FI63167B - TOBAKSPRODUKT I VILKEN DEN AV I FILTRET INGAOENDE AKTIVKOL FOERORSAKADE OBEHAGLIGA SMAKEN KAN MINSKAS - Google Patents

Description

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Patents and registries ... ......., .........., Λ „_ * (44) Date of first issue. - 31.01.83

Patent- och registerstyreiten '1 Awtktn uthgd odi utUkiiiUw pJSicufd J 2 (32) (33) (31) tsuoikuOT- ^ ugird frtortm 18.12.75

England-England (GB) 51922/75 (71) British-American Tobacco Company Limited, Westminster House, 7, MUlbaak, London, S.W.I., England-England (GB) (72) Fred Haslam, London, Henry George Horsewell, London,

John Anthony Luke, London, David Edward Conway, London,

Engl anti-England (GB) (7 ^) Leitzinger Oy (54) Tobacco product in which the unpleasant taste caused by the activated carbon contained in the filter can be reduced - Tobaksprodukt, i vilken den av i filtret ingäende aktivkol förorsakade obehagliga smaken kan minskas

The invention relates to a tobacco product in which the unpleasant taste caused by the activated carbon contained in the filter can be reduced, and in which the fibrous and activated carbon filter is attached to the tobacco rod by a coating strip surrounding the filter. which dilutes the smoke by at least 20%.

There are two general types of tobacco smoke filters, one of which removes the particulate phase of the smoke mechanically and the other of which reduces the volatile constituents of the smoke by adsorption on a suitable surface or by a chemical reaction.

Filters are also known which reduce both the particulate phase and the volatile phase to some extent. Such are, for example, filters containing adsorbents. If these filters contain an adsorbent, for example activated carbon, that substance has a -f. . 4 · '2 63167 usually detrimental effect on taste. A filter that reduces volatile powders and does not have a detrimental effect on the taste of tobacco smoke is disclosed in our Finnish patent publication 56 616. This result is obtained by substantially preventing the smoke particles from contacting the carbon.

U.S. Patent No. 2,988,088 discloses a tobacco product having a plurality of holes arranged in the wrapping paper in the region of the tobacco rod. However, the first flow of air into the tobacco rod causes turbulence in the smoke flow even before the flow is directed to the filter section. The publication also discloses a product in which the ring formed by the holes is placed in the open space of the nozzle part and a product in which air can be directed to the filter part. In all three of these cases, the purpose of the holes is to limit the pressure drop, to compensate for the flow resistance caused by the filter. The solution presented in this patent publication in all cases is that in order to compensate for said pressure drop, it is completely irrelevant where the air is directed to the product and how large this air volume is. Thus, there is no guidance in this publication as to how these holes could be used for any purpose other than the above.

It is an object of the present invention to provide a tobacco preparation, in particular a filter cigarette, which gives the smoker only a few volatile ingredients as well as particulate ingredients and which tastes good.

The tobacco product according to the invention is characterized in that the filter is a fluffy material in the form of fibers or filaments, in particular cellulose acetate in which activated carbon is dispersed, that air flows into the filter material downstream of the filter end - 86% of the suction volume.

The strip may be a porous paper having a total porosity of between 1000 and 15000 cm 3 min "1 · (lOcrnWG)" 1 (10 cm 2) "1 (Wiggings Teape porosity method).

3 63167

The strip may also be made of a substantially non-porous material provided with perforations, preferably electrostatically formed perforations, which allow air to flow in.

In one embodiment, the strip is provided with one or more perforating rings surrounding the filter and spaced from the end adjacent to the tobacco rod.

The perforating ring or the first such ring is preferably spaced at least 2 mm from the end of the tobacco rod. In this case, a total ventilation range of 0.1 to 7 mm2 per filter is suitably provided.

Since the perforation hole ring is placed slightly away from the tobacco material list, the filter material is initially utilized completely with respect to the total particulate matter. This also prevents the vortex that would occur if air were drawn into the junction of the tobacco material and the filter. In addition, because the inflow of air takes place through the filter material, better and more even control and monitoring of the smoke path is achieved. This also applies to the products according to the invention in which the filter wrapping tape is of porous paper. In general, the decrease in airway pressure is greater near the tobacco head and smaller near the mouth end. For this reason, the inflow of air is more effective closer to the end of the mouth.

The rod formed by the tobacco material, hereinafter referred to as the tobacco rod, is generally composed of natural tobacco or remixed tobacco, but if necessary, the rod may contain or consist of a tobacco substitute.

The carbon can be placed in the filter material, the latter being in tow form, in a known manner with a vibration applicator. The filter may suitably contain 10 to 50 mg of carbon.

When a cigarette is burned through such a filter, the flow conditions are such that the inflow of air forces the smoke filter 63167 towards the central longitudinal axis, with the smoke itself contacting only a small fraction of the carbon particles present, namely only those particles in the center of the filter. For this reason, the unpleasant taste normally caused by carbon is reduced. However, at the same time, the volatile constituents of the smoke are dispersed towards the carbon particles outside the central region in the filter material, to which they are adsorbed, thereby reducing the throughput of the volatile constituents. In addition, because tobacco smoke is forced to pass through the central region at a higher rate, the smoke particles contact the carbon there less, which also contributes to the improvement of taste.

The diameter of the smoke path passing through the central region is controlled by the porosity of the coating paper or the size, number and location of the perforations, including the distance of the perforations from the tobacco end. In general, the central trajectory of the smoke in the filter decreases from a diameter at the end of the tobacco equal to or smaller than the diameter of the filter to a smaller diameter at the mouth end, the latter generally being in the range of 1-4 mm.

The following examples illustrate an embodiment of the invention with reference to Figures 1-4 of the accompanying schematic drawings, each of which shows in axial section a cigarette to which a filter is attached.

Example 1

In Figure 1, the filter consists of a 15 mm long rod portion 1 of self-binding, unwrapped cellulose acetate containing 70 mg of carbon granules activated for gas adsorption and having a rod portion tissue loop size of 12-30 (British Standard Specification). The granules are evenly dispersed throughout the cellulose acetate volatile material into the filter. The filter was attached to the tobacco part 2 of the cigarette with a strip 3 of naturally porous lining paper having a porosity of 10,000 cm 2 / min “1 (10 cm 2)” 1 (10 cm 3) 2, which gave an air inflow of 3 3 cm per 35 cm 3. cm suction, i.e. about 77% of the suction volume that flowed through the coating strip into the filter. Tape 3 extended over the cigarette wrapping paper and was glued to it. When the cigarette was burned through the filter under standard conditions, i.e. 1 suction of 2 seconds and a volume of 35 cm per minute, the filtration efficiency with respect to aldehydes was found to be 45%. It was found that the air flowing in through the strip 3 directed the smoke towards the center of the filter. When halving the filter, the actual smoke path was indicated by the staining of the cellulose acetate, as shown schematically in the figure, by a lattice shading 4. The diameter of the smoke path was about 2 mm from the mouth end. A panel of accustomed smokers tested these cigarettes and found that they tasted better compared to cigarettes with the same filter but wrapped in the usual way.

Example 2

The carbon dispersion filter formed in the cellulose acetate portion 1 of Example 1 was attached to the tobacco rod 2 as shown in Fig. 2 by a strip 5 of substantially non-porous coating paper provided with electrostatic perforations over its entire area, again providing an inflow of air 27. cm per imaisu. When the cigarette was burned through this filter, the filtration efficiency with respect to aldehydes was again 45%.

The diameter of the smoke path 4 was' 2 mm from the mouth end. The improvement in taste was again clear.

Example 3

The filter according to Example 1 was attached to the tobacco rod 2 according to Fig. 1 with an inherently porous paper coating tape 3 having a porosity of 100 cm -1 min 1 (10 cm -1) 1 (10 cmWG) 1. i.e. 28.5% of the suction volume. When the cigarette was burned through this filter, the filtration efficiency with respect to aldehydes was found to be 55%. The smoke was again found to be directed towards the center of the filter, with the diameter of the smoke path 4 in this case being 7 mm at the center of the filter and 4 mm at the mouth end. These cigarettes were also better than their relatives.

6

Example 4 631 67 Again, the filter 1 of Example 1 was attached to the tobacco rod 2 as in Figure 2 with a coating tape 5 of substantially non-porous coating paper with electrostatically formed perforations to give a porosity of 10,000 and an air inflow of 25 cm per suction, i.e. about 71 by volume. The filtration efficiency was found to be 88% for aldehydes. The diameter of the smoke path 4 was 3 mm in the middle part of the filter and 2 mm at the mouth end. The taste had improved.

Example 5

A similar filter was attached to the tobacco rod 2 as shown in Figure 1 by an inherently porous paper web 3 having a porosity of 10,000 and giving an air inflow of 25 cm 2 per aspiration, i.e. about 71% of the aspiration volume. The filtration efficiency with respect to aldehydes was again 88%. The diameter of the smoke path 4 was 3.5 mm at the center of the filter and 2.0 mm at the mouth end. The taste was better than usual again.

Example 6

A similar filter 1 was attached to the tobacco rod 2 as shown in Figure 2 by a coating strip 5 provided with electrostatic-induced perforations with a porosity of 1000 and an air 3 inflow of 8 cm per aspiration, i.e. about 23% of the aspiration volume. The filtration efficiency with respect to aldehydes was 55%. The diameter of the smoke path 4 was 7 mm in the middle part of the filter and 4 mm at the mouth end. The taste was found to have improved.

Example 7

A similar filter 1 was attached to the cigarette by a coating tape 6, around the circumference of which one ring formed by 32 ventilation holes 7 was arranged, the holes being 0.25 x 0.25 mm in size. This is shown in Figure 3. This ring formed by the holes was arranged at a distance α of 2 mm from the end of the filter 1. The inlet flow was 26 cm per aspiration, i.e. about 74% of the volume of expression. The filtration efficiency with aldehydes was 80%. The diameter of the smoke path, • t, 1 f · ί * i Γ 7 63167, the shape of which was substantially as shown in Fig. 3 by reference number 8, decreased from the tobacco-side end to 3 mm. At approximately the center and mouth end of the filter, the diameter was about 2 mm. The taste was again better than in cigarettes with conventional filters.

Example 8

A similar filter 1 was attached to the tobacco rod 2 by a cover strip 9, the circumference of which was provided with two rings, each of which had 32 holes 7, 7 ', as shown in Fig. 4. The size of the holes was 0.25 x 0.25 mm, giving an air inflow of 28 cm 3 per aspiration, i.e. about 80% of the aspiration volume. The ring formed by the holes 7 was placed in the same way as in Fig. 3 and the holes 7 'were placed at an additional distance b of 3 mm. The filtration efficiency for aldehydes was 90%. The diameter of the smoke path was 4 mm at the tobacco end in the vicinity of the tires and approximately 1.5 mm at the middle of the filter and at the mouth end. The improvement in taste was again clear.

Several rings formed by holes can be arranged. In any case, the first ring formed by the holes 7 should be at least 2 mm away from the end adjacent to the filter 1 and the subsequent rings should be placed at least 0.5 mm away from the previous ring.

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Claims (6)

1. Tobacco product in which the unpleasant taste of the activated carbon contained in the filter can be reduced, and which of the filter material (1) consisting of fiber material and activated carbon is connected to the tobacco rod (2) with a filter wrapping band (3, 5, 6, 9). ) having an air-permeable area (3, 5, 7, 7 ') which, when smoke is drawn to the filter from the tobacco rod, allows the flow of air into the filter, which dilutes the smoke by at least 20%, characterized in that the filter (1) is of flock material such as fibers or filaments, especially cellulose acetate, in which the activated carbon is dispersed, that the air streams to the filter material in the flow direction from the end facing the tobacco rod (2) and that of the wrapping band (3, 5, 6, 9). transmitted air flow is 23 - 86% of the volume of suction. Product according to claim 1, characterized in that the strip is made of porous paper, whose air porosity is in the range 1000 - 15000 cm 2 min (10 cm 2 W) (10 cm 2) -1. Product according to Claim 1, characterized in that the strip is made of substantially non-porous material provided with perforations, preferably with electrostatically formed perforations, which allow the inflow of air. 4. Product according to claim 1, characterized in that the strip is provided with one or more perforation rings which surround the filter and are spaced from the end adjacent to the tobacco rod. 5. Product according to claim 4, characterized in that the perforation ring, or the first of two or more such rings, is at least 2 mm apart from the said end of the tobacco rod. Product according to claims 1-5, characterized in that the filter contains 10 - 150 mg of carbon particles which are evenly distributed through the fiber or filament material.