JPH03160979A - Filter for tobacco smoke - Google Patents

Abstract

PURPOSE:To improve selective absorbing ability of nicotine or tar in tobacco by adding urea to a filter for tobacco. CONSTITUTION:1-30wt.% urea is added to filter for tobacco smoke of cellulose acetate filter, layon filter, etc.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a tobacco smoke filter,
More specifically, the present invention relates to a filter for tobacco smoke characterized by containing urea as a selective remover of nicotine fraction in tobacco smoke.

[Conventional technology]

Recent trends in cigarette consumption indicate a preference for products with a light taste, low amounts of nicotine and tar, and a mild feel. In order to meet such consumer demands, various improvements have been made to cellulose acetate filters and paper filters that are currently widely used.

A simple example is one that attempts to increase the filtration rate of nicotine tar by making the length of the filter longer than conventional products. In addition, in the case of cellulose acetate filters,
By making the fibers finer in denier and developing various cross-section yarns,
Measures have been taken to increase the filtration rate of nicotine tar.

[Problem to be solved by the invention]

As the debate on smoking and health issues increases, the aforementioned trend toward milder smoking is expected to continue, but the problem is that uniformly filtering nicotine tar as in the past does not satisfy the taste and sense of smoke volume. There is. In order to achieve a satisfactory smoking taste and smoke volume feeling, it is necessary to control the ratio of the amount of nicotine to the amount of tar in the smoke (hereinafter referred to as N/T) to a desired value. N/T in smoke can be adjusted by changing the composition of tobacco leaves or using tobacco substitutes. However, these methods have problems. That is,
There are constraints on the cost of a new leaf group, the availability of leaf labor, etc. Furthermore, to date, there are no tobacco substitutes that are acceptable in terms of taste and are not yet at the stage of practical use.

In order to overcome these problems, research is being conducted on filter additives that change the N/T in smoke, that is, filter additives that selectively adsorb and remove nicotine or tar in smoke. There is still nothing that has been put into practical use.

[Means to solve the problem]

In view of the above circumstances, the inventors of the present invention have conducted extensive studies and studies to find a substance that selectively adsorbs nicotine or tar in smoke, and have found that urea selectively adsorbs nicotine in tobacco smoke. They discovered that the adsorption ability was extremely high, and completed a tobacco smoke filter that had the ability to selectively adsorb urea-added nicotine.

That is, the present invention provides a tobacco smoke filter characterized by containing urea.

The urea used in the present invention is an industrial chemical JIS K14588.
3. Reagents may be used as long as they satisfy any of JIS K8731-85, Japanese Pharmacopoeia, and Cosmetic Raw Materials Standards.

Since cigarettes are a luxury item, it is essential that additives for filters be substances that do not impair the original aroma and taste of cigarettes, but as long as they meet any of the standards listed above, Since urea is odorless, even if it is included in a cigarette smoke filter, it will not have any adverse effect on the aroma and taste of cigarettes.

Urea can be added to tobacco smoke filters in powder form, or by impregnating or spraying filter tow or filter paper with an aqueous urea solution or a solution of urea dissolved in an organic solvent such as methanol or ethanol. May be added.

It is generally preferable to manufacture the filter structure in the form of a dual structure or triple structure in order to prevent urea from flowing into the oral cavity during smoking. When used in a dual structure, a part of the filter is sprinkled with urea powder or added with an aqueous urea solution or an organic solvent solution of urea by impregnation or spraying, and a part that does not contain urea is connected.

When used in a triple structure, a part of the filter contains urea, either by directly inserting urea powder between the filters, by sprinkling urea powder on the filter, or by spraying an aqueous urea solution or an organic solvent solution of urea. It is used in a structure where it is sandwiched between the parts that are not used.

Examples of filter materials to which urea is added include cellulose acetate filters, rayon filters, polypropylene filters, paper filters, etc., and it is effective no matter which material is used.

The amount of urea added varies depending on the tobacco leaf structure and filter material, but it is 1 to 3 liters per tobacco smoke filter.
0% by weight (ratio of urea weight to filter material weight) is preferred.

If the amount of urea added is less than 1% by weight, the nicotine removal effect is too small; on the other hand, if it exceeds 30% by weight, urea is slightly hygroscopic, so water in tobacco smoke is also removed to a large extent. , problems arise in terms of aroma and flavor as the spiciness becomes stronger.

〔Example〕

EXAMPLES Hereinafter, the present invention will be explained in detail with reference to Examples, but the present invention is not limited to these Examples in any way.

In addition, the ventilation resistance measurement and the smoking test (measurement of nicotine and tar filtration rate) described in the following Examples and Comparative Examples were performed as follows.

A: Airflow resistance is measured when the flow rate of air passing through the filter plug, lug, or filter chip to be measured is 17.5ml.
The pressure loss at 1/sec is shown at the water faucet.

B: The smoking test was conducted using a constant flow type automatic smoking machine at a flow rate of 17.
Automatic smoking was performed under the conditions of 5 ml/sec, smoking time 2 seconds, smoking cycle 60 seconds, and smoking length 50 mm, and the mainstream smoke was collected with a Cambridge filter, and the filtration rates of nicotine and tar were measured.

Nicotine and tar filtration rate is the amount of nicotine and tar attached to the filter after smoking is finished (each T
N and 1”7〉 and the amount of nicotine and tar attached to the Cambridge filter for collecting smoker smoke (respectively Cs
and Ct) were measured, and the filtration rate of each filter body was determined using the formula below.

Nicotine filtration rate (wt%) Tar filtration rate (wt%) The filter chip is made of crimped cellulose diacetate tow with a single fiber fineness of 3.3 denier, a Y-shaped cross section, and a total fineness of 46,000 denier, and 6 wt% triacetin. A cigarette filter rod with a circumference of 24.4 mv+, a length of 84 holes, and an airflow resistance of 300+n+nHJ is rolled up and cut into 17mm filter tips to make commercially available cigarettes called "Cherry" (Japan Tobacco Inc.). A portion of the filter was cut out from a tobacco rod made by A. Co., Ltd.) and connected to a tobacco rod to form a sample of Comparative Example 1.

The same filter chip used for the comparison product sample above was cut into lengths of 12 mm and 51 nm, and a urea aqueous solution with a concentration of 10% by weight was added to the 12 mm filter chip so that the amount of urea added to the filter chip was within the chip. For weight,
Add it with a syringe to make it 10% by weight, then let it cool at room temperature (
The sample was vacuum dried at 20 to 25° C.) and connected to a 5 mm filter chip. Next, this filter chip was connected to a "Cherry" tobacco rod in the same manner as in Comparative Example 1 to obtain a sample of Example 1.

These samples were smoked using an automatic smoking machine and the filtration rates of nicotine, tar, and water were measured. Table 1 summarizes the results.

Table 1 In exactly the same manner as in Example 1, only the amount of urea aqueous solution added was changed, and filter chips were prepared so that the amount of urea added to the filter chip was 5 and 30% by weight based on the tow weight in the chip. , and were connected to the tobacco rod portion to provide samples of Examples 2 and 3.

After smoking with an automatic smoking machine in the same manner as in Example 1, the filtration rates of nicotine, tar, and water were measured. The results of Part 9 are summarized in Table 2.

Table 2 The same 84 mm length filter rod used in Example 1 was cut into 5 mm filter tips. Part 2
The urea particles are arranged with 5 gaps and separated using a standard sieve that has passed JIS certification, with a particle size of 24-42 mesh. 03g (30% by weight based on the weight of the filter material) was added to make a triple filter, which was connected to the tobacco rod of "Cherry" in the same manner as in Example 1.

10 As a comparative example, the 84 mm long filter rod used in Examples 1 to 4 was cut into 17 mm filter chips, and the tobacco rod was connected to the same filter tip as the triple filter of Example 4. A sample prepared using the same method was used. These samples were subjected to a smoking test in the same manner as in Example 1, and the filtration rates of nicotine, tar, and water were measured. The results are shown in Table 3.

Table 3 [Effects of the Invention] According to the urea-containing tobacco smoke filter of the present invention, nicotine in cigarette smoke can be selectively adsorbed and removed.

Claims (1)

[Claims] 1. A tobacco smoke filter characterized by adding urea. 2. The tobacco smoke filter according to claim 1, wherein the amount of urea added is 1 to 30% by weight per filter.