HUP0201384A2 - Ventilated filter cigarette - Google Patents

Description

^Ύ . *

Ventilated filter cigarette

The invention relates to a filter cigarette with a tobacco rod having a casing and a filter with ventilation, which consists of two filter parts.

EP 0 875 160 A1 discloses a ventilated filter cigarette which has a filter part which is provided with a coaxial filter core and a filter cover surrounding the coaxial filter core. In the section of this coaxial filter part, ventilation holes are provided in the cover for the introduction of ventilation air. The design of the material specification of the tobacco rod and the dimensioning of its individual elements and the filter are designed in such a way that, if the smoker covers the ventilation holes and thereby forms a "switching valve", the smoke is essentially guided through the filter cover, while in the case of uncovered ventilation holes, the smoke flows mainly through the filter core of the coaxial filter part. The purpose of this design is therefore to allow quantitative control of smoke utilization according to the different needs of smokers, for example to minimize the increase in condensate values.

Physically, this smoke is an aerosol, a mixture of air and liquid droplets. The size of the liquid droplets can vary significantly, but this cannot be detected by the human eye.

The smoker's evaluation of the tobacco rod's flavor, i.e. the quality or intensity of the flavor impression, is influenced by the smoke flow rate and the droplet size and its distribution - which can be measured with mobility analyzers or by selective collection and sorting according to particle size or particle weight.

The aim of the invention is to create a filter construction that allows the droplet size distribution and the tobacco flow rate to be controlled.

95715-2900 SR-Sch

-2 speeds are adjustable.

The solution to the problem according to the invention is a tobacco rod with a filter cigarette casing and a filter with a ventilation option, which consists of two piercing parts, where - the ventilation option is arranged on the tobacco rod side of the filter part; the tobacco rod side filter part is a one-piece filter part and the lip side filter part is a coaxial filter part with a core and a jacket; - where the pressure drop of the core is smaller than the pressure drop of the jacket.

If the surface of the core in the lip-side filter section is airtightly covered or made airtight, the transverse flow of the main stream of smoke can be avoided.

This allows a significantly better taste to be achieved compared to the prior art.

The solution according to the invention has led to a filter design that operates in several stages:

In the first stage, the condensate and nicotine values are adjusted over a very short path in the filter section towards the tobacco rod, in the second stage, the filter diameter used by the mainstream smoke is reduced, which accelerates the smoke to about three times its speed in this section. Such a filter design results in a significant increase in aroma with low condensate values compared to conventional filters. It has been proven that both the smoke composition and the average droplet size can be influenced by changing the flow rate, and in this way the aroma impression and thus the taste increase significantly at higher flow rates.

Since in the case of the cigarette according to the invention, the smoking resistance and the retention are interrelated, in addition to the above, extremely pleasant smoking conditions can be achieved for the smoker.

The invention will be described in more detail below with reference to an exemplary embodiment, based on the drawing. The accompanying drawing shows a schematic representation of a filter cigarette with a tobacco rod 6 and a filter strip 7, which are arranged collinearly behind each other in the usual manner and are connected to each other by a wrapping paper 8. The length of the tobacco rod 6 can usually range from 55 to 75 mm, and the length of the filter is

-321 - 27 mm. The wrapping paper 8 overlaps the connection point between the filter 7 and the tobacco rod 6 by a length of about 2 - 5 mm. Sheet-shaped, fibrous or granular filter materials can be used as filter materials for the filter 7, such as cellulose, cellulose ester, preferably cellulose acetate, meltblown filter material, for example prepared according to WO 97/33 026, Airlaid filter material, for example prepared according to US 4 375 447, filter materials that can be mixed with additives, tobacco, and also other easily degradable filter materials or thermoplastic filter fibers.

The addition of additives to filter materials - such as fibers - can be done by spraying or atomization or even by direct injection into the material.

The following can be used as additives for the filter material: aromatic substances, acids or bases in suspended or dissolved form or selectively acting adsorbents such as activated carbon or SiO2. The pH value of the particle spectra can be influenced by the addition of acids or bases.

Additional additives with selective retention effects may include organic acids and their salts, metals and metal oxides, nitrogen components, ion exchange systems (e.g. zeolites), alcohols, polyphenols and porphyrin derivatives.

A tobacco rod-side filter part 3 is directly connected to the tobacco rod 6, in the form of a so-called monofilter, to the end of which opposite the tobacco rod 6 is connected a lip-side filter part 4 in the form of a coaxial filter.

The monofilter forming the filter part 3 on the tobacco rod side consists of one of the above-mentioned filter materials, preferably cellulose acetate, with an individual fineness of 2.50 den and a total fineness of 35,000 den, and is optionally mixed with activated carbon.

The outer diameter of the tobacco rod-side filter section 3 is, according to one embodiment, 7.8 mm, and the length is 13.0 mm. The pressure drop in the tobacco-side filter section 3 is, for example, 30-50 mm WS, preferably 42 mm WS.

Only on the section of the piercing part 3 on the tobacco rod side, the wrapping paper 8 is provided with ventilation holes 5, which are arranged as one to three, preferably two rows of round holes around the filter 7, while on the filter section 4 on the lip side, the wrapping paper 8 is completely airtight. The ventilation holes 5

-4 air is sucked into the filter 7, which leads to the condensate and nicotine values of the mainstream smoke already present in the section of the filter part 3 on the tobacco rod side, which is fed to it from the tobacco rod 6, being reduced. It is known to the person skilled in the art how the ventilation holes can be produced, for example mechanically or electrostatically or by laser perforation. Other, also known, ventilation designs can be made by means of cannulas or other material designs.

The lip-side filter part 4 forming a coaxial filter has a core 1 and a casing 2 coaxially surrounding the core 1.

The core pressure drop can be between 10-50 mm WS. The casing is designed so that its pressure drop is at least twice that of the core. The casing can also be smoke-tight.

Example:

Design with a 21 mm long filter.

The diameter of core 1 was 4.0 mm and the length was 8.0 mm. The filter was made of cellulose acetate with an individual fineness of 6.0 den and a total fineness of 17,000 den. The suction resistance or pressure drop of core 1 was 20 mmWS.

The casing 2 coaxially surrounding the core 1 had an inner diameter of 4.0 mm and an outer diameter of 7.8 mm, with a length of 8.0 mm. Cellulose acetate was used as the material, with a single denier of 2.1 and a combined denier of 55,000, which led to a pressure drop of 120 mm WS.

Thus, the coaxial filter had an overall diameter of 7.8 mm with a length of 8.0 mm.

In other embodiments, the following values are considered: For the core, an individual fineness of 3.0 to 8.0 den, preferably 6.0 den, and a total fineness of 15,000 to 50,000 den, preferably 17,000 den. For the casing, an individual fineness of 1.5 to 3.0 den, preferably 2.1 den, and a total fineness of 40,000 to 75,000 den, preferably 55,000 den.

-5The individual fineness on the tobacco rod side is 1.5-5 den, and the total fineness is 15,000-60,000 den.

Filter specification _________________ ____________________________ SEED Cover Tobacco rod side filter Material CA CA CA________ Single/total thread specification Denier 6.00y/17000 2.10y/55000 2.50y/35000 Diameter mm 4.0 external 7.8 internal 4.0 7.8 Cross-sectional area A 2mm 12.6 35.2 47.8__________ Cross-sectional area A % 26.4 73.6 100 Length mm 8.0 8.0 ___ 13.0 Pressure drop mmWS 20 120___ 42 Pressure drop ΔΡ % 16.7 83.3 _______ - Flow S S = 100 ΔΡ % 83.3 167 100 Factor S/A 3.2 0.2 1.0_____________

The above example shows that, in contrast to the flow rate in the filter section on the tobacco rod side, an approximately threefold increased flow rate was achieved in the core.

Claims (12)

-6Patent claims 1. A filter cigarette with a tobacco rod having a casing and a filter with ventilation, which consists of two filter parts, characterized in that - the ventilation option is arranged on the tobacco rod side of the filter part (3); - the tobacco rod-side filter part (3) is a one-piece filter part and the lip-side filter part (4) is a coaxial filter part with a core (1) and a cover (2); - where the pressure drop of the core (1) is less than the pressure drop of the casing (2). 2. A ventilated filter cigarette according to claim 1, characterized in that the filter part (3) on the tobacco rod side consists of a sheet-shaped, fibrous, granular or degradable filter material. 3. A ventilated filter cigarette according to claim 2, characterized in that the filler material used is cellulose, cellulose ester, preferably cellulose acetate, meltblown filler material, airlaid filler material, filler material mixable with additives, tobacco, other easily degradable filler materials or thermoplastic filler fibers. 4. A ventilated filter cigarette according to claim 2 or 3, characterized in that the filter material is mixed with an additive. 5. A ventilated filter cigarette according to claim 4, characterized in that the additives used as flavoring agents are acids or bases in suspended or dissolved form, or selectively acting adsorbents such as activated carbon or S1O2. 6. A ventilated filter cigarette according to any one of claims 1-5, characterized in that the core (1) of the lip-side filter part (4) is made of coarse fibrous material. -7- . It consists of, where the fineness value of the individual threads is 3.0 - 8.0 den, the total fineness is in the range of 15000-50000 den. 7. A ventilated filter cigarette according to claim 6, characterized in that the individual fineness value is 6.0 den and the total fineness value is 50,000 den. 8. A ventilated filter cigarette according to any one of claims 1-5, characterized in that the cover (2) of the lip-side coaxial filter part (4) consists of a fibrous material having an individual fineness value of 1.5 - 3.0 den and an overall fineness value of 40,000 - 75,000 den. 9. A ventilated filter cigarette according to claim 8, characterized in that the individual fineness value is 2.1 den and the total fineness value is 55,000 den. 10. A ventilated filter cigarette according to claim 1, characterized in that the ratio of the pressure drop of the core (1) to the pressure drop of the casing (2) is greater than 2. 11. A ventilated filter cigarette according to claim 10, characterized in that the ratio of the pressure drop of the core (1) to the pressure drop of the casing (2) is about 6. 12. A ventilated filter cigarette according to claim 1, characterized in that the surface of the core is encapsulated or formed in an airtight manner. Instead of the notifier, the authorized person: I / f i. , _ Síkos Róbert S / patent attorney DANUBE Patent and Trademark Office Ltd.