter element (A) and the filter element (A) were combined to form a filter,
With this filter having the filter element (A) provided with an opening in the surface thereof on the tobacco leaf side, one end of the cigarette is placed in FIG.
Were connected as shown. With respect to the two types of tobacco with filters prepared as described above, the ventilation resistance, ventilation, and the filtration rates of tar and nicotine were measured, and the results are shown in Table 1.

[0033]

[Table 1]

[0034]

Industrial Applicability The tobacco with a filter having a dual structure according to the present invention has high performance of removing harmful components in tobacco smoke and can maintain good flavor in spite of low airflow resistance. .

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a filter according to the present invention.

FIG. 2 is a cross-sectional view of a filter element (B) of the filter according to the present invention.

FIG. 3 is a sectional view of a corrugated sheet constituting a filter element (B) of the filter according to the present invention.

FIG. 4 is a process chart showing an example of a process for producing a filter element (B) in the present invention.

FIG. 5 is a longitudinal sectional view of an example of a cigarette with a dual structure filter according to the present invention.

FIG. 6 is a longitudinal sectional view of another example of a cigarette with a dual structure filter of the present invention.

FIG. 7 is a longitudinal sectional view of another example of a cigarette with a dual structure filter according to the present invention.

FIG. 8 is a longitudinal sectional view of another example of a cigarette with a dual structure filter of the present invention.

FIG. 9 is a longitudinal sectional view of a comparative example of a cigarette with a filter.

FIG. 10 is a longitudinal sectional view of another example of a comparative cigarette with a filter.

[Explanation of symbols]

 Reference Signs List A Filter element (A) B Filter element (B) 1 Core part 2 Sheath part 3 Roll paper 4 Ventilation opening 5 Filter part of filter element (A) 57 Tobacco leaf cylinder part 58 Charcoal 6 Roll paper 7 Ring guide 8 Ring Guide 41 Long fiber tow-like fiber bundle 42 Long fiber tow-like fiber bundle 9 Crepe paper 10 Gait 11 Spreader 45 Spreader 12 Delivery berry roll 14 Delivery berry roll 46 Delivery berry roll 13 Corrugate roll 15 Double cone tube

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Kitayama 3 Kaigan-dori, Toyama City, Toyama Prefecture Mitsubishi Rayon Co., Ltd. Toyama Office (72) Inventor Eiichi Takase 3 Kaigan-dori, Toyama City, Toyama Prefecture Mitsubishi Rayon Co., Ltd. Toyama Works (56) References JP-A-54-46900 (JP, A) JP-A-55-141185 (JP, A) JP-B-54-29600 (JP, B1)

Claims (7)

(57) [Claims] 1. A filter element (A) in which a fiber material mainly composed of a long fiber crimped tow is wound around a plug, a sheath portion formed by shaping a fiber material mainly composed of a long fiber crimped tow into a cylindrical shape, and a sheath. A filter having a dual structure in which a filter element (B) provided with a core portion made of a bundle of sheet-like materials obtained by corrugating a fibrous material mainly composed of a long fiber crimped tow or a pulp fiber material inside the portion is provided. The corrugated sheet constituting the core of the filter element (B) has a dual structure filter having a groove pitch of 0.5 to 3 mm and a groove depth of 0.2 to 2 mm. ), A tobacco with a dual structure filter, wherein the tobacco leaf side is arranged as a filter element (B). 2. The cigarette according to claim 1, wherein the long fiber crimped tow is a cellulose acetate fiber tow. 3. The cigarette with a dual structure filter according to claim 1, wherein the corrugated sheet constituting the core of the filter element (B) is a corrugated molded sheet made of crepe paper. 4. The cigarette according to claim 1, wherein the corrugated sheet constituting the core of the filter element (B) is a corrugated molded sheet made of cellulose acetate fiber tow. 5. The filter element (B), wherein charcoal is added to a sheath portion of the filter element (B).
Or the tobacco with the dual structure filter according to claim 4. 6. The cigarette with a dual structure filter according to claim 1, wherein charcoal is added to a sheath portion and a core portion of the filter element (B). 7. The filter element (B) according to claim 1, wherein an opening for ventilation is provided on the surface of the filter element (B). Cigarette with dual structure filter.