FI87131B - Coaxial cigarette - Google Patents

Description

5 87131

Kooksi an! I cigarette coaxialc igare tt

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

10 There are a series of publications relating to so-called "coaxial tobacco articles", i.e. coaxial arcs or cigarettes having an inner core surrounded by a cover layer of tobacco material. The basic principle of such a coaxial cigarette is known, for example from FR patent publication 998 556, in which the inner core 15 consists of cheaper quality tobacco surrounded by an annular, higher quality tobacco cover layer. This achieves savings in the cost of acquiring the tobacco material used.

Other forms of such a coaxial cigarette are disclosed in FR Patent 1,322,254, U.S. Patent 3,614,956, U.S. Patent 4,219,031, GB Application 2,070,409 and GB Patent 10,864,443.

DE-A-2 620 335 discloses a cigarette having an elongate cavity in its tobacco rod portion which is connected to a conventional filter. In one embodiment of DE-A-2 620 335, the apparently normal filter tip comprises parts which are in the longitudinal direction of the filter and prevent the flow of smoke in a direction transverse to the longitudinal direction of the filter. In this way, the air drawn through the second empty part of the pipe rod 30 of the tobacco rod can flow through the filter tip without mixing with the smoke components generated in the tubular tobacco part. However, this function does not cause smoke in both the core and the cover of the tobacco rod part, nor the absorption of these smoke components into the filter.

In another embodiment of the DE application, the tobacco product has a hollow tobacco rod in which the tube extends through both the tobacco rod portion and the filter portion. In order to achieve the required flow resistance, a plug is placed in the filter.

U.S. Patent No. 4,355,995 discloses a type of filter tip that can be attached to a conventional tobacco rod. The particular structure of the filter tip is such that it could be considered "coaxial", but the combination of a coaxial tobacco rod and a coaxial filter is not shown here.

A coaxial cigarette of the given type is known from DE-A-36 02 846 and comprises an inner core of residual free-glowing material, a cover for the inner core, an outer cover layer coaxially surrounding the inner core of tobacco and / or non-tobacco material, and a cover for the outer cover layer. A particular advantage of this coaxial cigarette 15 is that it can be manufactured by conventional manufacturing techniques, especially in a modified rod machine.

However, the disadvantage is that this coaxial cigarette is not equipped with a filter to remove unwanted fumes.

20

Finally, U.S. Pat. No. 3,356,094 discloses 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 expensive and costly; moreover, the different ingredients differ from each other so that an unusual smoke sample is obtained.

The object of the invention is to create a coaxial cigarette of a given type which does not have the above-mentioned drawbacks.

30 In particular, a coaxial cigarette is proposed in which unwanted smoke can be removed almost completely.

This is achieved according to the invention by the features given in the characterizing part of claim 1.

35 3 87131

Suitable embodiments are defined by the features given in the subclaims.

The advantages achieved by the invention are due to the fact that during the suction step 5 of the suction force, the combustion products of the rod part are formed in a circumferential outer cover layer and, separated from the inner core, are directed axially through a coaxial cigarette and absorbed through a special coaxial filter; this coaxial filter treats the smoke flowing through its outer circumference, its filter cover layer and the smoke flowing in the middle, its filter core, in a very distinguishing manner, in a way that adjusts both types of smoke so as to achieve an optimal filter effect.

In particular, the gas phase of the smoke is reduced by diffusion and ventilation, while the particle phase is reduced by ventilation and at the same time sucked through the high-power filter segment.

Both the tobacco rod and the coaxial filter of this coaxial cigarette can be manufactured by the present technique, which is in principle known from the prior art, so that only corresponding modifications are necessary for the respective machine.

The smoke that forms and is taken up by the smoker is tastefully acceptable and contains few condensates that are still free of otherwise conventional combustion products; the smoking process itself is not changed 25 so that the "smoking experience" for the smoker can be maintained.

Here, the fact has been taken advantage of that during the suction phase the combustion products originate essentially only from the "peripheral region", i.e. from the top layer region of the cigarette, so that the corresponding operation 30 directed here can be initiated to remove unwanted smoke products. Moreover, it is now possible to consistently combine with an optimized tobacco press to achieve an optimized double-flow filter, further combining the desired flavor to reduce unwanted smoke.

4 87131

The invention will now be described with reference to an exemplary embodiment shown in more detail in the accompanying schematic drawing, in which one axial sectional pattern through a coaxial cigarette is shown.

A coaxial cigarette, generally designated 10, comprises a rod portion 12 on which a coaxial filter 15 is placed by conventional manufacturing techniques. The rod portion 12 includes an inner core 14 having a cover 16 and an outer cover layer 18 having a cover 20.

Similarly, the coaxial filter 15 consists of a filter core 22 having a cover 24 and a filter housing 26 having a cover 28.

The coaxial filter 15 is ventilated, as will be explained further; the vent means is indicated by a line of point-like vents 30 extending into the circumference of the coaxial filter 15.

The diameter of the inner core 14 of the rod part 12 is 3-5 mm, while the diameter of the outer cover layer 18 of the rod part 12 rises to a maximum of 8 mm so that this rod part 12 corresponds approximately to the normal diameter 20 of a "normal" cigarette.

The inner core 14 consists of a porous carrier having a high receptivity for the combination of flavors and / or spices described in "Casing", which are generally in a solvent and contain sugar, a humectant and the like; there is also talk of "tobacco juice"; this "Casing" is added to the tobacco material before surgery.

The relative "Casing" capacity of the carrier must be greater than 3% by weight.

30

A popular carrier is a tobacco material. Cut tobacco, strip of tobacco or extruded tobacco; however, thermally decomposable non-tobacco material is also an issue. Importantly, the carrier of the inner core 14 glows approximately residue-free.

35 87131 5

The residue formed should be negligible; moreover, it is possible to add glass fiber or other mineral fibers to the carrier of the inner core IA, thus already causing a certain filter effect.

5 If the inner core 14 contains tobacco material, this should have a high aroma content and / or a high condensate potential as well as a low carbon monoxide potential.

The cover 16 of the inner core 14 of the rod part 12 has a porosity of al-10 in a comparable manner. The cover 16 is a special cigarette paper, namely an appropriate cigarette paper consisting at least in part of a tobacco raw material.

Alternatively, the cover 16 of the inner core 14 can also be made of tobacco-15 strip or other strips of natural material.

The outer cover layer 18 of the rod part 12 consists of a tobacco material and / or a non-tobacco material with a low condensate potential and a high density to a packing density of up to 200 mg / ml.

20

As the outer cover 20 of the outer cover layer 18, a porous cigarette paper having an air permeability greater than 30 CU (Coresta Units - cm 3 / min x cm 2 x 100 mm WS) is used.

Importantly, the inner cover 16 of the inner core 14 and the outer cover 20 of the outer cover layer 18 of the rod portion 12 in general act with different glow salts and glow salt concentrations as additives, namely either with similar common surfaces or glow salt patterns; thus, a particular glow salt or chemically several different glow salts may be used.

The amount of glow salt for the inner cover 16 and the outer cover 20 should be adjusted to provide a total glow rate for the inner core 14 and the outer cover layer 18 that is sufficiently constant to ensure a mass change of the inner core 14 and the outer cover layer 18 of the rod portion 12 35.

6 871 31 In particular, it should be noted that higher local glow rates occur in cavities and similar faults.

The tensile strength of the inner core 14 of the rod part 12 should be lower than the tensile strength of the outer cover layer 18 of the tobacco rod 12.

The outer diameter of the coaxial filter 15 corresponds to the outer diameter of the rod part 12, i.e. rising to a maximum of 8 mm.

The diameter of the filter core 22 corresponds approximately to the diameter of the inner core 14 of the rod part, however, according to the referenced embodiment it should be about 0.1 to 1 mm smaller than the latter, marked in this way so as to exclude smoke from the outer cover layer 18 entering the filter core 22.

15

The coaxial cigarette 15 is ventilated and has a ventilation rate of 50-80%.

For this purpose, the cover 28 is provided with high-porosity cover and high-porosity filler paper to which laser-pierced ventilation zones 20 have been added at least through the filler paper. If the ventilation zones, as shown, are formed as circumferential point-shaped ventilation openings 30, then the distance between the lines of the openings 30 and the mouth end of the coaxial filter 15 must be at least 10 mm.

25 The length of the coaxial filter 15 should be in the range 21-30 mm. Correspondingly, the ventilation zones 30 are at least 9 mm away from the end face of the coaxial filter 15 facing the rod part 12, thus keeping the desired minimum distance to the mouth end face.

30

If the distance between the end face of the mouth-side coaxial filter 15 and the ventilation zone 30 is llt the width Δ1 of the ventilation zone 30, the position of the coaxial filter 15 is denoted by 1F: In this case, n 7 871 31 is true

If ‘1-2“ li + Δΐ

As mentioned, the cover 28 of the filter cover layer 26 is porous and consists of cover and filler paper. The porosity of the filler paper shall be 5 more than 5,000 CU and the porosity of the cover paper more than 10,000 CU.

The materials for both filter zones, namely the filter core 22 and the filter cover layer 26, are the conventional filter materials currently used by the cigarette industry.

10

Alternatively, the filter core 22 may be comprised of a porous support material having a large specified top surface, in particular a foamed, extruded, sintered, extruded or molded material such as carbon, tobacco or non-tobacco material. With these alternatives, the filter cover layer 26 further consists of conventional filter materials.

In both alternatives, the carrier material for the filter core 22 must contain additives, namely common additives such as, for example, triacetin, flavors, e.g. flavorings, or taste-neutral substances with a high transfer coefficient in the core smoke.

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

25

The following code numbers can be assigned to both filter zones 22,26:

The ratio of the specific tensile strength of the filter cover layer 26 to the tensile strength of the filter core 30 22 "closed as measured", i.e. without regard to ventilation, is at least 1.4.

The relative smoke flow of the circumferential filter cover layer 26, together through the ventilation vents 30, has a reduction rate of at least 35 to 90%; and the filter core 22 has a relative nuclear smoke filter effect of up to 40%.

8 87131

The described coaxial cigarette 10 thus contains both the inner core 14 of the rod part 12 and the combustion products of the outer cover layer 18. During suction, the combustion products only accumulate in the outer cover layer 18 of the rod part 12, so that almost all combustion products are passed to a separated track, 5 are directed to and through the coaxial filter 15, thus achieving less condensation without affecting taste, which is still free of otherwise combustion products.

Claims (20)

87131 9 1. A coaxial cigarette: a) having an inner core of a broadly residual-free glowing material, in particular a tobacco material, b) having a cover for the inner core, c) having an outer coating surrounding the inner core, an outer cover layer of tobacco and / or non-tobacco material, wherein d) is a cover for the outer cover layer, 10 e) having a ventilated coaxial filter (15), el) having a filter core (22) having an inner diameter approximately equal to the diameter of the inner core (14), and e2) having a filter cover layer (26); and f) having an air permeable cover (24) for the filter core (22); 15 characterized by the following features: g) the filter cover layer (26) has an air-permeable cover (28); h) the cover (16) of the inner core (14) and the cover (20) 20 of the outer cover layer (18) are provided with glow salt; and i) the tensile strength of the inner core (14) is lower than the tensile strength of the outer cover layer (18). Coaxial cigarette according to Claim 1, characterized in that the ventilation of the coaxial filter (15) is 50 to 80%. Coaxial cigarette according to Claim 1 or 2, characterized in that the inner diameter of the filter core (22) is somewhat smaller than the inner diameter of the inner core (14). 30 Coaxial cigarette according to one of Claims 1 to 3, characterized in that the cover (24) of the filter core (22) consists of air-permeable cigarette paper. Coaxial cigarette according to one of Claims 1 to 4, characterized in that the cover (28) of the filter cover layer (26) consists of high-porosity protective paper and high-porosity filling paper with laser-pierced ventilation zones (30) added at least through the filling paper. 5 Coaxial cigarette according to Claim 5, characterized in that the filler paper has a porosity of at least 5000 CU and the cover paper has a porosity of at least 10,000 CU. Coaxial cigarette according to one of Claims 1 to 6, characterized in that the filter core (22) consists of a porous support with a large specified top surface. Coaxial cigarette according to Claim 7, characterized in that a cellular, extruded, sintered, compressed or molded material, such as, for example, carbon, tobacco or non-tobacco material, is used as the carrier. Coaxial cigarette according to one of Claims 1 to 8, characterized in that the filter material of the filter core (22) and / or the filter material of the filter cover layer (26) is provided with additives. Coaxial cigarette according to one of Claims 1 to 9, characterized in that the ratio of the tensile strength of the filter cover layer (26) to the tensile resistance of the filter core (22), excluding ventilation, is at least 1.4. Coaxial cigarette according to one of Claims 1 to 10, characterized in that the filter cover layer (26) has a reduction of at least 90% relative to the peripheral smoke flow together with the ventilation. Coaxial cigarette according to one of Claims 1 to 11, characterized in that the filter core (22) has a filter effect of at most 40% relative to the core smoke. li 87131 11 Coaxial cigarette according to one of Claims 1 to 12, characterized in that the inner core (14) contains a porous carrier which has a high absorption capacity for flavorings and / or flavors or spices. 5 Coaxial cigarette according to Claim 13, characterized in that a tobacco material and / or a thermally decomposable non-tobacco material is used as the carrier. Coaxial cigarette according to Claim 14, characterized in that a tobacco material with a high aroma content and / or a high condensate potential and a low carbon monoxide potential is used. Coaxial cigarette according to one of Claims 1 to 15, characterized in that the cover (16) of the inner core (14) is slightly porous. A coaxial cigarette according to claim 16, characterized in that the cover (16) of the inner core (14) consists of cigarette paper, a tobacco strip or other natural strip. Coaxial cigarette according to Claim 17, characterized in that the cigarette paper contains at least part of a tobacco raw material. 25 Coaxial cigarette according to one of Claims 1 to 18, characterized in that the outer cover layer (18) contains a tobacco material and / or a non-tobacco material with a low condensate potential and a high seal. 30 Coaxial cigarette according to Claims 1 to 19, characterized in that the cover (20) of the outer cover layer (18) consists of porous cigarette paper with an air permeability of more than 30 CU. 35 12 87131