EP0378788A1 - Coaxial filter cigarette - Google Patents

Coaxial filter cigarette Download PDF

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Publication number
EP0378788A1
EP0378788A1 EP89121849A EP89121849A EP0378788A1 EP 0378788 A1 EP0378788 A1 EP 0378788A1 EP 89121849 A EP89121849 A EP 89121849A EP 89121849 A EP89121849 A EP 89121849A EP 0378788 A1 EP0378788 A1 EP 0378788A1
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EP
European Patent Office
Prior art keywords
filter
inner core
strand
coaxial
cigarette according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP89121849A
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German (de)
French (fr)
Other versions
EP0378788B1 (en
Inventor
Werner Dr. Dipl.-Phys. Schneider
Horst Borowski
Erwin Dr. Dipl.-Chem. Kausch
Rolf Kütting
Meinhard Dipl.-Ing. Meyer
Knut Dipl.-Ing. Möller
Bernd-Henrik Dr. Dipl.-Phys. Müller
Erhard Dr. Dipl.-Ing. Rittershaus
Gert Dr. Dipl.-Chem. Rudolph
Adolf Dr. Dipl.-Ing. Schlüter
Wolfgang Dr. Dipl.-Phys. Wiethaup
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British American Tobacco Germany GmbH
Original Assignee
BAT Cigarettenfabriken GmbH
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Publication date
Application filed by BAT Cigarettenfabriken GmbH filed Critical BAT Cigarettenfabriken GmbH
Priority to AT89121849T priority Critical patent/ATE96288T1/en
Publication of EP0378788A1 publication Critical patent/EP0378788A1/en
Application granted granted Critical
Publication of EP0378788B1 publication Critical patent/EP0378788B1/en
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    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D1/00—Cigars; Cigarettes
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
    • A24D3/04—Tobacco smoke filters characterised by their shape or structure

Definitions

  • the invention relates to a coaxial filter cigarette of the type specified in the preamble of claim 1.
  • coaxial smokable articles in particular coaxial cigars or cigarettes with an inner core which is surrounded by a jacket made of tobacco material.
  • the basic principle of such a coaxial cigarette is known for example from FR-PS 998 556, the inner core consisting of a tobacco of lower quality, which is surrounded by an annular jacket made of tobacco of high quality. This allows savings to be made in terms of the cost of the tobacco materials used.
  • a coaxial filter cigarette of the type specified is finally known from the older patent application P 37 43 597.3-23 from December 22, 1987 and has a strand part and a filter part; the strand part contains an inner core made of a largely residue-free smoldering material, in particular tobacco material, a covering for the inner core, an outer casing made of a tobacco and / or non-tobacco material coaxially surrounding the inner core or its casing, and a casing for the outer casing.
  • the filter part has a filter core, an air-impermeable covering for the filter core, a filter jacket and a covering for the filter jacket.
  • the basic principle of this coaxial filter cigarette is that two areas are distinguished in the radial direction, namely the zone of the main heat source on the one hand and the zone in which the major part of the aerosol entering the smoker's mouth is generated.
  • the heat generation zone is in the outer jacket and the aerosol generation zone is in the inner core of the strand part.
  • the invention is therefore based on the object of providing a coaxial filter cigarette of the type specified, in which the disadvantages mentioned above do not occur.
  • a coaxial filter cigarette is to be proposed, the smoke that enters the smoker's mouth has a high proportion of taste-relevant components and a very low proportion of undesirable combustion products; At the same time, the secondary smoke on the one hand and the inflammation potential on the other hand are to be reduced in comparison with conventional cigarettes.
  • the advantages achieved with the invention are based on the fact that in a coaxial strand the zone of the main heat source on the one hand and the zone on the other hand, in which the major part of the aerosol entering the smoker's mouth is generated, are spatially separated.
  • the aerosol is generated in the outer jacket and the heat in the inner core of the strand part of the cigarette.
  • Both the strand part and the subsequent filter part that is to say the materials used here in connection with their fluidically important specifications, are designed in such a way that the flows in the outer jacket and in the core are largely separated.
  • the filter part is designed so that the smoke particles originating from the inner core of the strand part are largely reduced, while the aerosol generated in the outer jacket of the strand part is reduced only slightly or not at all.
  • the secondary smoke can be largely reduced by relatively simple constructive measures, since the combustion products are shielded by the outer jacket of the strand part and are therefore largely emitted via the main smoke.
  • the mixture used for the strand part only delivers such small amounts of flue gas that an additional reduction by ventilation / diffusion is not necessary, then it is possible to work with a relatively simple, coaxial filter element with a suitable covering and an associated covering paper.
  • the covering paper can be impermeable to air, naturally porous and / or provided with a ventilation zone, which is preferably generated by laser beams and runs in the circumferential direction of the filter part.
  • the wrapping paper of the single filter element must also be porous. In all other cases, the wrapping paper can have any configuration.
  • the diffusion and ventilation element or the channel filter element serves to reduce the gas components caused by the combustion occurring in the inner core of the strand part, while the filter element combined therewith intercepts the smoke particles coming from the inner core of the strand part and those in the outer jacket of the strand part resulting aerosols are practically unaffected.
  • the coaxial filter cigarette shown in FIG. 1, generally indicated by the reference numeral 10, has a strand part 12 to which a coaxial filter part 13 is attached with the usual manufacturing techniques.
  • the strand part 12 contains an inner core 14 with a covering 16 and an outer jacket 18 with a covering 20.
  • the filter part 13 has a single coaxial filter element 15 consisting of a filter core 22 with a covering 24 and a filter jacket 26 with a covering 28.
  • the coaxial filter element 15 can be ventilated, as will be explained later; the ventilation means is indicated as a line of punctiform ventilation openings 30, which also extend through the circumference of the coaxial filter element 15 through the covering paper, not shown.
  • the coaxial strand part is used to generate smoke and steam and has a length of 25 to 85 mm and a diameter of 7 to 9 mm, i.e. the usual dimensions of conventional cigarettes.
  • the inner core 14 of the strand part 12 has a diameter of 2 to 6 mm and consists of tobacco or another permissible material that decomposes with the development of heat. Additives for controlling the combustion are added to the material of the inner core 14, which ensure that the heat generation zone of the strand part 12 is located in the inner core 14.
  • the air-impermeable envelope 16 of the inner core 14 of the strand part 12 is made of paper, a film of tobacco material or another suitable, air-impermeable material and has at least one channel for drawing air into the interior of the inner core 14, in order in this way to burn to control in the heat generation zone in the inner core 14.
  • the air intake duct (s) must extend from the ignition side at least over part of the length of the strand part 12 in accordance with the desired number of trains.
  • the inner core 14 can be formed, for example, by an extrudate or by a compact with embossed channels; as an alternative, the material of the inner core 14 can be formed as an open-pore body; in addition, the sheath 16 of the inner core 14 can be double-walled with continuous inner channels; and finally, the sheath 16 of the inner core 14 of the strand part 12 can contain rod-shaped protuberances on the inside as spacers.
  • the envelope 16 of the inner core 14 can be embossed, corrugated or corrugated, so that free flow channels are created in the longitudinal direction of the coaxial filter cigarette 10.
  • the outer jacket 18 of the strand part 12 consists of tobacco, of other materials made from tobacco, of materials which decompose when heat is added (and / or of materials which are thermally stable at temperatures of up to 500 or 600 ° C.), which are mechanically Allow action to crumble and / or from combinations of such materials and contains additives for controlling the thermal processes as well as the combination of flavoring and flavoring substances, also known as "casing", which are generally present in solvents and contain sugar, humectants and similar substances.
  • Both the additives for controlling the thermal processes and the casing materials are preferably present in high concentration, that is to say in total concentrations of more than 5%, based on the material weight of the outer casing 18 of the strand part 12.
  • the outer jacket 18 can also contain further materials which, when heated to a temperature of approximately 500 ° C., largely change to the vapor and / or aerosol state without releasing undesired components.
  • the outer casing 20 of the outer jacket 18 of the strand part 12 is either impermeable to air or has a very low air permeability of less than 25 ISO units; it consists of a cigarette paper, preferably with a heat-insulating coating, or of a heat-insulating material and also contains additives for controlling the combustion.
  • the outer casing 20 of the outer casing 18 of the strand part 12 can be provided with segment perforations for controlling the temperature gradient in the outer casing 18; the use and / or the The design of these segment perforations depends on the other materials used.
  • the filter part 13 according to the embodiment according to FIG. 1 can consist of a single, coaxial filter element 15, the outer diameter of which corresponds to the outer diameter of the Strand part 12 corresponds, that is about 7 to 9 mm.
  • the length of this coaxial filter element 15 is in the range of 10 to 40 mm.
  • the diameter of the filter core 22 is in the range from 2 to 6 mm, thus corresponds approximately to the diameter of the inner core 14 of the strand part 12 and, according to a preferred embodiment, is approximately 2 mm larger than the diameter of the inner core 14.
  • the filtration capacity of the filter core 22 should be more than 95% of the smoke flowing into the filter core 22.
  • the filter core 22 can consist of the usual filter materials, cellulose acetate being preferably used.
  • the envelope of the filter core 22 is impermeable to air and can consist of paper, polyethylene or preferably also of cellulose acetate.
  • the filter jacket 26 has a filtration performance of 0 to 60% of the smoke flowing into the filter jacket 26, in particular a filtration performance of 10 to 30%, and can consist of the known filter materials, but also of tobacco.
  • the filter jacket 26 is made from cellulose acetate.
  • a suitable covering 28 is used in combination with a covering paper, which is impermeable to air, porous and / or provided with a ventilation zone 30 which is preferably produced with laser beams and extends in the circumferential direction.
  • the covering paper, which is used to fasten the filter element 15 to the strand part 12, is porous or pre-perforated, must the wrapping 28 of the filter jacket 26, generally wrapping paper, also be porous. In all other cases, the air permeability of the casing 28 of the filter jacket 26 can be selected as desired.
  • the mixture in the strand part 12 delivers such large amounts of flue gas that the coaxial filter element 15 alone is not sufficient;
  • the embodiment according to FIG. 2 can be used, in which the filter element 15 with the construction discussed above is combined with a diffusion and ventilation element 32 on the strand side.
  • the air permeability of the casing 28 of the outer jacket 26 of the filter part 15 is arbitrary; the cover 28 can either be provided with an air-impermeable covering paper or the same covering paper can be used as with the diffusion and ventilation element 32 to be explained below; in the first case two different covering papers are required for the two filter elements, while in the second case one works with a single, uniform covering paper for the entire filter part 13.
  • the strand-side diffusion and ventilation element 32 has a length of 10 to 40 mm and a diameter which corresponds to the diameter of the outer jacket 18 of the strand part 12, that is to say in the range from about 7 to 9 mm.
  • the diffusion and ventilation element 32 can be designed as a fiber filter with the lowest packing density that can still be processed, or as a hollow element made of a plastic material; Such a hollow element 32 with a cavity 33 is indicated in FIG. 2.
  • the hollow element 32 can contain conventional chamber filter materials or other bulk material which is suitable for reducing the components of the gas phase of the smoke which is produced.
  • the outer surface of the hollow element 32 must have a sufficient number of perforations; the total perforation area must amount to at least 10% of the outer surface of the hollow element 32, the walls of the outer channels 34, which are still to be explained, being in any case impermeable and not perforated.
  • inwardly air-impermeable outer channels 34 are provided, which have a rectangular shape, the longer side of the rectangle being perpendicular to the outer surface of the ventilation and diffusion element 32, as can be seen in FIG. 3.
  • the determining criterion for the shape of the outer channels 34 is the largest possible cross-sectional area with the smallest possible proportion of the outer surface of the element 32.
  • the radial depth of the channels 34 must not be greater than the radius of the outer jacket 18 of the strand part 12, minus the radius of the inner core 14 of the strand part 12.
  • the mouth-side end face of the hollow element 32 i.e. the end face facing the filter element 15, is designed such that the flow from the outer channels 34 into the filter jacket 26 of the subsequent coaxial filter element 15 and the flow from the cavity of the hollow element 32 into the filter core 22 of the subsequent filter element 15 are performed.
  • the ventilation and diffusion element 32 and in particular its separating function between the filter element 15 and the strand part 12 can be achieved by a corresponding partial sealing of the mouth-side end face of the filter element 32 by using a specially shaped one Implement filter elements with an aperture, as is known in principle from DE-PS 34 00 004, or by using an additional intermediate element, not shown in FIG. 2, with the following properties:
  • the intermediate element has a length of 3 to 7 mm, a diameter that corresponds to the outer diameter of the filter element 15, outer channels that correspond to the outer channels 34 of the hollow element 32, and a hollow inner tube whose diameter is at least 1 mm smaller than the diameter of the Filter core 22 of the filter element 15.
  • This intermediate element must consist of an air-impermeable material.
  • the casing 28 of the hollow element 32 has a very high air permeability of at least 10,000 ISO units; this desired, high air permeability can also be achieved in that no casing 28 is used at all.
  • a covering paper with low air permeability in the range from 20 to 150 ISO units serves to connect the filter part 13 to the strand part 12, which paper should at the same time ensure a high diffusion of gases with a low molecular weight (eg CO).
  • the filter part 13 according to FIG. 2 can also be provided with a ventilation zone 30 which is located approximately 2 to 5 mm from the mouth end of the element 32 and ensures that the filter part 13 has a degree of ventilation of 5 to 80%.
  • FIG. 4 shows a further embodiment of the filter part 13, which in this case consists of a mouth-side filter element 36 and a line-side channel filter element 38.
  • the mouth-side filter element 36 has a length of 6 to 24 mm, a diameter of 7 to 9 mm, which corresponds to the diameter of the strand part 12, and consists of a material with the usual filter properties, preferably cellulose acetate.
  • the filter material of the filter element 36 has a specific tensile resistance of preferably less than 150 Pa / cm.
  • a ventilation zone 30 can be provided which guarantees a degree of ventilation of 5 to 80%.
  • the ventilation zone should be at a distance of at least 10 mm from the mouth end of the filter element 36 and thus of the filter part 13 in order to rule out that the smoker's lips can close the ventilation perforations.
  • the strand-side channel filter element 38 has a length of 10 to 34 mm and also has outer channels 34, as are provided in the embodiment according to FIG. 2.
  • the covering 28 and the covering paper (not shown) of the filter element 13 also have the properties described in relation to the embodiment according to FIG. 2.
  • the channel filter element 38 on the strand side is filled with the usual filter materials, in particular cellulose acetate, the specification of which is selected as a function of the length of the channel filter element 38 so that at least 95% of the smoke particles coming from the inner core 14 of the strand part 12 are filtered.

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  • Cigarettes, Filters, And Manufacturing Of Filters (AREA)
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Abstract

A coaxial filter cigarette (10) having a rod part (12) with an inner core (14) of a material, in particular tobacco material, which smoulders in a substantially residue-free manner, a wrapper (16) for the inner core, an outer shell (18) of a tobacco and/or a non-tobacco material which coaxially surrounds the inner core and its wrapper, and a wrapper (20) for the outer shell, and having a filter part (13) with a filter core (22), an air-impermeable wrapper (24) for the filter core, a filter shell (26) and a wrapper (28) for the filter shell has one zone for the primary heat source, which is located within the inner core (14) of the rod part, and one zone in which the essential proportion of the aerosol passing into the smoker's mouth is generated and which is located in the outer shell (18) of the rod part; the filter part (13) distinctly reduces the combustion gases originating from the inner core of the rod part, and substantially reduces the smoke particles originating from the inner core, whereas the aerosol generated in the outer shell of the rod part is influenced only slightly, if at all. <IMAGE>

Description

Die Erfindung betrifft eine koaxiale Filtercigarette der im Oberbegriff des Anspruchs 1 angegebenen Gattung.The invention relates to a coaxial filter cigarette of the type specified in the preamble of claim 1.

Es gibt eine Reihe von Veröffentlichungen über sogenannte "koaxiale rauchbare Artikel", also insbesondere Koaxial-Cigarren oder -Cigaretten mit einem Innenkern, der durch einen Mantel aus Tabakmaterial umgeben ist. Das Grundprinzip einer solchen Koaxial-Cigarette ist beispiels­weise aus der FR-PS 998 556 bekannt, wobei der Innenkern aus einem Tabak geringerer Qualität besteht, der von einem ringförmigen Mantel aus Tabak hoher Qualität umgeben ist. Dadurch lassen sich Einsparungen in Bezug auf die Kosten der verwendeten Tabakmaterialien erzielen.There are a number of publications on so-called "coaxial smokable articles", in particular coaxial cigars or cigarettes with an inner core which is surrounded by a jacket made of tobacco material. The basic principle of such a coaxial cigarette is known for example from FR-PS 998 556, the inner core consisting of a tobacco of lower quality, which is surrounded by an annular jacket made of tobacco of high quality. This allows savings to be made in terms of the cost of the tobacco materials used.

Weitere Ausgestaltungen solcher Koaxial-Cigaretten gehen aus der FR-PS 13 22 254, der US-PS 3 614 956, der US-PS 4 219 031, der GB-OS 20 70 409, der GB-PS 10 86 443 und der DE-OS 36 02 846 hervor.Further refinements of such coaxial cigarettes go from FR-PS 13 22 254, US-PS 3 614 956, US-PS 4 219 031, GB-OS 20 70 409, GB-PS 10 86 443 and DE -OS 36 02 846.

Außerdem ist aus der US-PS 3 356 094 eine Koaxial-Cigarette mit einem inneren Hohlrohr und einer Aerosol-Erzeugungszone mit engem Auslaß bekannt; die Herstellung dieser Koaxial-Cigarette ist jedoch sehr aufwendig und damit kostspielig; außerdem werden die verschiedenen Be­standteile voneinander getrennt, so daß sich ein ungewöhnliches Rauch­muster ergibt.In addition, a coaxial cigarette with an inner hollow tube and an aerosol production zone with a narrow outlet is known from US Pat. No. 3,356,094; however, the production of this coaxial cigarette is very complex and therefore expensive; In addition, the different components are separated from each other, so that there is an unusual smoking pattern.

Eine koaxiale Filtercigarette der angegebenen Gattung ist schließlich aus der älteren Patentanmeldung P 37 43 597.3-23 vom 22.12.1987 bekannt und weist einen Strangteil und einen Filterteil auf; der Strangteil enthält einen Innenkern aus einem weitgehend rückstandsfrei verglimmen­den Material, insbesondere Tabakmaterial, eine Umhüllung für den Innen­kern, einen den Innenkern bzw. seine Umhüllung koaxial umgebenden Außenmantel aus einem Tabak- und/oder Nicht-Tabakmaterial, sowie eine Umhüllung für den Außenmantel.A coaxial filter cigarette of the type specified is finally known from the older patent application P 37 43 597.3-23 from December 22, 1987 and has a strand part and a filter part; the strand part contains an inner core made of a largely residue-free smoldering material, in particular tobacco material, a covering for the inner core, an outer casing made of a tobacco and / or non-tobacco material coaxially surrounding the inner core or its casing, and a casing for the outer casing.

Der Filterteil weist einen Filterkern, eine luftundurchlässige Umhül­lung für den Filterkern, einen Filtermantel und eine Umhüllung für den Filtermantel auf.The filter part has a filter core, an air-impermeable covering for the filter core, a filter jacket and a covering for the filter jacket.

Das Grundprinzip bei dieser koaxialen Filtercigarette liegt darin, daß in radialer Richtung zwei Bereiche unterschieden werden, nämlich die Zone der Haupt-Wärmequelle einerseits und die Zone andererseits, in der der wesentliche Teil des in den Mund des Rauchers gelangenden Aerosols erzeugt wird. Dabei befindet sich die Wärmeerzeugungs-Zone im Außen­mantel und die Aerosol-Erzeugungszone im Innenkern des Strangteils.The basic principle of this coaxial filter cigarette is that two areas are distinguished in the radial direction, namely the zone of the main heat source on the one hand and the zone in which the major part of the aerosol entering the smoker's mouth is generated. The heat generation zone is in the outer jacket and the aerosol generation zone is in the inner core of the strand part.

Problematisch bei einer solchen Auslegung einer koaxialen Filterciga­rette ist die angestrebte Reduzierung des Nebenrauches, die sich nur mit großem Aufwand erreichen läßt. Außerdem hat eine solche koaxiale Filtercigarette ein Entzündungspotential ähnlich einer konventionellen Cigarette.The problem with such a design of a coaxial filter cigarette is the desired reduction in secondary smoke, which can only be achieved with great effort. In addition, such a coaxial filter cigarette has an inflammation potential similar to that of a conventional cigarette.

Der Erfindung liegt deshalb die Aufgabe zugrunde, eine koaxiale Filter­cigarette der angegebenen Gattung zu schaffen, bei der die oben er­wähnten Nachteile nicht auftreten.The invention is therefore based on the object of providing a coaxial filter cigarette of the type specified, in which the disadvantages mentioned above do not occur.

Insbesondere soll eine koaxiale Filtercigarette vorgeschlagen werden, deren in den Mund des Rauchers gelangender Rauch einen hohen Anteil an geschmacklich relevanten Komponenten und einen sehr geringen Anteil an unerwünschten Verbrennungsprodukten hat; gleichzeitig sollen der Neben­rauch einerseits und das Entzündungspotential andererseits im Vergleich mit konventionellen Cigaretten verringert werden. Dies wird erfindungs­gemäß durch die im kennzeichnenden Teil des Anspruchs 1 angegebenen Merkmale erreicht.In particular, a coaxial filter cigarette is to be proposed, the smoke that enters the smoker's mouth has a high proportion of taste-relevant components and a very low proportion of undesirable combustion products; At the same time, the secondary smoke on the one hand and the inflammation potential on the other hand are to be reduced in comparison with conventional cigarettes. This is achieved according to the invention by the features specified in the characterizing part of claim 1.

Zweckmäßige Ausgestaltungen werden durch die Merkmale der Unteran­sprüche definiert.Appropriate configurations are defined by the features of the subclaims.

Die mit der Erfindung erzielten Vorteile beruhen darauf, daß in einem koaxialen Strang die Zone der hauptsächlichen Wärmequelle einerseits und die Zone andererseits, in der der wesentliche Anteil des in den Mund des Rauchers gelangenden Aerosols erzeugt wird, räumlich ge­trennt sind. Dabei werden im Gegensatz zu der koaxialen Filtercigarette nach der älteren Patentanmeldung P 37 43 597.3-23 das Aerosol im Außen­mantel und die Wärme im Innenkern des Strangteils der Cigarette er­zeugt.The advantages achieved with the invention are based on the fact that in a coaxial strand the zone of the main heat source on the one hand and the zone on the other hand, in which the major part of the aerosol entering the smoker's mouth is generated, are spatially separated. In contrast to the coaxial filter cigarette according to the earlier patent application P 37 43 597.3-23, the aerosol is generated in the outer jacket and the heat in the inner core of the strand part of the cigarette.

Sowohl der Strangteil als auch der anschließende Filterteil, also die hier verwendeten Materialen in Verbindung mit ihren strömungstechnisch wesentlichen Spezifikationen, sind so ausgelegt, daß eine weitgehende Trennung der Strömungen im Außenmantel und im Kern gewährleistet ist.Both the strand part and the subsequent filter part, that is to say the materials used here in connection with their fluidically important specifications, are designed in such a way that the flows in the outer jacket and in the core are largely separated.

Dabei ist der Filterteil so konstruiert, daß die aus dem Innenkern des Strangteils stammenden Rauchpartikel weitgehend reduziert werden, wäh­rend das in dem Außenmantel des Strangteils erzeugte Aerosol nur wenig oder gar nicht verringert wird.The filter part is designed so that the smoke particles originating from the inner core of the strand part are largely reduced, while the aerosol generated in the outer jacket of the strand part is reduced only slightly or not at all.

Durch die räumliche Anordnung der Wärmeerzeugung in dem Innenkern des Strangteils läßt sich der Nebenrauch durch relativ einfache konstruk­tive Maßnahmen weitgehend verringern, da die Verbrennungsprodukte durch den Außenmantel des Strangteils abgeschirmt und damit weitgehend über den Hauptrauch abgegeben werden.Due to the spatial arrangement of the heat generation in the inner core of the strand part, the secondary smoke can be largely reduced by relatively simple constructive measures, since the combustion products are shielded by the outer jacket of the strand part and are therefore largely emitted via the main smoke.

Gleichzeitig ergibt sich eine Reduzierung des Entzündungspotentials der Cigarette, da sich die Wärmeerzeugungszone im Innenkern des Strang­teils befindet und deshalb ebenfalls durch den Außenmantel abge­schirmt wird. Die Temperaturen an der Oberfläche der Cigarette sind also vergleichsweise gering, so daß selbst bei längerem Kontakt zwischen den Umfangsflächen der Cigarette und einem brennbaren Material keine Entzündung erfolgt.At the same time, there is a reduction in the ignition potential of the cigarette, since the heat generation zone is located in the inner core of the strand part and is therefore also shielded by the outer jacket. The temperatures on the surface of the cigarette are therefore comparatively low, so that even with prolonged contact between the peripheral surfaces of the cigarette and a combustible material there is no ignition.

Würde man bei einer filterlosen Koaxial-Cigarette die Wärmeerzeugungs­zone in den Innenkern verlegen, so würde ein hoher Anteil an Kohlen­monxid (CO) bzw. unerwünschten Rauchkomponenten aus der Verbrennungs­zone in den Mund des Rauchers gelangen; außerdem würde bei einer Ab­dichtung des Endes des Innenkern des Strangteils keine Reaktion der Verbrennungszone auf das Ziehen des Rauchers erfolgen.If you were to move the heat generation zone in the inner core of a filterless coaxial cigarette, a high proportion of carbon monoxide (CO) or undesirable smoke components from the combustion zone would get into the smoker's mouth; furthermore, if the end of the inner core of the strand part were sealed, there would be no reaction of the combustion zone to the drawing of the smoker.

Diese Nachteile lassen sich durch eine an die Ausgestaltung des Strang­teils angepaßte Ausgestaltung des Filterteils vermeiden, der so ausge­legt wird, daß die aus dem Innenkern des Strangteils stammenden Rauch­partikel weitgehend reduziert werden, während das in dem Außenmantel des Strangteils entstehende Aerosol nur wenig oder gar nicht beeinflußt wird.These disadvantages can be avoided by a design of the filter part which is adapted to the design of the strand part and which is designed such that the smoke particles originating from the inner core of the strand part are largely reduced, while the aerosol formed in the outer jacket of the strand part has little or no influence becomes.

Wenn die für den Strangteil verwendete Mischung nur derart geringe Rauchgasmengen liefert, daß eine zusätzliche Verminderung durch Venti­lation/Diffusion nicht erforderlich ist, so kann mit einem relativ ein­fachen, koaxialen Filterelement mit einer geeigneten Umhüllung und einem zugeordneten Belagpapier gearbeitet werden. Das Belagpapier kann luftundurchlässig, von Natur porös und/oder mit einer Ventilationszone versehen sein, die vorzugsweise durch Laserstrahlen erzeugt wird und in Umfangsrichtung des Filterteils verläuft.If the mixture used for the strand part only delivers such small amounts of flue gas that an additional reduction by ventilation / diffusion is not necessary, then it is possible to work with a relatively simple, coaxial filter element with a suitable covering and an associated covering paper. The covering paper can be impermeable to air, naturally porous and / or provided with a ventilation zone, which is preferably generated by laser beams and runs in the circumferential direction of the filter part.

Wenn das Belagpapier porös oder vorperforiert ist, muß das Umhüllungs­papier des einzigen Filterelementes auch porös sein. In allen anderen Fällen kann das Umhüllungspapier eine beliebige Ausgestaltung haben.If the covering paper is porous or pre-perforated, the wrapping paper of the single filter element must also be porous. In all other cases, the wrapping paper can have any configuration.

Für die meisten Anwendungsfälle wird jedoch ein solches mundseitiges Filterelement mit einem strangseitigen Diffusions- und Ventilations­ element (Kanalfilterelement) kombiniert, um eine optimale Anpassung an die vom Strangteil erzeugten Rauchprodukte und Aerosole zu gewährleisten.For most applications, however, such a mouth-side filter element with a strand-side diffusion and ventilation element (channel filter element) combined to ensure optimal adaptation to the smoke products and aerosols generated by the strand part.

In diesen Fällen dient also das Diffusions- und Ventilationselement bzw. das Kanalfilterelement zur Reduzierung der Gaskomponenten, die durch die im Innenkern des Strangteils stattfindende Verbrennung ent­stehen, während das damit kombinierte Filterelement die aus dem Innenkern des Strangteils stammenden Rauchpartikel abfängt und die im Außenmantel des Strangteils entstehenden Aerosole praktisch nicht beeinflußt werden.In these cases, the diffusion and ventilation element or the channel filter element serves to reduce the gas components caused by the combustion occurring in the inner core of the strand part, while the filter element combined therewith intercepts the smoke particles coming from the inner core of the strand part and those in the outer jacket of the strand part resulting aerosols are practically unaffected.

Die Erfindung wird im folgenden anhand von Ausführungsbeispielen unter Bezugnahme auf die beiliegenden schematischen Zeichnungen näher er­läutert. Es zeigen

  • Fig. 1 einen axialen Schnitt durch eine koaxiale Filterciga­rette,
  • Fig. 2 eine Fig. 1 entsprechende Darstellung einer weiteren Aus­führungsform des Filterteils einer solchen koaxialen Fil­tercigarette,
  • Fig. 3 einen Schnitt durch das strangseitige Diffusions- und Ventilationselement des Filterteils nach Fig. 2, und
  • Fig. 4 eine Fig. 1 entsprechende Darstellung einer weiteren Aus­führungsform des Filterteils.
The invention is explained in more detail below on the basis of exemplary embodiments with reference to the accompanying schematic drawings. Show it
  • 1 shows an axial section through a coaxial filter cigarette,
  • 2 shows a representation corresponding to FIG. 1 of a further embodiment of the filter part of such a coaxial filter cigarette,
  • 3 shows a section through the diffusion and ventilation element on the strand side of the filter part according to FIG. 2, and
  • FIG. 4 shows a representation corresponding to FIG. 1 of a further embodiment of the filter part.

Die aus Fig. 1 ersichtliche, allgemein durch das Bezugszeichen 10 ange­deutete koaxiale Filtercigarette weist einen Strangteil 12 auf, an den mit den üblichen Fertigungstechniken ein koaxialer Filterteil 13 ange­setzt ist. Der Strangteil 12 enthält einen Innenkern 14 mit einer Um­hüllung 16 sowie einen Außenmantel 18 mit einer Umhüllung 20.The coaxial filter cigarette shown in FIG. 1, generally indicated by the reference numeral 10, has a strand part 12 to which a coaxial filter part 13 is attached with the usual manufacturing techniques. The strand part 12 contains an inner core 14 with a covering 16 and an outer jacket 18 with a covering 20.

Bei der Ausführungsform nach Fig. 1 weist der Filterteil 13 ein einziges koaxiales Filterelement 15 aus einem Filterkern 22 mit einer Umhüllung 24 und einem Filtermantel 26 mit einer Umhüllung 28 auf.In the embodiment according to FIG. 1, the filter part 13 has a single coaxial filter element 15 consisting of a filter core 22 with a covering 24 and a filter jacket 26 with a covering 28.

Das koaxiale Filterelement 15 kann ventiliert sein, wie noch erläutert werden soll; das Ventilationsmittel ist als Linie von punktförmigen Ventilationsöffnungen 30 angedeutet, die sich über den Umfang des koaxialen Filterelements 15 auch durch das nicht dargestellte Belag­papier erstrecken.The coaxial filter element 15 can be ventilated, as will be explained later; the ventilation means is indicated as a line of punctiform ventilation openings 30, which also extend through the circumference of the coaxial filter element 15 through the covering paper, not shown.

Der koaxiale Strangteil dient zur Rauch- und Dampferzeugung und hat eine Länge von 25 bis 85 mm und einen Durchmesser von 7 bis 9 mm, also die üblichen Abmessungen konventioneller Cigaretten.The coaxial strand part is used to generate smoke and steam and has a length of 25 to 85 mm and a diameter of 7 to 9 mm, i.e. the usual dimensions of conventional cigarettes.

Der Innenkern 14 des Strangteils 12 hat einen Durchmesser von 2 bis 6 mm und besteht aus Tabak oder einem anderen, zulässigen Material, das sich unter Wärmeentwicklung zersetzt. Dem Material des Innenkerns 14 sind Additive zur Steuerung der Verbrennung zugesetzt, die gewähr­leisten, daß sich die Wärmeerzeugungszone des Strangteils 12 in dem Innenkern 14 befindet.The inner core 14 of the strand part 12 has a diameter of 2 to 6 mm and consists of tobacco or another permissible material that decomposes with the development of heat. Additives for controlling the combustion are added to the material of the inner core 14, which ensure that the heat generation zone of the strand part 12 is located in the inner core 14.

Die luftundurchlässige Umhüllung 16 des Innenkerns 14 des Strangteils 12 besteht aus Papier, aus einer Folie aus Tabakmaterial oder einem anderen, geeigneten, luftundurchlässigen Material und weist mindestens einen Kanal zum Ansaugen von Luft in das Innere des Innenkerns 14 auf, um auf diese Weise die Verbrennung in der Wärmeerzeugungszone im Innenkern 14 zu steuern. Der bzw. die Luftansaugkanäle müssen sich von der Anzündungsseite her zumindest über einen Teil der Länge des Strang­teils 12 erstrecken entsprechend der angestrebten Zugzahl.The air-impermeable envelope 16 of the inner core 14 of the strand part 12 is made of paper, a film of tobacco material or another suitable, air-impermeable material and has at least one channel for drawing air into the interior of the inner core 14, in order in this way to burn to control in the heat generation zone in the inner core 14. The air intake duct (s) must extend from the ignition side at least over part of the length of the strand part 12 in accordance with the desired number of trains.

Zur Realisierung dieses Luftansaugkanals stehen verschiedene Alterna­tiven zur Verfügung; der Innenkern 14 kann beispielsweise durch ein Extrudat oder durch einen Pressling mit eingeprägten Kanälen gebildet werden; als Alternative kann das Material des Innenkerns 14 als offenporiger Körper ausgebildet werden; außerdem kann die Umhüllung 16 des Innenkerns 14 doppelwandig mit durchgehenden inneren Kanälen ausgebildet sein; und schließlich kann die Umhüllung 16 des Innenkerns 14 des Strangteils 12 an der Innenseite stabförmige Ausstülpungen als Abstandhalter enthalten.Various alternatives are available for realizing this air intake duct; the inner core 14 can be formed, for example, by an extrudate or by a compact with embossed channels; as an alternative, the material of the inner core 14 can be formed as an open-pore body; in addition, the sheath 16 of the inner core 14 can be double-walled with continuous inner channels; and finally, the sheath 16 of the inner core 14 of the strand part 12 can contain rod-shaped protuberances on the inside as spacers.

Die Umhüllung 16 des Innenkerns 14 kann geprägt, gewellt oder geriffelt sein, so daß freie Strömungskanäle in Längsrichtung der koaxialen Filtercigarette 10 entstehen.The envelope 16 of the inner core 14 can be embossed, corrugated or corrugated, so that free flow channels are created in the longitudinal direction of the coaxial filter cigarette 10.

Der Außenmantel 18 des Strangteils 12 besteht aus Tabak, aus anderen, aus Tabak hergestellten Materialien, aus sich bei Wärmezufuhr zer­setzenden Materialien (und/oder aus Materialien, die bei Temperaturen bis zu 500 bzw. 600° C thermisch stabil sind) die sich unter mechani­scher Einwirkung zerkrümeln lassen und/oder aus Kombinationen solcher Materialien und enthält Additive zur Steuerung der thermischen Prozesse sowie die auch als "Casing" bezeichnete Kombination von Aroma- und Flavourstoffen, die im allgemeinen in Lösungsmitteln vorliegen und Zucker, Feuchthaltemittel und ähnliche Substanzen enthalten.The outer jacket 18 of the strand part 12 consists of tobacco, of other materials made from tobacco, of materials which decompose when heat is added (and / or of materials which are thermally stable at temperatures of up to 500 or 600 ° C.), which are mechanically Allow action to crumble and / or from combinations of such materials and contains additives for controlling the thermal processes as well as the combination of flavoring and flavoring substances, also known as "casing", which are generally present in solvents and contain sugar, humectants and similar substances.

Sowohl die Additive zur Steuerung der thermischen Prozesse als auch die Casing-Materialien liegen vorzugsweise in hoher Konzentration vor, also in Gesamtkonzentrationen von mehr als 5 %, bezogen auf das Material­gewicht des Außenmantels 18 des Strangteils 12.Both the additives for controlling the thermal processes and the casing materials are preferably present in high concentration, that is to say in total concentrations of more than 5%, based on the material weight of the outer casing 18 of the strand part 12.

Als Alternative hierzu oder zusätzlich kann der Außenmantel 18 noch weitere Materialien enthalten, die bei Erwärmung bis auf eine Tempe­ratur von etwa 500° C zum größten Teil in den Dampf- und/oder Aerosol­zustand übergehen, ohne daß unerwünschte Komponenten freigesetzt werden.As an alternative to this or in addition, the outer jacket 18 can also contain further materials which, when heated to a temperature of approximately 500 ° C., largely change to the vapor and / or aerosol state without releasing undesired components.

Die äußere Umhüllung 20 des Außenmantels 18 des Strangteils 12 ist entweder luftundurchlässig oder hat eine sehr geringe Luftdurchlässig­keit von weniger als 25 ISO-Einheiten; sie besteht aus einem Cigaret­ten-Papier, vorzugsweise mit einer wärmeisolierenden Beschichtung, oder aus einem wärmeisolierenden Material und enthält ebenfalls Additive zur Steuerung der Verbrennung.The outer casing 20 of the outer jacket 18 of the strand part 12 is either impermeable to air or has a very low air permeability of less than 25 ISO units; it consists of a cigarette paper, preferably with a heat-insulating coating, or of a heat-insulating material and also contains additives for controlling the combustion.

Gegebenenfalls kann die äußere Umhüllung 20 des Außenmantels 18 des Strangteils 12 mit Segment-Perforationen zur Steuerung des Temperatur­gradienten im Außenmantel 18 versehen sein; die Verwendung und/oder die Ausgestaltung dieser Segment-Perforationen hängt von den sonstigen, verwendeten Materialien ab.If appropriate, the outer casing 20 of the outer casing 18 of the strand part 12 can be provided with segment perforations for controlling the temperature gradient in the outer casing 18; the use and / or the The design of these segment perforations depends on the other materials used.

Liefert die Mischung im Strangteil 12 derart geringe Rauchgasmengen, daß eine zusätzliche Verminderung der Rauchgasmenge durch Ventilation/­Diffusion nicht erforderlich ist, so kann der Filterteil 13 entspre­chend der Ausführungsform nach Fig. 1 aus einem einzigen, koaxialen Filterelement 15 bestehen, dessen Außendurchmesser dem Außendurchmesser des Strangteils 12 entspricht, also etwa 7 bis 9 mm beträgt. Die Länge dieses koaxialen Filterelementes 15 liegt im Bereich von 10 bis 40 mm.If the mixture in the strand part 12 delivers such small amounts of flue gas that an additional reduction in the amount of flue gas by ventilation / diffusion is not necessary, then the filter part 13 according to the embodiment according to FIG. 1 can consist of a single, coaxial filter element 15, the outer diameter of which corresponds to the outer diameter of the Strand part 12 corresponds, that is about 7 to 9 mm. The length of this coaxial filter element 15 is in the range of 10 to 40 mm.

Der Durchmesser des Filterkerns 22 liegt im Bereich von 2 bis 6 mm, entspricht also in etwa dem Durchmesser des Innenkerns 14 des Strang­teils 12 und ist nach einer bevorzugten Ausführungsform etwa 2 mm größer als der Durchmesser des Innenkerns 14.The diameter of the filter core 22 is in the range from 2 to 6 mm, thus corresponds approximately to the diameter of the inner core 14 of the strand part 12 and, according to a preferred embodiment, is approximately 2 mm larger than the diameter of the inner core 14.

Die Filtrationsleistung des Filterkerns 22 sollte mehr als 95 % des in den Filterkern 22 einströmenden Rauches betragen. Der Filterkern 22 kann aus den üblichen Filtermaterialien bestehen, wobei bevorzugt Zelluloseacetat eingesetzt wird.The filtration capacity of the filter core 22 should be more than 95% of the smoke flowing into the filter core 22. The filter core 22 can consist of the usual filter materials, cellulose acetate being preferably used.

Die Umhüllung des Filterkerns 22 ist luftundurchlässig und kann aus Papier, Polyethylen oder bevorzugt ebenfalls aus Zelluloseacetat be­stehen.The envelope of the filter core 22 is impermeable to air and can consist of paper, polyethylene or preferably also of cellulose acetate.

Der Filtermantel 26 hat eine Filtrationsleistung von 0 bis 60 % des in den Filtermantel 26 einströmenden Rauches, insbesondere eine Filtra­tionsleistung von 10 bis 30 %, und kann aus den bekannten Filter­materialen, aber auch aus Tabak bestehen.The filter jacket 26 has a filtration performance of 0 to 60% of the smoke flowing into the filter jacket 26, in particular a filtration performance of 10 to 30%, and can consist of the known filter materials, but also of tobacco.

Nach einer bevorzugten Ausführungsform wird der Filtermantel 26 aus Zelluloseacetat hergestellt.In a preferred embodiment, the filter jacket 26 is made from cellulose acetate.

Wird nur das koaxiale Filterelement 15 verwendet, so wird eine ge­eignete Umhüllung 28 in Kombination mit einem Belagpapier eingesetzt, das luftundurchlässig, porös und/oder mit einer vorzugsweise mit Laser­strahlen erzeugten, in Umfangsrichtung verlaufenden Ventilationszone 30 versehen ist.If only the coaxial filter element 15 is used, a suitable covering 28 is used in combination with a covering paper, which is impermeable to air, porous and / or provided with a ventilation zone 30 which is preferably produced with laser beams and extends in the circumferential direction.

Nur wenn das Belagpapier, das zur Befestigung des Filterelementes 15 an dem Strangteil 12 dient, porös oder vorperforiert ist, muß die Um­hüllung 28 des Filtermantels 26, im allgemeinen Umhüllungspapier, auch porös sein. In allen anderen Fällen kann die Luftdurchlässigkeit der Umhüllung 28 des Filtermantels 26 beliebig ausgewählt werden.Only if the covering paper, which is used to fasten the filter element 15 to the strand part 12, is porous or pre-perforated, must the wrapping 28 of the filter jacket 26, generally wrapping paper, also be porous. In all other cases, the air permeability of the casing 28 of the filter jacket 26 can be selected as desired.

In der Regel liefert jedoch die Mischung im Strangteil 12 so große Rauchgasmengen, daß das koaxiale Filterelement 15 allein nicht aus­reicht; in diesem Fall kann die Ausführungsform nach Fig. 2 verwendet werden, bei der das Filterelement 15 mit dem oben erörterten Aufbau mit einem strangseitigen Diffusions- und Ventilationselement 32 kombiniert ist. Dabei ist die Luftdurchlässigkeit der Umhüllung 28 des Außen­mantels 26 des Filterteils 15 beliebig; die Umhüllung 28 kann entweder mit einem luftundurchlässigen Belagpapier versehen oder das gleiche Belagpapier wie bei dem noch zu erläuternden Diffusions- und Venti­lationselement 32 verwendet werden; im ersten Fall sind zwei ver­schiedene Belagpapiere für die beiden Filterelemente erforderlich, während im zweiten Fall mit einem einzigen, einheitlichen Belagpapier für den gesamten Filterteil 13 gearbeitet wird.As a rule, however, the mixture in the strand part 12 delivers such large amounts of flue gas that the coaxial filter element 15 alone is not sufficient; In this case, the embodiment according to FIG. 2 can be used, in which the filter element 15 with the construction discussed above is combined with a diffusion and ventilation element 32 on the strand side. The air permeability of the casing 28 of the outer jacket 26 of the filter part 15 is arbitrary; the cover 28 can either be provided with an air-impermeable covering paper or the same covering paper can be used as with the diffusion and ventilation element 32 to be explained below; in the first case two different covering papers are required for the two filter elements, while in the second case one works with a single, uniform covering paper for the entire filter part 13.

Das strangseitige Diffusions- und Ventilationselement 32 hat eine Länge von 10 bis 40 mm und einen Durchmesser, der dem Durchmesser des Außen­mantels 18 des Strangteils 12 entspricht, also im Bereich von etwa 7 bis 9 mm liegt.The strand-side diffusion and ventilation element 32 has a length of 10 to 40 mm and a diameter which corresponds to the diameter of the outer jacket 18 of the strand part 12, that is to say in the range from about 7 to 9 mm.

Das Diffusions- und Ventilationselement 32 kann als Faserfilter mit der niedrigsten Packungsdichte, die noch verarbeitet werden kann, oder als Hohlelement aus einem Kunststoffmaterial ausgebildet sein; in Fig. 2 ist ein solches Hohlelement 32 mit einem Hohlraum 33 angedeutet.The diffusion and ventilation element 32 can be designed as a fiber filter with the lowest packing density that can still be processed, or as a hollow element made of a plastic material; Such a hollow element 32 with a cavity 33 is indicated in FIG. 2.

Das Hohlelement 32 kann gebräuchliche Kammerfiltermaterialien oder anderes Schüttgut enthalten, das zur Reduzierung der Komponenten der Gasphase des entstehenden Rauches geeignet ist.The hollow element 32 can contain conventional chamber filter materials or other bulk material which is suitable for reducing the components of the gas phase of the smoke which is produced.

Bei Verwendung eines luftundurchlässigen Materials für die Herstellung des Hohlelementes 32 muß die Außenfläche des Hohlelementes 32 eine hin­reichende Zahl von Perforationen aufweisen; die gesamte Perforations­fläche muß mindestens 10 % der Außenfläche des Hohlelementes 32 betra­gen, wobei die Wandungen der noch zu erläuternden Außenkanäle 34 in jedem Fall undurchlässig und nicht perforiert ausgestattet sind.When using an air-impermeable material for the production of the hollow element 32, the outer surface of the hollow element 32 must have a sufficient number of perforations; the total perforation area must amount to at least 10% of the outer surface of the hollow element 32, the walls of the outer channels 34, which are still to be explained, being in any case impermeable and not perforated.

In dem Ventilations- und Diffusionselement 32 sind mindestens vier nach innen luftundurchlässige Außenkanäle 34 vorgesehen, die Rechteckform haben, wobei die längere Seite des Rechteckes senkrecht zur Außenfläche des Ventilations- und Diffusionselementes 32 ist, wie man in Fig. 3 erkennt.In the ventilation and diffusion element 32 at least four inwardly air-impermeable outer channels 34 are provided, which have a rectangular shape, the longer side of the rectangle being perpendicular to the outer surface of the ventilation and diffusion element 32, as can be seen in FIG. 3.

Das bestimmende Kriterium für die Form der Außenkanäle 34 ist eine mög­lichst große Querschnittsfläche mit möglichst kleinem Anteil an der Außenfläche des Elementes 32.The determining criterion for the shape of the outer channels 34 is the largest possible cross-sectional area with the smallest possible proportion of the outer surface of the element 32.

Die radiale Tiefe der Kanäle 34 darf nicht größer als der Radius des Außenmantels 18 des Strangteils 12, abzüglich des Radius des Innenkerns 14 des Strangteils 12, sein.The radial depth of the channels 34 must not be greater than the radius of the outer jacket 18 of the strand part 12, minus the radius of the inner core 14 of the strand part 12.

Die mundseitige Stirnfläche des Hohlelementes 32, also die dem Filter­element 15 zugewandte Stirnfläche, ist so ausgelegt, daß die Strömung aus den Außenkanälen 34 in den Filtermantel 26 des anschließenden, koaxialen Filterelementes 15 und die Strömung aus dem Hohlraum des Hohlelementes 32 in den Filterkern 22 des anschließenden Filterele­mentes 15 geführt werden.The mouth-side end face of the hollow element 32, i.e. the end face facing the filter element 15, is designed such that the flow from the outer channels 34 into the filter jacket 26 of the subsequent coaxial filter element 15 and the flow from the cavity of the hollow element 32 into the filter core 22 of the subsequent filter element 15 are performed.

Als Möglichkeiten der Realisierung der beschriebenen Ausführungsform läßt sich das Ventilationsund Diffusionselement 32 und insbesondere seine Trennfunktion zwischen dem Filterelement 15 und dem Strangteil 12 durch eine entsprechende Teilversiegelung der mundseitigen Stirnfläche des Filterelementes 32, durch Verwendung eines speziell geformten Filterelementes mit Blende, wie es im Prinzip aus der DE-PS 34 00 004 bekannt ist, oder durch Verwendung eines zusätzlichen, in Fig. 2 nicht dargestellten Zwischenelementes mit folgenden Eigenschaften reali­sieren:As possibilities for realizing the described embodiment, the ventilation and diffusion element 32 and in particular its separating function between the filter element 15 and the strand part 12 can be achieved by a corresponding partial sealing of the mouth-side end face of the filter element 32 by using a specially shaped one Implement filter elements with an aperture, as is known in principle from DE-PS 34 00 004, or by using an additional intermediate element, not shown in FIG. 2, with the following properties:

Das Zwischenelement hat eine Länge von 3 bis 7 mm, einen Durchmesser, der dem Außendurchmesser des Filterelementes 15 entspricht, Außen­kanäle, die den Außenkanälen 34 des Hohlelementes 32 entsprechen, sowie ein hohles Innenrohr, dessen Durchmesser mindestens 1 mm kleiner ist, als der Durchmesser des Filterkerns 22 des Filterelementes 15. Dieses Zwischenelement muß aus einem luftundurchlässigen Material bestehen.The intermediate element has a length of 3 to 7 mm, a diameter that corresponds to the outer diameter of the filter element 15, outer channels that correspond to the outer channels 34 of the hollow element 32, and a hollow inner tube whose diameter is at least 1 mm smaller than the diameter of the Filter core 22 of the filter element 15. This intermediate element must consist of an air-impermeable material.

Die Umhüllung 28 des Hohlelementes 32 hat eine sehr hohe Luftdurch­lässigkeit von mindestens 10.000 ISO-Einheiten; diese angestrebte, hohe Luftdurchlässigkeit läßt sich auch dadurch erzielen, daß gar keine Umhüllung 28 verwendet wird.The casing 28 of the hollow element 32 has a very high air permeability of at least 10,000 ISO units; this desired, high air permeability can also be achieved in that no casing 28 is used at all.

Zur Verbindung des Filterteils 13 mit dem Strangteil 12 dient ein Belagpapier mit niedriger Luftdurchlässigkeit im Bereich von 20 bis 150 ISO-Einheiten, das gleichzeitig eine hohe Diffusion von Gasen mit geringem Molekulargewicht (z. B. CO) gewährleisten sollte.A covering paper with low air permeability in the range from 20 to 150 ISO units serves to connect the filter part 13 to the strand part 12, which paper should at the same time ensure a high diffusion of gases with a low molecular weight (eg CO).

Bei Bedarf kann auch der Filterteil 13 nach Fig. 2 mit einer Venti­lationszone 30 versehen werden, die sich etwa 2 bis 5 mm von mundseiti­gen Ende des Elementes 32 entfernt befindet und gewährleistet, daß der Filterteil 13 einen Ventilationsgrad von 5 bis 80 % hat.If required, the filter part 13 according to FIG. 2 can also be provided with a ventilation zone 30 which is located approximately 2 to 5 mm from the mouth end of the element 32 and ensures that the filter part 13 has a degree of ventilation of 5 to 80%.

Fig. 4 zeigt eine weitere Ausgestaltung des Filterteils 13, der in diesem Fall aus einem mundseitigen Filterelement 36 und einem strang­seitigen Kanalfilterelement 38 besteht.FIG. 4 shows a further embodiment of the filter part 13, which in this case consists of a mouth-side filter element 36 and a line-side channel filter element 38.

Das mundseitige Filterelement 36 hat eine Länge von 6 bis 24 mm, einen Durchmesser von 7 bis 9 mm, der dem Durchmesser des Strangteils 12 ent­spricht, und besteht aus einem Material mit den üblichen Filtereigen­schaften, vorzugsweise Zelluloseacetat.The mouth-side filter element 36 has a length of 6 to 24 mm, a diameter of 7 to 9 mm, which corresponds to the diameter of the strand part 12, and consists of a material with the usual filter properties, preferably cellulose acetate.

Das Filtermaterial des Filterelementes 36 hat einen spezifischen Zug­widerstand von vorzugsweise weniger als 150 Pa/cm.The filter material of the filter element 36 has a specific tensile resistance of preferably less than 150 Pa / cm.

Wenn das Filterelement 36 länger als 10 mm ist, kann eine Ventilations­zone 30 vorgesehen werden, die einen Ventilationsgrad von 5 bis 80 % garantiert. Die Ventilationszone sollte sich in einem Abstand von mindestens 10 mm vom mundseitigen Ende des Filterelementes 36 und damit des Filterteils 13 befinden, um auszuschließen, daß die Lippen des Rauchers die Ventilations-Perforationen verschließen können.If the filter element 36 is longer than 10 mm, a ventilation zone 30 can be provided which guarantees a degree of ventilation of 5 to 80%. The ventilation zone should be at a distance of at least 10 mm from the mouth end of the filter element 36 and thus of the filter part 13 in order to rule out that the smoker's lips can close the ventilation perforations.

Das strangseitige Kanalfilterelement 38 hat eine Länge von 10 bis 34 mm und weist ebenfalls Außenkanäle 34 auf, wie sie bei der Ausführungs­form nach Fig. 2 vorgesehen sind.The strand-side channel filter element 38 has a length of 10 to 34 mm and also has outer channels 34, as are provided in the embodiment according to FIG. 2.

Auch die Umhüllung 28 und das nicht dargestellte Belagpapier des Filterelementes 13 haben die in Bezug auf die Ausführungsform nach Fig. 2 beschriebenen Eigenschaften.The covering 28 and the covering paper (not shown) of the filter element 13 also have the properties described in relation to the embodiment according to FIG. 2.

Das strangseitige Kanalfilterelement 38 ist mit den üblichen Filter­materialien, insbesondere Zelluloseacetat, gefüllt, deren Spezifikation in Abhängigkeit von der Länge des Kanalfilterelementes 38 so ausgewählt wird, daß die aus dem Innenkern 14 des Strangteils 12 kommenden Rauch­partikel zu mindestens 95 % filtriert werden.The channel filter element 38 on the strand side is filled with the usual filter materials, in particular cellulose acetate, the specification of which is selected as a function of the length of the channel filter element 38 so that at least 95% of the smoke particles coming from the inner core 14 of the strand part 12 are filtered.

Claims (11)

1. Koaxiale Filtercigarette
a) mit einem Strangteil
a1) mit einem Innenkern aus einem weitgehend rückstandsfrei ver­glimmenden Material) insbesondere Tabak-Material,
a2) mit einer Umhüllung für den Innenkern
a3) mit einem den Innenkern bzw. seine Umhüllung koaxial umgebenden Außenmantel aus einem Tabak- und/oder Nicht-Tabakmaterial, und
a4) mit einer Umhüllung für den Außenmantel, und
b) mit einem Filterteil
gekennzeichnet durch die folgenden Merkmale:
c) die Zone der hauptsächlichen Wärmequelle befindet sich im Innen­kern (14) des Strangteils;
d) die Zone, in der der wesentliche Anteil des in den Mund des Rauchers gelangenden Aerosols erzeugt wird, befindet sich im Außenmantel (18) des Strangteils (12); und
e) der Filterteil (13) reduziert die aus dem Innenkern (14) des Strang­teils (12) stammenden Rauchpartikel weitgehend
f) während das im Außenmantel (18) des Strangteils (12) erzeugte Aerosol nur wenig oder gar nicht beeinflußt wird.1. Coaxial filter cigarette
a) with one strand part
a1) with an inner core made of a largely residue-free smoldering material), in particular tobacco material,
a2) with a covering for the inner core
a3) with an outer jacket made of a tobacco and / or non-tobacco material coaxially surrounding the inner core or its casing, and
a4) with a covering for the outer jacket, and
b) with a filter part
characterized by the following features:
c) the zone of the main heat source is in the inner core (14) of the strand part;
d) the zone in which the major part of the aerosol entering the smoker's mouth is generated is in the outer jacket (18) of the strand part (12); and
e) the filter part (13) largely reduces the smoke particles originating from the inner core (14) of the strand part (12)
f) while the aerosol generated in the outer jacket (18) of the strand part (12) is influenced only slightly or not at all. 2. Koaxiale Filtercigarette nach Anspruch 1, dadurch gekennzeichnet, daß der Innenkern (14) des Strangteils (12) Additive zur Steuerung der Verbrennung enthält.2. Coaxial filter cigarette according to claim 1, characterized in that the inner core (14) of the strand part (12) contains additives for controlling the combustion. 3. Koaxiale Filtercigarette nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß die Umhüllung (16) des Innenkerns (14) des Strang­teils (12) luftundurchlässig ist, jedoch mindestens einen Kanal zum An­saugen von Luft in den Innenkern (14) aufweist.3. Coaxial filter cigarette according to one of claims 1 or 2, characterized in that the covering (16) of the inner core (14) of the strand part (12) is impermeable to air, but has at least one channel for sucking air into the inner core (14). 4. Koaxiale Filtercigarette nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Außenmantel (18) des Strangteils (12) Additive zur Steuerung der thermischen Prozesse enthält.4. Coaxial filter cigarette according to one of claims 1 to 3, characterized in that the outer jacket (18) of the strand part (12) contains additives for controlling the thermal processes. 5. Koaxiale Filtercigarette nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Umhüllung (20) des Außenmantels (18) des Strangteils (12) eine sehr geringe Luftdurchlässigkeit von maximal 25 ISO-Einheiten hat.5. Coaxial filter cigarette according to one of claims 1 to 4, characterized in that the covering (20) of the outer casing (18) of the strand part (12) has a very low air permeability of at most 25 ISO units. 6. Koaxiale Filtercigarette nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Umhüllung (20) des Außenmantels (18) des Strangteils (12) Additive zur Steuerung der Verbrennung enthält.6. Coaxial filter cigarette according to one of claims 1 to 5, characterized in that the covering (20) of the outer casing (18) of the strand part (12) contains additives for controlling the combustion. 7. Koaxiale Filtercigarette nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der Filterteil (13) ein einziges, koaxiales Filter­element (15) mit einem Filterkern (22) mit einer luftundurchlässigen Umhüllung (24), dessen Filtrationsleistung für den in den Filterkern (22) einströmenden Rauch größer als 95 % ist, und einen Filtermantel (26) aufweist, dessen Filtrationsleistung für den einströmenden Rauch maximal 60 %, insbesondere 10 bis 30 % beträgt.7. Coaxial filter cigarette according to one of claims 1 to 6, characterized in that the filter part (13) has a single, coaxial filter element (15) with a filter core (22) with an air-impermeable envelope (24), the filtration performance of which in the filter core (22) incoming smoke is greater than 95%, and has a filter jacket (26), the filtration capacity for the incoming smoke is a maximum of 60%, in particular 10 to 30%. 8. Koaxiale Filtercigarette nach Anspruch 7, dadurch gekennzeichnet, daß zwischen dem koaxialen Filterelement (15) und dem Strangteil (12) ein strangseitiges Diffusions- und Ventilationselement (32) mit Außen­kanälen (34) angeordnet ist.8. Coaxial filter cigarette according to claim 7, characterized in that between the coaxial filter element (15) and the strand part (12) a strand-side diffusion and ventilation element (32) is arranged with outer channels (34). 9. Koaxiale Filtercigarette nach Anspruch 8, dadurch gekennzeichnet, daß der Filterteil (13) noch ein weiteres Zwischenelement mit Außen­kanälen und einem hohlen Innenrohr aufweist, dessen Durchmesser min­destens 1 mm kleiner als der Durchmesser des Filterkerns (22) ist.9. Coaxial filter cigarette according to claim 8, characterized in that the filter part (13) has yet another intermediate element with outer channels and a hollow inner tube, the diameter of which is at least 1 mm smaller than the diameter of the filter core (22). 10. Koaxiale Filtercigarette nach einem der Ansprüche 8 oder 9, dadurch gekennzeichnet, daß die Umhüllung (28) des Diffusions- und Ventila­tionselementes (32) eine sehr hohe Luftdurchlässigkeit hat.10. Coaxial filter cigarette according to one of claims 8 or 9, characterized in that the sheath (28) of the diffusion and ventilation element (32) has a very high air permeability. 11. Koaxiale Filtercigarette nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der Filterteil (13) ein mundseitiges Filterelement (36) mit einem spezifischen Zugwiderstand von vorzugsweise weniger als 150 Pa/cm und ein strangseitiges Kanalfilterelement (38) mit Außen­kanälen (34) aufweist.11. Coaxial filter cigarette according to one of claims 1 to 6, characterized in that the filter part (13) has a mouth-side filter element (36) with a specific tensile resistance of preferably less than 150 Pa / cm and a strand-side channel filter element (38) with outer channels (34 ) having.
EP89121849A 1989-01-17 1989-11-27 Coaxial filter cigarette Expired - Lifetime EP0378788B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89121849T ATE96288T1 (en) 1989-01-17 1989-11-27 COAXIAL FILTER CIGARETTE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3901226 1989-01-17
DE3901226A DE3901226C1 (en) 1989-01-17 1989-01-17

Publications (2)

Publication Number Publication Date
EP0378788A1 true EP0378788A1 (en) 1990-07-25
EP0378788B1 EP0378788B1 (en) 1993-10-27

Family

ID=6372241

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89121849A Expired - Lifetime EP0378788B1 (en) 1989-01-17 1989-11-27 Coaxial filter cigarette

Country Status (10)

Country Link
EP (1) EP0378788B1 (en)
JP (1) JP2594657B2 (en)
AT (1) ATE96288T1 (en)
AU (1) AU621451B2 (en)
CA (1) CA2007022C (en)
DE (2) DE3901226C1 (en)
DK (1) DK173403B1 (en)
FI (1) FI89552C (en)
HK (1) HK1005842A1 (en)
MY (1) MY105180A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0474940A1 (en) * 1990-08-24 1992-03-18 Philip Morris Products Inc. Concentric smoking filter having discrete tow and web filter media
EP0482568A1 (en) * 1990-10-23 1992-04-29 R.J. Reynolds Tobacco Company Cigarette
EP0503461A1 (en) * 1991-03-08 1992-09-16 British-American Tobacco (Germany) GmbH Coaxial cigarette
WO2005032285A1 (en) * 2003-09-30 2005-04-14 R. J. Reynolds Tobacco Company Smokable rod for a cigarette
US7503330B2 (en) 2003-09-30 2009-03-17 R.J. Reynolds Tobacco Company Smokable rod for a cigarette

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK172979B1 (en) * 1987-12-22 1999-11-01 Bat Cigarettenfab Gmbh Coaxial cigarette
US5365951A (en) * 1990-08-24 1994-11-22 Philip Morris Incorporated Concentric smoking filter having cellulose acetate tow periphery and carbon-particle-loaded web filter core
US5746230A (en) * 1990-08-24 1998-05-05 Philip Morris Incorporated Concentric smoking filter having discrete tow and web filter media
DE4107026C1 (en) * 1991-03-01 1992-03-12 H.F. & Ph.F. Reemtsma Gmbh & Co, 2000 Hamburg, De Individual cigarette making kit - has highly porous areas in paper and tobacco plug
DE4127420C2 (en) * 1991-08-19 1996-07-25 Bat Cigarettenfab Gmbh Coaxial filter cigarette
DE4321069C2 (en) * 1993-06-24 1998-09-10 Bat Cigarettenfab Gmbh Coaxial filter cigarette
DE59506078D1 (en) 1994-07-19 1999-07-08 Bat Cigarettenfab Gmbh Tobacco cartridge
DE19703003A1 (en) * 1997-01-28 1998-07-30 Bat Cigarettenfab Gmbh Cigarette with reduced staining and reduced sidestream smoke
DE19722812C2 (en) 1997-05-30 2003-02-13 Bat Cigarettenfab Gmbh Ultralight coaxial cigarette with multi-part filter
DE19757712C1 (en) * 1997-12-23 1999-06-24 Bat Cigarettenfab Gmbh Cross flow barrier coaxial cigarette and method of making a coaxial cigarette
US6345625B1 (en) 1997-12-06 2002-02-12 Kar Eng Chew Filter for secondary smoke and smoking articles incorporating the same
US11602164B2 (en) * 2019-03-14 2023-03-14 Rai Strategic Holdings, Inc. Aerosol delivery device with graded porosity from inner to outer wall surfaces

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US3356094A (en) * 1965-09-22 1967-12-05 Battelle Memorial Institute Smoking devices
US3614956A (en) * 1967-09-07 1971-10-26 Brown & Williamson Tobacco Smoking articles
DE2620335A1 (en) * 1976-05-07 1977-11-24 Brasec Gmbh Chemisch Physikali Cigarettes low in toxic smoke components - with empty central tube of air impermeable walls and filter tip
FR2452257A1 (en) * 1979-03-27 1980-10-24 Cigarette Components Ltd SMOKE FILTERS AND THEIR MANUFACTURING METHOD
GB2069310A (en) * 1980-02-20 1981-08-26 Molins Ltd Manufacture of cigarettes
FR2524274A1 (en) * 1982-04-05 1983-10-07 Filtrona Ltd CIGARETTE FILTER
DE3743597C1 (en) * 1987-12-22 1989-02-16 Bat Cigarettenfab Gmbh Coaxial cigarette

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FR1322254A (en) * 1962-02-14 1963-03-29 Double decker cigar and double decker cigarette
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US4219031A (en) * 1979-03-05 1980-08-26 Philip Morris Incorporated Smoking product having core of fibrillar carbonized matter
GB2070409A (en) * 1980-01-18 1981-09-09 British American Tobacco Co Filament, comprising smoke- modifying agent, in smoking article
GB8502651D0 (en) * 1985-02-01 1985-03-06 British American Tobacco Co Smoking articles
DK172979B1 (en) * 1987-12-22 1999-11-01 Bat Cigarettenfab Gmbh Coaxial cigarette

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Publication number Priority date Publication date Assignee Title
US3356094A (en) * 1965-09-22 1967-12-05 Battelle Memorial Institute Smoking devices
US3614956A (en) * 1967-09-07 1971-10-26 Brown & Williamson Tobacco Smoking articles
DE2620335A1 (en) * 1976-05-07 1977-11-24 Brasec Gmbh Chemisch Physikali Cigarettes low in toxic smoke components - with empty central tube of air impermeable walls and filter tip
FR2452257A1 (en) * 1979-03-27 1980-10-24 Cigarette Components Ltd SMOKE FILTERS AND THEIR MANUFACTURING METHOD
GB2069310A (en) * 1980-02-20 1981-08-26 Molins Ltd Manufacture of cigarettes
FR2524274A1 (en) * 1982-04-05 1983-10-07 Filtrona Ltd CIGARETTE FILTER
DE3743597C1 (en) * 1987-12-22 1989-02-16 Bat Cigarettenfab Gmbh Coaxial cigarette

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0474940A1 (en) * 1990-08-24 1992-03-18 Philip Morris Products Inc. Concentric smoking filter having discrete tow and web filter media
TR25717A (en) * 1990-08-24 1993-09-01 Philip Morris Productsinc CONCENTRIC CIGARETTE FILTER WITH SEPARATED KIT AND WEAVING FILTER MEDIA
EP0482568A1 (en) * 1990-10-23 1992-04-29 R.J. Reynolds Tobacco Company Cigarette
EP0503461A1 (en) * 1991-03-08 1992-09-16 British-American Tobacco (Germany) GmbH Coaxial cigarette
WO2005032285A1 (en) * 2003-09-30 2005-04-14 R. J. Reynolds Tobacco Company Smokable rod for a cigarette
US7503330B2 (en) 2003-09-30 2009-03-17 R.J. Reynolds Tobacco Company Smokable rod for a cigarette
US7753056B2 (en) 2003-09-30 2010-07-13 R. J. Reynolds Tobacco Company Smokable rod for a cigarette

Also Published As

Publication number Publication date
DK7390A (en) 1990-07-18
FI900155A0 (en) 1990-01-11
EP0378788B1 (en) 1993-10-27
MY105180A (en) 1994-08-30
DK173403B1 (en) 2000-09-25
DK7390D0 (en) 1990-01-11
DE58906030D1 (en) 1993-12-02
FI89552C (en) 1993-10-25
DE3901226C1 (en) 1990-07-26
CA2007022A1 (en) 1990-07-17
ATE96288T1 (en) 1993-11-15
JP2594657B2 (en) 1997-03-26
FI900155A (en) 1990-07-18
HK1005842A1 (en) 1999-01-29
AU4850190A (en) 1990-07-26
JPH02234661A (en) 1990-09-17
FI89552B (en) 1993-07-15
AU621451B2 (en) 1992-03-12
CA2007022C (en) 1996-09-03

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