EP0664964A2 - Rauchartikel - Google Patents

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Publication number
EP0664964A2
EP0664964A2 EP94309403A EP94309403A EP0664964A2 EP 0664964 A2 EP0664964 A2 EP 0664964A2 EP 94309403 A EP94309403 A EP 94309403A EP 94309403 A EP94309403 A EP 94309403A EP 0664964 A2 EP0664964 A2 EP 0664964A2
Authority
EP
European Patent Office
Prior art keywords
tobacco smoke
smoking article
absorbing material
vapour phase
article 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
EP94309403A
Other languages
English (en)
French (fr)
Other versions
EP0664964A3 (de
EP0664964B1 (de
Inventor
Kevin Gerard Mcadam
Peter Rex White
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 Investments Ltd
Original Assignee
British American Tobacco Investments Ltd
British American Tobacco Co Ltd
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
Priority claimed from GB9401553A external-priority patent/GB9401553D0/en
Priority claimed from GB9401552A external-priority patent/GB9401552D0/en
Application filed by British American Tobacco Investments Ltd, British American Tobacco Co Ltd filed Critical British American Tobacco Investments Ltd
Publication of EP0664964A2 publication Critical patent/EP0664964A2/de
Publication of EP0664964A3 publication Critical patent/EP0664964A3/de
Application granted granted Critical
Publication of EP0664964B1 publication Critical patent/EP0664964B1/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
    • A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
    • A24D3/06—Use of materials for tobacco smoke filters
    • A24D3/16—Use of materials for tobacco smoke filters of inorganic materials
    • A24D3/163—Carbon
    • 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
    • A24D3/048—Tobacco smoke filters characterised by their shape or structure containing additives
    • 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
    • A24D3/06—Use of materials for tobacco smoke filters

Definitions

  • the present invention relates to smoking articles comprising filter elements having means to reduce vapour phase constituents of tobacco smoke therein.
  • the present invention seeks to overcome the need for an active part to be played by the smoker once smoking of a smoking article has ceased. It is an object of the present invention to provide a smoking article incorporating a tobacco smoke filter element which, even after smoking has occurred, still exhibits, in a passive manner, a deodorising property.
  • 'passive' or 'passive manner' means that no actual part is required of the smoker in order for the remnant of the smoking article or butt to exhibit a deodorising property.
  • the present invention provides a smoking article comprising a tobacco smoke filter element and a wrapped rod of tobacco filler material interconnected by a tipping wrapper, the filter element comprising absorbing material for absorbing the vapour phase constituents of smoke, a tobacco smoke flow path, the tobacco smoke being substantially confined to the tobacco smoke flow path, the absorbing material removing the vapour phase constituents from the tobacco smoke by diffusion of the vapour phase constituents from the tobacco smoke into the absorbing material, and the absorbing material exhibiting the further technical effect of being capable, even after smoking has finished, of absorbing vapour phases emanating from odorous compounds found within the smoked filter element.
  • the vapour phase absorbing material is located annularly about the tobacco smoke flow path.
  • the absorbing material is held on material, such as plugwrap, enwrapping the tobacco smoke flow path.
  • the absorbing material is located in longitudinally spaced arrangement along the length of the plugwrap. This arrangement enables cutting of the unitary filter element to provide in an integral member a double or triple filter-type arrangement without the requirement to cut through material loaded with abrasive granules of absorbing material, for example, carbon, activated carbon or other well-known vapour phase absorbing materials.
  • the vapour phase absorbing material for use in the present invention may advantageously be carbon or activated carbon, suitably in granular form.
  • suitable absorbing materials such as silica, zeolites, Attapulgite clay, high surface area chalk, magnesium hydroxide, for example, or synthetic high surface area absorbing materials will be known and obvious to the skilled reader.
  • the tobacco smoke flow path comprises fibrous filtration material, such as cellulose acetate.
  • the tobacco smoke is confined to the tobacco smoke flow path by channelling the smoke away from the vapour phase absorbing material. More preferably channelling is produced by ventilating into the upstream end of the filter element.
  • the upstream end of the filter element comprises material not coated with absorbing material. Ventilation into that part of the material causes no tobacco smoke at all to contact the absorbing material.
  • the material, at least in this area, may suitably be permeable, although where ventilation in to the filter element is achieved by perforating both the tipping wrapper and the material, this is not essential.
  • the vapour phase absorbing material is located in a recess or recesses in filtration material which provides a tobacco smoke flow path.
  • the recess or recesses may advantageously be a groove or grooves extending longitudinally or annularly on the surface of the filter element.
  • the vapour phase absorbing material may be attached to plugwrap material at spaced locations which register with the recess or recesses in the surface of the filtration material providing a tobacco smoke flow path.
  • the recess or recesses may be located axially disposed within the filter element as a core, which core may be shaped on the surface thereof. Filtration material suitably surrounds the core.
  • the recess or recesses may suitably be physically separated from the filtration material by a wrapper, which may be vapour phase permeable.
  • the tobacco smoke filter element comprises a central core of vapour phase absorbing material, about which is arranged an annulus of tobacco smoke filtration material, such as cellulose acetate.
  • suitable filtration materials include fibrous polypropylene or polyethylene tow.
  • the core of absorbing material is advantageously wrapped with a vapour phase permeable wrapper to allow diffusion of vapour phase constituents into the core but to protect the absorbing material from contact with the particulate phase of the tobacco smoke.
  • a barrier disc may be coaxially arranged at the tobacco end of the core to ensure that no smoke passes along the core.
  • a sheath of absorbing material is located around a central core of filtration material.
  • the core of filtration material may advantageously be wrapped with a vapour phase permeable wrapper.
  • the vapour phase absorbing material may be enclosed in an encapsulating material to form a capsule containing vapour phase absorbing material.
  • the capsule is suitably elongate and extends coaxially lengthwise within the filter element.
  • the ends of the capsule are impermeable to tobacco smoke flow, particularly the particulate matter of tobacco smoke but not necessarily the vapour phase constituents of tobacco smoke.
  • the walls of the capsule along their lengthwise extent are advantageously perforated to enable vapour phase constituents of smoke to diffuse into the capsule and contact the core of absorbing material.
  • the pressure drop of the filtration material tobacco smoke flow path is less than the pressure drop of the capsule of absorbing material. Ventilation may be used to assist in this goal.
  • vapour phase absorbing material may be present in the plugwrap of the filter element.
  • the absorbing material is, therefore, incorporated in the furnish of the plugwrap as the plugwrap is manufactured.
  • the absorbing material if it absorbs water from the paper making stage, releases the water on drying of the paper.
  • FIG. 1 there is depicted part of a cigarette 1 comprising a wrapped rod 2 of tobacco filler material, such as cut tobacco lamina and a proportion of stem.
  • the tobacco filler material may comprise a proportion of expanded tobacco.
  • the filter element 3 comprises a body 4 of fibrous cellulose acetate filtration material.
  • the filtration material could also be polypropylene or polyethylene fibrous material, paper, or polyethylene film material, which may be a separate unit.
  • the body 4 of fibrous filtration material is wrapped in a plugwrap 5.
  • the body 4 of filtration material provides a tobacco smoke flow path.
  • a central portion 6 of the plugwrap 5 is coated on the inner side thereof with a layer of adhesive and a vapour phase absorbing material, in this instance granular carbon material.
  • the overwrapping tipping material 7 is provided with perforations 8 which are either located in the tipping or extend through the tipping and the plugwrap into the body 4 of filtration material.
  • the perforations 8 serve to channel the tobacco smoke into the centre of the body 4 of filtration material. In this way the tobacco smoke is substantially all confined to the tobacco smoke flow path within the body 4 of filtration material and does not come into contact with the vapour phase absorbing material.
  • the filter element 3 serves to filter particulate matter from the tobacco smoke of a lit wrapped rod 2, whilst vapour phase constituents diffuse outwardly during smoking of the cigarette 1 and are absorbed by the absorbing material 6. Because the tobacco smoke is constrained towards the centre of the body 4 of filtration material, the absorbing material is not contaminated with all of the components of tobacco smoke and is therefore very effective at reducing the vapour phase constituents of smoke.
  • the absorbing material is also able to absorb the vapour compounds emanating from odorous material in the particulate matter within the smoked remnant, or butt, of the cigarette 1. This reduces the undesirable stale smoke odour present in cigarette butts after smoking has ceased.
  • the filter element thus serves a dual absorbing purpose, absorbing compounds both during and after smoking.
  • the level of decrease in smoke odour compounds can be measured against a control smoked cigarette butt using, for example, an DL-101 Photo Ionisation Analyser made by HNU Systems Inc.
  • the results of smoking cigarettes according to the invention against control cigarettes are given in Table 1 below.
  • the control cigarette comprised a conventional filter element of fibrous cellulose acetate, 37mm in length, and a 58mm long tobacco rod comprising cut Virginia tobacco wrapped in a paper wrapper having a permeability of 50 CU and treated with 1% potassium citrate.
  • the control cigarette is what might be termed a conventional cigarette.
  • the cigarettes smoked against the control cigarette were of the same format as the control cigarette. Smoking was carried out to a butt length of 36mm under standard machine smoking conditions according to which a 35cm3 puff of two seconds duration is taken every minute. Two comparative cigarettes containing carbon were used.
  • the first cigarette comprised a conventional dual carbon filter element having two adjacent separate lengths one length of 17mm, comprising fibrous cellulose acetate and the other length of 9mm, comprising carbon granules distributed throughout fibrous cellulose acetate.
  • the second cigarette was a cigarette according to the present invention and comprised an integral cellulose acetate filter element 26mm long wrapped in a plugwrap comprising a central portion having carbon granules adhered to the inner face thereof in accordance with Figure 1 hereof.
  • This type of filter element is known as an Active Patch Filter (RTM).
  • Ventilation of the dual acetate filter appears to give some reduction in smoke odour after 1 hour but no continued absorption over 20 hours. Some dissipation of smoke odour occurs with all samples over 20 hours.
  • Table 1 also includes the subjective ranking assigned to the cigarette after 20 hours.
  • the 40% ventilated active patch filter gives the best smoke odour reduction subjectively.
  • the loading level of carbon as the absorbing material is within the range of 15-100mg per cigarette filter element.
  • Other absorbing materials may vary from the range but can readily be determined by experimentation and will, of course, depend on the absorbing capability and/or surface area of the selected absorbing material.
  • FIG. 2 shows in cross-section the filter element of a second embodiment of the inventive concept.
  • Filter element 10 comprises a tobacco smoke flow path 11 of fibrous cellulose acetate filtration material. Non-wrapped acetate may also be utilised.
  • the filtration material has been, for example, thermally moulded to provide grooves 12 on the surface of the filter element 10.
  • the filtration material may be provided with a vapour phase permeable wrapper 13 which physically separates the filtration material from vapour phase absorbing material 14 located within the grooves 12.
  • the wrapper 13 is not an essential feature.
  • the vapour phase absorbing material 14 is activated carbon in the form of granules.
  • the carbon is adhered to plugwrap 15 which enwraps the filter element along the longitudinal extent thereof. Alternatively, the carbon may be adhered to the surface of the filtration material.
  • Tobacco smoke is constrained to flow substantially only through the filtration material. Vapour phase smoke constituents can diffuse outwardly into the carbon granules. This arrangement allows the vapour phase absorbing material 14 to further absorb vapour phases from the odorous material found in smoked cigarette filter elements.
  • Figure 3 depicts a cigarette 31 according to the present invention comprising a wrapped rod 32 of tobacco filler material interconnected by a tipping wrapper 37 to a filter element 33 comprising a body 34 of a fibrous filtration material, such as cellulose acetate, and an elongate capsule 35 containing vapour phase absorbing material such as granular carbon.
  • the capsule 35 is enclosed in an encapsulating material which prevents the inflow of tobacco smoke therein at either end.
  • perforations 36 which enable vapour phase constituents to diffuse into contact with the absorbing material.
  • the filter element is arranged so that the tobacco smoke is constrained to flow within the body 34 of filtration material and particulate matter from the smoke does not contaminate the absorbing material.
  • the pressure drop of the capsule and the surrounding filtration material are arranged so that the tobacco smoke is constrained to flow along the tobacco smoke flow path, separate from the vapour phase absorbing material.
  • FIG. 4 shows a cigarette 101 having a wrapped rod 20 of tobacco filler material and a filter element 30 interattached by tipping wrapper 70.
  • Filter element 30 comprises an annular body 40 of filtration material, such as fibrous cellulose acetate, wrapped in a plugwrap.
  • the core 19 is provided with a wrapper 100 which is permeable to the vapour phases of tobacco smoke and thus prevent contamination of the absorbing material by particulate matter of tobacco smoke.
  • the filter element 30 is ideally arranged so that the pressure drop of the core 19 is greater than the pressure drop of the annular body 40, whereby the tobacco smoke is constrained to flow along the tobacco smoke flow path of body 40. Where the pressure drops of the various materials do not readily allow this to occur, a barrier 21 may be utilised, possibly in addition to wrapper 100, to prevent smoke flowing along the core 19.
  • inventions of Figures 3 and 4 may not rely solely on the pressure drop arrangement of the core of absorbing material and the body of filtration material in order to constrain the tobacco smoke substantially to the tobacco smoke flow path provided by the filtration material.
  • the tobacco smoke may be confined to the tobacco smoke flow path because the particulate matter of the smoke is physically prevented from contacting the vapour phase absorbing material.
  • Figure 5 depicts a conventional filter element 300 of fibrous cellulose acetate filtration material interattached to a wrapped rod 200 of tobacco filler material by a tipping wrapper 700.
  • a plugwrap 500 incorporated vapour phase absorbing material therewithin. Ventilation perforations may be provided if so desired.
  • Tobacco smoke is confined to the flow path provided by the filtration material, whilst vapour phase smoke constituents can diffuse outwardly to the plugwrap.
  • the absorbing material after absorbing vapour phase constituents from the smoke the absorbing material is able to absorb the vapour phases emanating from odorous compounds found within a smoked cigarette butt, thus decreasing the stale smoke odour.
  • the inventive cigarettes In subjective smoke tests of cigarettes according to the embodiments described with respect to Figures 3, 4 and 5 of the present invention with carbon loading levels of about 25mg smoked against control cigarettes containing no carbon, the inventive cigarettes exhibited a noticeable reduction in stale tobacco smoke odour when sealed containers containing the inventive and control cigarette butts were opened and compared.
  • the level of decrease in smoke odour compounds can be measured against a control smoked cigarette butt using a DL-101 Photo Ionisation Analyser made by HNU Systems Inc.
  • the loading level of carbon as the absorbing material is within the range of 15-100mg per cigarette filter element.
  • Other absorbing material may vary from this range but can readily be determined by experimentation and will, of course, depend on the absorbing capability and/or surface area of the selected absorbing material.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Cigarettes, Filters, And Manufacturing Of Filters (AREA)
  • Manufacture Of Tobacco Products (AREA)
  • Compounds Of Unknown Constitution (AREA)
  • Catching Or Destruction (AREA)
EP94309403A 1994-01-27 1994-12-15 Rauchartikel Expired - Lifetime EP0664964B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB9401553 1994-01-27
GB9401552 1994-01-27
GB9401553A GB9401553D0 (en) 1994-01-27 1994-01-27 Improvements relating to smoking articles
GB9401552A GB9401552D0 (en) 1994-01-27 1994-01-27 Improvements relating to smoking articles

Publications (3)

Publication Number Publication Date
EP0664964A2 true EP0664964A2 (de) 1995-08-02
EP0664964A3 EP0664964A3 (de) 1997-04-23
EP0664964B1 EP0664964B1 (de) 2003-07-09

Family

ID=26304224

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94309403A Expired - Lifetime EP0664964B1 (de) 1994-01-27 1994-12-15 Rauchartikel

Country Status (6)

Country Link
EP (1) EP0664964B1 (de)
AT (1) ATE244516T1 (de)
DE (1) DE69432920T2 (de)
DK (1) DK0664964T3 (de)
ES (1) ES2201071T3 (de)
PT (1) PT664964E (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005023026A1 (en) * 2003-07-10 2005-03-17 British American Tobacco (Investments) Limited Improvements relating to smoking article filters
WO2009098462A1 (en) * 2008-02-07 2009-08-13 Filtrona International Limited Tobacco smoke filter
WO2011060008A1 (en) * 2009-11-11 2011-05-19 R. J. Reynolds Tobacco Company Filter element comprising smoke-altering material
ITBO20120536A1 (it) * 2012-10-01 2014-04-02 Montrade S R L Elemento filtrante additivato per articoli da fumo e metodo per la sua realizzazione
US9066542B2 (en) 2008-05-30 2015-06-30 British American Tobacco (Investments) Limited Filter for a smoking article
US10609955B2 (en) 2011-04-08 2020-04-07 R.J. Reynolds Tobacco Company Filtered cigarette comprising a tubular element in filter
WO2021052172A1 (zh) * 2019-09-18 2021-03-25 索图电子(惠州)有限公司 烟用过滤部件
US11957163B2 (en) 2011-04-08 2024-04-16 R.J. Reynolds Tobacco Company Multi-segment filter element including smoke-altering flavorant

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3297038A (en) * 1964-04-20 1967-01-10 Homburger Freddy Filter cigarette
FR2669240A1 (fr) * 1990-11-19 1992-05-22 Cigarette Components Ltd Filtre de fumee contenant un additif de modification de fumee particulaire.
EP0579410A1 (de) * 1992-07-04 1994-01-19 British-American Tobacco Company Limited Rauchartikel
EP0608047A2 (de) * 1993-01-19 1994-07-27 Philip Morris Products Inc. Konzentrischer Rauchfilter mit einem Aussenmantel aus einem Zelluloseazetatstrang und mit einem Kern aus einer Aktivkohle enthaltenden Filterbahn
EP0628260A2 (de) * 1993-06-11 1994-12-14 R.J. Reynolds Tobacco Company Zigarettenfilter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3297038A (en) * 1964-04-20 1967-01-10 Homburger Freddy Filter cigarette
FR2669240A1 (fr) * 1990-11-19 1992-05-22 Cigarette Components Ltd Filtre de fumee contenant un additif de modification de fumee particulaire.
EP0579410A1 (de) * 1992-07-04 1994-01-19 British-American Tobacco Company Limited Rauchartikel
EP0608047A2 (de) * 1993-01-19 1994-07-27 Philip Morris Products Inc. Konzentrischer Rauchfilter mit einem Aussenmantel aus einem Zelluloseazetatstrang und mit einem Kern aus einer Aktivkohle enthaltenden Filterbahn
EP0628260A2 (de) * 1993-06-11 1994-12-14 R.J. Reynolds Tobacco Company Zigarettenfilter

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1819780B (zh) * 2003-07-10 2011-12-14 英美烟草(投资)有限公司 烟制品过滤嘴的改进
AU2004269948B2 (en) * 2003-07-10 2008-07-24 British American Tobacco (Investments) Limited Improvements relating to smoking article filters
AU2004269948B9 (en) * 2003-07-10 2008-09-11 British American Tobacco (Investments) Limited Improvements relating to smoking article filters
EA011263B1 (ru) * 2003-07-10 2009-02-27 Бритиш Америкэн Тобэкко (Инвестментс) Лимитед Фильтр курительных изделий
WO2005023026A1 (en) * 2003-07-10 2005-03-17 British American Tobacco (Investments) Limited Improvements relating to smoking article filters
US8141559B2 (en) * 2003-07-10 2012-03-27 British American Tobacco (Investments) Limited Relating to smoking article filters
WO2009098462A1 (en) * 2008-02-07 2009-08-13 Filtrona International Limited Tobacco smoke filter
JP2011510674A (ja) * 2008-02-07 2011-04-07 フィルトロナ インターナショナル リミティド たばこ煙フィルタ
CN101969797A (zh) * 2008-02-07 2011-02-09 菲尔特隆纳国际有限公司 烟草烟雾过滤嘴
US9066542B2 (en) 2008-05-30 2015-06-30 British American Tobacco (Investments) Limited Filter for a smoking article
WO2011060008A1 (en) * 2009-11-11 2011-05-19 R. J. Reynolds Tobacco Company Filter element comprising smoke-altering material
US8997755B2 (en) 2009-11-11 2015-04-07 R.J. Reynolds Tobacco Company Filter element comprising smoke-altering material
US10609955B2 (en) 2011-04-08 2020-04-07 R.J. Reynolds Tobacco Company Filtered cigarette comprising a tubular element in filter
US11957163B2 (en) 2011-04-08 2024-04-16 R.J. Reynolds Tobacco Company Multi-segment filter element including smoke-altering flavorant
ITBO20120536A1 (it) * 2012-10-01 2014-04-02 Montrade S R L Elemento filtrante additivato per articoli da fumo e metodo per la sua realizzazione
WO2021052172A1 (zh) * 2019-09-18 2021-03-25 索图电子(惠州)有限公司 烟用过滤部件
EP4032416A4 (de) * 2019-09-18 2023-11-01 Soul-Tour Electronics (Huizhou) Co., Ltd. Filterkomponente für das rauchen

Also Published As

Publication number Publication date
EP0664964A3 (de) 1997-04-23
EP0664964B1 (de) 2003-07-09
PT664964E (pt) 2003-10-31
DE69432920D1 (de) 2003-08-14
DK0664964T3 (da) 2003-10-27
ATE244516T1 (de) 2003-07-15
DE69432920T2 (de) 2004-05-19
ES2201071T3 (es) 2004-03-16

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