JPS59203483A - Tobacco filter having dual structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dual-structure cigarette filter in which a filter element made of a fiber material molded into a plug shape and a filter element made of an air-impermeable material having a longitudinal space therethrough are joined. More specifically, outside air is introduced into a filter element made of a plug-shaped fiber material, and tobacco smoke and outside air are uniformly mixed within the space provided in the filter element made of an air-impermeable material. This invention relates to a napentylene filter that can be diluted, has an excellent aroma and taste, and has good filtering performance.

In recent years, due to changes in smoking tastes, there has been a demand for the development of cigarettes with a lighter smoking window.
In order to achieve these objectives, research and development of various cigarette filters has been progressing. High-filtration cigarette filters that have been developed so far include those that have increased the amount of R material filled in the cigarette filter, and those that have made the fibers that are filled in the cigarette filter finely modified and have a modified cross section. Some methods have increased the surface area of each fiber to increase the contact area with tobacco smoke, but these have been effective to some extent in removing particulate phase components in tobacco smoke, but they have been effective in removing gas vapor phase components. This method has almost no effect and has the disadvantage of inevitably increasing the suction resistance. The development of cigarette filters that have less of these drawbacks is also progressing.For example, cigarette filters have holes in them to introduce air from the outside to reduce the amount of cigarette smoke absorbed, and also to dilute the cigarette smoke with air. There is.

In the case of this general open-pore filter, in order to reduce harmful components at a high rate, fine fibers are densely packed, and the open-hole area is increased to reduce the amount of diluted air flowing in through the open-holes. It is believed that increasing the amount of gas is an effective method for reducing the particulate phase components and gas vapor phase components. But 1.
When this perforated filter is broken open and observed after smoking, it can be seen that on the mouth side of the perforated point, tobacco smoke passes through the center and diluted air passes through the periphery. This indicates that tobacco smoke and dilution air flow in a substantially separate state, and that the filter fibers in the air passage section do not sufficiently filter tobacco smoke.

In order to improve this, some types have the opening point closer to the mouthpiece side, and others have a recessed part on the mouthpiece side, but in the former case, the opening part is covered by the lips when smoking, and in the latter case, the opening part is covered by the lips. There is a problem with the shape stability when held in the hand, and both tobacco smoke and diluted air enter the smoker's mouth in a separated state.
It was difficult to obtain a sufficient aroma and flavor.

The present inventors have discovered a method that has a good mixing effect of tobacco smoke and diluted air.
As a result of our research with the goal of obtaining a cigarette filter with good filtration performance that provides a strong aroma and taste, we developed a filter element made of fiber material shaped into a plug, which is attached to the cigarette side and penetrates inside in the length direction. A dual-structure cigarette filter comprising a filter element made of an air-impermeable material having a space on the mouth side and joined with an air-permeable wrapping paper, the filter element being made of an air-impermeable material The cross-sectional area perpendicular to the length direction of the space penetrating the lengthwise direction is 30% or less, or 1.6%, of the cross-sectional area perpendicular to the length direction of the filter element made of tobacco or fiber material molded into a plug shape.
When the cigarette filter of the present invention consisting of the above-mentioned dual structure cigarette filter is connected to a cigarette using a permeable wrapping paper such as perforated wrapping paper, the original goal is achieved and an easy-to-smoke cigarette with low suction ventilation resistance is made possible. I discovered that.

An example of a side sectional view of the dual structure cigarette filter of the present invention connected to a cigarette is shown in FIG. After passing through the unburned tobacco part 1, the tobacco smoke S passes through the fiber material 70
It is filtered by a filter element 6 shaped like a lug, and reaches the smoker's mouth via a space 9 extending longitudinally.

On the other hand, the diluted air A enters the filter element 6, which is formed from a fiber material into a plug shape, through the opening 8, and reaches the smoker during the daytime via the space 9 penetrating in the length direction. The cross-sectional area perpendicular to the length direction of the space portion 9 penetrating in the length direction is 30% or less of the cross-sectional area perpendicular to the length direction of the tobacco shredded portion 1 or the filter element 6 formed from a fiber material into a plug shape, 1
．． It needs to be 6% or more.

Even if the space 9 is a flat space as shown in Fig. 1 or widened towards the mouth side as shown in Fig. 2, it still remains the same as shown in Fig. 3. The narrowest cross-sectional area needs to be within the above-mentioned range. If the cross-sectional area perpendicular to the length direction exceeds 30%, the mixing effect of tobacco smoke and diluted air will be insufficient, and the flavor will not improve, and if it is less than -L(i%), the It has high ventilation resistance and is difficult to breathe.

The filter element formed by molding the fiber material into a 70-lug shape used in carrying out the present invention includes, as the fiber material,
Long fiber tow such as acetate, polypropylene, rayon, crushed pulp, and linter.

It is possible to use crepe-processed paper, etc., and it is also possible to use paper that is formed into a plug shape using breathable wrapping paper, or one that is formed into a plug shape without using breathable wrapping paper and has air permeability. . In addition, as a filter element made of an air-impermeable material, in addition to plastics such as polyethylene, polypropylene, and polystyrene, air-impermeable materials such as metal and wood can be used; From the viewpoint of permeability, extrusion molded products of closed cell foam materials such as polyzolopyrene and styrene are most desirable.

The present invention will be explained in more detail with reference to Examples below.

Example First, as a comparative example, an acetate crimped tow with a single fiber fineness of 4 denier, a fiber cross-sectional shape of Y-shaped cross section, and a total fineness of 43,000 denier was prepared in the usual manner using ordinary plug wrapping paper. Tapakov 4) Rolled up into a letter 2
Sample A1 was prepared by cutting a piece to a length of 0 mm and connecting it to a commercially available cigarette "No Illite" from which part of the filter had been removed and a non-breathable wrapping paper.

Next, use the same acetate crimp tow as A1 in the usual way.
Wrap a cigarette filter with plug wrapping paper with an air permeability of 10 t/min, Crn2, 10 mH2O, cut it into 20-tone lengths, and cut it into 20-tone lengths. The sample connected with wrapping paper was designated as sample 71;2.

Next, with the dual structure tano 4-coil filter of the present invention,
The sample shown in the figure was connected with the same tubes and wires as Flat 1 and a perforated wrapping paper with three rows of holes, and this was used as a sample of Flat 3. Here, as a filter element made of fiber material molded into a 70-lug shape,
Yukuko filter similar to Bian 2, diameter 0.13+
The filter element made of a small, air-impermeable material is an extruded polystyrene foam with an outer diameter of 7.7 mm and a length of 10 mm, with a longitudinal center line in the center. There are two spaces with a diameter d penetrating through the fiber material, and the cross-sectional area perpendicular to the length direction of the spaces is such that the fiber material is shaped like a plug (
The cross-sectional area perpendicular to the length direction of the filter element is 67q6, and the air permeability is 30t.
/min・Crn2・10 t:m I used a dual-structure cigarette filter with H20 plug wrapping paper.

Next, the filter element made of an air-impermeable material of the shape 3 was processed into a flared shape at the end using a heated conical rod, and the shape shown in Fig. 2 was used as a sample of the eggplant 4. The processed product with the shape shown in FIG. 3 was designated as an A5 sample.

These five types of samples were smoked at a flow rate of 17% using a constant flow type automatic smoking machine.
．． Automatic smoking was performed under the following conditions: 5 m27 seconds, smoking time 2 seconds, smoking interval 58 seconds, cigarette combustion length 50 cigarettes, and analyzed what was captured in the filter element part made of fiber material shaped into a plug shape and the Cambridge filter, Removal rates and amounts of TPM, tar, and nicotine were determined. Also the same 5
Various types of samples were automatically smoked in a constant volume automatic smoking machine under the conditions of 35 m1/sec, smoking time 58 seconds, and cigarette combustion length 50 seconds, and the amount passing through the Cambridge filter was analyzed to determine the amount of carbon oxide. Quantitated. In addition, the suction ventilation resistance is the total pressure loss in water column when the suction air flow rate is 17.5 m27 seconds, and the air permeability is the amount of air that passes in 1 min under a differential pressure of 10 mm H2O. The air dilution rate was expressed as the ratio of the amount of air directly flowing into a portion of the cigarette filter from the outside to the total suction air flow rate, as measured using a vOM type ventilation tester manufactured by Filtrona.

The measurement and analysis results are shown in Table 1, and it can be seen that the dual structure cigarette filter of the present invention enables cigarettes with excellent filtration efficiency, low suction ventilation resistance, and easy to smoke. . After a long period of smoking, the cigarette filter was split vertically and observed, and it was found that a large number of filter fibers contributed to the filtration of tobacco smoke. Furthermore, as a result of a comparative smoking test of the A2 sample and the A3, A4, and A5 samples, the same smoking sensation was obtained despite the fact that the amounts of tar and nicotine passed through were small.

[Brief explanation of drawings]

1, 2, and 3 all show side sectional views of the dual-structure cigarette filter of the present invention using perforated wrapping paper and connected to a cigarette.
... Dilution air, d... Diameter of the space passing through in the length direction, 1... Tobacco cut part, 2... Cigarette wrapping paper, 3
... Perforated wrapping paper, 4... Air permeable wrapping paper, 5... Air permeable wrapping paper, 6... Filter element made of fiber material, 7... Filter made of air impermeable material. Element, 8... Opening part, 9... Space part. Patent Applicant Mitsubishi Acetate Co., Ltd. Patent Applicant Mitsubishi Rayon Co., Ltd. Representative Patent Attorney 1) Takeshi Mura Stroll Figure 1 Figure 2 Figure 3 Procedural Amendment (Voluntary) August 2, 1980 Commissioner of the Patent Office Kazu Wakasugi Mr. Husband 1. Indication of the case 1982 Patent Application No. 76199 2 Name of the invention Dual structure cigarette filter 3 Relationship to the case by the person making the amendment Patent applicant Mitsubishi, 2-3-19 Kyobashi, Chuo-ku, Tokyo (621) Acetate Co., Ltd. - President Tsugube Kato (1 other person) Osamu Tsunyo 2-8-1-6 Toranomon, Minato-ku, Tokyo Specification subject to amendment 7 Contents of amendment (1) Specification tube, 2 articles 1-chome "10th H20" was corrected to "10αH20" (2) Deletion of "10 times the value of IqT-10" in No. 10 of the specification.

Claims (1)

[Claims] 1. A filter element made of a plug-shaped fiber material is disposed on the tobacco side, and a filter element made of an air-impermeable material and having a longitudinal space therethrough is disposed on the mouthpiece side. a dual structure cigarette filter joined by an air-permeable paper wrapper, wherein the cross-sectional area perpendicular to the length of the longitudinal space in the filter element of the air-impermeable material is or 30% of the cross-sectional area perpendicular to the length direction of a filter element made of fiber material shaped into a plug shape.
A dual structure cigarette filter 2 characterized in that the filter element made of the air-impermeable material has a longitudinally penetrating space that widens toward the mouthpiece side. A dual structure cigarette filter 3 according to claim 1, characterized in that the longitudinally penetrating space provided in the filter element made of the air-impermeable material is expanded to the tobacco side. The dual structure cigarette filter according to claim 1, characterized in that the filter expands toward the end.