JPH0523158A - Cigarette filter - Google Patents

Abstract

PURPOSE:To provide the subject filter which has a low filtration part on the suction side comprising a fiber bundle and a hollow tube arranged at the center of the fiber bundle, a high filtration part comprising only a fiber bundle through a hollow chamber on the side of a cigarette, and vent holes on the chamber, which is reduced in the amounts of nicotine and tar fed to an oral cavity and which does not deteriorate the smoking taste of the cigarette. CONSTITUTION:A cigarette filter having a paralleled filament bundle and a hollow tube made of a gas-impermeable material comprises a low filtration part A on the suction side comprising a fiber bundle 2 and a hollow tube 1 arranged at the center of the fiber bundle, a high filtration part B comprising only a fiber bundle through a hollow chamber D on the side of a cigarette, and having vent holes 7 for feeding dilution air on the chamber.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cigarette filter in which the amount of nicotine and tar introduced into the oral cavity is small and taste is not impaired.

[0002]

2. Description of the Related Art In recent years, various measures have been taken to reduce the outflow (hereinafter referred to as delivery) of nicotine and tar into the oral cavity during smoking, mainly in developed countries, in relation to the effects on the health of tobacco. However, on the other hand, reducing nicotine and tar delivery was a contradiction of deteriorating aroma and flavor, which is an important factor as a favorite product of tobacco.

Therefore, an improved cigarette filter has been developed to solve this contradiction (Japanese Patent Laid-Open No. 59-1960).
No. 82). This improved cigarette filter is shown in FIG.
As shown in Fig. 2, a portion A in which the hollow tube 1 is arranged in the center of the fiber bundle 2
Is a filter having a dual structure in which the portion B consisting only of the fiber bundle 6 is arranged on the side of the cigarette C, and the portion B consisting only of the fiber bundle is first filtered of the cigarette smoke to obtain a concentrated filter with a low degree of filtration. The smoke is introduced from the hollow tube 1 and the smoke having a high degree of filtration is introduced into the oral cavity from the fiber bundles 2 in the peripheral portion of the hollow tube 1, thereby satisfying the smoker's demand for flavor and taste. As a result, the delivery of nicotine and tar can be reduced. In FIG. 4, reference numeral 3 is a primary wrapping paper made of breathable paper, reference numeral 4 is a secondary wrapping paper made of breathable paper, reference numeral 5 is an outer wrapping paper made of non-breathable chip paper, and reference numeral 7 is a vent. It is a hole.

[0004]

However, in such a conventional cigarette filter, the concentration of tobacco smoke introduced from the hollow tube 1 into the oral cavity is such that the tobacco smoke in the portion B having only the fiber bundle 6 is filtered. Even if the vent hole 7 is provided on the filter, the dilution air does not contribute to the adjustment of the tobacco smoke concentration introduced from the hollow tube 1 into the oral cavity even if the vent hole 7 is provided on the filter. Therefore, although the concentration of tobacco smoke introduced into the oral cavity from the hollow tube 1 is a factor that greatly affects the taste, it is difficult to finely adjust it, and the concentration becomes high in general, and the stimulating sensation and bitterness are increased. Bring to smokers,
There was a tendency to impair the balance of flavor and taste.

The present invention has been made in view of the above circumstances, and its purpose is to suppress the delivery of nicotine and tar and the amount of carbon monoxide generated as much as possible without impairing the flavor and mellowness brought about by smoking. It is to provide a cigarette filter capable.

[0006]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to achieve the above-mentioned object, and as a result, when a filter has a specific triple structure, tobacco smoke introduced from a hollow tube into the oral cavity It was discovered that the concentration can be finely adjusted, nicotine / tar delivery can be suppressed to a low level, and appropriate taste can be imparted, and the cigarette filter having the triple structure was completed.

The present invention is a cigarette filter comprising aligned long fiber bundles and a hollow tube made of a non-air-permeable material, wherein a low filtration portion having a hollow tube arranged at the center of the fiber bundle is provided on the suction side. It is characterized in that it has a highly filtered portion consisting only of fiber bundles on the tobacco side through a hollow chamber, and has a vent hole for introducing dilution air onto the chamber.

[0008]

The cigarette smoke during smoking passes through the high filtration section and is introduced into the chamber. At this time, dilution air is introduced into the chamber from the vent hole.

Since the dilution air introduced into this chamber is so high in velocity, the cigarette smoke is well agitated and mixed with the dilution air in the chamber to a proper concentration. Most of the tobacco smoke stirred and mixed with the diluted air reaches the oral cavity through the hollow tube, and the remaining tobacco smoke is introduced into the oral cavity through the fiber bundle around the hollow tube.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on the illustrated embodiments. The Cigareo filter of the present embodiment comprises long fiber bundles 2 and 6 aligned as shown in FIG. 1 and a hollow tube 1 made of an air-impermeable material, and the hollow tube 1 is provided at the center of the fiber bundle 2.
Has a low filtration portion A on the suction side, a high filtration portion B consisting only of the fiber bundle 6 on the cigarette C side through a hollow chamber D, and a vent hole 7 on the chamber D. It is configured.

The long fiber bundles 2 and 6 used here include regenerated fibers such as rayon, semi-synthetic fibers such as cellulose acetate, and synthetic fibers such as polypropylene. The cellulose acetate fiber used in the filter is particularly suitable in terms of flavor and taste.

Further, as the non-breathable material used for the hollow tube 1, plastic plastics such as vinyl chloride resin, polyethylene resin, polypropylene resin can be advantageously used.

The low filtration portion A is conventionally known (Japanese Patent Laid-Open No. 54-54).
It is manufactured by the method of JP 37900). That is, the low filtration portion A is supplied by aligning the long hollow tube 1 with the flowing direction of the long fiber bundle 2 aligned from the insertion guide made of a thin metal tube, and wrapping the outer circumference thereof with the wrapping paper 3. The rod-shaped fiber-filled body can be manufactured by winding it with an endless belt and fixing the wrapping paper 3 by gluing it, and cutting it to a certain size with a cutter.

Further, the high filtration portion B can be obtained by cutting the rod-shaped fiber packing obtained by the same method as the low filtration portion A except for the loading of the hollow tube 1 into a certain size.

The wrapping paper 3 used at this time is called a primary wrapping paper and may be a non-air permeable paper. However, when a vent hole is provided in each filtration portion A or B or both portions A and B, it is air permeable. Use good paper.

The low filtration portion A and the high filtration portion B thus obtained are connected by the secondary wrapping paper 4 having good air permeability. This connection is performed with a proper gap between the low filtration portion A and the high filtration portion B, and the gap can be formed in the chamber D by the connection. A filter chip is constituted by this, and the total length of this filter chip is suitably 15 to 35 mm, and the size of each element is determined as follows.

Since most of the tobacco smoke is filtered in the high filtration portion B, it is appropriate that the length of the high filtration portion B is 5 to 15 mm in order to fully exhibit this filtering function. On the other hand, the length of the low filtration portion A is preferably 10 to 20 mm considering the ease of production and the length of the entire filter, and the inner diameter of the hollow tube 1 at this time is 0.3 to 3.5.
mm is appropriate, and if it is thinner than this, a sufficient amount of smoke does not pass through the tube, so the flavor and taste are not sufficient, and if it is thick, the filtering function of the entire filter deteriorates. Further, the gap between the two filtration parts A and B (width of the chamber D) is preferably 1 to 10 mm in consideration of the accuracy of the manufacturing machine, the strength of the filter, and the like.

The filter tip is connected to the cigarette C by the outermost wrapping paper 5. At this time, the filter chip is connected so that the high filtration portion B faces the cigarette C side and the low filtration portion A faces the suction side. As the wrapping paper 5, a non-air-permeable tipping paper is used, and the wrapping paper 5 has a vent hole 7 at a position corresponding to the chamber D. The vent hole 7 may be formed not only by preliminarily piercing the wrapping paper 5 but also by piercing a portion corresponding to the chamber D of the filter chip after the filter tip is connected to the cigarette by the wrapping paper 5.

The flow of air and cigarette smoke during smoking of the filter-attached cigarette of this embodiment thus formed is shown in FIG. The cigarette smoke moves to the filter tip side together with the air a and b sucked during smoking. The tobacco smoke reaching the filter chip is introduced into the chamber D after being filtered while passing through the high filtration portion B. Vent hole 7 to chamber D
Since the dilution air c introduced into the is very high speed, the tobacco smoke is well agitated and mixed with the dilution air c and has a proper concentration. The concentration of tobacco smoke at this point is determined by the filtration degree of the high filtration portion B and the introduction ratio of the dilution air c (hereinafter, referred to as ventilation ratio).

Most of the tobacco smoke stirred and mixed with the diluted air c reaches the oral cavity through the hollow tube 1, and the remaining tobacco smoke collects the fiber bundle 2 around the hollow tube 1 in the low filtration portion A. It passes and is introduced into the oral cavity.

As a result, tobacco smoke having a low degree of filtration and a rich taste flows into the mouth of the smoker from the mouthpiece, and tobacco smoke having a high degree of filtration flows into the periphery. At this time, the tobacco smoke distribution ratio to the hollow tube 1 and its peripheral portion is determined by the fiber bundle packing amount in the peripheral portion and the tube inner diameter. This makes it possible to reduce the outflow of nicotine and tar as a whole while satisfying the smoker's demand for flavor and taste.

The vent hole 7 can be provided not only on the chamber D but also on either the low filtration portion A or the high filtration portion B, or both portions.

Experimental Example Specimen Present Invention 1: Single fiber fineness 2.1 denier, cross-sectional shape Y
Type, using a cellulose acetate crimped fiber bundle with a total fineness of 25,000 denier and a vinyl chloride resin hollow tube (internal diameter 1.5 mm), create a filter plug in which the hollow tube is placed in the center, length 14 mm (Low filtration part A). In addition, single fiber fineness 2.2 denier, cross-sectional shape Y
Using a cellulose acetate crimped fiber bundle having a mold and a total fineness of 40,000 denier, a filter plug having a homogeneous structure was prepared by a usual cigarette filter plug manufacturing method, and cut into a length of 10 mm (high filtration portion B). When joining both of them with perforated paper, a gap (chamber D) having a length of 1 mm is provided to make a filter chip having a total length of 25 mm, and a vent hole is further provided on the chamber D, which is manufactured by Japan Tobacco Inc. A commercially available mild seven tobacco column was connected to prepare a sample cigarette.

Product 2 of the present invention: The length of the low filtration portion A of the product 1 of the present invention was cut to 10 mm, and the same portion as the product 1 of the present invention was used for the high filtration portion B, and both were joined with perforated paper. At this time, a gap (chamber D) having a length of 5 mm is provided and joined, and the total length is 25
I made a mm filter tip. In this filter,
As in the case of the product 1 of the present invention, a vent hole was provided and a mild seven tobacco column was connected to prepare a sample cigarette.

Comparative product: As shown in FIG. 3, a cellulose acetate crimped fiber bundle 6 having a single fiber fineness of 2.2 denier and a total fineness of 40,000 denier was used, and a homogeneous structure was produced by a usual cigarette filter plug manufacturing method. A filter plug having a length of 25 mm was prepared by cutting the filter plug of the above. Inventive product 1 in this filter
A vent hole 7 was provided so that the same nicotine and tar delivery as in Example 1 was obtained, and a mild seven tobacco column was connected as in the case of the product 1 of the present invention to prepare a sample cigarette. In FIG. 3, reference numeral 3 is a primary wrapping paper, and reference numeral 5 is an outermost wrapping paper.

Test Method The air resistance, ventilation rate, nicotine, tar and carbon monoxide were measured by the following methods using the above-mentioned test sample. I. The ventilation resistance was measured by measuring the pressure loss (mmH ₂ O) when the flow rate of air passing through the filter plug or filter tip to be measured was 17.5 ml / sec with a ventilation resistance measuring device (manufactured by Kato Industry Co., Ltd.). B. The ventilation rate was measured with a ventilation meter (Shinkai 54-112005). C. The quantification of nicotine and tar is based on the notification of the Ministry of Finance, based on the fixed volume automatic smoking device (RM, Borgwaldt, Germany).
20 / CS), the flow rate is 17.5 ml / sec, the number of smoke absorption is once per minute, the smoking time is 2 sec (35 ml), and the smoking length is 50 mm.
The smoke and the tar in the smoke that has passed through the filter are collected by a glass fiber filter (Cambridge filter), the tar amount is measured by the gravimetric method, and the nicotine amount is measured by a gas chromatograph (Hitachi, G-3, 0
00). D. Determination of carbon monoxide was carried out by applying a non-dispersive infrared carbon monoxide measuring instrument (Ultramat-1 of Borgwaldt, Germany) to the gas component obtained by removing all particle components from the mainstream smoke after smoking. The ventilation rate is obtained from the following equation. Ventilation rate (%) = c / (a + b + c) × 100 a: Inflow amount of air entering from the top (tip of the tobacco column) (FIG. 2) b: Inflow amount of air entering from the side of the tobacco column (FIG. 2) c: Amount of inflow of air from the vent hole (Fig. 2) Further, the tar and nicotine filtration rate (removal rate) is the amount of tar and nicotine adhering to the filter body (Tt and Tn, respectively) after smoking, and the smoking device. The amount of tar and nicotine attached to the Cambridge filter for collecting smoke components (each C
t and Cn) were measured, and the removal rate of each filter was calculated using the following equation. Tar removal rate (% by weight) = Tt / (Tt + Ct) × 100 Nicotine removal rate (% by weight) = Tn / (Tn + Cn) × 100 Regarding the flavor and taste, the filter was bonded to the mild seven tobacco column by the above method. The cigarettes were used as test cigarettes and evaluated by a sensory test panel of 5 persons. The evaluation was divided into 3 classes and shown by the right symbol. No change from the comparative product: △ Slight flavor and aroma compared to the comparative product: × Rich aroma and flavor relative to the comparative product: ○

The measurement results in results the test are shown in Table 1.

[Table 1]

As is clear from Table 1, when the product of the present invention has the same nicotine and tar delivery, a richer taste is obtained than the comparative product. This suggests that the nicotine and tar delivery of the product of the present invention, which has the same level of taste as the comparative product, may be lower than that of the comparative product. In addition, the amount of carbon monoxide generated in cigarettes connected to this filter is significantly reduced compared to the comparative product having the same nicotine tar delivery.

[0029]

When the cigarette filter according to the present invention is used, when the nicotine and tar delivery are made equal to those of conventional commercial cigarettes, the amount of rich tobacco smoke flowing into the oral cavity from the hollow tube is reduced to that of the conventional cigarette. Cigarettes with a deeper taste can be obtained, and smokers are not given spiciness or bitterness.

Further, when the nicotine and tar delivery are made equal to those of the conventional commercial tobacco, the ratio of dilution air flowing from the vent hole to the tobacco smoke can be increased as compared with the conventional commercial tobacco. The amount of harmful gas components such as carbon oxide can be reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a cigarette with a filter using the filter of the present invention.

FIG. 2 is a schematic diagram showing how air and tobacco smoke flow when smoking a cigarette using the filter of the present invention.

FIG. 3 is a sectional view of a comparative product used in an experiment.

FIG. 4 is a cross-sectional view of a conventional cigarette with a filter.

[Explanation of symbols]

 1 hollow tube 2,6 fiber bundle 3,4,5 wrapping paper 7 vent hole A low filtration part B high filtration part C tobacco column D chamber

Claims (1)

Claim: What is claimed is: 1. A cigarette filter comprising a bundle of aligned long fibers and a hollow tube made of an air-impermeable material,
The low filtration part where a hollow tube is placed in the center of the fiber bundle is on the suction side,
A cigarette filter having a highly filtered portion composed of only fiber bundles on a tobacco side through a hollow chamber and having a vent hole for introducing dilution air onto the chamber.