EP0528186B1 - Coaxial filter cigarette - Google Patents

Coaxial filter cigarette Download PDF

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Publication number
EP0528186B1
EP0528186B1 EP92112342A EP92112342A EP0528186B1 EP 0528186 B1 EP0528186 B1 EP 0528186B1 EP 92112342 A EP92112342 A EP 92112342A EP 92112342 A EP92112342 A EP 92112342A EP 0528186 B1 EP0528186 B1 EP 0528186B1
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EP
European Patent Office
Prior art keywords
filter
inner core
coaxial
cigarette according
outer jacket
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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.)
Expired - Lifetime
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EP92112342A
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German (de)
French (fr)
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EP0528186A1 (en
Inventor
Werner Dr. Schneider
Bernd-Henrik Dr. Müller
Gert Dr. Rudolph
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British American Tobacco Germany GmbH
Original Assignee
British American Tobacco Germany GmbH
BAT Cigarettenfabriken GmbH
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Publication of EP0528186A1 publication Critical patent/EP0528186A1/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 ie 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, wherein the inner core consists 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 is known from DE-PS 37 43 597 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 covering, as well as a covering for the outer covering.
  • 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.
  • Another coaxial filter cigarette is known from DE-PS 39 01 226.
  • This also has a strand part and a filter part, the strand part containing an inner core made of a largely residue-free glowing material, an essentially air-impermeable sheathing, an outer sheath coaxially surrounding the inner core or its sheathing and a sheath for the outer sheath.
  • the filter part is designed as a coaxial filter with a filter core surrounded by an air-impermeable covering and a filter jacket.
  • the zone which is only required as a heat source and the zone in which the major part of the aerosol entering the smoker's mouth is generated are spatially separated. This essentially causes the smoke that enters the smoker's mouth to have a high proportion of flavor-relevant components and a very low proportion of undesirable ones Combustion products. Since the heat-generating zone is arranged in the inner core of the strand part, the combustion products are shielded by the outer jacket of the strand part and are therefore largely emitted via the main smoke, which can be used as one of several requirements for reducing the secondary smoke.
  • the mixture in the strand part generally delivers such large amounts of smoke that the coaxial filter element alone is not sufficient for filtering, diffusion and ventilation elements, optionally with further intermediate elements and outer channels, are additionally arranged between the filter element and the strand part.
  • claim 1 is based on the European patent application EP 0 365 882. This relates to a coaxial cigarette, which has a low CO yield even without a filter and a satisfactory smoke supply and is said to be reduced in the secondary smoke.
  • the invention is therefore based on the object to provide a coaxial filter cigarette of the type specified, in which the above disadvantages do not occur; in particular, a significant reduction in secondary smoke is made possible.
  • the advantages achieved with the invention are based on the fact that a larger proportion of the smoke produced is passed into the main smoke than in the known coaxial versions and than in normal lines. A large proportion of the smoke that usually comes into the secondary smoke after it is produced is therefore diverted into the main smoke even when using conventional cigarette paper, with the increased main smoke fraction then being filtered through a correspondingly more effective filter.
  • peripheral tobacco when choosing peripheral tobacco, one can now concentrate on minimizing precursors for irritating smoke substances.
  • 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 coaxial filter element 15 comprising 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.
  • the ventilation means is indicated as a line of punctiform ventilation openings 30, which also extend through the circumference of the coaxial filter element through the covering paper, not shown.
  • the coaxial strand part is used to generate smoke 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 has a diameter of 40 to 80%, preferably 60 to 70% of the outer diameter of the cigarette.
  • the material of the inner core 14 is designed with a packing density of 190 to 250 mg / cm 3 , preferably 210 to 230 mg / cm3. Additives for controlling the combustion are added to the material of the inner core 14 if necessary.
  • the material of the inner core is such that the tensile resistance per unit length, based on the packing density, is 0.09 to 0.15, preferably 0.1 to 0.12 (mm Ws) cm 2 / mg.
  • the envelope 16 of the inner core of the strand part 12 consists of paper, a film of tobacco material or another suitable material. Its air permeability is below 30 ISO units, preferably below 10 ISO units.
  • the outer jacket 18 coaxially surrounds the inner core or its sheath 16.
  • the material of the outer jacket 18 is designed with a packing density of 140 to 200 mg / cm 3 , preferably 150 to 180 mg / cm 3 .
  • the ratio of tensile resistance per unit length to packing density is 0.035 to 0.08, preferably 0.04 to 0.05 (mm Ws) cm 2 / mg.
  • the sheath 20 of the outer jacket 18 of the strand part 12 has an air permeability of less than 40 ISO units, preferably 15 to 25 ISO units; it consists of a cigarette paper, which can be a standard paper. Special papers can also be used to reduce secondary smoke.
  • the casing 20 of the outer casing 18 optionally 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 design of these segment perforations depends on the other materials used.
  • the coaxial filter 15 consists of a filter core 22 with a covering 24 and a filter jacket 26 with a covering 28.
  • the inner core 14 is filled with so-called fillers, that is to say with filling tobacco, generally of poor quality, and / or ribs. Tobacco foils are also suitable.
  • the sheath 16 of the inner core 14 is a paper or tobacco film with the air permeability described.
  • the outer casing 18 consists of aromatic tobacco, which essentially are responsible for the production of the flavor relevant aerosol. Otherwise, the design features stated above apply.
  • the filter core 22 has a diameter which is up to 2 mm larger than the diameter of the strand inner core, and has a degree of retention in the filter core of more than 90%, preferably more than 95%, with degrees of ventilation of 30 to 80% of the filter.
  • the main smoke is thus filtered in an advantageous manner.
  • the filter jacket 26, on the other hand, has a retention degree of less than 30%, so that the filtering of the flavor-relevant aerosol is less, which brings about a positive taste.
  • the degrees of retention relate to the total mass of the nicotine-free dry condensate flowing into the respective filter zone.
  • the filter core 22 and the filter jacket 26 As materials for the two filter zones, i.e. the filter core 22 and the filter jacket 26, the usual filter materials come into question, as are currently used in the cigarette industry.
  • the inner core consists of flavor-rich tobacco, while the outer jacket 18 of the tobacco rod 12 contains filling tobacco, ribs or tobacco foil.
  • the filter 15 is then constructed such that the filter core 22 has a smaller diameter than the inner core 14 and has a degree of retention of less than 30%.
  • the outer core accordingly has a retention rate of over 90%.
  • the main smoke condensate is usually determined according to the smoking standard, while the secondary smoke is collected during smoking and the condensate is determined.
  • the values determined show that with approximately the same total smoke condensate, ie from main and secondary smoke, the secondary smoke condensate of the cigarette according to the invention turns out to be approximately 20% less than that of the comparative sample.
  • the ratio of main smoke to secondary smoke condensate increases from 1.0 for the conventional comparative sample to 1.4 for the cigarette according to the invention. Nevertheless, the total volume of CO determined after smoking remains practically the same at 21 compared to 20 ml in the main smoke.
  • known ventilated mouthpieces or filters are also suitable for use with the tobacco strands specified above, which allow a filter ventilation degree of at least 40% and lead to a retention degree of at least 40% (based on those flowing into the filter Total mass of the nicotine-free dry condensate.)

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

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", ie 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, wherein the inner core consists 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 generation 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 ist aus der DE-PS 37 43 597 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 is known from DE-PS 37 43 597 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 covering, as well as a covering for the outer covering.

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.

Eine weitere koaxiale Filtercigarette ist aus der DE-PS 39 01 226 bekannt. Diese weist ebenfalls einen Strang- und einen Filterteil auf, wobei der Strangteil einen Innenkern aus einem weitgehend rückstandsfrei verglimmenden Material, eine im wesentlichen luftundurchlässige Umhüllung, einen den Innenkern bzw. seine Umhüllung koaxial umgebenden Außenmantel sowie eine Umhüllung für den Außenmantel enthält. Der Filterteil ist als Koaxialfilter mit einem von einer luftundurchlässigen Umhüllung umgebenen Filterkern und einem Filtermantel ausgebildet.Another coaxial filter cigarette is known from DE-PS 39 01 226. This also has a strand part and a filter part, the strand part containing an inner core made of a largely residue-free glowing material, an essentially air-impermeable sheathing, an outer sheath coaxially surrounding the inner core or its sheathing and a sheath for the outer sheath. The filter part is designed as a coaxial filter with a filter core surrounded by an air-impermeable covering and a filter jacket.

Die nur als Wärmequelle benötigte Zone und die Zone, in welcher der wesentliche Teil des in den Mund des Rauchers gelangenden Aerosols erzeugt wird, sind räumlich getrennt. Dadurch wird im wesentlichen bewirkt, daß der in den Mund des Rauchers gelangende Rauch einen hohen Anteil an geschmacklich relevanten Komponenten und einen sehr geringen Anteil an unerwünschten Verbrennungsprodukten hat. Da die die Wärme erzeugende Zone im Innenkern des Strangteils angeordnet ist, werden die Verbrennungsprodukte durch den Außenmantel des Strangteils abgeschirmt und damit weitgehend über den Hauptrauch abgegeben, was als eine von mehreren Voraussetzungen für die Verringerung des Nebenrauches genutzt werden kann.The zone which is only required as a heat source and the zone in which the major part of the aerosol entering the smoker's mouth is generated are spatially separated. This essentially causes the smoke that enters the smoker's mouth to have a high proportion of flavor-relevant components and a very low proportion of undesirable ones Combustion products. Since the heat-generating zone is arranged in the inner core of the strand part, the combustion products are shielded by the outer jacket of the strand part and are therefore largely emitted via the main smoke, which can be used as one of several requirements for reducing the secondary smoke.

Da jedoch die Mischung im Strangteil in der Regel so große Rauchmengen liefert, daß das koaxiale Filterelement allein zum Abfiltern nicht ausreicht, werden zusätzlich zwischen Filterelement und Strangteil Diffusions- und Ventilationselemente, gegebenenfalls mit weiteren Zwischenelementen und Außenkanälen, angeordnet.However, since the mixture in the strand part generally delivers such large amounts of smoke that the coaxial filter element alone is not sufficient for filtering, diffusion and ventilation elements, optionally with further intermediate elements and outer channels, are additionally arranged between the filter element and the strand part.

Gemeinsam ist diesen beiden vorbekannten koaxialen Filtercigaretten, daß eine deutliche Nebenrauchverringerung nur durch die Verwendung von Spezialpapieren bewirkt werden kann, speziell durch Cigarettenpapiere sehr niedriger Luftdurchlässigkeit und mit speziellen Additiven. Damit weist jedoch der Hauptrauch zwangsläufig durch die Verbrennung dieser Spezialpapiere einen unerwünscht hohen Kohlenmonoxidgehalt auf, der durch die bekannten Anordnungen nur mangelhaft reduziert werden kann. Dieser Umstand begrenzt die Möglichkeit der Nebenrauchreduzierung.What these two previously known coaxial filter cigarettes have in common is that a significant reduction in secondary smoke can only be achieved by using special papers, especially by cigarette papers with very low air permeability and with special additives. However, the main smoke inevitably has an undesirably high carbon monoxide content due to the combustion of these special papers, which can only be reduced inadequately by the known arrangements. This fact limits the possibility of reducing secondary smoke.

Gemäß seinem Oberbegriff geht der Patentanspruch 1 von der europäischen Patentanmeldung EP 0 365 882 aus. Diese betrifft eine koaxiale Cigarette, die auch ohne Filter bei befriedigendem Rauchangebot eine niedrige CO-Ausbeute hat und dabei im Nebenrauch vermindert sein soll.According to its preamble, claim 1 is based on the European patent application EP 0 365 882. This relates to a coaxial cigarette, which has a low CO yield even without a filter and a satisfactory smoke supply and is said to be reduced in the secondary smoke.

In dieser Schrift wird zwar schon vorgeschlagen, daß die Packungsdichte des Innenkerns größer sein soll als diejenige des Außenmantels, jedoch wird sich diese Eigenschaft auf den Wert des Zugwiderstandes pro Längeneinheit bezogen auf die Packungsdichte bezüglich des Innenkerns so auswirken, daß dieser Quotient bei großen Packungsdichten insgesamt kleiner wird. Auf den Außenmantel bezogen wird sich bei großen Packungsdichten der Quotient "Zugwiderstand pro Längeneinheit bezogen auf die Packungsdichte" mit kleineren Packungsdichten insgesamt im Wert vergrößern. Soll also der Zugwiderstand pro Längeneinheit bezogen auf die Packungsdichte im Innenkern größer als im Außenmantel sein, so muß insbesondere bei sehr großen Werten für die Packungsdichte des Innenkerns und sehr kleinen Werten für die Packungsdichte des Außenkerns der Zugwiderstand pro Längeneinheit im Innenkern sehr hoch eingestellt werden, während der Zugwiderstand pro Längeneinheit im Außenkern sehr niedrig anzusetzen ist. Nachteiligerweise findet sich in dieser gattungsgemäßen Schrift kein Hinweis auf eine solche Einstellung des Zugwiderstandes.Although this document already suggests that the packing density of the inner core should be greater than that of the outer jacket, this property will have an effect on the value of the tensile resistance per unit length in relation to the packing density with respect to the inner core so that this quotient for large packing densities overall gets smaller. In relation to the outer jacket, the quotient "tensile resistance per unit length in relation to the packing density" will increase in total with smaller packing densities. Thus, if the tensile resistance per unit length in relation to the packing density in the inner core should be greater than in the outer jacket, the tensile resistance per unit length in the inner core must be set very high, in particular for very large values for the packing density of the inner core and very small values for the packing density of the outer core. while the tensile resistance per unit length in the outer core is very low. Disadvantageously, there is no indication of such an adjustment of the train resistance in this generic document.

Der Erfindung liegt daher die Aufgabe zugrunde, eine koaxiale Filtercigarette der angegebenen Gattung zu schaffen, bei der die obigen Nachteile nicht auftreten; insbesondere eine erhebliche Reduzierung des Nebenrauches ermöglicht wird.The invention is therefore based on the object to provide a coaxial filter cigarette of the type specified, in which the above disadvantages do not occur; in particular, a significant reduction in secondary smoke is made possible.

Dies wird erfindungsgemäß durch die kennzeichnenden Merkmale des Patentanspruches 1 erreicht.This is achieved according to the invention by the characterizing features of patent claim 1.

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

Die mit der Erfindung erzielten Vorteile beruhen darauf, daß ein größerer Anteil des entstehenden Rauches als bei den bekannten Koaxialversionen und als bei normalen Strängen in den Hauptrauch geleitet wird. Ein großer Anteil des üblicherweise nach seiner Entstehung in den Nebenrauch gelangenden Rauches wird also auch bei Verwendung eines konventionellen Cigarettenpapiers in den Hauptrauch umgelenkt, wobei anschließend eine Filtration des erhöhten Hauptrauchanteils durch einen entsprechend wirksameren Filter durchgeführt wird.The advantages achieved with the invention are based on the fact that a larger proportion of the smoke produced is passed into the main smoke than in the known coaxial versions and than in normal lines. A large proportion of the smoke that usually comes into the secondary smoke after it is produced is therefore diverted into the main smoke even when using conventional cigarette paper, with the increased main smoke fraction then being filtered through a correspondingly more effective filter.

Unabhängig davon, ob die Zone hauptsächlicher Wärmeerzeugung im Innenkern oder im Außenmantel, und entsprechend die Zone der Aerosolerzeugung im Außenmantel bzw. Innenkern angeordnet sind, wird im Gegensatz zu den bekannten Maßnahmen eine Rauchumverteilung vom Nebenrauch in den Hauptrauch allein durch die Ausprägungen des speziellen koaxialen Strangtyps gewährleistet. Dabei kann auf spezielle Cigarettenpapiere, insbesondere Cigarettenpapiere sehr niedriger Luftdurchlässigkeit und mit Additiven zur Nebenrauchverminderung, verzichtet werden, wodurch auch die dadurch bedingte Erhöhung des Kohlenmonoxidgehaltes im Hauptrauch vermieden wird.Regardless of whether the zone of main heat generation in the inner core or in the outer jacket, and correspondingly the zone of aerosol generation in the outer jacket or inner core, are arranged, in contrast to the known measures, a smoke redistribution from secondary smoke into the main smoke is solely due to the characteristics of the special coaxial strand type guaranteed. Special cigarette papers, in particular cigarette papers with very low air permeability and with additives for reducing secondary smoke, can be dispensed with, which also avoids the consequent increase in the carbon monoxide content in the main smoke.

Letztlich ist durch den erfindungsgemäßen Aufbau der koaxialen Filtercigarette nicht nur die Quantität, sondern auch die Qualität des Nebenrauches steuerbar. Diese Steuerung ist von der die Qualität des Hauptrauches bestimmenden Mischung in großem Maße unabhängig, wie dies bei bisher bekannten nebenrauchreduzierenden Lösungen nicht möglich war.Ultimately, not only the quantity but also the quality of the secondary smoke can be controlled by the structure of the coaxial filter cigarette according to the invention. This control is largely independent of the mixture determining the quality of the main smoke, as was not possible with previously known secondary smoke-reducing solutions.

Beispielsweise kann man sich nunmehr bei der Wahl des peripheren Tabaks bevorzugt auf die Minimierung von Precursorn für irritierende Rauchinhaltsstoffe konzentrieren.For example, when choosing peripheral tobacco, one can now concentrate on minimizing precursors for irritating smoke substances.

Die Erfindung wird im folgenden anhand von Ausführungsbeispielen unter Bezugnahme auf die beiliegende schematische Zeichnung näher erläutert, deren einzige Figur einen axialen Schnitt durch eine koaxiale Filtercigarette zeigt.The invention is described below using exemplary embodiments with reference to the accompanying schematic Drawing explained in more detail, the only figure shows an axial section through a coaxial filter cigarette.

Die aus der 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.

Der Filterteil 13 weist ein koaxiales Filterelement 15 aus einem Filterkern 22 mit einer Umhüllung 24 und einem Filtermantel 26 mit einer Umhüllung 28 auf.The filter part 13 has a coaxial filter element 15 comprising a filter core 22 with a covering 24 and a filter jacket 26 with a covering 28.

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

Der koaxiale Strangteil dient zur Raucherzeugung 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 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 hat einen Durchmesser von 40 bis 80 %, vorzugsweise 60 bis 70 % des Außendurchmessers der Cigarette. Das Material des Innenkerns 14 ist mit einer Packungsdichte von 190 bis 250 mg/cm3, vorzugsweise 210 bis 230 mg/cm3 ausgelegt. Dem Material des Innenkerns 14 werden bei Bedarf Additive zur Steuerung der Verbrennung zugesetzt. Das Material des Innenkerns ist derart, daß der Zugwiderstand pro Längeneinheit, bezogen auf die Packungsdichte, 0.09 bis 0.15, vorzugsweise 0.1 bis 0.12 (mm Ws) cm2/mg beträgt.The inner core 14 of the strand part has a diameter of 40 to 80%, preferably 60 to 70% of the outer diameter of the cigarette. The material of the inner core 14 is designed with a packing density of 190 to 250 mg / cm 3 , preferably 210 to 230 mg / cm3. Additives for controlling the combustion are added to the material of the inner core 14 if necessary. The material of the inner core is such that the tensile resistance per unit length, based on the packing density, is 0.09 to 0.15, preferably 0.1 to 0.12 (mm Ws) cm 2 / mg.

Die Umhüllung 16 des Innenkerns des Strangteils 12 besteht aus Papier, aus einer Folie aus Tabakmaterial oder einem anderen, geeigneten Material. Seine Luftdurchlässigkeit liegt unter 30 ISO-Einheiten, vorzugsweise unter 10 ISO-Einheiten.The envelope 16 of the inner core of the strand part 12 consists of paper, a film of tobacco material or another suitable material. Its air permeability is below 30 ISO units, preferably below 10 ISO units.

Der Außenmantel 18 umgibt den Innenkern bzw. dessen Umhüllung 16 koaxial. Das Material des Außenmantels 18 ist mit einer Packungsdichte von 140 bis 200 mg/cm3, vorzugsweise 150 bis 180 mg/cm3 ausgelegt. Das Verhältnis von Zugwiderstand pro Längeneinheit zur Packungsdichte beträgt 0.035 bis 0.08, vorzugsweise 0.04 bis 0.05 (mm Ws) cm2/mg.The outer jacket 18 coaxially surrounds the inner core or its sheath 16. The material of the outer jacket 18 is designed with a packing density of 140 to 200 mg / cm 3 , preferably 150 to 180 mg / cm 3 . The ratio of tensile resistance per unit length to packing density is 0.035 to 0.08, preferably 0.04 to 0.05 (mm Ws) cm 2 / mg.

Die Umhüllung 20 des Außenmantels 18 des Strangteils 12 hat eine Luftdurchlässigkeit von weniger als 40 ISO-Einheiten, vorzugsweise 15 bis 25 ISO-Einheiten; sie besteht aus einem Cigarettenpapier, welches ein Standardpapier sein kann. Es können auch Spezialpapiere zur Reduzierung des Nebenrauches verwendet werden. Die Umhüllung 20 des Außenmantels 18 enthält gegebenenfalls Additive zur Steuerung der Verbrennung.The sheath 20 of the outer jacket 18 of the strand part 12 has an air permeability of less than 40 ISO units, preferably 15 to 25 ISO units; it consists of a cigarette paper, which can be a standard paper. Special papers can also be used to reduce secondary smoke. The casing 20 of the outer casing 18 optionally contains additives for controlling the combustion.

Gegebenenfalls kann die äußere Umhüllung 20 des Außenmantels 18 des Strangteils 12 mit Segmentperforationen zur Steuerung des Temperaturgradienten im Außenmantel 18 versehen sein; die Verwendung und/oder die Ausgestaltung dieser Segmentperforationen hängt von den sonstigen verwendeten Materialien ab.Optionally, 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 design of these segment perforations depends on the other materials used.

Ähnlich wie der Strangteil 12 besteht der Koaxialfilter 15 aus einem Filterkern 22 mit einer Umhüllung 24 und einem Filtermantel 26 mit einer Umhüllung 28.Similar to the strand part 12, the coaxial filter 15 consists of a filter core 22 with a covering 24 and a filter jacket 26 with a covering 28.

Bei einem ersten Ausführungsbeispiel ist der Innenkern 14 mit sogenannten Fillern gefüllt, d.h. mit Fülltabaken, in der Regel minderer Qualität, und/oder Rippen. Auch Tabakfolien sind geeignet. Die Umhüllung 16 des Innenkerns 14 ist eine Papier- oder Tabakfolie mit der beschriebenen Luftdurchlässigkeit. Der Außenmantel 18 besteht aus aromareichen Tabaken, die im wesentlichen für die Erzeugung des geschmacklich relevanten Aerosols verantwortlich sind. Im übrigen gelten die oben ausgeführten Ausgestaltungsmerkmale.In a first embodiment, the inner core 14 is filled with so-called fillers, that is to say with filling tobacco, generally of poor quality, and / or ribs. Tobacco foils are also suitable. The sheath 16 of the inner core 14 is a paper or tobacco film with the air permeability described. The outer casing 18 consists of aromatic tobacco, which essentially are responsible for the production of the flavor relevant aerosol. Otherwise, the design features stated above apply.

Der Filterkern 22 weist einen Durchmesser auf, der bis zu 2 mm größer als der Durchmesser des Strang-Innenkerns ist, und hat bei Ventilationsgraden von 30 bis 80 % des Filters einen Retentionsgrad im Filterkern von über 90 %, vorzugsweise über 95 %. Damit wird der Hauptrauch in vorteilhafter Weise gefiltert. Der Filtermantel 26 hingegen weist einen Retentionsgrad von unter 30 % auf, so daß die Filterung des geschmacklich relevanten Aerosols geringer ist, was einen positiven Geschmack bewirkt. Die Retentionsgrade beziehen sich auf die Gesamtmasse des in die jeweilige Filterzone einströmenden nicotinfreien Trockenkondensats.The filter core 22 has a diameter which is up to 2 mm larger than the diameter of the strand inner core, and has a degree of retention in the filter core of more than 90%, preferably more than 95%, with degrees of ventilation of 30 to 80% of the filter. The main smoke is thus filtered in an advantageous manner. The filter jacket 26, on the other hand, has a retention degree of less than 30%, so that the filtering of the flavor-relevant aerosol is less, which brings about a positive taste. The degrees of retention relate to the total mass of the nicotine-free dry condensate flowing into the respective filter zone.

Als Materialien für die beiden Filterzonen, d.h. den Filterkern 22 und den Filtermantel 26, kommen die üblichen Filtermaterialien in Frage, wie sie derzeit in der Cigarettenindustrie eingesetzt werden.As materials for the two filter zones, i.e. the filter core 22 and the filter jacket 26, the usual filter materials come into question, as are currently used in the cigarette industry.

Bei einem zweiten Ausführungsbeispiel besteht der Innenkern aus aromareichen Tabaken, während der Außenmantel 18 des Tabakstrangs 12 Fülltabake, Rippen bzw. Tabakfolie enthält. Hierfür können z.B. flue cured Tabake unterer Blattstände verwendet werden. Der Filter 15 ist dann so aufgebaut, daß der Filterkern 22 einen geringeren Durchmesser als der Innenkern 14 aufweist und einen Retentionsgrad von unter 30 % hat. Der Außenkern hat entsprechend einen Retentionsgrad von über 90 %.In a second exemplary embodiment, the inner core consists of flavor-rich tobacco, while the outer jacket 18 of the tobacco rod 12 contains filling tobacco, ribs or tobacco foil. For this, e.g. flue cured tobacco lower leaf stands are used. The filter 15 is then constructed such that the filter core 22 has a smaller diameter than the inner core 14 and has a degree of retention of less than 30%. The outer core accordingly has a retention rate of over 90%.

Der Effekt der Erfindung gegenüber herkömmlichen Cigaretten wird anhand eines Beispiels erläutert. Im Beispiel wurde eine gemäß obigen Spezifikationen gefertigte koaxiale Cigarette, die filterlos ausgebildet wurde, mit einer normalen filterlosen Cigarette verglichen. Dies deshalb, da die Erfindung nicht primär Filtereffekte, sondern eine besondere koaxiale Struktur im Strangteil betrifft, durch welche die Umverteilung vom Nebenrauch in den Hauptrauch realisiert wird. Dabei wurden folgende Spezifikationen eingehalten und folgende Werte gemessen:

Figure imgb0001
Figure imgb0002
 The effect of the invention over conventional cigarettes is explained using an example. In the example, a coaxial cigarette manufactured according to the above specifications, which was made filterless, was compared with a normal filterless cigarette. This is because the invention is not primarily filter effects, but a special coaxial structure in the Part of the line concerns through which the redistribution from secondary smoke to main smoke is realized. The following specifications were observed and the following values measured:
Figure imgb0001
Figure imgb0002

Das Hauptrauchkondensat wird dabei üblicherweise nach der Abrauchnorm ermittelt, während der Nebenrauch während des Abrauchens aufgefangen und das Kondensat bestimmt wird. Die ermittelten Werte zeigen, daß bei etwa gleichem Gesamtrauchkondensat, also aus Haupt- und Nebenrauch, das Nebenrauchkondensat der erfindungsgemäßen Cigarette ca. 20 % geringer als das der Vergleichsprobe ausfällt. Dabei erhöht sich das Verhältnis Hauptrauch- zu Nebenrauch-kondensat von 1,0 für die konventionolle Vergleichsprobe auf 1,4 für die erfindungsgemäße Cigarette. Trotzdem bleibt das nach dem Abrauchen bestimmte Gesamtvolumen von CO mit 21 im Vergleich zu 20 ml im Hauptrauch praktisch gleich.The main smoke condensate is usually determined according to the smoking standard, while the secondary smoke is collected during smoking and the condensate is determined. The values determined show that with approximately the same total smoke condensate, ie from main and secondary smoke, the secondary smoke condensate of the cigarette according to the invention turns out to be approximately 20% less than that of the comparative sample. The ratio of main smoke to secondary smoke condensate increases from 1.0 for the conventional comparative sample to 1.4 for the cigarette according to the invention. Nevertheless, the total volume of CO determined after smoking remains practically the same at 21 compared to 20 ml in the main smoke.

Obwohl Koaxialfilter mit den angegebenen Spezifikationen besonders bevorzugt sind, eignen sich zur Verwendung mit den oben spezifizierten Tabaksträngen auch bekannte ventilierte Mundstücke oder Filter, die einen Filterventilationsgrad von mindestens 40% ermöglichen und zu einem Retentionsgrad von mindestens 40% führen (bezogen auf in den Filter einströmende Gesamtmasse des nicotinfreien Trockenkondensats.)Although coaxial filters with the specified specifications are particularly preferred, known ventilated mouthpieces or filters are also suitable for use with the tobacco strands specified above, which allow a filter ventilation degree of at least 40% and lead to a retention degree of at least 40% (based on those flowing into the filter Total mass of the nicotine-free dry condensate.)

Claims (17)

  1. A coaxial filter cigarette,
    a) comprising a rod portion
    a1) having an inner core of a tobacco and/or non-tobacco material smouldering substantially without residue,
    a2) a sheath for the inner core,
    a3) an outer jacket of a tobacco and/or non-tobacco material surrounding the inner core and/or its sheath, and
    a4) a sheath for the outer jacket, and
    b) comprising a filter portion, with
    c) the inner core (14) having a diameter that amounts to 45 to 80% of the outer diameter of the filter cigarette (10), and
    d) the packing density of the inner core (14) being greater than the packing density of the outer jacket (18), characterized in that
    e) the draw resistance per length unit with respect to the packing density is greater in the inner core (14) than in the outer jacket (18), that
    f) the air permeability of the sheath (16) of the inner core (14) is less than the air permeability of the sheath (20) of the outer jacket (18), and that
    g) the filter portion (13) has a filter ventilation degree of at least 30% and a retention degree of at least 40%.
  2. A coaxial filter cigarette according to claim 1, characterized in that the inner core (14) has a packing density of 190 to 250 mg/cm3.
  3. A coaxial cigarette according to any of claims 1 to 2, characterized in that the draw resistance per length unit with respect to the packing density is 0.09 to 0.15 (mm R) cm2/mg in the inner core (14).
  4. A coaxial cigarette according to any of claims 1 to 3, characterized in that the inner core (14) of the rod portion (12) contains additives used for controlling the thermal processes.
  5. A coaxial cigarette according to any of claims 1 to 4, characterized in that the sheath (16) of the inner core (14) has an air permeability of less than 30 ISO units.
  6. A coaxial cigarette according to any of claims 1 to 5, characterized in that the packing density of the outer jacket (18) is 140 to 200 mg/cm3.
  7. A coaxial cigarette according to any of claims 1 to 6, characterized in that the draw resistance per length unit with respect to the packing density is 0.035 to 0.08 (mm R) cm2/mg in the outer jacket (18).
  8. A coaxial cigarette according to any of claims 1 to 7, characterized in that the outer jacket (18) of the rod portion (12) contains additives used for controlling the thermal processes.
  9. A coaxial cigarette according to any of claims 1 to 8, characterized in that the sheath (20) of the outer jacket (18) has an air permeability of less than 40 ISO units.
  10. A coaxial cigarette according to any of claims 1 to 9, characterized in that the sheath (20) of the outer jacket (18) of the rod portion (12) contains additives for controlling the thermal processes.
  11. A coaxial cigarette according to any of claims 1 to 10, characterized in that a coaxial filter portion (13) with a filter core (22), the inner diameter of which is approximately equal to the diameter of inner core (14) of the rod portion (12), and with a filter jacket (26) is provided.
  12. A coaxial cigarette according to any of claims 1 to 11, characterized in that the inner core (14) consists of aroma-rich tobaccos, and the outer jacket (18) consists of fillers.
  13. A coaxial cigarette according to any of claims 11 or 12, characterized in that, at ventilation degrees of 30 to 80%, the filter portion (13) results in respective retention degrees of less than 30% in the filter core (22) and more than 90% in the filter jacket (26).
  14. A coaxial cigarette according to any of claims 11 to 13, characterized in that the inner diameter of the filter core (22) is slightly less than the inner diameter of the inner core (14).
  15. A coaxial cigarette according to any of claims 1 to 11, characterized in that the inner core (14) consists of fillers, and the outer jacket (18) consists of aromarich tobaccos.
  16. A coaxial cigarette according to claim 15, characterized in that, at ventilation degrees of 30 to 80%, the filter portion (13) results in respective retention degrees of more than 90% in the filter core (22) and less than 30% in the filter jacket (26).
  17. A coaxial cigarette according to claim 16, characterized in that the inner diameter of the filter core (22) is slightly larger than the inner diameter of the inner core (14).
EP92112342A 1991-08-19 1992-07-20 Coaxial filter cigarette Expired - Lifetime EP0528186B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4127420 1991-08-19
DE4127420A DE4127420C2 (en) 1991-08-19 1991-08-19 Coaxial filter cigarette

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EP0528186A1 EP0528186A1 (en) 1993-02-24
EP0528186B1 true EP0528186B1 (en) 1996-09-04

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US (1) US5379789A (en)
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CA (1) CA2074300C (en)
DE (2) DE4127420C2 (en)
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HK (1) HK1005840A1 (en)

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DE4321069C2 (en) * 1993-06-24 1998-09-10 Bat Cigarettenfab Gmbh Coaxial filter cigarette
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DE19703003A1 (en) 1997-01-28 1998-07-30 Bat Cigarettenfab Gmbh Cigarette with reduced staining and reduced sidestream smoke
DE19718296B4 (en) * 1997-04-30 2006-06-29 British American Tobacco (Germany) Gmbh Ventilated filter cigarette with a coaxial filter element
DE19722812C2 (en) * 1997-05-30 2003-02-13 Bat Cigarettenfab Gmbh Ultralight coaxial cigarette with multi-part filter
GB9712815D0 (en) * 1997-06-19 1997-08-20 British American Tobacco Co Smoking article and smoking material therefor
DE19757712C1 (en) * 1997-12-23 1999-06-24 Bat Cigarettenfab Gmbh Cross flow barrier coaxial cigarette and method of making a coaxial cigarette
DE19746664A1 (en) * 1997-10-23 1999-05-06 Reemtsma H F & Ph Thin cigarette
PT1449447E (en) 2001-11-05 2012-04-26 Japan Tobacco Inc Low ignition propensity cigarette
US20050066986A1 (en) * 2003-09-30 2005-03-31 Nestor Timothy Brian Smokable rod for a cigarette
US7503330B2 (en) * 2003-09-30 2009-03-17 R.J. Reynolds Tobacco Company Smokable rod for a cigarette
CN101991189B (en) * 2010-11-26 2013-02-20 云南瑞升烟草技术（集团）有限公司 Harm-reduction tar-reduction cigarette with shaft core
SG11201801514TA (en) * 2015-11-12 2018-05-30 Philip Morris Products Sa Multicomponent aerosol-forming article

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HK1005840A1 (en) 1999-01-29
DE59207041D1 (en) 1996-10-10
CA2074300A1 (en) 1993-02-20
CA2074300C (en) 2001-07-17
ES2093743T3 (en) 1997-01-01
US5379789A (en) 1995-01-10
DE4127420C2 (en) 1996-07-25
DE4127420A1 (en) 1993-02-25

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