JPS60248161A - 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] [Technical Field] The present invention relates to a dual structure cigarette filter in which a filter element made of an air-impermeable material and a filter element B made of a fiber material are joined together, More specifically, the filter element A has a tobacco smoke ventilation passage extending longitudinally through the interior S, and the ventilation passage and the outside are ventilated by an air ventilation passage separate from the ventilation passage W.
The present invention relates to a ventilation filter having a structure.

[Background technology]

In recent years, due to changes in preferences for smoking, it has become necessary to develop cigarettes with a lighter smoking sensation, and research and development of various cigarette filters has been progressing to achieve this purpose. High r-transmissive cigarette filters that have been developed so far include those that have increased the amount of f# filled in the cigarette filter, and those that have made the fibers filled in the cigarette filter finer or have an irregular 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. cigarette filters have almost no effect and inevitably have the drawback of high suction resistance. Development of cigarette filters with fewer such drawbacks is underway. There are products that introduce air from the outside to reduce the amount of tobacco smoke inhaled, and also dilute the tobacco smoke with air.

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. However, when this perforated filter is opened and observed after smoking, it can be seen that on the mouth side from the perforated point, tobacco smoke passes through the center and diluted air passes through the peripheral part. 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 it placed on the recessed side of the mouthpiece, but in the former, the opening is covered with the lips when smoking, and in the latter, the opening is covered by the lips. There is a problem with the shape stability when held in the hand, and because both tobacco smoke and diluted air are separated and enter the smoker's daytime at almost the same flow rate, it is difficult to obtain a sufficient sense of flavor. (There were a lot of things.)

The present inventor previously applied for a patent application in 1987-761 for a dual-structure cigarette filter, which has a good mixing effect of tobacco smoke and diluted air and provides an excellent aroma and taste sensation.
Although it was proposed in No. 99, subsequent studies revealed that the interior has a space for cigarette smoke ventilation that penetrates in the length direction, and the space and the outside can be ventilated through an air ventilation path that is separate from the cigarette smoke ventilation path. The dual-structure cigarette filter is made by joining a filter element B made of an air-impermeable material with a filter element B made of a plug-shaped fiber material. The present invention was completed by discovering that it is possible to produce a cigarette with a large reduction effect.

[Purpose of the invention]

The present invention provides a ventilation filter having excellent drinking characteristics.

[Structure of the invention]

The gist of the present invention is to have a cigarette smoke ventilation path 9 formed of a space penetrating the inside in the longitudinal direction, and to connect the ventilation path and the outside with an air ventilation path 10 that is separate from the ventilation path. This dual-structure cigarette filter has a filter element 4 made of a possible air-impermeable material and a filter element formed of a fiber material 7 shaped into a plug shape.

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 section 1, the tobacco smoke S enters a tobacco smoke vent passage 9 which runs longitudinally through the filter element A, which is made of an air-impermeable material. - The diluted air a enters through the opening 8, passes through the air ventilation path 10, and reaches the tobacco smoke ventilation path 9, where it uniformly mixes and dilutes the tobacco smoke and filters the fiber material into a plug shape. After passing through the fiber material part 7 of element B and passing through 1 part f, it reaches the smoker's daytime. The air ventilation path 10 acts as an inflow ventilation path for dilution air a.

FIG. 2 shows a filter element A made of air-impermeable material.
A side cross-sectional view of the device is shown in which the device is placed near the smoker's mouth. In this case, the filter element B, which is made of a fiber material formed into a plug shape, helps to reduce the fluctuation in the ratio between the tobacco smoke flow rate and the dilution air flow rate that accompanies the combustion of tobacco smoke, and further reduces the amount of tobacco smoke. The tobacco smoke ventilation path 9 and the air ventilation path 10 are effective in reducing the suction ventilation resistance of the cigarette.

FIGS. 3 and 4 show an example of the XX cross section shown in FIG. 2, and in FIG. 4, the air ventilation passage IO is eccentric with respect to the tobacco smoke ventilation passage. This eccentricity, particularly in the combination of FIG. 1, results in less diffusion of the gas vapor phase component and, in turn, a reduction in the amount of tarpanicotine nanoparticulate phase component passing through.

In the tobacco smoke ventilation path, the cross-sectional area perpendicular to the filter of the space where tobacco smoke and diluted air mix is 30% or less of the cross-sectional area perpendicular to the filter, and it is better to have a cross-sectional area of 1.6 inches or more.
It is suitable for uniform mixing and dilution, and seems to improve the taste.

If this cross-sectional area exceeds 30%, the mixing effect of tobacco smoke and diluted air may be insufficient, and the smoking taste characteristics will be compounded and will not improve. High ventilation resistance (making it difficult to breathe).

FIG. 5 shows a filter element A made of air impermeable material.
is placed near the smoker's mouth, and the tobacco smoke ventilation path is
It is shown that it expands toward the mouth of the smoker, and by doing so, the smoking taste is further improved.

Further, in FIG. 6, a groove portion 11 is provided on the outer periphery of the air ventilation path 10, and by curving it, it becomes possible to take in a larger amount of dilution air from the outside.

As the filter element made of an air-impermeable material used in carrying out the present invention, in addition to plastics such as polyethylene, polypropylene, and polystyrene, air-impermeable materials such as metal and wood can be used. However, from the viewpoints of light weight, cost, and air permeability during the process of cutting, extrusion molded products made of closed cell foam materials such as polypropylene and polystyrene are the most desirable.For filter elements made of fiber materials molded into a plug shape, acetate, polypropylene,
Long-rutted tow such as rayon, pulverized pulp, linter, crepe-processed paper, etc. in a rod shape can be used.

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

Example First, as a comparative example, an acetate crimped tow having a single fiber fineness of 4 denier, a fiber cross-sectional shape of a Y-shaped cross section, and a total fineness of 43,000 denier was prepared in the usual manner using ordinary plug wrapping paper, with a diameter of 7. .86 Dragon's regular cigarette filter was rolled up and cut into a length of 201 m, and this was connected to a commercially available cigarette ")~Illite" with the filter section removed using non-porous wrapping paper to create N1. It was used as a sample.

Next, an acetate crimp tow similar to l'lhl was wound in the usual manner onto a cigarette filter with a diameter of 7.86 am using plug wrapping paper with an air permeability of 101/min-cvt'-10 cm. N
There were 112 samples.

Next, a dual-structure cigarette filter of the present invention shown in FIG. 1 was connected to a cigarette similar to N[11 with a perforated wrapping paper with three rows of perforations as a sample in No. 3. Here, the filter element made of an air-impermeable material is an extrusion molded product of expanded polystyrene with an outer diameter of 7.7 mm and a length of 7 mm, with a diameter penetrating through the center in the length direction. d
A cigarette smoke ventilation path consisting of a space of 2 and 2ynx is used, and four air ventilation paths with a diameter d1 of 1 ml are provided in the middle in the length direction, equally divided around the circumference, and the fiber material is shaped like a plug. As the filter element, we used a cigarette filter similar to Slow 1, but with a diameter 0.13 mm smaller, and we used a dual-structure cigarette filter with a plug wrapping paper with an air permeability of 301/min/min2:rOcmHzO. Filter and t.

Next, the air vent is 0.5
lI except that mu is eccentric! Make a sample equivalent to 13,
This was used as the Arashi 4 sample.

Furthermore, two air ventilation passages are provided at equal intervals around the circumference, and the outer periphery has grooves as shown in Figure 6 with a depth of 1ml+! A sample equivalent to %3 was prepared except that a sample of 5% was formed.

Next, the dual-structure cigarette filter of the present invention shown in FIG. 2 was connected to a cigarette similar to N[11 with a perforated wrapping paper with three rows of holes. There were 16 samples. Here, the filter element made of an air-impermeable material is an extruded polystyrene foam product with an outer diameter of 7.7 mm and a length of 15 mm, with a diameter d passing through the center in the longitudinal direction.
It has a tobacco smoke ventilation path consisting of a space of 2 to 3 mm, and four air ventilation paths with a diameter of d and 1 mm are provided equally around the circumference at a position 11.5 mm from the end of the smoker's mouth. As a filter element made of fiber material formed into a plug shape, l
``!I used a cigarette filter similar to 11 with a diameter 0.13 mm smaller and a length of did.

Next, a sample similar to the rod 6 was made, except that two air ventilation passages were provided at equal intervals on the circumference and a groove similar to that of the rod 5 was formed on the outer periphery (specimen 7).

Next, the sample of Arashi 7 was processed to create a sample of N8 having a shape as shown in FIG.

Pour these 8 types of samples in a constant flow type automatic smoking machine for t1.
7.5 meters, 17 seconds, smoking time: 2 seconds, interval between smokes: 58 seconds, cigarette combustion length: 50 seconds Automatic smoking was performed under the following conditions, and what was captured by the Cambridge filter was analyzed to estimate the amount of TPM, tar, and nicotine that passed through. Ta. In addition, eight types of samples were automatically smoked in a constant volume automatic smoking machine under the following conditions: 35 m 172 seconds, a smoking interval of 58 seconds, and a cigarette combustion length of 50 mm, and the amount that passed through the Cambridge filter was analyzed. The amount of carbon was quantified. In addition, the suction ventilation resistance shows the total pressure loss in water column when the suction air flow rate is 17,5me,' seconds, and the ventilation rate is 1t under a differential pressure of 10fiH9o.
The air dilution rate is expressed as the amount of air passing through per minute per x", and the air dilution rate is the ratio of the amount of air flowing from the outside into the tobacco smoke ventilation passage that directly penetrates the inside of the filter element made of air-impermeable material to the main suction air flow rate. Proportion of Filtrona VOM
! Shown as a value measured with a pen narration tester.

Also, the reduced aperture area of the 3-row perforated wrapping paper is 3.6 mytt2
It is.

Effects of the Invention It can be seen that the dual structure filter of the present invention has an excellent CO reduction effect, and provides an easy-to-smoke cigarette with low resistance to smoking and suction ventilation.

Table 1

[Brief explanation of drawings]

1, 2, 5, and 6 are open views of the dual structure cigarette filter of the present invention, and FIGS. 3 and 4 are examples of XX cross-sectional views of FIG. 2. shows. S: Tobacco smoke, a: Dilution air, d: Diameter of air ventilation path, d2: Diameter of tobacco smoke ventilation path, e: Eccentric distance between air ventilation path and tobacco smoke ventilation path, l: Tobacco cut portion, 2 : Tobacco wrapping paper, 3: Perforated wrapping paper, 4: Filter element made of air-impermeable material, 5: Breathable plug wrapping paper, 6: Plug wrapping paper, 7: Textile material, 8: Openings, 9: Tobacco smoke ventilation road,
10: Air ventilation path, 11: Groove. Daiya l Diagram + 3 diagrams 4 circles of life

Claims (1)

[Claims] 1. It has a cigarette smoke ventilation path 9 formed of a space penetrating the inside in the length direction, and the ventilation path and the outside can be ventilated through an air ventilation path 10 that is separate from the ventilation path. A dual structure cigarette filter in which a filter element 4 made of an air-impermeable material and a filter element formed of a fiber material 7 into a plug shape are joined. 2. Claim 1, in which the filter element made of an air-impermeable material is arranged so as to be located near the smoker's mouth.
Dual structure cigarette filter as described in section. 3. The cross-sectional area perpendicular to the length direction of the space penetrating in the length direction provided in the filter element made of an air-impermeable material is in the length direction of the filter element made of tobacco or fiber material molded into a plug shape. 1.6% or more of the vertical iα cross-sectional area30
% or less (1) A dual structure cigarette filter. 4. A space penetrating the filter element made of an air-impermeable material in the length direction is such that the cross-sectional area perpendicular to the length direction on the side of the filter element formed from the fiber material into a plug shape is Or, the cross-sectional area perpendicular to the longitudinal direction of a filter element formed from a fiber material into a plug shape is 1.6 or more and 30% or less, and expands toward the end of the smoker's mouth. The dual structure cigarette filter according to claim 2, characterized by: 5. Claim 1, characterized in that the center of the space extending in the length direction provided in the filter element made of an air-impermeable material and the center of the air ventilation passage are provided eccentrically. , the dual structure cigarette filter according to item 2, item 3, or item 4.