DE1432630A1 - Filter suitable for cigarettes, cigars or filter cartridges - Google Patents

Description

/ Case 4 CH

Pataitanwlttt

. te * F. Weickminn. Or. Ing. 1 fifekminn 1 4 3 2 6 3 C

Dipl. Teg. H. Weickminn, Dipl. Ph s. Dr. K, Finn « M-: ο ..?, Bruriii iOj} 5 u J

Br. Laszlo Egri . Ba ^ eI (Switzerland) Pure cigarettes, cigars or pliter cartridges

suitable pilter

The present invention relates to a for Pilter suitable for cigarettes, cigars or filter cartridges, which is able to absorb the components of tobacco which are harmful to the human body more completely than all previously known filters.

As is well known, Rauoh represents a colloidal system in which solid particles are finely distributed in a gaseous medium. In the case of tobacco smoke has therefore it _t to do with an aerosol in which the K disperglerten solid smoke particles according to Ullmann's Encyclopedia of Industrial Chemistry. 3 edition, 1 volume (1951)> page 368 a

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Particle size of about 0 * 15 / u bia 0.01 / x have ^ Solohe aerosols can be known not to be destroyed by the mere use of adsorbents. "

. Pure purposes of tobacco smoke analysis the principle of Kapillardkondenaation developed * Here in passing ee manages the tobacco smoke through capillary tubes called "festflüseigen" Anteilt of Tabakrauchec _{which the likotinbasen and the term "tar bases ¹¹ summarized by Wenusch, hochkondenaier | Comprising the th compounds and therefore contain the carcinogenic components of tobacco smoke a · dea smoke to be separated quantitatively. In cigar or cigarette filters *

i however, this method cannot be used «because eiah %

on the passage of the breath duroh "in" in aolchts capillary tube-having filters made of sticky tar- M

the, comparatively large fartlkel agglomerate and this creates such a tensile resistance «that a considerable Licher overpressure must be applied to allow the passage of further amounts of breath. Added koaat, da ·· $

Tobacco smoke "from which all festfHiesigen shares, single η echlieeslich certain Aromaetoffe, were removed by such a capillary tube to the smoker does not provide more pleasure, therefore, on the one hand for the practice selective elimination of harmful Rauchbeetandteile desirable, while on the other hand

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substances that give the tobacco products the desired aroma the filter should be able to pass essentially unhindered without increasing the draw resistance,

in order to largely remove the toxic components of tobacco smoke, they are found in tobacco products, especially in Cigarettes, filters of the most varied composition have been installed, which are based on physico-chemical effects, such as adsorption, absorption, ion exchange, macrocondensation, or purely chemical effects such as bonding of the nicotine bases with the help of acidic reacting substances, whereby in practice the adsorption filters in particular have found the most widespread use up to now Zugwideretand as well as the adsorption bsw. It is known that the degree of absorption of such filters depends on the length of the filter and the choice and the porosity of the filter material. It is possible to achieve the harmful effects with a high lengthening of the adsorbing, or absorbing, filter body Keep smoke components back in the filter body to a greater extent. Such long filter bodies, however, have the considerable disadvantage that they are also essential for the Smokers want aromas in fortified Auema Lake remain in the filter body and the draw resistance is increased to such an extent according to the length of the filter body » that smoking is no longer enjoyable ο One was therefore relies on a filter length of at least 11 mm

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apply to a relatively low retention to achieve nicotine and tar content »

The most common type of just inadequate hatred effective nicotine and tar filters consists of cellulose acetate or crepe filters, also activated carbon, bentonite, Silica gel, clay, diatomaceous earth, meerschaum «mineral fibers, Filters containing glass beads, synthetic resin foam and the like,

Furthermore, various multi-part filters have also been proposed for the same purposes; the length of which is also limited for the reasons mentioned above. For example, an adsorbing V-pad was embedded between two layers of viscose sponge, which, however, does not have a filter effect itself, but only serves to compress the cotton swab that causes the retention of harmful substances to the required density, and on one side to penetrate Wadding fibers in the tobacco uni on the other hand to avoid contact of wadding fibers with the lips of the smoker, double filters are also known, which contain a filter part containing activated carbon as an adsorbent and a second filter part, for example made of paper ν glass fibers or the like. Furthermore, filter elements are also known in which the smoke is guided through channels which cause heat exchange and in which the raw material is cooled and brought into contact with an adsorbent material. Such a filter exists

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For example, from a corrugated sheet metal strip in connection with a strip of an adsorbing material, the metal absorbing heat as the smoke passes through and the adjacent filter layer adsorbing or absorbing unwanted smoke components closing exchange or Kühlelemen ^ of a plurality of axially extending smoke passages which, parallel are made of thin metal foils »z, B in the form of = the tubes are formed _s wherein a Adsorp * tion layer in this cooling element ansahliesat i>_ergl?; , America, patent specification BTr. 2.827 ο 903)., But it has shown that a selective separation of the smoke? as it takes place in the capillary condensation principle mentioned at the outset; due to the numerous passages and the resulting large overall cross-section and the simultaneous cooling is not possible »

Austrian patent specification No. 198 172 describes a filter cartridge for elae cigarette holder, which is filled with an adsorbent and one or has several nozzle-like smoke supply channels »which are so narrow that the flow velocity of the smoke when passing through the ducts strongly er = is increased »Due to the increased resistance, a

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such embodiment of the smoking pleasure impaired. In addition, this filter cartridge has an absorption medium layer to * which is a multiple of the length of conventional filter tubes.

Finally, in American Patent No. 2 "954.778, a two-part filter is disclosed, one of which is connected to the tobacco filling filter part in the manner of a Venturi nozzle with a narrow, but conically widening passage is formed at both end parts, this being filtered made of metal or a plastic «, The However, the production of such a cylindrical filter part with conical cylinder ends is extraordinary expensive and for a treadmill resident Manufacture unsuitable, each filter nozzle must be used be injected and pressed as a single piece.

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143,263 €

The filter according to the invention, which can be easily installed in cigars, cigarettes or filter cartridges, is also a multiple filter which has at least one first filter part provided with at least one axial passage for the smoke and at least one second filter part adjoining the first filter part .It part made of absorbent or absorbent, porous material? the first and second filter parts alternating with one another | and the new filter is designed in such a way that the first filter part consists of a hydrophobic material with a surface that is as smooth as possible and of low thermal conductivity and has at least one channel with any cross-sectional shape _p but with a constant transverse surface area over the entire length of each channel, the The cross-sectional area of all existing channels is at least approximately the same as the cross-sectional area of some karsais with a circular diameter of at most 1.8 ram, preferably 0.6-1.5 mm in diameter. ü Particularly good results are obtained with a diameter of 1.0 1.2 mm. In those cases in which the filter part made of hydrophobic material has several channels, the cross-sectional area and shape of the individual channels can either be the same or different from one another. Good results are obtained with a single channel from zE. 1.5 mm in diameter achieved, but several channels, ζ _a B ₀ 2 - 7 channels * can be present.

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The first filter part, which is made of hydrophobic material with the smoothest possible surface and adjoins the tobacco layer, can, for example, be made from glass, porcelain, from plastics such as thermosets, thermoplastics, bakelite, polyvinyl chloride Hard rubber, natural resins, synthetic glass or impregnated with plastics and thereby hydrophobic and with a smooth Surface-provided materials such as cellulose are made.

The length of the first filter part made of hydrophobic material can vary. So can the length of this Part of the filter fluctuates between 1 mm and 8.5 inches. Preferably but it will be 2 to 6 mm depending on the material used « A length of 2 to 4 mm is particularly interesting. It was namely - contrary to the previous view - found that the length of the channel or channels in the first filter part is not must make up a multiple of his or her diameter, but also that much shorter channels have the same good retention, so that with the filter not only an increased economic efficiency, but also a substantial reduction in the pulling resistance can be achieved can. With a filter length that is customary today, that is to say with normal tensile resistance, one obtains with the one according to the invention Filters have increased tar-nicotine retention compared to conventional filters.

It was also found on the basis of various experiments that the filter according to the invention

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succeeds in selectively and largely removing the raw components considered harmful to health, the aroma of the tobacco smoke being better preserved than with the previously known filters.

The first filter part made of hydrophobic material with The smoothest possible surface of one component of the invention Filters can be easily produced in large series, for example by using the extrusion process or, in any other suitable manner, a continuous strand provided with the necessary channels manufactures and cuts off the latter filter pieces of the desired size. Oa the length of the hydrophobic first filter part shorter than before, it is usually also possible to increase the total length of the filter Shorten, the filter can be cut to the usual length of a Filter cigarettes with the same tobacco consumption can be designed as a so-called Rezessfliter.

The second filter portion consists of the usual filter media! S with a porous surface, such as ₃ crepe paper, cotton, acetate.

The filter can also be designed in such a way that a plurality of first and second filter parts alternate with one another the number of which is only limited by the length of the filter.

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143263G

The effectiveness of the filter according to the invention is clearly visible when the filter is taken apart after smoking the cigarette. At the point where the second filter part made of porous material meets the first filter part made of hydrophobic material, shows a limited, strong brown colored area, while depending on the length of the filter, the end facing the smoker's mouth of the second filter part made of porous material no longer has any discoloration worth mentioning. In contrast to this they are hitherto known filters practically throughout yellow, which shows that the filters currently available are not sufficient for the Smokers can be achieved.

Tests have also shown that, compared to a normal acetate filter of 17 mm length, the filter according to the invention is able to hold back about 30 to 60 % more tar and nicotine components in the smoke, while the tobacco aroma that the smoker is dearly desired is retained as far as possible. It has also been shown that by shortening the second filter part made of porous material, the surprisingly high effectiveness of the first filter part made of hydrophobic material can easily be achieved

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1A32630

is, a noon more effective passage of flavorings can be achieved.

The accompanying drawing shows a conventional filter cigarette and three embodiments of a cigarette, which are equipped with a filter according to the invention. The cigarettes are each shown in section. Same parts are denoted by the same numbers.

Flg. 1 shows a conventional filter cigarette with a filter 1 and the tobacco filling 2 _e

Flg. 2 shows a cigarette with one according to the invention Filter, which consists of a first filter part 3 * the with a Channel 4 is provided 1st and consists of a second filter part 1.

Fig. 3 shows another embodiment of a cigarette with a filter according to the invention, in which the second filter part 1 has a recess at the opening point of the channel 4 5 has.

Fig. 4 shows another embodiment of a Cigarette with a filter according to the invention, in which the first filter part 3 has several channels 4 »

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Claims (1)

Patent claims I) Filter suitable for purely cigars, cigarettes or filter cartridges, characterized in that it consists of at least S parts, namely at least one first filter part provided with at least one axial passage for the smoke and at least one second filter part made of absorbent or adsorbent which attaches to the first filter part ,, porous material consists of _B where the first and second Fil-tertelie alternately follow one another and the first filter part consists of a hydrophobic material with the smoothest possible surface and of low thermal conductivity and at least one channel with any cross-sectional shape, but with one over the entire length of each channel has a constant cross-sectional area, the cross-sectional area of all existing channels being at least approximately equal to the cross-sectional area of a single channel with a circular cross-section of at most 1.8 mm in diameter S) Filter according to Claim 1, characterized in that that the first person filtered clears at least two channels « 3) Filter according to a ^ m of claims i and 'd _e, characterized in that the first filter part mlndeatims swei Canals contain their cross-sectional surface and shape with one another can be different » 809813 / $ 003 4) filter according to one of claims 1 and S, characterized in that the first filter part made of glass, porcelain, made of plastics, such as thermosets, thermoplastics, bakelite, polyvinyl chloride ^ ₁ made of hard rubber, natural resins, synthetic glass or impregnated with plastics and thereby hydrophobic and materials such as cellulose that have a smooth surface « 5) filter according to one; which claims ϊ - 3 * dad & reh f that the cross-sectional area ** of the channel or the total cross-sectional area of the channels in the first part of the piping form the cross-sectional area of a channel with a circular cross-section of 0 * 6 to 1.5, mm, preferably toü l _ä , 0 - i "3 me;" Diameter is 6) Remove na.-ch is one of Claims * 1-4, characterized in that the total length _e of the filter höshstens gleieh i3 "r usual length of a normal filter and the first filter part the same length or shorter Is ^T u than the sweifc «· ™ filter part ο Naeh claim 6 "wherein gekennzeieh-η" t _s that the first filter part "includes 7) Filter ine Läng © 1 to 8.5 mi _s, preferably 2 to 6 mm and preferably 2 to 4 mm. '8) Filter naoh one »of claims 1-4 ,, because that the second. Filtered a recess, preferably a conical or spherical one, at the intersection of the canal or the canals in the second filter part Has recess. ' _BAD ^^ JJ Dr, t-ö.f.üo Egri