CZ20001596A3 - Cigarette with reduced gaseous phase - Google Patents

Abstract

Cigarette has a filter containing 20-50 wt.% micro-fine active carbon behind a string of tobacco wrapped in cigarette paper. The remainder of the filter is wrapped in paper made of cellulose acetate forming a ventilation zone. Cigarette has a filter containing active carbon behind a string of tobacco wrapped in cigarette paper. The section of the filter adjacent to the tobacco is surrounded by thick cigarette paper containing 20-50 wt.% micro-fine active carbon. The remainder of the filter is wrapped in paper made of cellulose acetate forming a ventilation zone. The ratio of condensate retention capacity on the tobacco side filter paper to that on the mouth side = 1:1-2. The air permeability of the cigarette paper = 40-100 Coresta units, and the ventilation grade = 5-60%.

Description

Technical field

The invention relates to a cigarette according to the feature of the main claim 1.

BACKGROUND OF THE INVENTION

It is known that by depositing surface-rich materials in a filter, such as activated carbon, a portion of the gaseous smoke components can be retained from the smoke. Selective retention of this kind leads to undesirable taste changes and thus rejects such products by smokers. Attempts to compensate for this negative accompanying phenomenon are very costly, complicated and costly, see also DE 41 05 500.

Usually, vapor phase active filters are in most of the chamber filters, which are divided into three segments and contain in the middle chamber surfactant material such as activated carbon, sea foam, silica gel etc. These systems are very expensive in design and have a serious disadvantage in that the stability of the chamber with respect to compression during smoking is unsatisfactory. Another solution is the construction of double filters in which activated carbon is dispersed in small amounts in the filter element on the side of the tobacco column. These constructions have limited and, for many applications, unsatisfactory gas phase reduction. All known constructions are a common negative taste change, which a smoker refers to as a coal taste.

A noticeable but not yet satisfactory improvement was shown when using tissue paper containing coal mixed with micronised coal (grain size <15 μιη).

SUMMARY OF THE INVENTION

SUMMARY OF THE INVENTION It is an object of the present invention to provide a cigarette with an active gas-phase filter which is both highly efficient and at the same time cost-effective to manufacture.

The feature of claim 1 serves to solve this task.

The invention therefore relates to a filter cigarette comprising activated carbon in a filter:

(a) a column of tobacco surrounded by cigarette paper;

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(b) a double filter in which the column - side part consists of tissue paper containing coal; and

c) a ventilating zone of the cellulose acetate filter extending in the circumferential direction in the mouth-side portion;

d) the tissue side of the column side filter is a very voluminous paper containing 20 to 50 wt% micronised milled activated carbon;

(e) the ratio of the condensation retention capacities of the column side filter portion and the mouth side filter portion is between 1 and 2;

f) the air permeability of the cigarette paper is 40 to 100 Coresta units; and

g) the filter ventilation stage is 5 to 60%.

Preferred embodiments of the invention are the subject matter of the features of the dependent claims.

In a filter cigarette according to the invention, the porosity of the cigarette paper is 30 to 60 rel% higher than the porosity of the cigarette paper of a comparable cigarette made with a conventional filter and the ventilation degree of the filter is 10 to 60 rel. % lower than the filter ventilation stage of a comparable cigarette manufactured with a conventional filter.

Tissue paper has a grammage of about 40 - 60 g / m ² , an activated carbon content of 15 - 50% and a thickness of 150 - 200 μίτι. A preferred variant has a grammage of 50 g / m ² and an activated carbon content of 30% at a thickness of 180 µm.

In a particular embodiment, the column side filter section of the double core filter is a DE 42 05 658 C2 filter in which the core is made of tissue paper containing coal as in the aforementioned embodiment, which is wrapped in a material-impermeable sheath mainstream smoke. This smoke-impermeable material consists, for example, of heavily compressed cellulose acetate fibers.

Surprisingly, it has been shown that the insertion of a vapor phase active material has a decisive effect not only on the vapor phase reduction but also on the specific retention ratios of the individual filter segments in combination with the ventilation ratios of the cigarette. Combinations B, D and F of the retention and ventilation ratios have been shown to be particularly favorable. Combinations A, C and E are known cigarettes that have been altered by combinations B, D and F of the invention.

Sensory comparisons were conducted by a panel of experts and gave the following results: cigarettes A and B differ only in terms of reactivity, with variant B being • 9 99 ·· 9 99 ··

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C and D cigarettes differ in reactivity in the same way, with the tobacco flavor of variant D being more pronounced.

Experts also reached the same result when comparing E and F. The F variant was clearly less reactive, but had an increased tobacco flavor.

It is striking that the retention quotient of the individual filter segments is larger with decreasing condensate and nicotine values. At the same time, to achieve at least the same quality of tobacco flavor, it is necessary to increase the porosity of the cigarette paper of the currently compared cigarette while reducing filter ventilation. The reason for the better relative setting of the aroma quality could be the stratification of the particle size in the mainstream smoke, which is the determinant of different flow rates and thus influences the different temperatures at which tobacco smoldering occurs. Experiments have shown that when the test and comparative cigarettes adapt to each other according to the flow, so-called coal taste and a decrease in aroma quality occur.

In addition to the known acetate monofilter, other embodiments can be used to adjust the desired retention ratio of the filter section from side to column to side to mouth: the coaxial design of the mouthpiece section provides the ability to independently adjust the desired retention and desired open pull resistance simultaneously cigarettes.

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DETAILED DESCRIPTION OF THE INVENTION

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Table 1

Full Flavor Lights Ultra low tar AND (B) C D E F Overall Length [mm] 84 84 84 84 84 84 Tobacco column length [mm] 63 63 59 59 59 59 Filter length [mm] 21 21 25 25 25 25 Tobacco column weight [mg] 820 820 690 690 620 620 Tensile resistance [daPa] 75 75 140 Filter type Monofiltr Dvojfiltr Monofiltr Dvojfiltr Monofiltr Dvojfiltr Filter material Acetate cellulose Acetate cellulose Acetate cellulose Individual denier 3.0 y 2,1 y Total denier 35 000 55 000 Manufacturer Rhodia Rhodia Column Side Element: Length [mm] 13 13 13 Tensile resistance [daPa] 13 65 97 Material Angular Paper Angular W Angular Paper Mouth side element: Length [mm] 8 12 12 Tensile resistance [daPa] 24 28 33 Material Acetate cellulose Acetate cellulose Acetate cellulose Individual denier 2,5 y 3.04 y 2.54 y Total denier 35 000 35 000 35 000 Condensate [mg / cig 12.0 —TZ7J— /, 2 /, 0 2.3 2.0 Nicotine [mg / cig.] 0.80 0.83 0.64 0.66 0.22 0.24 Paper porosity (Coresta) 24 43 60 80 40 80 Filter ventilation [%] 20 May 17 40 35 70 60 Total retention [%] 38 38 50 50 70 70 Individual retention [%] (column side) 19 Dec 28 45 (on the side of the mouth) 19 Dec 22nd 25 Retention coefficient (column / mouth) 1 1,27 1.8

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Claims (3)

PATENT CLAIMS 1. A filter cigarette, characterized in that the filter comprises activated carbon with: (a) a column of tobacco surrounded by cigarette paper; (b) a double filter in which the column - side part consists of tissue paper containing coal; and c) a ventilating zone of the cellulose acetate filter extending in the circumferential direction in the mouth-side portion; d) the tissue paper of the column side filter portion is a highly voluminous paper containing 20 to 50% by weight micronised milled activated carbon; (e) the ratio of the condensation retention capacities of the column side filter portion and the mouth side filter portion is between 1 and 2; f) the air permeability of the cigarette paper is 40 to 100 Coresta units; and g) the filter ventilation stage is 5 to 60%. Filter cigarette according to claim 1, characterized in that the tissue paper of the column side filter part comprises 30 wt. % micronised ground activated carbon. Filter cigarette according to claim 1 or 2, characterized in that the column-side filter section is a Core filter, wherein the tissue paper core comprising a coal according to one of the preceding claims is surrounded by a jacket of material impermeable to mainstream smoke.