DK172979B1 - Coaxial cigarette - Google Patents

Description

and DK 172979 B1

The present invention relates to a coaxial cigarette of the type stated in the preamble of claim 1.

There are a number of publications concerning so-called "coaxial smoking articles", in particular coaxial cigars or 5 cigarettes with an inner core surrounded by a mantle of tobacco material. The basic principle of such a coaxial cigarette is known, for example, from French Patent Specification No. 998,556, in which the inner core consists of a lower quality tobacco, which core is surrounded by an annular sheath of higher quality tobacco. Thereby, savings can be obtained with respect to the cost of the tobacco materials used.

Other designs of such coaxial cigarettes are disclosed in French Patent Nos. 1,322,254, U.S. Patent Nos. 3,614,956 and 4,219,031, British Patent Nos. 20,70,409 and 10,86,443.

A coaxial cigarette of the type indicated is known from German Offenlegungsschrift No. 36 02 846 and has an inner core of a substantially axis-free, glowable material, a wrapping of the inner core, an inner core coaxially surrounding the outer shell of a tobacco and / or or non-tobacco material, as well as a wrap for the outer sheath. The particular advantage of this coaxial cigarette is that it can be manufactured using conventional manufacturing techniques on specially modified string machines.

However, it is a disadvantage that this coaxial cigarette is not provided with a filter that can catch unwanted smoke constituents.

Finally, U.S. Patent No. 3,356,094 relates to a coaxial cigarette having an inner hollow tube and an aerosol chamber with a narrow outlet. However, the manufacture of this coaxial cigarette is very cumbersome and thus expensive, and furthermore the various components are separated from each other so that an unusual smoke pattern is obtained.

Finally, DE-A-26 20 335 discloses a coaxial cylinder having a string part with an inner core and an outer sheath. At the mouth end, a filter part is attached to this known coaxial cigarette on the string part, in which 2 DK 172979 B1 partitions are inserted. The inner space, which by means of the partitions is enclosed in the filter part, is located in connection with the inner core, but is nevertheless further connected to the outer casing. The outer sheath is filled with a tobacco material, while the inner core of the known cigarette is hollow. More specifically, this known coaxial cigarette was to solve the problem of reducing the condensate content, but above all, with this known coaxial cigarette the taste intensity was reduced in such a way that a smoker would return to the regular cigarettes after a short time. Furthermore, the undesirable smoke constituents of the mentioned coaxial cigarette were simply diluted, whereby at the same time the taste experience of the smoker was also affected.

The object underlying the invention is to provide a coaxial cigarette of the kind mentioned in the introduction and by which the undesirable smoke constituents can be captured almost completely.

In particular, a coaxial cigarette must be proposed in which the undesirable smoke constituents can be captured almost completely.

This is achieved according to the invention in that the coaxial alcohol cigarette is characterized by what is stated in the characterizing part of claim 1.

Suitable embodiments are defined by means of the particular features set forth in the subclaims.

The advantages obtained by the invention are due to the fact that combustion products arising during suction in the suction phase in the string part of the annular outer casing separated from the inner core are passed axially through the coaxial cigarette and absorbed in a special coaxial filter which treats the peripheral filter casing smoke and the central, its filter core flowing smoke in a very different way, which is matched to the two types of smoke, so that an optimal filter effect is achieved. In particular, the gas phase of the smoke is reduced through diffusion and ventilation, while the particle phase is reduced by ventilation and at the same time absorbed through a filter segment with high power.

Both the tobacco string and the coaxial filter in this coaxial cigarette can be manufactured with the existing technologies known in accordance with the prior art, so that only a corresponding modification is required on the existing machines.

The smoke produced and captured by the smoker is taste-acceptable and contains only small amounts of condensate, and is further largely free of the otherwise common combustion products, as the smoking process itself does not change, so that the "smoking experience" is maintained for smoking-10 clean.

In addition, the fact is utilized that the combustion products during the suction phase essentially only originate from the circumference, ie. the mantle area of a cigarette, so that corresponding measures can be purposefully initiated here to catch the undesired smoke products. Furthermore, an optimized tobacco string can now be consistently combined with an optimized two-B string filter to achieve the desired taste in connection with a far-reaching reduction of the undesired smoke constituents.

The invention will be described in more detail below with the aid of exemplary embodiments with reference to the accompanying schematic drawing, the individual figure of which shows an axial section through a coaxial cigarette.

The coaxial cigarette, generally indicated by the reference numeral 10, has a string part 12, on which a coaxial filter 15 is fitted with 25 conventional manufacturing techniques.

The string portion 12 includes an inner core 14 with a wrap 16 and an outer core 18 with a wrap 20. Similarly, the coaxial filter 15 consists of a filter core 22 with a wrap 24 and a filter sheath 26 with a wrap 28.

The coaxial filter 15 is ventilated as will be explained below, the ventilation means being indicated as a line of point-shaped ventilation openings 30 extending over the circumference of the coaxial filter 15.

The inner core 14 of the string portion 12 has a diameter of from 3 to 5 mm, while the diameter of the outer sheath 18 of the string portion 12 is at most 8 mm, so that this string portion 12 roughly corresponds to the usual diameter of "normal" cigarettes.

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The inner core 14 consists of a porous carrier substance with a high absorption capacity for the combination of aromas and / or flavoring substances, also referred to as "casing", which are generally present in solvents and contain sugars, moisture preservatives and similar substances which are also referred to as about a "sauce"; this "casing" is added to the tobacco material before slicing.

• In relation to the carrier substance, the absorption capacity of the casing must be greater than 3% by weight of additive.

A preferred carrier substance is tobacco material, for example cut tobacco, tobacco foil or extruded tobacco; however, thermally decomposable, non-tobacco materials may also be considered. It is important that the carrier substance in the inner core 14 is largely able to glow without ash.

The resulting ash residues must be insignificant, and there is therefore the possibility of adding 14 carrier fibers or other mineral fibers to the carrier substance in the inner core, in order to achieve a certain filter effect already here.

In the case where the inner core 14 contains two baking materials, this must have a high aroma content and / or a high condensate potential, as well as a low carbon monoxide potential.

The envelope 16 of the inner core 14 of the strand portion 12 has a relatively low porosity. Suitable wrappers 16 are, in particular, cigarette paper, and more particularly a cigarette paper which consists at least in part of tobacco raw material.

Alternatively, the wrap 16 of the inner core 14 may also be made of tobacco foils or other natural foil 30s.

The outer sheath 18 of the string part 12 consists of tobacco materials and / or non-tobacco materials with low condensate potential and with high filling capacity with a fit density of not more than 220 mg / ml.

As the outer envelope 20 of the outer shell, a porous cigarette paper with an air permeability greater than 30 CU (Coresta Units = cm / min. X cm x 100 mm WS) is used.

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It is important that the inner wrap 16 of the inner core 14 and the outer wrap 20 of the outer sheath of the strand portion be added to common, different glow salts and glow salt concentrations as additives and more specifically either uniformly over the entire surface or as an incandescent salt. pattern, using a particular incandescent salt or a mixture of several different incandescent salts.

The amount of annealing salt for the inner envelope 16 and the outer envelope 20, respectively, must be adjusted so that a total of 10 for the inner core 14 and the outer sheath 18 is obtained, which ensures a sufficiently uniform mass conversion for the inner core 14 and the outer sheath 18 for the string portion 12. in particular, it must be ruled out that cavities or similar defects occur due to local high glow velocity.

The tensile resistance in the inner core 14 of the string part 12 must be lower than the tensile resistance in the outer sheath 18 of the tobacco string 12.

The outer diameter of the coaxial filter 15 corresponds to the y-diameter of the string part 12, i.e. is a maximum of 8 mm.

The diameter of the filter core 22 corresponds approximately to the diameter of the inner core 14 of the string part, but according to a preferred embodiment it must be approx. 0.1 to 1 mm smaller than this, as indicated in the drawing, in order in this way to exclude that the smoke from the outer casing 18 can reach into the filter core 22.

The coaxial filter 15 is ventilated and has a degree of ventilation of from 50 - 80%.

For this purpose, a highly porous wrapping paper and a highly porous coating paper 30 are used as the outer wrapping 28 with a further, laser-perforated ventilation zone 30 inserted at least through the coating paper. If the ventilation zone is formed as shown by means of a circumferentially extending line of point-shaped ventilation openings 30, the line of openings 30 must have a distance of at least 10 mm from the mouth end of the coaxial filter 15.

The length of the coaxial filter 15 must be in the range from 21 - 30 mm. Correspondingly, the ventilation zone 30 in the 6 DK 172979 B1 will be at least 9 mm from the end face of the coaxial filter 15 facing the string part 12, the aim being to keep a small distance to the mouth end face if possible.

When the distance between the end face at the mouth side of the coaxial filter 15 and the ventilation zone 30 is denoted by 1, the width of the ventilation zone 30 by 1, the length of the coaxial filter 15 by 1p and the distance between the ventilation zone and the end face of the coaxial filter 15 is denoted by 12, the following 10 lp - 12 “^ i + i applies.

As mentioned, the wrap 28 of the filter sheath 26 is porous and consists of a wrap and a coating paper. The coating paper must have a porosity of more than 5000 CU and the wrapping paper a porosity of more than 10000 cu.

As materials for the two filter zones, namely for the filter core 22 and the filter sheath 26, the usual filter materials come into play, as they are currently used in the cigarette industry.

As an alternative to this, the filter core 22 may consist of porous carrier materials with a large specific surface, in particular foamed, extruded, sintered, pressed or otherwise shaped material, such as carbon, tobacco or non-tobacco materials. In these variants, the filter jacket 26 still consists of the usual filter materials.

In both variants, the carrier materials for the filter core 22 must contain additives, namely, firstly, the common additives, such as, for example, triacetin, flavor or aroma substances and / or largely neutral substances with high transfer coefficients in the core smoke.

The filter core 22 is surrounded by an air-permeable wrap 24, which for example consists of non-porous filter paper.

For the two filter zones 22,26 the following 35 data can be specified:

The ratio of the specific tensile resistances through the filter material 26 to the filter core 22 by "closed measurement", i.e. without regard to ventilation, at least 1.4.

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On the basis of the peripheral smoke flow together with the ventilation via the ventilation openings 30, the peripheral filter jacket 26 has a degree of reduction of at least 90%, and the filter core 22 has a filter activity of at most 5 40% on the basis of the core smoke.

In the case of the coaxial cigarette 10 described, combustion products thus occur both in the inner core 14 and in the outer casing 18 of the string part 12. During a suction, the combustion products originate essentially only from the outer casing 10 18 of the string part 12, so that almost all combustion products in separate paths are passed through the coaxial filter and thereby can be intentionally actuated in such a way that without affecting the taste, only small amounts of condensate occur, which are largely free of the otherwise common combustion products.

Claims (20)

Coaxial cigarette 5 (a) with an inner core of a largely residue-free, glowable material, in particular a tobacco material, (ib) with an envelope of the inner core, c) with an outer shell surrounding the inner core and its envelope, respectively, of a tobacco and or non-tobacco material, and with d) an envelope of the outer sheath with e) a ventilated coaxial filter (15) with el) a filter core (22) whose inner diameter 15 approximately corresponds to the diameter of the inner core (14), and with e2) a filter jacket (26), f) wherein the filter core (22) has an air-permeable envelope (24), characterized in that g) the filter jacket has an air-permeable envelope (28), 25 h) the envelope (16) of the inner core (14) and the envelope (20) of the outer sheath (18) is provided with glow salts, and i) the tensile resistance of the inner core (14) is lower than the tensile resistance of the outer sheath (18). The coaxial cigarette according to claim 1, 30, characterized in that the ventilation of the coaxial filter (15) is 50 to 80%. The coaxial cigarette according to claim 1 or 2, characterized in that the diameter of the filter core (22) is somewhat smaller than the diameter of the inner core (14). Coaxial cigarette according to Claim 1, 2 or 3, characterized in that the envelope (24) of the filter core (22) consists of an air-impermeable cigarette paper. DK 172979 B1 Coaxial cigarette according to any one of claims 1 to 4, characterized in that the envelope (28) of the filter sheath (26) consists of a highly porous enveloping paper and a highly porous coating paper with a further laser perforated ventilation zone (30) which at least goes through the coating paper. The coaxial cigarette according to claim 5, characterized in that the porosity of the coating paper is at least 5000 CU and the porosity of the wrapping paper is at least 10000 CU. The coaxial cigarette according to any one of claims 1 to 6, characterized in that the filter core (22) consists of 15 porous carrier materials with a large specific surface area. Coaxial cigarette according to Claim 7, characterized in that foamed, extruded, sintered, pressed or shaped materials such as e.g. coal, tobacco or non-tobacco 20 materials. Coaxial cigarette according to one of Claims 1 to 8, characterized in that additives are added to the filter material in the filter core (22) and / or the filter jacket (26). The coaxial cigarette according to any one of claims 1 to 9, characterized in that the ratio of the specific draft resistance of the filter sheath (26) to the filter core (22) without regard to the ventilation is at least 1.4. Coaxial cigarette according to one of Claims 1 to 10, characterized in that the filter jacket (26) has a degree of reduction of at least 90% relative to the peripheral smoke flow together with the provided ventilation. Coaxial cigarette according to one of Claims 1 to 1, characterized in that the filter core (22) has a filter activity of at most 40% relative to the core smoke. Coaxial cigarette according to any one of claims 1 to 12, characterized in that the inner core (14) contains a porous carrier substance with a high absorption capacity for aromas and / or flavor substances. Coaxial cigarette according to Claim 13, characterized in that a tobacco material and / or a thermally decomposable non-tobacco material is used as carrier substance. Coaxial cigarette according to Claim 14, characterized in that a tobacco material with a high aroma content and / or high condensate potential as well as low carbon monoxide potential is used. Coaxial cigarette according to any one of claims 1 to 15, characterized in that the envelope (16) of the inner core (16) is slightly porous. The coaxial cigarette according to claim 16, 20, characterized in that the envelope (16) of the inner core (14) consists of cigarette paper, tobacco foil or other natural foil. The coaxial cigarette according to claim 17, characterized in that the cigarette paper at least partially contains tobacco raw materials. The coaxial cigarette according to any one of claims 1 to 18, characterized in that the outer shell (18) contains tobacco materials and / or non-tobacco materials with low condensate potential and with high filling capacity. The coaxial cigarette according to any one of claims 1 to 19, characterized in that the envelope (20) of the outer casing (18) consists of porous cigarette paper with an air permeability of more than 30 CU. I!