TW201542108A - Low-tar menthol cigarette - Google Patents

Abstract

The present invention provides a low-tar menthol cigarette having a cigarette rod part and a filter part winded with a tipping paper, wherein the amount of the tar is 5 mg or less. The filter part comprises a single segment consisting of cellulose acetate tow, an airflow resistance of the filter part is 25 to 80 mm H2O/27 mm, and ventilation of air flowing from ventilation holes penetrating the tipping paper is 55% or more, and the filter part is added with menthol.

Description

Low tar menthol cigarette

The present invention relates to a filter cigarette having a low tar content and added with menthol.

In the filter cigarette, for the purpose of adjusting the components in the smoke during smoking, a method of providing a vent hole in the filter to adjust the air flow is known.

Meanwhile, in a general filter cigarette, it is known that the ventilation resistance of the filter can be adjusted in accordance with the amount of components in the smoke.

The filter cigarette disclosed in Patent Document 1 has a filter having a filter having a ventilation resistance of 50 mmH ₂ O/100 mm (corresponding to 13.5 mm H ₂ O/27 mm) and a ventilation ratio of 20 to 80%.

Meanwhile, Patent Document 2 describes a filter cigarette having two filter segments, and among the two filter segments, since the ventilation resistance of one filter segment can be adjusted to be larger than the other, the filter is supplied from the package. The air flow of the tipping paper (also known as the outer paper) is adjusted to a fixed range, so that it can exhibit a sufficient sense of sucking regardless of the concentration of nicotine and tar in the mainstream smoke.

On the other hand, the demand for menthol cigarettes in the Japanese market is increasing year by year. High, and invest in the high menthol cigarette market that has never been seen before. Patent Document 3 describes a method of adding a fragrance such as menthol to a filter by adding a menthol-dissolved fragrance in a plasticizer used in a filter process to an acetic acid tow (tow). .

Patent Document 4 describes a method in which menthol is stored on a carrier of a fragrance to prevent the amount of menthol from decreasing as time passes.

Meanwhile, Patent Document 5 describes a method of using a sheet having a fragrance-preserving property to prevent the amount of menthol from decreasing as time passes.

At the same time, Patent Document 6 describes a method for producing a filter for preventing the amount of menthol in the smoke from being adsorbed and adsorbed in advance in order to prevent the amount of menthol in the smoke from decreasing.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Unexamined Publication No. 62-86894

[Patent Document 2] Japanese Patent Laid-Open No. Hei 11-069965

[Patent Document 3] Japanese Patent Publication No. 43-28077

[Patent Document 4] Japanese Patent Laid-Open Publication No. 2012-29637

[Patent Document 5] International Publication No. 2011/118040

[Patent Document 6] International Publication No. 2012/004853

The invention described in the above Patent Document 1 has infiltrated the ventilation resistance of the filter and the opening portion of the air which is set on the tipping paper. The ratio is adjusted to a fixed range, but the purpose is not understood.

Meanwhile, the invention described in Patent Document 2 has an object of improving the ventilation resistance of a cigarette product while reducing the amount of nicotine or tar in the smoke component, thereby exhibiting a sufficient feeling of smoking.

The nature of the filter for cigarettes is generally a filter with low ventilation resistance in a filter cigarette with a low ventilation ratio and a high tar amount, and is used in a filter cigarette with a low tar amount having a high ventilation ratio. Filter with high ventilation resistance.

As mentioned above, although studies have been conducted focusing on the ventilation resistance or ventilation ratio (air inflow) of the filter, it has not been attempted to add a filter cigarette with menthol, especially a filter cigarette with a special low tar amount. Adjust the ventilation resistance or ventilation ratio.

On the other hand, the amount of menthol in the smoke of the filter cigarette having menthol during smoking can be adjusted according to the amount of menthol added to the cigarette, but simply increase the amount of aroma added to the cigarette. At this time, since the menthol which dissolves the cigarette coloring occurs on the roll paper covering the cigarette thread, it adheres to the roll paper, and the appearance is not good. At the same time, since the proportion of menthol in the cigarette is higher than that of the cigarette, generally, for a cigarette having a low tar tar content of 5 mg or less, the amount of menthol in the cigarette is generally lowered, and the solution is in addition to the cigarette. There is no other way to add as much as possible to the maximum amount that does not cause problems such as blooming.

In the method described in Patent Document 3, the menthol added to the filter portion is adsorbed to the tow of the filter during storage of the product, and there is a problem that the menthol in the smoke significantly decreases as time passes.

In the method described in Patent Document 4, when the carrier of the fragrance is used to increase the cost or the carrier is added to the inside of the filter, it is necessary to additionally provide a step of adding the carrier, and it is difficult to reproduce the manufacturing suitability.

The invention described in Patent Document 5 is also the same as the invention described in Patent Document 4, and there is a fear that the cost is increased or the compatibility with the cigarette is added to the tobacco yarn.

In the invention described in Patent Document 6, in order to increase the amount of menthol in the smoke, although the method of adding the amount of menthol to the filter has been described, it is necessary to add menthol to the plasticizer of the filter. A plasticizer that dissolves menthol. Since menthol is not easily dissolved in triacetin which is usually used as a plasticizer, it is necessary to mix a solvent such as polyethylene glycol to dissolve menthol to prepare a fragrance. At the same time, if a large amount of menthol is to be added, since a large amount of plasticizer and other solvents which can dissolve menthol must be present, there is a fear that the fragrance may be smudged or the hardness of the filter may be affected. Meanwhile, when it is intended to adsorb menthol to the inside of the filter, since the effect of merely adding menthol to the plasticizer is low and takes a long time, for example, menthol and a plasticizer are simultaneously added to the acetic acid. In the case of ester fibers, high temperature treatment must be carried out. However, these steps must be performed at the time of manufacture of the filter or immediately after manufacture, and it is difficult to say that it is a technique applicable to actual steps.

The ventilation resistance of the filter and the ventilation ratio of the filter cigarette are not related to the concentration of menthol in the smoke when smoking. Even in the menthol product, it is also sought to improve the smoking of low-tar cigarettes. A technique for the stability of the amount of menthol or the amount of menthol in the smoke after storage.

In the present invention, a low tar menthol cigarette is provided. It can increase the amount of menthol in the smoke when smoking, and at the same time can reduce the amount of menthol in the smoke after storage.

As a result of intensive investigation by the present inventors, it is understood that the low tar menthol cigarette can solve the above problems, and the present invention has the low tar content of the tobacco rod portion and the filter portion wrapped with the tipping paper of 5 mg or less. a tarp citric acid cigarette, wherein the filter portion comprises a single segment composed of cellulose acetate tow, and the filter portion has a ventilation resistance of 25 to 80 mm H ₂ O/27 mm, and air is self-piercing at the foregoing The ventilation ratio of the vent hole in the tipping paper is 55% or more, and menthol is added to the filter.

That is, the present invention is as follows.

[1] A low tar menthol cigarette, which is a low tar menthol cigarette having a tar portion of a tobacco rod portion and a filter portion wrapped with tipping paper of 5 mg or less, wherein the filter portion comprises cellulose acetate. a single segment formed by the tow, wherein the filter portion has a ventilation resistance of 25 to 80 mmH ₂ O/27 mm, and the air has a ventilation ratio of 55% or more from the vent hole penetrating the tipping paper, and the filter is Menthol is added to the part.

[2] The low tar menthol cigarette according to [1], wherein the amount of menthol added to the filter portion is 8 mg/piece or more per low tar menthol cigarette.

[3] The low tar menthol cigarette according to [1] or [2] wherein the tobacco rod portion or the filter portion has a resistance body.

[4] The low tar menthol cigarette according to [3], wherein the aforementioned resistance body is a capsule or an orifice.

[5] The low tar menthol cigarette according to any one of [1] to [4] wherein the filter portion has a ventilation resistance of 25 to 50 mmH ₂ O/27 mm, and the air inflow ratio is 70. %the above.

[6] The low tar menthol cigarette according to any one of [1] to [5] wherein the aforementioned low tar menthol cigarette has a circumference of 20.0 to 27.0 mm.

The low tar menthol cigarette of the present invention can increase the amount of menthol in the smoke when smoking, and at the same time, can reduce the amount of menthol in the smoke after storage.

Fig. 1 is a graph showing the relationship between the storage period of the filter-tipped cigarette and the reduction rate of the amount of menthol in the cigarette.

Fig. 2 is a graph showing the relationship between the amount of initial menthol added and the menthol release rate in the filter-tipped cigarette after storage.

In the following, the present invention is not limited to the following embodiments and examples, and the present invention is not limited to the scope of the invention.

The low tar menthol cigarette of the present invention is a filter cigarette having a tobacco stem portion and a filter portion wrapped with tipping paper, the filter portion comprising a single section composed of a single cellulose acetate tow. In the section, the ventilation resistance of the filter portion is 25 to 80 mmH ₂ O/27 mm, and the air is infused with a vent ratio of 55% or more from the vent hole penetrating the tipping paper, and menthol is added to the filter.

The tobacco rod can take a conventional form. The type of cut tobacco of the cigarette is not particularly limited, and a conventionally used person may be a tobacco rod wrapped in a roll paper. In the tobacco rod, in order to adjust the ventilation resistance of the low tar menthol cigarette (with a filter cigarette), a resistance body such as a capsule or an orifice may be disposed inside the rod.

The filter portion constituting the low tar menthol cigarette of the present invention is wrapped with tipping paper. The tipping paper which can be used in the present invention is not particularly limited, and those which are impermeable can be used.

In the tipping paper, the air inflow means formed by the plurality of openings (vent holes) through which the air is circulated in the circumferential direction of the packaged filter is provided, and the air can be adjusted from being immersed in the low tar menthol cigarette. The ventilation ratio of the vent hole in the aforementioned tipping paper. The form of the opening may be in the form of one or more rows along the circumferential direction of the filter.

The air permeability of the tipping paper formed with several openings is usually 100 to 7,000 CU. Here, CU means a flow rate (mL, (0.001 L)) of 1 cm ² (100 mm ² ) of tipping paper in 1 minute (60 seconds) when the differential pressure is 100 mmH ₂ O (980.665 Pa).

The low tar menthol cigarette of the present invention has an air inflow ratio of 55% or more. The ventilation ratio is preferably 61% or more, and more preferably 70% or more. When these ventilation ratios are obtained, the smoker can feel the scent of menthol more strongly. The ventilation resistance of the filter at this ventilation ratio is 80 mmH ₂ O/27 mm or less which will be described later.

The air inflow ratio in the present invention means the flow rate of air in the mouth end when sucking the filter cigarette (product) at a standard flow rate of 17.5 cm ³ /sec, in percentage (by means of air inflow means) The ratio of air flow in the interior of a cigarette with filter paper.

The ventilation ratio of the air inflow can be adjusted, for example, by changing the size, number, and number of the plurality of openings, or changing the material of the tipping paper to change the air permeability. For example, the position of the opening may be disposed at a position of 12 to 20 mm from the end of the suction port.

In the present invention, the ventilation resistance of the filter portion refers to a filter that covers the filter portion with a gas-impermeable rubber so as not to allow air to flow from the side surface of the filter portion, and is filtered at a flow rate of 17.5 cm ³ /sec from one end thereof. The pressure difference PD (mmH ₂ O) in the mouth.

The filter portion constituting the low tarp menthol cigarette of the present invention includes a single segment. In other words, the filter portion used in the filter cigarette of the present invention has a single segment composed of cellulose acetate tow. Meanwhile, in the segment composed of the cellulose acetate tow, there may be a resistance body such as a capsule or an orifice.

In the ventilation resistance of the filter portion of the low tarp menthol cigarette of the present invention, when a resistance body such as a capsule or an orifice is disposed on the filter portion, the value of the filter that does not include the resistance body is used as a reference.

The shape of the capsule or the orifice is not particularly limited and can be applied to a person skilled in the art.

The filter portion used in the present invention is a constituent material of a single segment composed of cellulose acetate tow, which is cellulose acetate. The cellulose acetate fiber constituting the cellulose acetate tow may, for example, be a single yarn having a fineness of about 1.0 to 8.0 denier and a total fineness of from 15,000 to 70,000 denier, and a fiber cross section is exemplified. The shape is circular, elliptical, Y-shaped, X Font type, I type. The inside of the filter may, for example, be a uniform filling with cellulose acetate tow.

The ventilation resistance of the filter portion used in the low tar menthol cigarette of the present invention is 25 to 80 mmH ₂ O/27 mm. Further, "27 mm" used in the unit of the ventilation resistance means the longitudinal length of the filter portion.

Since the ventilation resistance of the filter portion is 25 mmH ₂ O/27 mm or more, the smoke can be sufficiently filtered at the time of smoking. On the other hand, since the ventilation resistance of the filter portion is 80 mmH ₂ O/27 mm or less, excessive smoke filtration is not caused during smoking, and the filtration rate of menthol can be effectively reduced. At the same time, because of the low density of the filter, it is not easy to adsorb menthol during storage.

Since the ventilation resistance of the filter is within this range, and the ventilation ratio of the filter cigarette is set to a fixed range to be described later, the concentration of menthol in the smoke can be accommodated within a desired range. At the same time, when the ventilation resistance of the filter portion is 25 to 50 mmH ₂ O/27 mm, and the air inflow ratio is 70% or more, the effect is further improved.

For adjusting the ventilation resistance of the filter, it can be adjusted as previously known, for example, by appropriately selecting the total fineness (filling amount) of the cellulose acetate tow and the single yarn fineness, specifically, the cellulose acetate tow. Specifications, such as increasing the single yarn fineness and reducing the total fineness, can reduce the ventilation resistance.

The weight of the tow used in the filter is a value obtained by setting the length of the filter to 27 mm, and for example, 0.100 to 0.200 g, and the weight can be adjusted by adjusting the range to adjust the density of the filter.

In the low tar menthol cigarette of the present invention, when there is no resistance body, the ventilation resistance per one branch (the ventilation resistance of the one-pack filter cigarette) may be in the form of about 20 to 70 mmH ₂ O.

Here, the ventilation resistance of one filter cigarette is a pressure difference PD (mmH ₂ O) in a filter cigarette containing a ventilating effect when one end of the filter is sucked at a flow rate of 17.5 cm ³ /sec. ). In other words, the ventilation resistance of one of the filter cigarettes is the ventilation resistance measured by the state of the product connecting the rod portion and the filter portion.

The low tar menthol cigarette of the present invention has a tar amount of 5 mg or less. The amount of tar referred to in the present invention refers to the amount of tar inhaled by the smoker at the time of smoking.

If the amount of tar is to be 5 mg or less, that is, when the target tar amount is 5 mg or less, the composition of the tobacco contained in the tobacco rod may be changed, or the ventilation resistance of the filter portion or the ventilation ratio of the low tar menthol cigarette may be changed. And adjust.

The form of the tar amount of 5 mg or less can be appropriately adjusted, for example, in the range of 0.5 to 5 mg. In the low tar menthol cigarette of the present invention, even if it is such a low tar amount, the scent of menthol of the smoker can be provided.

The amount of tar with a filter cigarette is in accordance with ISO smoking conditions (ISO 4387), for example, 20 measurements are taken as one measurement. The measurement was performed using a gas chromatograph.

The low tar menthol cigarette of the present invention is added with menthol to the filter. The addition of menthol in the filter may be, for example, a form of addition of 10 to 100% by volume of the fiber bundle acetate tow constituting the filter. The method of addition can be exemplified before the cigarette with the filter is formed. The method of adding to the cellulose acetate tow of the filter may also be a method of adding after the filter cigarette is constructed.

The method of adding menthol is not particularly limited, and a known method can be used. Menthol can be either a synthetic or a natural product.

In the low tar menthol cigarette of the present invention, the amount of menthol added to the filter is preferably 8 mg / more. When the amount of menthol added is 8 mg/piece or more, the amount of menthol in the smoke after storage can be made more stable. The amount of menthol in the stored cigarette is more stable, which means that the amount of menthol released from the filter portion after smoking with the filter cigarette is kept close to a fixed range even after storage time. The amount of menthol added to the filter portion is preferably 10 mg/piece or more, and particularly preferably 12 mg/piece or more. On the other hand, the upper limit of the amount of menthol is 20 mg/min or less.

The axial (lengthwise) length of the filter which can be used in the low tarp menthol cigarette of the present invention can be, for example, 15 to 35 mm.

Meanwhile, the circumference of the low tarp menthol cigarette of the present invention may be in the form of 20.0 to 27.0 mm, and more preferably in the form of 24.0 to 26.0 mm. Within these ranges, it may be suitable to ensure a high menthol concentration in the smoke, and a menthol concentration after storage and storage.

The total length of the low tar menthol cigarette of the present invention is in the form of 80 to 100 mm.

<Method for producing low tar menthol cigarette>

The low tar menthol cigarette of the present invention can be used in addition to the use of menthol added to the filter and setting the ventilation resistance of the filter to a fixed range, and setting the ventilation ratio of the air inflow outside the fixed range. Method of manufacturing.

Even if a resistance body such as an orifice is incorporated into the tobacco rod, a conventional method can be used.

The tobacco rod portion constituting the low tarp menthol cigarette of the present invention may be in the form of a tobacco sheet including a tobacco rod and a roll paper wrapped therein, and the material or shape thereof may be a low tar oil which can be specified in the present invention. , the conventional person can be used without limitation.

The circumference of the tobacco rod portion may be the same as the circumference of the low tarp menthol cigarette of the present invention described above.

The axial length of the tobacco rod portion may be, for example, 50 to 75 mm.

[Examples]

The present invention will be more specifically described by the examples, but the present invention is not limited to the scope of the embodiments described below.

<Example 1>

Examples 1, 2 and Comparative Examples 1, 2

By designing a cigarette having a low ventilation resistance of a filter and a high ventilation ratio of air inflow, it is verified that the amount of menthol in the smoke can be increased, and a cigarette having a filter ventilation resistance and a ventilation ratio shown in Table 1 is produced. Determination of the amount of menthol and the amount of tar in the smoke of each cigarette. At this time, the produced filter was stored and stored under the conditions of 3 weeks, a temperature of 22 ° C, and a humidity of 60%, and the menthol was sufficiently adsorbed to the cellulose acetate tow and stabilized, and used for the cigarette. The cigarettes produced at the same time are usually stored and stored at a temperature of 22 ° C and a humidity of 60% within 3 weeks after packaging of the aluminum foil, and the amount of menthol in the smoke is carried out. Determination of the amount of tar. Also, the tow specification in the table indicates the single yarn fineness. Section shape. The total fineness, for example, 5.9Y35000, refers to a cellulose acetate tow having a single yarn fineness of 5.9 denier, a cross-sectional shape of Y type, and a total fineness of 35,000 denier.

The cigarette used in the test was a full length of 84 mm and a filter length of 27 mm. The shredded tobacco was mixed with American type, the filling amount of shredded tobacco was set to 0.580 g, and 12,000 ppm of menthol was added to the shredded tobacco weight. At the same time, the amount of tar at the outlet of the filter was set to 5 mg, and the ventilation resistance and the ventilation ratio of each cigarette filter were set.

The smoking of cigarettes was carried out in accordance with ISO smoking conditions, and the measurement of menthol was carried out by repeating the measurement of 20 counts as one count of the first measurement, and the tar measurement was performed by measuring 20 counts as the count of one measurement. The amount of menthol and the amount of tar in the smoke were measured by GC-FID7693 (menthol measurement, nicotine measurement) manufactured by Agilent, and GC-TCD-7890A (moisture measurement) manufactured by Agilent Co., Ltd., and the amount of menthol per cigarette was carried out. And the determination of the amount of tar. The ventilation ratio is based on SODIMAX made by SODIM. The inflow rate of air flowing in from the opening portion of the tipping paper was measured.

At the same time, a sensory evaluation of the menthol sensation of the four cigarettes shown in Table 1 was prepared. In the evaluation method, Comparative Example 1 in which the most common conditions were combined among the four kinds of cigarettes was used as a control, and the other three menthols were perceived to be high or the same or lower. In this assessment, 10 people were used as the target number, and by accumulating the binomial distribution probability (one side), the significant difference was combined and confirmed at the 5% significance level.

Table 2 below shows the difference between the amount of menthol and the amount of tar in addition to the amount of menthol in the smoke (hereinafter, abbreviated as M/T ratio), and different mints when the same amount of tar is obtained. The amount of alcohol is an indicator. Usually, since the amount of menthol in the smoke is increased in proportion to the amount of tar, the amount of mentol normalized is used to compare the amount of menthol. At the same time, the combined sensory evaluation results are recorded as the presence or absence of significant differences.

It can be seen from Table 2 that the cigarette designed to have a low ventilation resistance of the filter and a high ventilation ratio of air inflow can make the amount of menthol in the smoke and The M/T ratio becomes high. This is considered to be due to the difference in the filtration rate between tar and menthol in the relationship between the ventilation resistance of the filter and the ventilation ratio. Specifically, when a filter having a low-ventilation resistance is used, in addition to the filtration phenomenon of the physical smoke inside the filter, the amount of menthol which can be condensed/adsorbed in the tow fiber of the filter, due to the total amount of the tow The amount is reduced and the amount of menthol and the M/T ratio in the smoke are increased. Further, when the ventilation ratio is designed to increase the time during which the smoke passes through the inside of the filter, although the filtration rate of tar and menthol is generally high, it is difficult to make the filter having low ventilation resistance with a small total amount of tow. The filtration rate of menthol becomes higher, and the M/T ratio is increased. As a result, it is possible to reduce the filtration rate of menthol as compared with the tar filtration rate. Even in the sensory evaluation, a difference in the feeling of menthol was obtained, and in Comparative Example 1, it was confirmed that Examples 1 and 2 had a significantly high menthol feeling.

It is considered to be more preferable than the range of the present embodiment and the comparative example, and it is assumed that the ventilation resistance of the filter is 80 mmH ₂ O/27 mm or less, and the ventilation ratio is 55% or more, and more preferably 61% or more, and more preferably The range is assumed to be 50 mm H ₂ O/27 mm or less and the ventilation ratio is 70% or more. When considering the actual process of the filter, the realistically achievable ventilation resistance range is 25mmH ₂ O/27mm or more. The material of the filter, characterized by a cellulose acetate tow

From the above, it was confirmed that the amount of menthol in the smoke can be increased due to the cigarette having a high ventilation ratio designed to flow into the air. In the present embodiment, although the filter length is 27 mm, it is not limited to this embodiment, and even if it is any length, the same effect is expected. Meanwhile, for the circumference of the cigarette, in the present embodiment, although the condition of 24.8 mm is used, However, it is also expected to have the same effect as in the circumferential area of the present embodiment, specifically in the range of 20.0 mm to 27.0 mm, and more preferably in the range of 24.0 mm to 26.0 mm.

<Reference Examples 1 to 4>

When a filter having a low ventilation resistance is used and a filter containing menthol is stored, the purpose of verifying the amount of menthol in the smoke is to change the storage period of the filter and the storage period in the form of a cigarette package. The ventilating resistance of the filter and the fragrant amount of the filter shown in Table 3 were tested for the amount of menthol in the smoke as the filter and the storage period of the cigarette were changed. Since the influence of other factors is eliminated at this time, no vent hole is provided in the filter portion, and only the ventilation resistance of the filter is changed to perform the test.

The test was carried out in the same manner as in the previous Examples 1 and 2 and Comparative Examples 1 and 2 except for the storage conditions, the ventilation resistance, and the ventilation ratio of the filter.

Table 4 shows the conditions of the filter and the storage period in the form of a cigarette package. The storage conditions in the shortest period can be exemplified in just making the filter. After the mouth is used directly for the manufacture of cigarettes, and the storage is not carried out in the form of packaging of cigarettes (Condition A). On the other hand, in the storage conditions for the longest period of time, storage can be carried out for 2 months after the filter is manufactured. After the cigarette was produced using the filter, it was stored in a package form for 2 months (condition G). For each of the cigarettes subjected to the conditions A to G, the amount of menthol in the smoke and the amount of tar were measured.

The test results are shown in Table 5 and Figure 1. The reduction rate shown in Table 5 indicates the value of the decrease rate of the M/T ratio in each condition when the condition A and the M/T ratio were stored without performing filter storage and storage in a cigarette package. Fig. 1 is a graph showing the rate of decrease of M/T in each condition.

As can be seen from Table 5 and Fig. 1, the longer the storage period of the filter and the storage period of the packaged form of the cigarette, the smaller the value of the obtained amount of menthol can be obtained. At the same time, it can be confirmed that the larger the ventilation resistance of the filter and the decrease rate of the M/T ratio, the reference example 1 of the reference examples 2 to 4 which satisfy the requirements of the filter ventilation resistance of the first application of the scope of the patent application. Comparison At the time, the M/T ratio has a large reduction rate. It is considered that this is because the weight of the tow in the filter having low ventilation resistance is low, and the adsorption of the menthol to the filter is reduced as compared with the case of the high ventilation resistance, that is, the release efficiency per unit of menthol is high.

From the above results, it was confirmed that the amount of menthol in the smoke was easily maintained stably by using a filter having a low ventilation resistance of the filter. This effect can be obtained in the same manner even when combined with the condition of the high ventilation ratio of the filter for low ventilation resistance, so that the amount of menthol in the smoke can be made high and the menthol can be easily stabilized after storage. Maintain the cigarettes.

<Reference Examples 5 to 8>

When the amount of menthol in the filter is 8 mg or more per part, the purpose of verifying the amount of menthol in the smoke can be more stable, and the filter ventilation resistance is fixed, and the amount of menthol in the filter is changed. And testing of the filter during storage. The amount of menthol fragrant in the filter is shown in Table 6. Since this is the same as the reference examples 1 to 4 except for the influence of other influencing factors, the vent hole is not provided in the filter portion, and only the ventilation resistance of the filter is changed to test.

The storage environment of the filter was carried out at the same temperature of 22 ° C and humidity of 60% with reference examples 1 to 4. The storage period of the filter was never stored (marked as 0 W), 2 weeks (marked as 2 W), The conditions of storage for 5 weeks (labeled as 5W) and the longest 2 months (labeled as 2M) were tested, and the release rate of menthol from the filter as a release rate of menthol in the smoke was compared as a percentage. In this case, although the storage in the form of a cigarette package is not carried out, the storage period is only changed by changing the storage period of the filter, and the investigation is only affected by the storage of the filter. However, since the storage is in the form of a cigarette package, the release ratio can be estimated. The previous reference examples 1 to 4 were further reduced. Therefore, in the test here, menthol was not added to the tobacco of the tobacco rod portion, and only the release of menthol from the filter portion was observed. The test was carried out in the same manner as in the previous Examples 1 and 2 and Comparative Examples 1 and 2 except for the menthol flavor amount of the cut tobacco/filter, the aeration ratio, and the storage period of the filter. The test results are shown in Tables 7 and 2.

As can be seen from Tables 7 and 2, the more the menthol aroma of the filter, the more stable the release rate with time, and compared with Reference Examples 5 and 6, it can be said that the time-dependent change resistance of Reference Examples 7 and 8 is relatively better. Strong. This is because the amount of menthol added in a large amount is equal to or greater than the amount of menthol adsorbed by the tow, and the influence by the adsorption of menthol can be made small. This effect, due to the use of Reference Example 5 8 When the filter with lower ventilation resistance can reduce the amount of menthol adsorbed to the tow, it is estimated that it can exert its effect. From the above results, the amount of menthol scent in the filter was such that when the content per liter was 8 mg or more, it was confirmed that the amount of menthol in the smoke was stable. It is estimated that the menthol fragrant amount in the more desirable filter is 10 mg or more, and more desirably, it is 12 mg or more in accordance with the conditions of Reference Example 8.

<Example 3 and Comparative Examples 3 and 4>

In Examples 1, 2 and Comparative Examples 1 and 2, a comparative test when the amount of tar was 5 mg, even if the technique is aimed at 1 mg of a lower tar amount, in order to verify that it is effective, it is shown in Table 8. The test tests shown below were carried out in the same tests as in Examples 1 and 2 and Comparative Examples 1 and 2. At the same time, peers also conducted an assessment of the combined sensory assessment.

Table 9 shows the test results, which indicate the M/T ratio in addition to the amount of menthol and tar in the smoke.

As is clear from Table 9, Example 3 was the highest amount of menthol, and the highest result was obtained even when the M/T ratio was compared. For the feeling of menthol evaluated by sensory evaluation, a significantly high menthol sensation was obtained in Example 3, which was the same as the evaluation of Examples 1, 2 and Comparative Examples 1, 2 previously performed, due to the amount of menthol. The values are quite different, so it can be estimated that there is a significant difference. From the above, it was confirmed that the present technology is effective even in the range where the amount of tar is extremely low.

Claims (6)

A low tar menthol cigarette comprising a tobacco rod portion and a filter portion wrapped by tipping paper having a tar content of 5 mg or less, wherein the filter portion comprises a cellulose acetate tow. In a single section, the ventilation resistance of the filter portion is 25 to 80 mmH ₂ O/27 mm, and the air is ventilated from the vent hole of the tipping paper to a ventilation ratio of 55% or more, and the filter portion is added Menthol. The low tar menthol cigarette according to claim 1, wherein the amount of menthol added to the filter portion is 8 mg/piece or more per low tar menthol cigarette. The low tar menthol cigarette according to claim 1 or 2, wherein the tobacco rod portion or the filter portion has a resistance body. The low tar menthol cigarette according to claim 3, wherein the resistance body is a capsule or an orifice. The low tar menthol cigarette according to any one of claims 1 to 4, wherein the filter portion has a ventilation resistance of 25 to 50 mmH ₂ O/27 mm, and the air inflow ratio is 70% or more. . The low tar menthol cigarette according to any one of claims 1 to 5, wherein the aforementioned low tar menthol cigarette has a circumference of 20.0 to 27.0 mm.