SK286989B6 - Item for smoking - Google Patents

Abstract

The invention relates to a ventilated filter cigarette, comprising a covered tobacco strand (1) and a filter (20) with ventilation means, with at least two filter pieces (22, 23). Ventilation holes (14) are arranged in the region of the mouthward filter piece (22). Furthermore, the mouthward filter piece (22) is made from a single filter segment (22), whilst the strandward filter piece (23) comprises a filter segment with a core (24) and a shell (26), a so-called coaxial filter piece or a coaxial filter.

Description

Technical field

The present invention relates to a ventilated filter cigarette according to the preamble of claim 1.

BACKGROUND OF THE INVENTION

According to the state of the art, various constructional solutions consisting of several parts with different substance properties are used in tobacco product filters for different purposes. In addition, filter ventilation is used to soften the smoke and reduce the intake of harmful substances.

Patents EP 474 940 B2 and EP 608 047 B1 disclose cigarette filters comprising a core core type segment consisting of a filter material different from the sheath. These cigarette filters are designed as core or coaxial filters. In the embodiment according to EP 474 940 B2 (Figure 5), the filter consists of two longitudinal sections, namely the ventilated portion of the filter with the core at the tobacco strand side and the integral part at the mouth side in which the orifice part of the filter plays an aesthetic role. A disadvantage of this cigarette filter is that the inner core shell of the core portion is of a smoke permeable material, which can therefore flow vertically to the barrier interface between the core and the core filter shell.

EP 0 558 166 B1 discloses a ventilated filter cigarette which also has an integral monofilter section on the mouth side and a filter section with a core on the tobacco strand side. However, the filter cigarette comprises an empty chamber between the two filter sections filled with adsorption medium (e.g., activated carbon). As a result, however, the taste of the smoke and the structure of its components are drastically altered by the adsorbent, which is unacceptable to many smokers.

Patent application EP 0 880 904 A1 and patent DE 39 01 226 C1, by means of the coaxial arrangement of the tobacco strand and the filter, have the task of producing a cigarette with particularly low condensation values, which is achieved in particular by the coaxial structure of the tobacco strand. The disadvantage of this solution, however, is the high cost of special production equipment required to produce the coaxial strand.

The aim of patent EP 539 191 B1 is to provide a ventilated cigarette with a particularly low weight. A disadvantage here is that, in order to design a cigarette with a particularly low density, the specific densities of the materials used (both the tobacco strand and the filter) must be minimized, thereby severely limiting the design options of the cigarette. In this case, the ventilation zone is in the filter part on the strand side.

SUMMARY OF THE INVENTION

It is an object of the present invention to provide a filter cigarette which does not have the above drawbacks and whose filter elements reduce the proportion of particulate matter in the smoke (e.g. nicotine) and thereby cause a disproportionately large drop in gaseous smoke components. smoker.

In addition, the aforementioned advantages of the filter are to allow a wider range of sensory visual and tactile properties.

A further object is to separate the tensile resistance of the filter from its retention, i.e. to increase the filter holding capacity to retain the substances contained in the smoke, without increasing the tensile resistance proportionally, which is an unreachable condition in today's filter designs.

It is a further object of the invention to provide a product with the above-mentioned advantages for commercial use, while avoiding filters with a chamber and in particular with a chamber filled with activated carbon, for tactile and sensory reasons.

A filter cigarette of the aforementioned type, which additionally has the features set forth in claim 1, serves to solve this problem.

The invention is described in the following with reference to examples.

The filter cigarette consists of a tobacco strand portion 10 and a filter 20. The tobacco strand portion 10 is formed of a one-piece tobacco strand 11 and a wrap 12 surrounding the tobacco strand 11. The filter 20 comprises at least two filter sections 22 and 23 and is connected to the strand portion 10. wrapping paper 13 which extends at least 3 mm over the filter 20. In addition, the tobacco strand 11 has a length of 55 to 75 mm, while the length of the filter 20 is 21 to 27 mm.

The filter 20 has ventilation at the mouth side of the filter. The ventilation range can be selected from 10% to 90%.

On the mouth-side filter portion 22, the wrapping paper 13 is provided with ventilation vents 14 arranged in 1 to 3 rows, preferably 2 rows, around the filter 20, while the wrapping paper 13 of the tobacco strand side filter portion 23 is completely impermeable. In smoking, the ventilation air is sucked through the vent holes 14 into the filter 20, which results in a disproportionately large reduction in its gaseous component compared to the drop in particulate matter in the tobacco smoke. In one embodiment, the ventilation medium may shift somewhat, about 2 mm, beyond the mouth side filter portion into the tobacco strand side filter portion. In this way too, the ventilation air is sucked into the mouth-side filter portion 22 after changing direction.

Those skilled in the art are familiar with methods for making vent holes, for example mechanical or electrostatic methods or laser techniques. Other common methods of venting cigarettes are tubes, ducts, or gaps in the texture.

The mouth portion of the filter 22 comprises at least one segment. The mouth portion of the filter may also consist of two or more filter plugs, as shown in Figure 2. This increases the possibility of filter material variability, for example the ability to add an additional filter element 22a to the mouth side filter element 22b which may have a cross-sectional area. printing or coloring.

The strand-side filter portion 23 representing the coaxial portion of the filter has a core 24 and a sheath 26 coaxially surrounding the core. The pressure drop induced by the core 24 may be between 10 and 50 mm water column (WC). The sheath 26 is made to produce at least a double pressure drop compared to the core 24. The sheath may also be substantially impermeable to smoke. The surface 25 of the core 24 is made to be substantially impermeable to smoke or to have a smoke impermeable enclosure.

The construction of the tobacco strand filter side 23 results in the smoke flowing predominantly through the core 24. As a result of the cross-sectional narrowing, the smoke flow velocity within the core significantly increases, which inevitably leads to an increase in tensile resistance at a proportionally lower retention. A similar result is obtained when the cross-section of the material flowing through the smoke is reduced, this being achieved by making the core of the coaxial filter plug almost impermeable, so that the smoke then flows almost exclusively through the filter housing.

Only when the smoke velocity of the tobacco strand side filter section 23 is increased several times can the ventilation side 14 be supplied to the mouth side section 22 to a large extent. This results in a disproportionately large drop in the gas phase ratio relative to the particulate phase. ensures acceptable tensile resistance for the smoker.

In contrast to the prior art solutions, the possibilities of alternative solutions within the given objectives are very numerous, since in the cigarette with the filter according to the invention, a disproportionately large decrease in the gaseous content does not have a significant effect on tensile resistance. air ".

Filter materials for filter 20 are flat, fibrous or granulated filter materials such as cellulose, cellulose ester - especially cellulose acetate, melt blown filter material, such as manufactured according to WO 97/33026, "air-laid" A filter material comprising additives, tobacco, for example according to DE 199 25 968, reconstituted tobacco, other easily decomposing filter materials or thermoplastic filter materials.

In terms of taste, feel or appearance, the addition of additives and / or affect selective retention may contribute to improving the quality of the cigarette of the invention. For example, the filter element, such as the filter portion 22, may be provided with activated carbon particles in order to increase the adsorption of the gas phase. To increase the attractiveness of the cigarette for consumers and to improve the visual quality, it is possible to dye the filter on the mouth side. When using acids or bases, it is possible to influence the pH of the particles and thus the taste of the smoke.

Additives can be introduced by sprinkling or spraying filter materials, such as fibers, or also by direct injection into a strand of material.

Useful additives to filter materials are: flavors, acids or bases in suspended or dissolved form, additives with a selective retention effect, adsorbents such as activated carbon or SiO ₂ . Other selectively active ingredients are organic acids, bases, for example hydroxycarboxylic acids and their salts, metals and metal oxides, nitrogen compounds, ion exchange systems (for example zeolites), alcohols, polyphenols and porphyrin derivatives.

Other additives such as plasticizers, for example triacetin, triethylene glycol diacetate or citric acid diethyl ester, light accelerating agents such as titanium dioxide, biodegradability enhancing additives, vitamins and / or color pigments may be used to individually form the desired filter design.

As a range for other cellulose acetate specifications, the following values are applicable: for the core 24, a single fiber fineness in the range of 3.0 to 8.0 denier, preferably 8.0 denier, and a total fineness in the range of 15,000 to 50,000 denier, preferably 17,000 denier. For the sheath 26, the fineness of the single fiber is in the range of

1.5 to 3.0 denier, preferably 2.1 denier and a total fineness ranging from 40,000 to 75,000, preferably 55,000 denier.

The range for the single fiber fineness in the mouth side filter portion 22 for cellulose acetate as filter material, which may consist of two or more similar or different types of segments 22a and 22b, may be 1.5 to 5 denier and a total fineness of 15,000 up to 60,000 denier.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 shows a schematic illustration of a filter cigarette according to the invention.

Figure 2 shows a schematic illustration of another embodiment of a filter cigarette according to the invention.

DETAILED DESCRIPTION OF THE INVENTION

Example 1

Cigarette A had a tobacco strand 11 of 63 mm long and a multi-piece filter 20 of 21 mm long.

The core 24 of the tobacco strand filter side 23 had a diameter of 5.5 mm and a length of 8.0 mm. It was cellulose acetate with a single fiber fineness of 6.0 denier and a total fineness of 17,000 denier. The tensile resistance or pressure drop of the core 24 was about 27 mm WC.

The sheath 26 coaxially surrounding the core 24 had an inner diameter of 5.5 mm and an outer diameter of 7.8 mm at 15 length also 8 mm. Cellulose acetate with a single fiber fineness of 2.1 denier and a total fineness of 55,000 denier was used as the material.

In total, the coaxial portion of the filter had a length of 8.0 mm at a diameter of 7.8 mm.

The orifice filter portion 22 was of one piece and was of cellulose acetate. It had a diameter of 7.8 mm at a length of 13 mm. The area of the mouth side filter portion 22 was provided with a ventilation zone in the form of a series of laser-formed perforations. The ventilation rate of cigarette A reached 35%.

Example 2

For the purpose of assessing cigarette A from Example 1, its smoke analysis data was compared to that of a cigarette VI equipped with a conventional cellulose acetate filter of 21 mm length, a single denier of 25 threads of 3.0 denier, and 18% filter ventilation, that were smoked according to ISO. The resulting smoking use data is shown in Table 1.

Table 1

Cigarette VI Cigarette A delta (%) Condensate (mg / CIA) 11.9 11.9 0.00 Nicotine (mg / CIA) 0.86 0.9 0.04 CO (mg / CIA) 10.5 8.4 20.0 NO (μΙ / CIA) 140.6 111.9 20.4 Σ other proportions of gaseous components (gg / CIA) 2,169.7 1,666.1 23.2

Example 3

Cigarette B had a 59 mm long strand of tobacco and a 20 mm multi-piece filter of 20 mm.

The core 24 of the tobacco strand filter side 23 had a diameter of 5.5 mm and a length of 10.0 mm. It was ace35 cellulose with a single fiber fineness of 6.0 denier and a total fineness of 17,000 denier. The tensile resistance or pressure drop of the core 24 was about 25 mm WC.

The sheath 26 coaxially surrounding the core 24 had an inner diameter of 5.5 mm and an outer diameter of 7.8 mm at a length of 10.00 mm. Cellulose acetate with a single fiber fineness of 2.1 denier and a total fineness of 55,000 denier was used as the material.

In total, the coaxial filter portion 23 had a length of 10.0 mm at a diameter of 7.8 mm.

The orifice filter portion 22 was of one piece and was of cellulose acetate. It had a diameter of 7.8 mm at a length of 15 mm. The mouth portion of the filter portion 22 has been provided with a ventilation zone in the form of a series of laser vent holes 14. The ventilation rate of cigarette B reached 51%.

Example 4

For the purpose of evaluating cigarette B from Example 3, smoke analysis data was obtained and compared to a V2 cigarette equipped with a conventional 25 mm cellulose acetate filter and 3.0 denier single fiber fineness and 38% filter ventilation, which have been smoked according to ISO. The resulting smoking use data is shown in Table 2.

SK 286989-6

Table 2

Cigarette V2 Cigarette B delta (%) Condensate (mg / CIA) 6.9 6.9 0.00 Nicotine (mg / CIA) 0.56 0.59 -5.36 CO (mg / CIA) 5.5 4.2 23.6 NO (μΙ / CIA) 59.9 44.5 25.7 Σ other proportions of gaseous components (pg / CIA) 1,370.2 1070.0 21.9

It is evident from the examples that in the filters of the new construction, the decrease in the content of gaseous components in the cigarette smoke relative to the decrease in the content of particulate components is disproportionately high.

Claims (15)

Cigarette with a wrapped tobacco strand filter and a filter (20), which is provided with ventilation, the filter comprising at least two parts (22, 23), the ventilation being provided in the area of the mouth side filter part (22) and the part (22) the mouth-side filter is at least a one-part filter part and the tobacco-strand side filter part is a coaxial core-sheath part (26), characterized in that the tobacco strand (11) is a one-piece strand; and that the pressure drop in the core (24) is less than the pressure drop in the sheath (26). A ventilated filter cigarette according to claim 1, characterized in that the mouth-side filter portion (22) consists of a flat, fibrous or granular or degradable filter material. A ventilated filter cigarette according to claim 2, characterized in that the filter material is cellulose, cellulose ester, preferably cellulose acetate, melt blown filter material, air-laid filter material, additive material, tobacco, other easily degradable filter materials or thermoplastic filter fibers. A ventilated filter cigarette according to claim 2 or 3, characterized in that the filter material comprises an additive. A ventilated filter cigarette according to claim 4, characterized in that flavoring substances, acids or bases in suspension or solution, or selectively selected adsorbents such as activated carbon or SiO ₂ are used as additives. A ventilated filter cigarette according to claim 1 to 5, characterized in that the core (24) in the coaxial strand-side filter part (23) consists of a fibrous material of low fineness, the value being in the range of 3 for a single fiber. 0 to 8.0 denier and a total fineness ranging from 15,000 to 50,000 denier. A ventilated filter cigarette according to claim 6, characterized in that the single fiber fineness is 6.0 denier and the total fineness is 17,000 denier. A ventilated filter cigarette according to claims 1 to 5, characterized in that the sheath (26) of the coaxial filter section (23) on the sliver side of the fibrous material has a single fiber fineness in the range of 1.5 to 3.0 denier and a total fineness in the range of 40,000 to 75,000 denier. A ventilated filter cigarette according to claim 8, characterized in that the single fiber fineness is 2.1 denier and the total fineness is 55,000 denier. A ventilated filter cigarette according to claim 1, characterized in that the pressure drop ratio in the core (24) to the pressure drop in the sheath (26) is greater than 2. A ventilated filter cigarette according to claim 10, wherein the ratio of pressure drop in the core (24) to the pressure drop in the sheath (26) is about 6. A ventilated filter cigarette according to claim 1, characterized in that the surface of the core (24) is wrapped so that it is air impermeable or treated in an air impermeable manner. A ventilated filter cigarette according to claim 1, characterized in that the reduction of the gaseous component content achieved by ventilation is between 10 and 90%. A ventilated filter cigarette according to claim 13, characterized in that the reduction of the gaseous content by ventilation is between 10 and 50%. A ventilated filter cigarette according to claim 1, characterized in that the ventilation means is moved beyond the mouth side filter portion into the tobacco strand side filter portion, wherein ventilation air is supplied to the mouth side filter portion.