UA90299C2 - Cigarette paper with low fire spreading - Google Patents

Abstract

A cigarette paper of low fire-spreading property, comprising a base wrapping paper of 16 to 22g/mbasic weight containing a filler in an amount of 2 to 6g/mand, discretely disposed on one major surface thereof, combustion retardation regions coated with a combustion retardant, wherein the total coating amount of combustion retardant per m of coated zone area is in the range of 0.2 to 1.8g.

Description

The present invention relates to cigarette paper with low flame spread and, in particular, to cigarette paper having both the property of low flame spread and a low C/T (carbon monoxide/resin) ratio.

For example, in the Japanese patent application rp. Paradise Arrip. KOKAI Rybiysayop Mo. 7-300795| a cigarette paper provided with strips of flame retardant material applied to the base cigarette paper in order to make it difficult for the flame to spread when ignited, e.g. the floor, when the cigarette falls to the floor, e.g. by carelessness of the smoker, is proposed. This method is based on the fact that when high-flammability areas and low-flammability areas are formed on the cigarette paper, then normal smoking occurs in the high-flammability area, and when the charcoal comes into contact with the cigarette in the low-flammability areas, the cigarette will go out without taking a puff.

However, in cigarettes with traditional cigarette paper with low flame spread, the above-mentioned ratio of carbon monoxide/resin (C/1) in the cigarette is not sufficiently low.

Thus, the task of this invention is to obtain cigarette paper with the property of low flame spread and provides a low S/T ratio.

The present invention represents a cigarette paper with the property of low flame spread, which contains on one surface of the main cigarette paper, containing a filler in the amount of from 2 to bg/m, and having a density of from 16 to 22 g/m?, spaced from each other areas that suppress combustion are covered with a means that suppresses combustion, and the total amount of covering means that suppresses combustion is from 0.2 to 1.8 g per m? the area covered.

In the drawing:

The drawing shows a partial perspective view with a gap, schematically showing the structure of a cigarette in a wrapper made of cigarette paper, according to one of the variants of the implementation of this invention.

Next, this invention will be described in more detail.

In the cigarette paper of the invention, flame retardant coated areas are formed independently of each other on the same surface of the base cigarette paper.

Basic cigarette paper is produced from a common fiber pulp, such as flax fiber pulp, which is traditionally used to make cigarette paper. In the present invention, however, the base cigarette paper contains a filler in an amount of 2 to 6 bg/m? and has a density of 16 to 22 g/m7.

The filler used can be made from commonly used materials, including, for example, carbonates such as calcium carbonate and potassium carbonate, and hydroxides such as calcium hydroxide and magnesium hydroxide.

A burning agent such as citric acid or its salt (sodium salt or potassium salt) can be added to the cigarette paper. Such flame retardants, if added, can be used in basic cigarette paper in quantities up to 295 by weight.

The flame retardant areas, which are formed by applying a flame retardant to one of the surfaces of the base cigarette paper, are created independently of each other. The flame suppressing areas can be formed in the form of a plurality of strips such that when the tobacco rod is wrapped in cigarette paper, they extend in the longitudinal direction of the tobacco rod and are spaced from each other in the circumferential direction of the tobacco rod.

Alternatively, the flame-suppressing areas can be created in the form of a plurality of rings of a certain width so that they continue in the direction around the tobacco rod and are spaced from each other in the longitudinal direction of the tobacco rod. In any case, the total coverage amount of the fire suppressant (on a dry basis) is from 0.2 to 1.8 g/m2 per m? the area covered.

The flame retardant used can preferably be made from, for example, proteins such as gelatin, casein, albumin and gluten; polysaccharides with the ability to increase viscosity, such as starch, xanthan gum (luna gum), locust bean gum, guar gum (guar concentrate), tragacanth gum, tamarind seed polysaccharides (gliroid), carob gum, gum arabic, pullulan, dextrin, cyclodextrin (oligosaccharides containing seven glucose residues) and gutta-percha; polysaccharides with gel-forming properties, such as carrageenan, curdlan, agar-agar, gelatin, farselran, pectin, guaran gum and KeiYiso sei trademark gel; a lipid such as lecithin; derivatives of natural polymers such as sodium alginate, carboxymethyl cellulose, methyl cellulose, propylene glycol alginate ester and processed starch (such as phosphate starch); synthetic polymer compounds, such as sodium polyacrylate and various polymer emulsifiers; inorganic ammonium salts, such as ammonium chloride, ammonium phosphate, ammonium hydrogen phosphate, ammonium dihydrogen phosphate, ammonium bromide and ammonium sulfate; inorganic hydroxides, such as barium hydroxide, calcium hydroxide and aluminum hydroxide; flame retardants based on inorganic salts, such as sodium borate, boric acid, zinc chloride, magnesium chloride, calcium chloride and sodium sulfate. Finely powdered cellulose, microcrystalline cellulose, flax fibrous mass and wood cellulose also have similar effects. Such flame retardants can be used alone or in combination with two or more of the above. Sodium alginates with various degrees of polymerization are commercially available. In this invention, sodium alginate with a degree of polymerization of 500 to 900 is preferred. Sodium alginate with such a high degree of polymerization has a high ability to suppress combustion even when used in small amounts.

In the present invention, the property of low flame spread and low C/Y ratio can be detected simultaneously by adjusting the amount of filler in the base cigarette paper, the density of the base cigarette paper, and the total amount of flame retardant applied in the ranges described above.

The low flame spread cigarette paper of the invention is used to wrap a tobacco rod formed, for example, from a tobacco bag, and typically the surface on which the flame retardant is applied is in contact with the tobacco rod.

Figure 1 shows a cigarette with a wrapper made of cigarette paper on which a flame retardant is applied in the form of rings of a certain width.

The cigarette 10 shown in Fig. 1 contains a tobacco rod 11, consisting of a tobacco filler 13 in the form of a rod, which is wrapped with a basic cigarette paper 12. The basic cigarette paper 12 can have its own air permeability from about 10 to about 100 SOBE5TA units. In general, the tobacco rod 11 has a circumference of 17 to 26 mm and a length of 49 to 90 mm. A conventional filter 18 can be attached directly to the end (that is, the outermost section at the exit in the direction of tightening) of the tobacco rod 11 using a thin paper strip 17 according to the conventional method.

On the main cigarette paper 12 form an annular area 14, covered with a means that suppresses combustion, and a defining area that suppresses combustion. As illustrated in Fig.1, when forming a plurality of annular areas 14 that suppress combustion, such annular areas 14 are formed independently of each other in the longitudinal direction of the tobacco rod.

Between adjacent ring-shaped sections 14 that suppress combustion, a section 15 of normal flammability is formed, which is not covered with a means that suppresses combustion. Since the portion 15 formed by a part of the main cigarette paper 12 can burn in a normal smoking state like the main cigarette paper 12 as such. It follows that section 15 serves as a section of normal flammability.

For example, it is possible to form from 1 to 3 ring-shaped areas 14 that suppress combustion. The annular section 14 suppressing combustion can have a width of 4 to 7 mm in the longitudinal direction and usually has a thickness of 0.1 to 5 µm. When forming a plurality of fire-suppressing areas 14, the gap between adjacent fire-suppressing areas 14 is preferably from 18 to 25 mm.

In the cigarette shown in Fig. 1, the flame suppressant is not applied to the area 16, which occupies the interval a from the end. That part of the terminal area where no flame retardant is applied is also the area of normal flammability and may correspond to the area that ignites in a conventional cigarette from one puff or two puffs. In particular, when forming a set of sections 14 that suppress combustion, the section 16 of normal flammability may not be formed (0-0). However, when forming one section 14 that suppresses combustion, the gap a at the end Pa of the tobacco rod can be from 10 to 25 mm. In particular, there is no need to form a flame-suppressing area 14 on the inner surface of the cigarette paper corresponding to the area of the cigarette paper 12 that is covered by the thin paper strip 17.

When the cigarette 10 is lit at the end 11a and drawn in, subjecting it to burning, the cigarette can burn in the normal flammability area similar to a traditional cigarette and allows you to enjoy its aroma and taste. If the lit cigarette 10 is thrown onto a combustible material such as a carpet, straw mat, wooden product, clothing, or upholstery, the flame-suppressing portion 14 extending in the direction of combustion absorbs heat from the combustible material and the tobacco bag is inflated jointly contribute to the extinguishing of the cigarette 10 and protect the combustible material from ignition. Also, a cigarette wrapped in cigarette paper according to the invention has a low C/1 ratio in the smoke inhaled by the smoker.

Below, the present invention will be described with the help of examples. However, the present invention is not limited to the given examples.

Examples 1-13 and comparative examples 1-12

Using the gravure printing method, an aqueous solution of sodium alginate of various concentrations (from 0.5 to 20905 by mass) was applied (printed) in the form of strips on base paper (width 27 mm; length 1.500 m) with the technical characteristics listed in Table 1 at a constant 7" mm wide in the longitudinal direction and with a constant gap of 20 mm, forming a total of 56 flame retardant coated areas. For the cigarette paper thus obtained, the total amount of sodium alginate applied was measured according to the methods described below. The results are also tabulated 1. As can be seen from Table 1, in the papers according to examples 1-13, the total amount of flame retardant applied per m: of the area covered with the flame retardant (sodium alginate) was from 0.2 to 1.8 g. By multiplying by 7/27, the resulting applied amount of flame retardant can be converted to the amount of flame retardant per unit area of cigarette paper, giving weight from 0.05 to 0.47 g/m?. In particular, the sodium alginate used in each of Examples 5, 8 and 11 was I-5 produced by

KIMIKA (registered trademark) (degree of polymerization: from 650 to 670; viscosity of its 395th by mass aqueous solution at 2522: 29976.9сП3); and the sodium alginate used in each of the other examples was 1-2 produced by KIMICA (registered trademark) (degree of polymerization: 30 to 180; viscosity of its 395th by weight aqueous solution at 2522: 907 2sP3).

The cigarette paper obtained above was wrapped around a tobacco rod consisting of an American blend tobacco bag (resin amount without a filter: from 19 to 2Omg) and cut so that the first area with the coating was located at a distance of 5 mm from the end of the lit cigarette. Each cigarette was 59mm long and had two sections coated with a flame retardant.

The cigarette obtained in this way was subjected to a burning test according to the ABTM E-2187-04 method in order to measure the value of РРЕИ В (percentage of filler - length of burning). Also, using the methods described below, the amount of CO in the smoke inhaled by the smoker, the number of puffs, and the amount of resin in each cigarette sample were measured in the samples of the specified cigarettes. The results are shown in Table 2.

Measurement of the total applied amount of sodium alginate

Measurements were carried out in this way according to the method "Otsapiyaime Apaiuiiisa! Meipoa oi bodiit AiIdipae ip Rosa" (Quantitative analytical method for determining sodium alginate in food products), described in the magazine "Booi Nudiepisv Madalipe", vol. 5, p. 297-302 (1988), without defatting, treatment with dilute sulfuric acid and treatment to remove proteins.

Cigarette paper with an applied flame retardant (1.5000 m; width 27 mm), (about 1.0 g) was cut into pieces, each 5 mm in size. Then 40 ml of a 195% by weight aqueous solution of sodium bicarbonate was added to it and heated for 5 minutes in a warm water bath at 602C. The mixture was then moderately mixed, shaken and subjected to centrifugal separation (3500 rpm, 10 minutes; the same was used later), obtaining the supernatant (liquid extract). The residue obtained after extraction was subjected to extraction again in the same way, obtaining the supernatant liquid (liquid extract). In addition, 20 ml of a 195% by weight aqueous solution of sodium hydrogen carbonate was added and moderately mixed with the residue obtained after extraction, thereby obtaining a supernatant liquid (liquid extract). The three obtained liquid extracts were combined, the 195th by weight aqueous solution of sodium bicarbonate was added to 100 ml and used as the tested solution.

2 ml of a solution of copper-containing hydrochloric acid was added to each sample, consisting of 1 ml of the above-mentioned tested solution and 1 ml of a standard solution of sodium alginate (195th by mass aqueous solution of sodium hydrogen carbonate containing sodium alginate in a concentration from 0 to 0.2 mg/ml) (8.5M hydrochloric acid containing 0.0595% by weight of copper sulfate) and one ml of naphthoresorcinol solution (0.4965% by weight aqueous solution of 1,3-dihydroxynaphthalene). Then each mixture was heated for 65 minutes in a boiling water bath and then cooled in ice water to which 4 ml of butyl acetate was added. The mixture was shaken and subjected to centrifugal separation.

From the supernatant after centrifugal separation, 1 ml was taken, diluted by adding 3 ml of butyl acetate, subjected to colorimetric analysis at 566 nm and the total applied amount was calculated.

Measurement of the amount of CO and the number of puffs

To measure the amount of CO, tobacco smoke was collected using an 8-channel linear smoking machine (ZM 342) manufactured by RI/TAOMA Ips. For cigarette burning, 35 ml/2 seconds suction was performed at 60 second intervals according to I5O standards, and smoke passing through a glass fiber filter was collected in a gas bag. The suction of the cigarette sample was stopped when the sample reached the standard burning length (51 mm from the end of the lit cigarette (at a distance of 3 mm from the other end, if measured from the border between the cigarette paper and the thin paper strip)). At this stage, the number of contractions was counted and recorded. After burning, the burned area was removed and then an idle purge was performed three times to collect the gas remaining in the cigarette. Gas from the cigarette sample was collected in a gas bag, and all aerosol particles (APO) were collected on a glass fiber filter in the indicated manner.

The amount of CO per cigarette sample was measured using a CO measurement device manufactured by EI-TAOMA Ips., using gas collected in a gas bag.

Measuring the amount of resin

We weighed the amount of crude resin from the aerosol components collected during the measurement of the amount of CO on a fiberglass filter, and then the filter was inserted into a serum bottle and vigorously shaken together with 10 ml of 2-propanol (purity grade 24C, manufactured by Mako Udypuaki K.K.). The liquid extract was filtered and poured into a test tube. The liquid extract was then analyzed in a chromatograph in order to measure the amount of water and the amount of nicotine. Quantification was performed using the internal standard method and the amount of resin was obtained by subtracting the amount of water and the amount of nicotine from the amount of raw resin.

Table 1

the total number of

Example Basic cigarette paper of an applied flame retardant about, Means for

Density I and

Adjustment filler (|Air permeability (g/m-) and mass) in another 1752 | 81" | in comparison 1

Example for teachers 00052109 pe 10940102 090105 comparison With

R.- Z RYN DOESN'T KNOW NIVY NON NIE FOR SNO comparison 4

Example for the first 00210909 comparison 6

Example for comparison 8 comparison 9

Example for comparison 11

Example for

Example 10

Example 11

Example 12 721. 719 | 03 | yush with | 06

Table 2

The results of resin tests on the amount of CO ratio number

Example REGV (bo) cigarette per cigarette sl puffs notes (mg) (mu) impossible

Example for comparison 0-5 measure; the cigarette could not be extinguished

Example for comparison 0-5 measure; 12 the cigarette went out

Examples | 0-56. | 214 | 156 | 073 | 78

Example 2 7105. | 223 | 165 | 074 | 82

File3.////// | 0-5 | 228 | 170 | 0756 | 84

Example 4 /-/-:/ | 0-56. | 230 | 172 | 075 | 85

Example 5 | 0-5. | 220 | 16.3 | 074 | 79

Example/-/-:-/ | 0-5. | 23.0 | 174 | 076 | 84

Example 7 | 0-5. | 23.5 | 179 | 076 | 86

Example 8 //-/-/:/ | 0-5. | 234 | 164 | 070 | 82

Example 9 | 0-56. | 23.8 | 168 | 07 | 84 | J

Example 10.///-/-/-// | 0-56. | 251 | 181 | 072 | 90 | shZHRZL

Example 11 05 | 250 | 178 | 07 | 87

Example 12 05 | 2553 | 182 | 072 | 89

Example 3.//-/-:/ | 05 2 | 259 | 1858 | 073 | 91

From the results shown in Table 2, it can be seen that cigarette papers (Examples 1-13) in which the flame retardant is spaced apart on a base cigarette paper containing a filler in an amount of 2 to bg/m and has a paper density from 16 to 22 g/m, so that the total coverage amount is from 0.2 to 1.8 g/m7, has the property of low flame spread and a low C/1T ratio.

As described above, the present invention provides a cigarette paper that has the property of low flame spread and provides a low C/T ratio.

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Claims (3)

1. Cigarette paper with the property of low flame spread, which contains on one surface of the main cigarette paper, which contains a filler in the amount of 2 to 6 g/m" and has a density of 16 to 22 g/m", spaced from each other the fire-suppressing areas are covered with a fire-suppressing agent, and the total coverage amount of the fire-suppressing agent is from 0.2 to 1.8 g per m" of the area to be covered, and the fire-suppressing agent is sodium salt of alginic acid, which has a degree of polymerization from about 500 to about 900. 2. Cigarette paper according to item I, which differs in that the areas that suppress combustion are in the form of strips so that when the tobacco rod is wrapped with cigarette paper, they continue in the longitudinal direction of the tobacco rod and are spaced from each other in the direction around the tobacco rod 3. Cigarette paper according to item I, which differs in that the areas that suppress combustion are in the form of rings of a certain width so that when the tobacco rod is wrapped in cigarette paper, they continue in the direction around the tobacco rod 1 and are spaced from each other in the longitudinal the direction of the tobacco rod.