JPS60221069A - dual structure cigarette filter - 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 [Technical Field] The present invention relates to a pentillation cigarette filter that has low ventilation resistance during smoking and is easy to smoke.

[Prior art]

In recent years, due to changes in preferences for smoking, there has been a desire to develop cigarettes with a lighter smoking sensation, and in order to achieve this objective, research and development of various cigarette filters has been progressing.

To this end, we have improved the filtration properties of cigarette filters,
Many products have been developed and put into practical use, including those that reduce tar and nicotine, and those that dilute tobacco smoke by introducing external air through the cigarette or cigarette filter.

Examples of ways to improve the filtration characteristics of cigarette filters include increasing the amount of P material filled in the cigarette filter, making the fibers that make up the cigarette filter finer and increasing the specific surface area, and improving the specific surface area of the cigarette filter. There are products that have densely arranged fibers and increased filtration area, but the first two have higher ventilation resistance when smoking,
Furthermore, both methods have little effect on reducing gas components such as CO and NOx. On the other hand, cigarette paper that introduces outside air by making it breathable has excellent effects such as dilution of tobacco smoke with outside air, reduction in the amount of tobacco smoke generated, and diffusion of gas components to the outside. However, as smoking progresses, this effect decreases, and there is a large difference in taste between the beginning and end of smoking.

In other words, it has the disadvantage that it is light but not enough at the beginning of the suction, but becomes stronger at the end of the suction. It is preferable to use a cigarette filter that takes in air from a portion of the cigarette, as this will reduce the change in smoking taste, but in any case, on the mouth side of the part that takes in air, both tobacco smoke and diluted air are absorbed into the tobacco stick or into the cigarette. Because it passes through the filter, a certain amount of suction ventilation resistance is generated, and it is quite difficult to reduce this to 50 mH2O or less with an acetate plain filter. To improve this, various types of cigarette filters have recently been developed in which a groove space is provided on the outer periphery of the cigarette filter and ventilation/chillation air is allowed to flow through this groove space.
7-29147.57-29148.56-The main purpose of cigarette filters with these groove spaces is to improve smoking taste by separating tobacco smoke and ventilation/air, but this improvement in smoking taste is It is not clear how this is achieved. The inventor of the present invention believes that a decrease in suction ventilation resistance is one of the causes, and has placed a low ventilation resistance filter on the mouth side, a high ventilation resistance filter on the cigarette side, and an opening point in the low ventilation resistance filter section. We confirmed that the installed cigarette filter enables cigarettes with a small difference in the taste at the beginning and end of smoking (and low suction ventilation resistance), provides an improved taste, and is a more practical technology. , completed the invention.

[Purpose of the invention]

The object of the present invention is to produce a low-tar, low-nicotine cigarette filter with low ventilation resistance during smoking (with little difference in taste between the beginning and end of smoking).

[Structure of the invention]

That is, the gist of the present invention is that the length is 12 on the mouth side.
．． A filter plug made of an acetate fiber aggregate with a diameter of 5 mm or more and an airflow resistance of 25 mm or less, or tb) a non-wrap filter plug wrapped in high-porosity wrapping paper, is arranged on the tobacco side, Airflow resistance is 25H,
This is a dual-structure cigarette filter that has 0 or more filter plugs and dualizes them with high-porosity wrapping paper.

The present invention will be explained below with reference to the drawings.

FIG. 1 shows an example of a side sectional view of the dual-structure cigarette filter of the present invention connected to a cigarette. After passing through the unburned tobacco section 1, the tobacco smoke 1O passes through the high airflow resistance filter section 2 and the low airflow resistance filter section 3 to reach the smoker during the day. On the other hand, the dilution air 11 is
The flow enters through the opening 9 of the filter, passes through the high-porosity wrapping paper 7 for dualization, and the high-porosity wrapping paper 6 of the low ventilation resistance filter used as necessary, and flows along the outer periphery of the low ventilation resistance filter section 3. , during the day of the smoker.

The low ventilation resistance filter section 3 needs to have a length of 12.5 mm or more so that the openings 9 are not covered by lips even during smoking. Therefore, in order to lower the ventilation resistance of the low ventilation resistance filter section 30, the fibers constituting the filter need to be thick, preferably with a single fiber fineness of 7 denier or more, more preferably 15 denier or more. is desirable.

The apparent thickness of this fiber is more important than its actual thickness, and for this purpose, it is more preferable that the fiber be hollow. An electron micrograph (350x magnification) of an example of the hollow fiber is shown in FIG.

The high ventilation resistance filter section 2 has a ventilation resistance of 25 mgHtO or more in order to prevent the ventilation resistance of the tobacco section 1 from decreasing and the amount of diluted air from the openings 9 to change greatly as smoking progresses. It is desirable to As a filter used for this purpose, the filter shown in Japanese Patent Publication No. 57-6904 is wound with thin single fibers, which shortens the length of the filter (and has high airflow resistance). Obtained and most desirable.

Although the present invention has been mainly described with reference to a filter plug wrapped with high-porosity paper, similar performance can be obtained with a non-wrapped filter plug.

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

Example First, ordinary cigarette paper was used, the single fiber fineness was 7.5 denier, the cross-sectional shape of the fiber was Y-shaped, and the total fineness was 360.
00 denier acetate toe, circumference 24.7 x*,
Length 75m5! This plug was used as a tobacco substitute. Next, air permeability 1300wLl/min・cIrL2
- A similar plug was molded from 10 cInH20 high porosity wrapping paper and used as tobacco substitute 2. All of these closed type ventilation resistance values were 98 nmH,O.

Apart from this, a of Table 1, sample number 2.

b) A cigarette filter was made and denialized with a high porosity wrapping paper with an air permeability of 30,000 d/min"Cm""1' O (1 m H, O), and a perforated chip wrapping paper with an opening area of 611 n" was used. Then, it was connected to tobacco substitute 1 to obtain total dilution measurement sample A.Here, the wrapping paper of cigarette filter A had an air permeability of 30,0007 d/min'cm"
Using ultra-high porosity wrapping paper of 10 cmHzO, the opening point is:
It was installed at a distance of 12.5 ynx from the mouth end.

Furthermore, the single fiber fineness is 2.2 denier and the fiber cross-sectional shape is Y.
A cigarette filter with a circumference of 24.7 m and a length of 25 IliB, made of acetate tow with a total fineness of 40,000 denier, has an air permeability of 30,000 g/min/cIL.
This was rolled up with a high porosity wrapping paper of 10 cm H, O and connected to a tobacco substitute l using a perforated chip wrapping paper with an aperture area of 6 to 2 to form sample B for measuring the total dilution rate.The perforation point was: Same as before (provided at 12,511r from the mouth side edge.

Next, we used a cigarette filter shown in Japanese Patent Application Laid-Open No. 59-11170 with an air permeability of 30,000 d/min and cIL2.10.
A cigarette filter made of cIrLH20 high porosity wrapping paper with a circumference of 24.7 mm and a length of 25 mm was connected to tobacco substitute 1 in the same manner as the former, and was used as sample C for measuring the total dilution rate. Next, Tobacco Substitute 1 of Total Dilution Rate Measurement Sample B was replaced with Tobacco Substitute 2, and a non-perforated chip wrapping paper was used as the total dilution rate measurement sample.

The total air dilution ratio of these su/pulls was measured by varying the length of the tano (ko) substitute, and the results are shown in FIG.

From this, it can be seen that the filter of the present invention has the least change in air dilution rate when the cigarette paper has holes in the chip than when the cigarette paper is porous, and among the filters with holes in the chip.

Next, Samples 1 to 3 shown in Table 1 were created.

Here, the filters a and b, and the wrapping paper when dualizing these, have an air permeability of 30,000 d/min・cl.
It is rLt・10cIIL horse O high porosity wrapping paper, and the filter C used normal wrapping paper. Further, the opening point was set at 12.5 ttrm from the mouth end. Table 1 shows the reduction rate and smoke absorption relative to total TPM, total tar, and total nicotine that occur when no holes are opened, the ratio of nicotine to tar to 100 times, -N/T, and air dilution rate. Figure 4 shows the results when the aperture area of Samples 1 to 3 was changed.
Shows changes in airflow resistance.

From these results, it can be seen that the filter of the present invention enables cigarettes with low ventilation resistance, and also has a selection function that allows more nicotine to pass through than tar in the sample using hollow fibers.

Here, the ventilation resistance is the value of the pressure loss in water column when air passes through at 17.5 mJ/sec.The ventilation resistance of cigarettes is measured using an open type, and all others are measured using a closed type. It is shown as the value measured in .

In addition, the smoking test was conducted using a constant flow type automatic smoker at a flow rate of 17.
The experiment was carried out under the following conditions: 5 ml/sec, smoking time 2 seconds/time, smoking frequency 1 time/minute, smoking volume 35 m 17 times, and smoking length 5α/piece.

Further, the air dilution rate was expressed as a value obtained by dividing the amount of air flowing in from the tobacco portion or the tip opening by the total amount of suction air, and multiplying this by 100.

Table 1 [Effects of the invention] Table 1. As is clear from Figures 3 and 4, the dual-structure cigarette filter of the present invention has less ventilation resistance during smoking (and makes it possible to produce low-tar cigarettes with little difference in taste as the smoking progresses. do.

[Brief explanation of the drawing]

Figure 1 shows a side sectional view of the dual structure cigarette filter of the present invention connected to a cigarette, Figure 2 shows an electron micrograph of a cross section of the thick denier hollow acetate thread used in the present invention, and Figure 3 shows a cigarette. shows the change in total air dilution rate with change in length. FIG. 4 shows the effect of reducing ventilation resistance due to the apertures of the dual structure cigarette filter of the present invention and the Play 7 filter. Symbols in Figure 1: 1: Tobacco part, 2: High ventilation resistance filter part, 3: Low ventilation resistance filter part, 4: Cigarette wrapping paper, 5: High ventilation resistance filter wrapping paper, 6: Low ventilation resistance filter wrapping paper, 7:
High porosity wrapping paper when dualizing, 8: Chip wrapping paper, 9
: Opening part, 10: Tobacco smoke, 11: Diluted air - = 2)... Bu S Dimension 2 Button height mm + 3 figure Total air mud transfer rate change

Claims (1)

[Claims] 1. On the mouth side, the length is 12.5 mm or more and the ventilation resistance is 25 mm. , H, O or less (all paper-wrapped filter plugs or (b) non-wrapped filter plugs are arranged on the tobacco side, ventilation resistance is 25fi) 1.0 A dual-structure cigarette filter 2 in which the above filter plugs are arranged and dualized with high-porosity wrapping paper, and the single fiber fineness of the acetate fiber aggregate that makes up the filter plug arranged on the mouth side is 7 denier or more. A dual structure cigarette filter 3 according to claim 1, characterized in that the acetate fibers constituting the filter plug disposed on the mouth side have a single fiber fineness of 7 denier or more and are hollow. The dual structure cigarette filter according to claim 1, characterized in that: