EP0378788B1 - Koaxiale Filtercigarette - Google Patents

Koaxiale Filtercigarette Download PDF

Info

Publication number
EP0378788B1
EP0378788B1 EP89121849A EP89121849A EP0378788B1 EP 0378788 B1 EP0378788 B1 EP 0378788B1 EP 89121849 A EP89121849 A EP 89121849A EP 89121849 A EP89121849 A EP 89121849A EP 0378788 B1 EP0378788 B1 EP 0378788B1
Authority
EP
European Patent Office
Prior art keywords
filter
inner core
coaxial
wrapper
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.)
Expired - Lifetime
Application number
EP89121849A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0378788A1 (de
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
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
British American Tobacco Germany GmbH
Original Assignee
BAT Cigarettenfabriken GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by BAT Cigarettenfabriken GmbH filed Critical BAT Cigarettenfabriken GmbH
Priority to AT89121849T priority Critical patent/ATE96288T1/de
Publication of EP0378788A1 publication Critical patent/EP0378788A1/de
Application granted granted Critical
Publication of EP0378788B1 publication Critical patent/EP0378788B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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 described in the not previously published German patent application P 37 43 597.3-23 dated 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 constructed in such a way that the smoke particles originating from the inner core of the strand part are largely reduced, at least to 95%, while the aerosol generated in the outer jacket of the strand part is reduced only slightly or not at all, namely only to 0 to 60 % is reduced.
  • 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.
  • a relatively simple, coaxial filter element with a suitable covering and an associated covering paper can be used.
  • 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 taking place in the inner core of the strand part, while the filter element combined therewith intercepts the smoke particles originating from the inner core of the strand part and those in the outer jacket of the strand part resulting aerosols are practically not affected.
  • 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 that decompose when heat is added (and / or of materials that 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 is 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 strand-side channel filter element 38 is filled with the usual filter materials, in particular cellulose acetate, the specification of which is selected depending on 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.

Landscapes

  • Cigarettes, Filters, And Manufacturing Of Filters (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)
  • Networks Using Active Elements (AREA)
EP89121849A 1989-01-17 1989-11-27 Koaxiale Filtercigarette Expired - Lifetime EP0378788B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89121849T ATE96288T1 (de) 1989-01-17 1989-11-27 Koaxiale filtercigarette.

Applications Claiming Priority (2)

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

Publications (2)

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

Family

ID=6372241

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89121849A Expired - Lifetime EP0378788B1 (de) 1989-01-17 1989-11-27 Koaxiale Filtercigarette

Country Status (10)

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

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MY103663A (en) * 1987-12-22 1993-08-28 Bat Cigarettenfab Gmbh Coaxial cigarette.
US5746230A (en) * 1990-08-24 1998-05-05 Philip Morris Incorporated Concentric smoking filter having discrete tow and web filter media
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
AU635095B2 (en) * 1990-08-24 1993-03-11 Philip Morris Products Inc. Concentric smoking filter having discrete tow and web filter media
US5105838A (en) * 1990-10-23 1992-04-21 R.J. Reynolds Tobacco Company Cigarette
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
DE4107522C2 (de) * 1991-03-08 1994-02-17 Bat Cigarettenfab Gmbh Koaxialcigarette
DE4127420C2 (de) * 1991-08-19 1996-07-25 Bat Cigarettenfab Gmbh Koaxiale Filtercigarette
DE4321069C2 (de) * 1993-06-24 1998-09-10 Bat Cigarettenfab Gmbh Koaxiale Filtercigarette
DE59506078D1 (de) 1994-07-19 1999-07-08 Bat Cigarettenfab Gmbh Tabakpatrone
DE19703003A1 (de) 1997-01-28 1998-07-30 Bat Cigarettenfab Gmbh Cigarette mit reduzierter Fleckenbildung und vermindertem Nebenstromrauch
DE19722812C2 (de) 1997-05-30 2003-02-13 Bat Cigarettenfab Gmbh Ultraleicht-Koaxialcigarette mit mehrteiligem Filter
DE19757712C1 (de) * 1997-12-23 1999-06-24 Bat Cigarettenfab Gmbh Koaxialcigarette mit Querstromsperre und Verfahren zur Herstellung einer Koaxialcigarette
US6345625B1 (en) 1997-12-06 2002-02-12 Kar Eng Chew Filter for secondary smoke and smoking articles incorporating the same
EP1670326B1 (en) * 2003-09-30 2007-02-21 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
US11602164B2 (en) * 2019-03-14 2023-03-14 Rai Strategic Holdings, Inc. Aerosol delivery device with graded porosity from inner to outer wall surfaces

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR998556A (fr) * 1945-10-29 1952-01-21 Papeteries De Mauduit Sa Des Cigarette
FR1322254A (fr) * 1962-02-14 1963-03-29 Cigare à deux étages et cigarette à deux étages
US3356094A (en) * 1965-09-22 1967-12-05 Battelle Memorial Institute Smoking devices
GB1086443A (en) * 1966-05-03 1967-10-11 James Alexander Everet Bell Cigarette
GB1228747A (da) * 1967-09-07 1971-04-15
DE2620335A1 (de) * 1976-05-07 1977-11-24 Brasec Gmbh Chemisch Physikali Schadstoffarme tabakwaren
US4219031A (en) * 1979-03-05 1980-08-26 Philip Morris Incorporated Smoking product having core of fibrillar carbonized matter
US4291711A (en) * 1979-03-27 1981-09-29 American Filtrona Corporation Tobacco smoke filter providing tobacco flavor enrichment, and method for producing same
GB2070409A (en) * 1980-01-18 1981-09-09 British American Tobacco Co Filament, comprising smoke- modifying agent, in smoking article
GB2069310B (en) * 1980-02-20 1983-09-14 Molins Ltd Manufacture of cigarettes
GB2119221B (en) * 1982-04-05 1986-05-29 Filtrona Ltd Cigarette filter
GB8502651D0 (en) * 1985-02-01 1985-03-06 British American Tobacco Co Smoking articles
MY103663A (en) * 1987-12-22 1993-08-28 Bat Cigarettenfab Gmbh Coaxial cigarette.
DE3743597C1 (de) * 1987-12-22 1989-02-16 Bat Cigarettenfab Gmbh Koaxialcigarette

Also Published As

Publication number Publication date
ATE96288T1 (de) 1993-11-15
CA2007022C (en) 1996-09-03
DK7390D0 (da) 1990-01-11
FI900155A0 (fi) 1990-01-11
FI89552C (fi) 1993-10-25
CA2007022A1 (en) 1990-07-17
HK1005842A1 (en) 1999-01-29
DK7390A (da) 1990-07-18
DE58906030D1 (de) 1993-12-02
JP2594657B2 (ja) 1997-03-26
AU4850190A (en) 1990-07-26
FI89552B (fi) 1993-07-15
AU621451B2 (en) 1992-03-12
JPH02234661A (ja) 1990-09-17
FI900155A (fi) 1990-07-18
MY105180A (en) 1994-08-30
EP0378788A1 (de) 1990-07-25
DK173403B1 (da) 2000-09-25
DE3901226C1 (da) 1990-07-26

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