JPH06169743A - Tobacco filter having dual structure - Google Patents

Abstract

PURPOSE:To obtain a tobacco filter having light smoking feeling and good smoking taste in spite of having high removal efficiency of tar and nicotine in smoke. CONSTITUTION:This tobacco filter having dual structure is obtained by binding a plane type filter element (A) to a filter element (B) obtained by housing a bundled corrugated sheet-like material in the sheath part consisting of a cylindrical filter made of a tow-like filament bundle.

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 circle composite filter material, and more specifically, a part of the filter having the dual structure has a sheath core type structure. By having a fiber material molded into a corrugated sheet in the core part, the removal efficiency of harmful components contained in cigarette smoke is high, and smokers are not required to have an excessive suction force, and when smoking The present invention relates to a double concentric dual structure tobacco filter having an extremely good flavor and taste.

[0002]

2. Description of the Related Art Hitherto, in order to solve the problem of the health hazard caused by smoking cigarettes, the removal efficiency of harmful components contained in cigarette smoke is high, and the suction resistance when smoking is not great. The development of filters for obtaining cigarettes with a good taste is in progress. As a filter that can improve the removal efficiency of harmful components contained in cigarette smoke, those with an increased filling amount of the filter material filled in the filter, or those with a longer filter,
Alternatively, it has been proposed that the filter material is made finer or the filter material is made to have an irregular cross-section, etc., and these filters should increase the contact area between smoke particle components and the filter material during smoking. However, the tobacco filter produced by these methods has a defect that the suction resistance during smoking is increased and the smoking feeling is impaired.
As a cigarette filter that does not impair smoking sensation, the flow of cigarette smoke is diluted with ventilation air outside the filter to reduce the amount of particulate matter that is sucked into the smoker's mouth. Effective filters have been developed.

However, reducing the harmful components contained in the 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 cigarette filter with few such problems, for example, Japanese Patent Publication No. 63-6099.
No. 1 discloses a tobacco which is obtained by adding pulverized pulp mainly composed of cellulose to a tow-shaped fiber bundle that has been uniformly opened, and then consolidating the sheet-like material formed into a corrugated sheet by a corrugated thermoforming device into a bar shape. A filter is shown, and Japanese Patent Publication No. 58-6467 discloses two or more kinds of fiber materials.
Cigarette filters are shown, one for the outer tube of the double conical tube and the other for the central circular tubular section for focusing into a sheath core structure.

[0004]

[Problems to be Solved by the Invention] Japanese Patent Publication No. 63-6099
The filter disclosed in Japanese Patent Publication No. 1 is difficult to enhance the filtration efficiency of the particle component in the smoke flow of the filter because the filling amount of the filter material packed in the corrugated sheet is large. On the other hand, Japanese Patent Publication Sho 58
The filter disclosed in Japanese Patent No. 6467 is not yet sufficient as a filter that can maintain the balance between the filtration efficiency of the particulate component in the smoke stream and the flavor and taste during smoking.

[0005]

[Means for Solving the Problems]
In view of such circumstances, as a result of diligent studies, a filter material (A) made of long fiber tow and a filter material (B) using a corrugated sheet in the core portion of a sheath core structure filter material are used. The present invention has been completed by finding that the above-mentioned problems can be solved by using a joined dial structure. The gist of the present invention is to provide a filter element (A) in which a fiber material mainly composed of long-fiber crimped tow is wound around a plug, a fiber material mainly composed of long-fiber crimped tow of a sheath part, and a core part The fiber material mainly composed of the long fiber crimped tow or the double concentric circular composite dual structure in which the filter element (B) having the sheath core structure in which the pulp fiber material is molded into the corrugated sheet is integrated. It's in a cigarette filter.

FIG. 1 is a vertical sectional view of an example of the dual structure cigarette filter of the present invention, and FIG. 2 is a horizontal sectional view of the filter element (B). In the figure, A is a cross-sectional view of the filter element (A), and 5 is a columnar molding of a fiber material mainly comprising long fiber crimped tow which is a filter material for smoke, which constitutes the filter element (A). It is a thing. The filter element (A) has substantially the same structure as a plain filter that has been conventionally used as a cigarette filter. In FIG. 1, B is a cross section of the filter element (B),
Reference numeral 1 denotes a converging body portion of a corrugated sheet which constitutes the core portion of the filter element (B), and 2 denotes a sheath portion which is provided on the outer periphery of the core and is made of a long fiber crimp tow cylinder. Reference numeral 3 is a wrapping paper, and 4 is an opening portion for giving a ventilation effect to the filter chip.

The corrugated sheet forming the core portion of the filter element (B) is a sheet having a cross-sectional structure as shown in FIG. 3, in which the groove depth d is 0.2 to 2 mm and the groove pitch P is 0.5 to 3 mm. It is composed of a corrugated sheet-like material having grooves. The corrugated sheet-like material having a wave pitch P outside the range of 0.5 to 3 mm and a depth d outside the range of 0.2 to 2 mm needs to be folded into a circular rod to form a core. As the moldability of the product decreases, the mixing ratio of the flavor and taste component and the particulate matter in the smoke flow filtered by the corrugated sheet-like product deviates from an appropriate value, and the flavor and taste are good and the particulate component is suitable. It cannot be a tobacco filter that can be removed.

The corrugated sheet of the core portion which constitutes the double concentric circle composite structure filter element (B) of the present invention is
A sheet material made of polyolefin fiber, polyester fiber, polyamide fiber, cellulose acetate fiber, pulp, etc. as a sheet material. As the sheet material, a long fiber crimped tow is formed into an open sheet, a short fiber. It is possible to use a sheet-shaped material, a non-woven fabric, or the like made of the aggregate of the above. In particular, in order to obtain a cigarette filter having a good flavor and taste, it is preferable to use a corrugated sheet made of cellulose acetate fiber tow or crepe paper.

A preferred method for producing the filter element (B) of the present invention is to uniformly open a fiber material mainly composed of long-fiber crimped tow, and preferably after uniformly impregnating a plasticizer, a double layer is used. It is supplied to the outer tube of the conical tube and bundled into a cylindrical shape, and a tow-shaped fiber bundle is uniformly spread as a core fiber material in this cylindrical material, preferably a fiber sheet shape in which a plasticizer is evenly attached. It can be made by forming a corrugated sheet by using a grooved thermoforming roll with a grooved thermoforming roll, feeding it through the central conical tubular part of a double conical tube, and integrating it into a sheath core type. The manufacturing method will be described with reference to FIG.

First, the fiber material 42 for the sheath portion is opened by the fiber opening device 45.
With the deliberry roll 46 uniformly applied with a plasticizer, preferably triacetin, in a state where the fibers are evenly opened by, the cross-section is gradually increased by passing through the first ring guide 7 and the second ring guide 8. Is expanded in an arc shape, is supplied to the outer tube of the double conical tube 15 while being molded into a cylindrical shape, and is focused into a cylindrical shape. This ring-shaped guide 7, 8
Are preferably arranged so that the radius is gradually reduced, whereby the thickness of the sheath layer of the filter can be made uniform and the shape of the cylindrical body can be made uniform.

On the other hand, when the core fiber material is a material that does not need to be opened, for example, a non-woven fabric or crepe paper, the state shown in 9 is used as a guide.
After passing through 10, the corrugated thermoforming device 13 forms a corrugated sheet. The corrugated thermoforming device 13 is composed of upper and lower two rolls having a large number of processing grooves,
Any device may be used as long as 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 heat-molded at a predetermined pressure and temperature. The corrugated sheet may be pulled out by the extra roll 14, passed through the ring guides 7 and 8, and then fed 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 when it is uniformly opened by the opening device 11, it is preferably plasticized by the delivery roll 12 such as triacetin. After uniformly applying the agent, it is sent to the corrugated thermoforming device 13 and molded 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, and is fed to the central portion of the cylindrical sheath fiber material. Focused and integrated.

At the same time, the wrapping paper 3 supplied from the filter plug machine is coated with an adhesive on at least one end edge thereof, is wrapped around the outer periphery of the sheath core type filter material, and is joined with the end portion thereof, and then is cut by a cutter. The double concentric circular composite structure tobacco filter element (B) of the present invention can be obtained by cutting it into a long length.

As the material forming the filter element (A) and the material forming the sheath portion of the filter element (B) of the present invention, cellulose acetate fiber, polyolefin fiber, polyester fiber, rayon fiber or the like can be used.

The double concentric circular composite dual structure cigarette filter of the present invention comprises a fiber material mainly composed of the long fiber crimped tow of the filter element (A) and a long fiber wound of the filter element (B) having a sheath portion and a core portion. A major feature is that the harmful components contained in the cigarette smoke can be removed relatively easily and with high efficiency by changing the combination of the fibrous materials mainly of curled tow. Further, the dual structure filter of the present invention is included in the cigarette smoke depending on which side of the filter elements (A) and (B) the cigarette cylinder 57 is connected to, as shown in FIGS. The ability to remove harmful components and the flavor and taste can be changed.

The filter element (A) constituting the dual-structure filter of the present invention may be a plain type filter as shown by A in FIG. 1, but charcoal 58 is added as shown in FIG. 5 (C). However, it is also possible to use a wound one. As the fiber material constituting the filter element (A), a long fiber crimp tow made of rayon, vinylon, polyolefin, cellulose acetate or the like can be used. Considering the flavor and the high filtration efficiency which are the objectives of the present invention, it is preferable to use cellulose acetate fibers.

The filter element (B), which is another constituent of the dual structure filter of the present invention, has a sectional structure as shown by B in FIG. As the sheath portion 2 of the filter element (B), a long fiber crimp tow made of the same fiber material as the filter element (A) can be used. Considering the flavor and high filtration efficiency which are the objectives of the present invention, it is preferable to use cellulose acetate fibers. Further, as shown in FIG. 5D, charcoal added may be used. Filter element (B)
As the corrugated fiber material 1 to be the core part of the above, if necessary, a long fiber crimped tow or short fiber aggregate made of polyolefin, polyester, polyamide, cellulose acetate, pulp or the like, or a non-woven fabric thereof may be used. It is possible to use a sheet which has been subjected to pressure molding by a corrugated thermoforming device after adding a plasticizer and grooved. Considering the flavor and high filtration efficiency which are the objectives of the present invention, it is preferable to use a cellulose acetate fiber or a sheet-like material molded from crepe paper. Further, as shown in FIG. 5 (e), it is possible to use the one to which charcoal is added. Further, charcoal may be added to both the sheath part and the core part of the filter element (B).

The double concentric circle composite dual structure cigarette filter of the present invention has a great feature in that it can remove harmful components in cigarette smoke with high efficiency, as compared with the conventionally developed filter.

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

[0020]

EXAMPLE The cross section of the fiber material shown in Table 1 and its core corrugated sheet is p = 1.0 mm, d = 0.
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 in a sheet state such as 5 mm. On the other hand, a plain filter-like filter element (A) having a length of 10 mm was prepared by an ordinary method for preparing a filter. By combining the filter element (A) and the filter element (B), a dual type filter as shown in FIG. 1 is made, and this is connected to one end of a cigarette as shown in FIG. 3 (b) and smoking under the following conditions. Tested. [Smoking conditions] Smoke equipment: Constant flow type Smoke absorption time: 2 seconds / cycle Smoke interval: 58 seconds Smoke flow rate: 17.5 ml / sec Smoke frequency: 7 times / mainstream smoke collection Method: Cambridge filter CM-113 Smoke absorption number: 20 Analysis method: Nicotine; UV spectrophotometric method Other compounds; Gas chromatographic method

[Table 1] From the results shown in Table 1, although the tobacco filter having the dual structure of the present invention has a low ventilation resistance, it has a high removal performance of harmful components in the tobacco smoke, and a tobacco which can maintain a good flavor and taste. You can see that it is a filter.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a tobacco filter of the present invention.

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

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

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

FIG. 5 is a cross-sectional view of a dual structure filter of the present invention.

[Explanation of symbols]

 A ……… Filter element (A) B ……… Filter element (B) 1 ……… Core part of filter element (B) 2 ……… Sheath part of filter element (B) 3, 6 ……… Wrapping paper 4 … Ventilation holes 5 ……… Filter part of filter element (A) 57 ……… Tobacco cylinder part 7, 8 ……… Ring guide 41 ……… Long fiber tow fiber bundle 42 ……… Long Fiber Tow fiber bundle 9 ………… Crepe paper 10 ………… Guite 11, 45 ……… Opening device 12, 46, 14 ……… Delivery roll 13 ……… Corrugated roll 15 ……… Double conical tube

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Kitayama 3 Kaigan Dori, Toyama City, Toyama Prefecture Mitsubishi Rayon Co., Ltd. Toyama Plant (72) Inventor Eiichi Takase 3 Kaigan Dori, Toyama City, Toyama Prefecture Mitsubishi Rayon Co., Ltd. Toyama Office

Claims (1)

[Claims] 1. A filter element (A) in which a fiber material mainly composed of long fiber crimped tow is wound up on a plug, and a sheath portion in which the fiber material mainly composed of long fiber crimped tow is formed into a cylindrical shape, It is characterized in that a fiber material mainly composed of long-fiber crimp tow or a filter element (B) provided with a core member made of a bundle of sheet-like products obtained by corrugating pulp fiber material is joined inside the sheath portion. A dual structure cigarette filter that