ES2199807T3 - CIGARETTE WITH VENTILATED FILTER. - Google Patents

Abstract

Cigarette with filter comprising a strand of wrapped tobacco and a filter (7) having a ventilation means, said filter being composed of two filter parts (3, 4), in which - the ventilation means are arranged by the zone of the filter part (3) on the side of the tobacco strand; - the filter part (3) on the side of the tobacco thread is a one-piece part and the filter part (4) on the side of the mouth is a coaxial filter part with a core (1) and a shirt (2); - the pressure drop of the core (1) being less than the pressure drop of the jacket (2).

Description

Cigarette with ventilated filter.

The invention relates to a cigarette with Vented filter according to the preamble of claim 1.

In EP 0 875 160 A1, a ventilated filter cigarette, which comprises a part of filter that features a coaxial filter core and a jacket filter surrounding the coaxial filter core. In the area of bliss coaxial filter parts are provided holes ventilation for the introduction of ventilation air into the shirt. The material specifications and dimensions of the individual elements of the tobacco strand and the filter have been selected in such a way that, when the smoker covers the holes of ventilation, the smoke is guided, by way of a valve inversion, substantially by the filter jacket, while in If the ventilation holes are not covered, the smoke passes mainly by the filter core of the filter part coaxial. Therefore, the objective of this development is to be able quantitatively control smoke performance according to different consumer behaviors, for example minimize the increase of condensate values.

Physically, said smoke is an aerosol, that is a mixture formed by air and droplets of liquid. These droplets they can have different sizes that, however, cannot Detect with the human eye.

The evaluation of the taste of tobacco smoke by part of the consumer, that is to say the quality of aroma and / or the intensity of the flavor effect, is influenced by the flow rate of smoke and droplet size as well as by the distribution of same, which can be measured by means of mobility analyzers or collecting and sorting smoke selectively by weight or particle size

The objective of the invention is to create a filter construction that allows to control the distribution of droplet size, supplied to the smoker, and smoke flow.

To achieve this goal, a cigarette presenting the characteristics of the claim one.

If the surface of the core by the side of the mouth of the filter part has been wrapped with a material waterproof or made waterproof, a flow can be avoided mainstream smoke.

This achieves a substantial improvement of the flavor compared to the state of the art.

The solution according to the invention has resulted in a filter construction that displays its action in several stages:

In the first stage, the values of condensate and nicotine in the filter part facing the strand of tobacco over a very short distance. In the second stage, you have place a decrease in the filter diameter used by smoke mainstream, which accelerates the smoke in this area to a speed about three times higher. A construction of filter of this type causes a substantial increase in aroma in comparison with a conventional filter at very condensate values low. It has been found that both the composition of the smoke and the average droplet size can be influenced by means of change of flow, thus allowing to increase the effect of aroma and therefore the taste more substantially more high.

Since the cigarette according to the invention is it has decoupled the tensile strength of the retention, it can also achieve an easy aspiration, which is very Nice for the smoker.

Next, the invention will be illustrated with greater detail referring to a schematic drawing.

The drawing shows, in a representation schematic, a filter cigarette that comprises a strand of tobacco 6 and a filter 7, arranged in the conventional manner one behind another collinearly and joined together by means of a wrapping paper 8. Usually, the tobacco thread presents a length between 55 and 75 mm, while the length of the filter is between 21 and 27 mm. Wrapping paper 8 overlaps the point of intersection between filter 7 and the strand of 6 tobacco in about 2 to 5 mm. Filter materials Suitable for filter 7 include filter materials in the form of sheet, in the form of fiber or in the form of granules, such as cellulose, cellulose esters, preferably cellulose acetate, filter material of the "meltblown" type, prepared for example according to WO 97/33026, filter material of the type "airlaid", prepared for example according to US document 4,375,447, filter materials to which they can be added additives, tobacco, other easily degradable filter materials or thermoplastic filter fibers.

The additives can be added by means of spreading or projection on the filter materials, by example fibers, or alternatively by direct injection into the strand of material

Among the additives that are suitable for the material filter, the following are included:

Aromatic substances, acids or bases in form suspended or dissolved, or selective acting adsorbents, such as active carbon or SiO2. The pH values of the spectra of particles can be influenced by the addition of acids or bases.

Other additives with selective retention action include organic acids and their salts, metals and metal oxides, nitrogen components, ion exchanger systems (eg zeolites), alcohols, polyphenols and derivatives porphyrinics

Tobacco thread 6 is followed, first, a filter part 3 on the side of the tobacco strand in the form of a so-called monofilter, which is followed by the opposite end of the tobacco strand 6 a filter part 4 by the side of the mouth in Shape of a coaxial filter.

The monofilter 3 that forms the filter part by the side of the tobacco strand has been prepared from one of the filter materials mentioned above, preferably of cellulose acetate, with an individual titer of 2.50 den and a global title of 35,000 den, which has been optionally added active carbon

In one embodiment, the outer diameter of the filter part 3 on the side of the tobacco strand is 7.8 mm, and its length amounts to 13.0 mm. The pressure drop in the part of filter 3 on the side of the tobacco strand should be placed by example in 30 to 50 mmWS, preferably in 42 mmWS.

Exclusively through the area of the filter part 3 on the side of the tobacco strand, wrapping paper 8 has been provided with ventilation holes 5 as the means of ventilation, which are arranged in the form of 1 to 3 rows, preferably 2 rows, of holes around filter 7, while in the area of the filter part 4 on the side of the mouth wrapping paper 8 is completely waterproof. Air of ventilation is sucked into filter 7 through the holes of ventilation 5, which is achieved by the area of the filter part 3 on the side of the tobacco strand the condensate and nicotine values of the current smoke main, coming from the tobacco strand 6. It is known by the experts in the field how the holes of ventilation, for example mechanically or electrostatically or by laser drilling medium. Other means of ventilation Also known are cannulas or notches of material.

The filter part 4 on the side of the mouth that form a coaxial filter features a core 1 and a jacket 2 that surrounds core 1 coaxially.

The core pressure drop can be located between 10 and 50 mmWS. The shirt is designed such that its fall from pressure exceeds that of the core by at least a factor of 2. The shirt can also be smoke impermeable.

Example Realization with a 21 mm long filter

Core 1 had a diameter of 4.0 mm with a length of 8.0 mm. In one embodiment, it was prepared to from cellulose acetate with an individual title of 6.0 den and a global title of 17,000 den. Tensile strength or Core 1 pressure drop was 20 mmWS.

The jacket 2 that surrounds the core 1 coaxially It had an internal diameter of 4.0 mm and an external diameter of 7.8 mm with an equal length of 8.0 mm. The material used was cellulose acetate with an individual title of 2.1 den and a title overall of 55,000 den, which resulted in a pressure drop of 120 mmWS.

Therefore, the added length of the filter Coaxial was 8.0 mm with a diameter of 7.8 mm.

The interval suitable for other forms of realization is: for the core, an individual title included between 3.0 and 8.0 den, preferably 6.0 den, and a global title between 15,000 and 50,000 den, preferably 17,000 den. For the shirt, an individual title between 1.5 and 3.0 den, preferably 2.1 den, and a global title between 40,000 and 75,000 den, preferably 55,000 den.

The interval for the individual title by side of the tobacco strand is 1.5 to 5 den and for the title overall from 15,000 to 60,000 den.

Filter specification Core Shirt Part of filter by the strand side Material AC AC AC Specification of fiber Denier 6.00y / 17,000 2.10y / 55,000 2.50y / 35,000 individual / global Diameter mm 4.0 External 7.8 7.8 Internal 4.0

(Continuation)

Filter specification Core Shirt Part of filter by the strand side Surface cross TO mm2 12.6 35.2 47.8 Cross surface TO % 26.4 73.6 100 Long mm 8.0 8.0 13.0 Fall from Pressure mmWS twenty 120 42 Pressure drop ΔP % 16.7 83.3 - Flow rate S S = 100 - ΔP % 83.3 16.7 100 Factor S / A 3.2 0.2 1.0

The example cited above shows that got a flow rate three times higher in the core compared with the flow in the filter part on the side of the strand.

Claims (12)

1. Cigarette with filter comprising a strand of wrapped tobacco and a filter (7) presenting a means of ventilation, said filter being composed of two parts of filter (3, 4), in which

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the means of ventilation are arranged by the area of the filter part (3) on the side of the tobacco thread;

-

the filter part (3) On the side of the tobacco strand is a part of a single part and the filter part (4) on the side of the mouth is a part coaxial filter with a core (1) and a jacket (2);

-

being the fall of core pressure (1) less than the pressure drop of the jacket (two).

2. Cigarette with vented filter according to claim 1, wherein the filter part (3) on the side of the tobacco strand consists of a filter material in the form of sheet, in the form of fiber, in the form of granules or in a material of degradable filter 3. Cigarette with vented filter according to claim 2, wherein the filter material used is cellulose, a cellulose ester, preferably acetate cellulose, a filter material of the "meltblown" type, a filter material of the "airlaid" type, a filter material to which additives, tobacco, other filter material can be added Easy degradation or thermoplastic filter fibers. 4. Cigarette with vented filter according to claim 2 or 3, wherein the filter material has been additive added 5. Cigarette with vented filter according to claim 4, wherein the additives used are substances aromatics, acids or bases in suspended or dissolved form, or selective action adsorbents, such as activated carbon or SiO_ {2}. 6. Cigarette with vented filter according to any one of claims 1 to 5, wherein the core (1) of the coaxial filter part (4) on the side of the mouth is constituted by a thick title fiber material, placing the value for the individual title in the range of 3.0 to 8.0 den and the global title in the range of 15,000 to 50,000 den. 7. Cigarette with vented filter according to claim 6, wherein the individual title is 6.0 den and the global title of 17,000 den. 8. Cigarette with vented filter according to any one of claims 1 to 5, wherein the shirt (2) of the coaxial filter part (4) on the side of the mouth is consisting of a fiber material with an individual title between 1.5 and 3.0 den and the global title is comprised between 40,000 and 75,000 den. 9. Cigarette with ventilated filter according to claim 8, wherein the individual title is 2.1 den and the global title of 55,000 den. 10. Cigarette with vented filter according to claim 1, wherein the pressure drop ratio of the core (1) to that of the shirt (2) is greater than 2. 11. Cigarette with vented filter according to claim 10, wherein the ratio of the pressure drop of the core (1) with respect to that of the shirt (2) is 6. 12. Cigarette with vented filter according to claim 1, wherein the core surface has been wrapped with an air impermeable material or has been made impermeable to air.