JP2920448B2 - Dual structure tobacco 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 dual structure tobacco filter using a double concentric composite filter material, and more particularly, to a filter having a dual structure having a seascore type structure. 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,
The present invention also relates to a tobacco filter having a double concentric dual structure, which does not require an excessive suction force for a smoker and has an extremely good flavor during smoking.

[0002]

2. Description of the Related Art Conventionally, in order to solve the problem of health impairment due to cigarette smoking, the efficiency of removing harmful components contained in cigarette smoke is high, and the suction resistance when smoking is not large. Development of a filter for obtaining tobacco with good flavor is being promoted. Filters that can increase the efficiency of removing harmful components contained in tobacco smoke include those with an increased amount of filter material to be filled into the filter, those with longer filters, and those with finer filter materials. There have been proposed filters designed to increase the efficiency of filtration by increasing the contact area between the smoke particle component and the filter material during smoking. However, tobacco filters made by these methods have a drawback that the suction resistance during smoking is increased and the feeling of smoking is impaired.

[0003] Such a tobacco filter that reduces the feeling of smoking relatively little by diluting the flow of tobacco smoke with ventilation air outside the filter to reduce the amount of particulate matter drawn into the mouth of the smoker. A filter having a so-called ventilation effect has also 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 which is obtained by adding ground pulp mainly composed of cellulose to a tow-shaped fiber bundle which is uniformly opened, and forming a corrugated sheet into a corrugated sheet by a corrugating thermoforming device. A filter is disclosed. Japanese Patent Publication No. 58-6467 discloses a sea core structure in which two or more kinds of fiber materials are supplied to one of the outer pipe of a double conical pipe and the other to a central circular tubular part. A cigarette filter for focusing on the cigarette is shown.

[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 filter that imparts flavor and 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 made of a bundle of sheets 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 tobacco filter characterized by being joined to the element (B).

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

The dual structure filter of the present invention comprises a filter element (A) and a filter element (B), and the filter element (A) is obtained 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. Further, as shown in FIG. 5C, charcoal 58 may be added to the filter element (A). As charcoal,
Although there is no particular limitation, it is preferable to add particles having a particle size of 20 to 100 mesh and a bulk density of 450 to 600 g / l.

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 portion of the filter element (B) is a sheet having a cross-sectional structure as shown in FIG. 3, wherein the groove depth d is 0.2 to 2 mm, and the groove pitch P is 0.5 to 2. It is composed of a corrugated molded sheet having a 3 mm groove. In a corrugated sheet in which the pitch P between the grooves of the corrugated sheet is out of the range of 0.5 to 3 mm and the depth d is out of the range of 0.2 to 2 mm, when the corrugated sheet is folded into a rod shape to constitute the core, this circle is formed. As the moldability into a rod-like material decreases, the mixing ratio of the flavor component and the particulate material in the smoke stream filtered by this corrugated sheet deviates from an appropriate value, and the particulate component is properly removed with a good flavor. It cannot be a tobacco filter.

The filter element (B) of the dual structure filter of the present invention has a vertical 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.

[0012] The corrugated sheet of the core part 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 material obtained by forming a long fiber crimped tow made of pulp or the like into an open sheet, or a sheet material made of a short fiber aggregate, or a nonwoven fabric form A sheet that has been subjected to pressure molding by a corrugating thermoforming device and subjected to grooving can be used.
In particular, to obtain a tobacco filter with good flavor, cellulose acetate fiber tow as corrugated sheet,
It is preferred to use a corrugated molded sheet made of crepe paper.

In the present invention, considering the desired flavor and high filtration efficiency, FIGS. 5 (d), (e) and (f)
As shown in (1), charcoal 58 may be added to the sheath portion 2, the core portion 1, or both of the filter element (B).

[0014] A preferred method for producing the filter element (B) of the present invention is to uniformly open a fiber material mainly composed of a long fiber crimped tow, and preferably to uniformly impregnate a plasticizer.
A fiber which is supplied to the outer tube of a double conical tube and bundled in a cylindrical shape, and in which a tow-like fiber bundle is uniformly opened as a core fiber material in the cylindrical material, preferably a plasticizer uniformly impregnated. It can be made by feeding a sheet or a pulp fiber formed into a corrugated sheet with a grooved thermoforming roll through a central conical tubular portion of a double conical tube, and integrating it into a sea core type. This manufacturing method will be described with reference to FIG.

First, the sheath fiber material 42 is uniformly spread by a spreader 45, and a plasticizer such as triacetin is preferably uniformly applied by a delivery roll 46 to the first ring. By passing through the guide 7 and the second ring guide 8, the cross section is gradually expanded into an arc shape, is supplied into the outer tube of the double conical tube 15 while being formed into a cylindrical shape, 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, a nonwoven fabric or crepe paper, after passing through the guide 10 as shown in FIG. It is molded into a corrugated sheet by a molding device 13. The corrugating thermoforming device 13 is composed of two upper and lower rolls having a large number of processing grooves, the upper and lower grooves are meshed with each other, can be adjusted with a clearance of about 1 mm or less, and are heated and molded at a predetermined pressure and temperature. Any device can be used. 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.

In the case of a fiber material for a core portion which needs to be opened like a tow, it becomes like 41 and is uniformly spread by a spreader 11 by means of a delivery roll 12, preferably triacetin or the like. After the plasticizer is uniformly applied, the plasticizer is sent to the corrugating thermoforming device 13 and molded into a corrugated sheet. The corrugated sheet is pulled out by the extra roll 14, and the ring guides 7 and 8 are used.
Is supplied to the central circular tubular portion of the double conical tube 15 and is focused and integrated at the center of the fiber material of the cylindrical sheath portion. In the core or sheath, if necessary,
Charcoal is added and held as appropriate.

At the same time, the wrapping paper 3 supplied to the filter plug machine is coated with an adhesive at least at one end and 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 tobacco filter of the present invention 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 and a core of the filter element (B). By changing the combination of main fiber materials, harmful components contained in tobacco smoke can be removed relatively easily and with high efficiency. Further, as shown in FIGS. 5A and 5C, the dual structure filter of the present invention also has the structure shown in FIGS. 5B, 5D, 5E, and 5F.
As shown in the figure, the tobacco leaf cylinder 57 may be connected to either side of the filter element (A) or the filter element (B), and the harmful component removal performance and the flavor can be changed.

The double concentric composite dual structure tobacco filter of the present invention has a great feature in that harmful components in tobacco smoke can be removed with higher efficiency than conventionally developed filters.

[0021]

The present invention will be described in more detail with reference to the following examples. A plain filter type filter element (A) having a length of 10 mm was prepared from the fiber materials shown in Table 1 by a normal filter preparation method. On the other hand, the fiber material shown in Table 1 and the corrugated sheet serving as the core shown in FIG. 3 are P = 1.0 mm and d = 0.5 mm shown in FIG. 3 and have a circumference of 24.7 mm and a length of 10 mm. A structured filter element (B) was created. By combining the filter element (A) and the filter element (B), a dual-type filter as shown in FIG. 1 is made, which is connected to one end of a cigarette as shown in FIG. Tested. The results are shown in Table 1.

[Smoking conditions] Smoke absorption device: Constant flow type Smoke absorption time: 2 seconds / time Smoke absorption interval: 58 seconds Smoke absorption flow rate: 17.5 ml / second Smoke absorption frequency: 7 times / piece Mainstream smoke collection method: Cambridge filter CM- 113 Number of smoke absorption lines: 20 Analysis method: nicotine; ultraviolet spectrophotometry Other compounds; gas chromatography

[0023]

[Table 1]

For comparison, in the filter configuration of Experiment No. 4, when a filter was formed using a corrugated sheet having a groove pitch P of 4 mm in the core portion, the airflow resistance was 50 mmH.
₂ O nicotine removal rate 32.1%, tar removal rate 39.5
%, And a TPM removal rate of 44.3%.

[0025]

As described above, the tobacco filter having a dual structure of the present invention has a high performance of removing harmful components in tobacco smoke and can maintain a good flavor in spite of low airflow resistance.

[Brief description of the drawings]

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

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

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

FIG. 4 is a process chart showing an example of a manufacturing process of the filter element (B) of the tobacco filter of the present invention.

FIG. 5 is a longitudinal sectional view of an example of a tobacco with a filter to which the tobacco filter of the present invention is connected.

[Description of Signs] 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 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 Guite 11 Spreader 45 Spreader 12 Delivery roll 14 Delivery roll 46 Delivery roll 13 Corrugate roll 15 Double Conical tube

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Kitayama 3rd Kaigan-dori Toyama City, Toyama Prefecture Inside Mitsubishi Rayon Co., Ltd. (72) Inventor Eiichi Takase 3rd Kaigan-dori Toyama City Toyama Prefecture Toyama Business, Toyama (56) References JP-A-54-46900 (JP, A) JP-A-55-141185 (JP, A) JP-A-55-138385 (JP, A) JP-B-54-29600 (JP, B1)

Claims (1)

(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, A filter element (B) provided with a core made of a bundle of sheets obtained by corrugating a fiber material mainly composed of a long fiber crimped tow or a pulp fiber material inside a sheath portion.
A dual structure tobacco filter characterized by joining