WO1999026495A1 - Articles de fumeur - Google Patents

Articles de fumeur Download PDF

Info

Publication number
WO1999026495A1
WO1999026495A1 PCT/GB1998/003551 GB9803551W WO9926495A1 WO 1999026495 A1 WO1999026495 A1 WO 1999026495A1 GB 9803551 W GB9803551 W GB 9803551W WO 9926495 A1 WO9926495 A1 WO 9926495A1
Authority
WO
WIPO (PCT)
Prior art keywords
mouthpiece
rod
smoking
smoke
bore
Prior art date
Application number
PCT/GB1998/003551
Other languages
English (en)
Inventor
Paul David Case
Original Assignee
British American Tobacco (Investments) Limited
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 British American Tobacco (Investments) Limited filed Critical British American Tobacco (Investments) Limited
Priority to AU12526/99A priority Critical patent/AU1252699A/en
Publication of WO1999026495A1 publication Critical patent/WO1999026495A1/fr

Links

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 present invention relates to smoking articles, cigarettes for example.
  • the bores may be self-sustaining or may be provided by tubes extending longitudinally of the smoking material rod thereof .
  • reasons for the incorporation of such bores in smoking articles include the introduction of air into the tobacco or other smoking material during smoking, a more uniform yield of smoke components throughout smoking, a more even burning of the smoking material and a reduction of tar and nicotine yields of the smoking article.
  • GB 1 340 926 discloses a cigarette comprising a tobacco rod and a bore extending longitudinally therewithin, the cigarette further comprising a fluid-tight wall at the mouth end of the bore.
  • the wall blocks the passage of air along the bore and the air is thus caused to pass through the surrounding tobacco filter.
  • Mixing of the air with the smoke passing along the tobacco rod effects a cooling of the smoke, which cooling causes condensation of the components of the smoke and thereby causes a reduction of the amount of components of the smoke inhaled by the smoker.
  • Such a smoking article with a fluid tight wall obturating a longitudinal bore would be difficult to manufacture.
  • a cigarette comprising a tapered bore extending longitudinally from a filter end of the tobacco rod along a proportion of the length of the tobacco rod is disclosed in GB 2 149 287.
  • the cigarette further comprises a triple filter comprising a section of vapour release material in an abutting relationship between two sections of cellulose acetate. It is stated in this document that smoke which has passed along the bore of the tobacco rod is of a much higher temperature than smoke which has passed along the tobacco rod of a conventional cigarette.
  • the smoking article of GB 2 149 287 utilises this phenomenon in order to cause vaporisation of the volatile components of the vapour release material in the filter.
  • the higher smoke temperature at the filter of the cigarette means that cellulose acetate material of the filter can be melted, especially upon ignition of the smoking article.
  • a smoking article in accordance with GB 2 149 287 provides the smoker with a heavily modified smoke. Furthermore, these smoking articles were never commercially produced, partly because of the difficulty of manufacturing large volumes of particulate tobacco rods with a bore extending therethrough.
  • GB 2 078 087 discloses a smoking article comprising an extruded, tobacco-containing smoking material rod comprising at least one bore therethrough.
  • the smoking material rod has a density and porosity sufficient to substantially occlude gas flow through the tobacco mass, but has a porosity sufficient to maintain combustion. It is claimed that the combination of high density, low porosity tobacco mass and a bore therethrough enables the delivery of gas phase and particulate matter of the smoke to be controlled.
  • a high density tube of the type described in GB 2 078 087 would be difficult to manufacture and would be fragile. Such a fragile product would not be commercially acceptable.
  • air permeable plugs may optionally be present in the bore, but the provision of such plugs would present a difficult manufacturing problem.
  • An object of the present invention is to provide an improved smoking article comprising a bore.
  • the present invention provides a smoking article comprising a smoking material rod and a mouthpiece, which mouthpiece is disposed at one end of the smoking material rod, wherein the smoking material rod comprises a bore extending longitudinally therethrough, which bore is in gas flow communication with the mouthpiece, and the mouthpiece comprises heat sink means, which heat sink means comprises heat stable material, the heat sink means being effective to reduce the temperature of smoke that has entered the mouthpiece from the bore such that the temperature of the smoke at exit from the mouthpiece is acceptable to a smoker of the smoking article.
  • the bore extends over the full length of the smoking material rod and is open at the lighting end of the rod and in direct gas flow communication with the mouthpiece at the mouthpiece end of the rod. If the bore does not extend over the full length of the smoking material rod, the bore may extend to an opening thereof at either the mouthpiece end or the lighting end thereof. Preferably, if the bore does not extend to the lighting end of the rod, the bore will nevertherless extend to a distance no more than 5mm, say, of the lighting end of the rod. Much by preference the bore extends over a major proportion of the length of the rod.
  • the rod may comprise two or more bores.
  • heat stable means that the material is not, or is not substantially, altered, either physically or chemically by the application of the heat of the smoke. Thus, for example, the material does not melt and thereby fuse so as to provide a non-porous mass.
  • the specific heat capacity of the heat sink material is advantageously sufficiently high that the mouthpiece does not become unacceptably hot when the smoking article is in use.
  • the mouthpiece of a smoking article m accordance with the present invention may comprise a single section of heat sink material, which single section is gas-permeable.
  • the mouthpiece may comprise a plurality of sections disposed sequentially over the length of the mouthpiece.
  • the mouthpiece comprises a section of conventional smoke filtration material, cellulose acetate or paper filtration material, for example.
  • the heat sink means is advantageously located at the upstream end of the mouthpiece.
  • the heat sink means abuts at least a portion of the end face of the smoking material rod.
  • Suitable heat stable, high heat capacity materials for use m or as the heat sink means of a smoking article m accordance with the present invention include clays, aluminium silicates for example; metals, aluminium or copper for example; and metal compounds or alloys.
  • the heat sink means may comprise paper filtration material and/or reconstituted tobacco material. Such paper filtration material or reconstituted tobacco may have been modified to render it heat stable and/or of high heat capacity.
  • the paper filtration material or reconstituted tobacco may be loaded with calcium carbonate or other high specific heat capacity substance.
  • the heat stable, high heat capacity material may be, for example, of sheet form, wire form, tube form or particulate form.
  • the heat sink means may comprise a bundle of fibres, wires or tubes of the heat stable, high heat capacity material, which bundle may be intermingled with conventional filtration material.
  • the heat stable material may comprise a porous body of material. Particulate high heat capacity material may be scattered throughout a conventional filtration material to provide a section of the mouthpiece. Alternatively, particulate high heat capacity material may be located in a cavity of a multi-section mouthpiece.
  • the heat stable material may form either the core or an annular section of a coaxial mouthpiece.
  • the mouthpiece of a smoking article of the present invention may comprise a thermal insulating layer.
  • Suitable insulating materials for the layer include glass fibre and/or a double plugwrap material and/or double tipping material.
  • the whole, or substantially the whole, of the temperature reduction of the smoke is effected by way of the heat sink means.
  • the amount of material required will be determined by the temperature reduction required to be effected on the smoke.
  • a proportion of the heat reduction of the smoke in a smoking article in accordance with the present invention may be effected by other means.
  • the heat sink of the present smoking article may comprise a section of volatile material.
  • a proportion of the heat of the smoke entering the mouthpiece would be utilised to vaporise the volatile material, thereby effecting a reduction in the smoke temperature.
  • a proportion of the heat of the smoke may be dissipated by way of the provision in the smoking article of ventilation means, whereby in the smoking of the article cooling/ventilating air is drawn radially into the article.
  • the smoke temperature of smoke inhaled by a smoker of a conventional smoking article is commonly about room temperature, standard room temperature generally being accepted as being in the range of about 20-25°C. However, it is conceivable that a smoke temperature of around body temperature, i.e. around 37 °C, would also be an acceptable smoke temperature for smoke inhaled by a smoker.
  • the ignition temperature of a smoking article ignition device may be as high as 1200°C, depending upon the nature of the device. For example, the temperature of the flame of a propane gas lighter has been determined to be around 700-800°C. Other means of ignition include petrol or electrical lighters and matches.
  • the heat sink means should, therefore, be capable of ensuring that the temperature of the smoke and/or gases at the time of ignition of the smoking article is reduced from what may be a very high temperature to around 37 °C, and more preferably to around 20°C.
  • the smoking material rod may comprise tobacco, a tobacco containing material or a non-tobacco containing smokable material.
  • Suitable tobacco containing materials are disclosed in GB 2 201 081.
  • Suitable non-tobacco containing smoking materials are disclosed in EPA 781 101.
  • the smoking material rod is suitably an extruded rod.
  • An advantage of an extruded rod is that it may readily be extruded to comprise a self-sustaining bore.
  • the smoking material rod may comprise a rod of particulate smoking material.
  • the bore may be formed by means of the insertion of a probe or spigot longitudinally into the smoking material rod thereby compressing and forming the surrounding particulate material into an annular conformation. Collapse of the annular section into the bore upon removal of the probe or spigot may be prevented by inserting a tube into the bore in order to provide a supporting wall for the particulate smoking material.
  • a suitable tube may be comprised of reconstituted tobacco sheet material, for example.
  • the inner surface of the particulate material annulus may be coated with a bonding agent .
  • the density of the wall of the smoking material rod is no more than 800mg cm " P More preferably the wall density is less than 600mg cm P and yet more preferably it is less than 450mg cm " P Much by preference the wall density is in the range of about 100- 250mg cm " P
  • the weight of the smoking material rod is suitably in the range of 3.5-7.8mg per mm rod length.
  • the mean wall thickness of the smoking material rod is preferably no less than 1.5mm.
  • the smoking material rod should be porous .
  • the tube wall is preferably of a cellular structure. Whilst a proportion of the cellular structure may comprise closed cells, the majority preferably comprises an open cell structure to provide for gas flow along the wall and radially through the wall.
  • the smoking material rod is enwrapped in wrapping material, cigarette paper for example.
  • flavours may be incorporated into or applied onto the smoking material rod and/or the mouthpiece, in order to enhance the flavour and/or the odour of the mainstream smoke and/or the odour of the sidestream smoke.
  • the smoking material rod may comprise burn additives.
  • a smoking article in accordance with the present invention may be ventilated according to techniques commonly known in the art .
  • the pressure drop of the mouthpiece is preferably such that the resistance to draw of the smoking article is acceptable to the smoker.
  • Conventional resistance to draw is in the range of about 80- 120mm WG.
  • FIGS 1 to 6 show respectively six different embodiments of cigarettes in accordance with the present invention.
  • the cigarette of Figure 1 comprises a smoking material rod 1, and a mouthpiece generally designated by reference numeral 2.
  • the smoking material rod 1 comprises a central bore 3, which bore extends longitudinally over the full length of the smoking material rod 1.
  • the mouthpiece 2 comprises a first section of heat stable, high heat capacity material 4, providing a heat sink, and a second section 5 of cellulose acetate .
  • the heat sink material 4 absorbs a proportion of the heat of the smoke entering the mouthpiece 2 and thereby causes a cooling of the smoke. Therefore, the cellulose acetate section 5 does not fuse when the smoke passes therethrough. Furthermore, the smoke inhaled by the smoker is thus at an acceptable temperature .
  • the cellulose acetate section 5 of the mouthpiece 2 may be omitted from the article of Figure 1.
  • the heat stable, high heat capacity material 4 may occupy the entire length of the mouthpiece.
  • the cellulose acetate section 5, may be replaced by a vacant space.
  • the mouthpiece 2 of the cigarette of Figure 2 comprises a core and annulus filter arrangement in which a first, core portion 11, comprising a heat stable, high heat capacity material, provides a heat sink, which heat sink extends longitudinally of a central zone of the mouthpiece 2.
  • the central portion 11 of the mouthpiece 2 absorbs heat from the smoke entering the mouthpiece 2, causing a cooling of the smoke and thereby preventing the cellulose acetate section 12 from melting .
  • the cigarette of Figure 3 embodies a mouthpiece 2 comprising heat stable, high heat capacity material 21 interspersed between cellulose acetate filtration material 22 thus providing a heat sink.
  • the heat stable material 21 absorbs heat from the smoke during smoking and thus prevents the cellulose acetate material 22 of the mouthpiece 2 from melting. Furthermore, the smoke inhaled by the smoker is of an acceptable temperature.
  • the mouthpiece 2 of the cigarette of Figure 4 comprises a section of particulate heat stable, high heat capacity material 31 abutted at the downstream side by a section 32 of cellulose acetate filtration material and at the upstream side by a void section 33.
  • the high heat capacity material 31 absorbs heat from the smoke, cooling the smoke to an acceptable temperature, and thus preventing the cellulose acetate section 32 from melting.
  • the cigarette of Figure 5 comprises a smoking material rod 1 comprising cut tobacco material with a central bore 3 extending longitudinally therethrough.
  • the central bore 3 is supported by means of a tube 41 of reconstituted tobacco sheet material.
  • the mouthpiece 2 comprises a first section 42 of a heat stable, high heat capacity material.
  • the first section 42 is overwrapped by a thermal insulating material 43, thus to form an annulus of insulating material around the first section 42.
  • the mouthpiece 2 further comprises a second filter section 43 of paper filtration material.
  • the first section 42 absorbs heat from the smoke entering the mouthpiece.
  • the insulation material 43 prevents the exterior surface of the mouthpiece 2 becoming over-hot as a result of a temperature rise of the high heat capacity material 42 effected by the absorbance thereby of heat from the smoke.
  • the reduction in temperature of the smoke means that the smoke inhaled by the smoker is of an acceptable temperature.
  • the cigarette of Figure 6 comprises a smoking material rod 1, which, as with the rod 1 of Figure 5 cigarette, comprising a rod of cut tobacco material through which a central bore 3 extends longitudinally. However, in this case, instead of being supported by a tube, the interior surface of the bore 3 is coated with a layer of adhesive 51.
  • the mouthpiece 2 comprises a first, upstream section 52, a second, middle section 53 and a third, mouth end section 54.
  • the first section 52 is comprised of a heat stable, high heat capacity material.
  • the second section 53 is comprised of a paper filtration material and the third section 54 is comprised of a cellulose acetate filtration material.
  • the first and second sections 52 and 53 of the mouthpiece 2 absorb heat from the smoke entering the mouthpiece 2.
  • the temperature reduction of the smoke passing through the mouthpiece means that the cellulose acetate section 54 does not become fused, and that the smoker inhales smoke of an acceptable temperature .
  • Ventilation means could be made whereby ventilation air could ingress radially into the smoking material rod 1 and/or radially into the mouthpiece 2.
  • any of the above depicted cigarettes could incorporate a cigarette paper wrapper enwrapping the smoking material rod thereof and/or a wrapper enwrapping the mouthpiece .

Abstract

L'invention concerne une cigarette qui comprend une tige tubulaire (1) en matière à fumer et un embout (2) qui comprend un dissipateur de chaleur (4) conçu pour refroidir la fumée qui pénètre dans l'embout en provenance de la partie intérieure (3) creuse de la tige.
PCT/GB1998/003551 1997-11-26 1998-11-26 Articles de fumeur WO1999026495A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU12526/99A AU1252699A (en) 1997-11-26 1998-11-26 Smoking articles

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9724872.8A GB9724872D0 (en) 1997-11-26 1997-11-26 Smoking articles
GB9724872.8 1997-11-26

Publications (1)

Publication Number Publication Date
WO1999026495A1 true WO1999026495A1 (fr) 1999-06-03

Family

ID=10822599

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1998/003551 WO1999026495A1 (fr) 1997-11-26 1998-11-26 Articles de fumeur

Country Status (3)

Country Link
AU (1) AU1252699A (fr)
GB (1) GB9724872D0 (fr)
WO (1) WO1999026495A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007093852A2 (fr) * 2005-12-29 2007-08-23 Philip Morris Products S.A. Article a fumer ayant un meilleur profile d'acheminement
WO2008081339A3 (fr) * 2006-12-28 2008-10-30 Philip Morris Prod Divers modes de réalisation pour fabriquer un bâtonnet-filtre de tabac avec un passage creux s'étendant à travers celui-ci
IT201800010060A1 (it) * 2018-11-06 2020-05-06 Gd Spa Sigaretta

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3774622A (en) * 1971-11-16 1973-11-27 K Steigerwald Device,particularly a cigarette,for smoking a cord of smokable material
EP0482872A1 (fr) * 1990-10-26 1992-04-29 Rothmans International Services Limited Article à fumer
WO1996003060A1 (fr) * 1994-07-28 1996-02-08 Lorillard Tobacco Company Article a fumer creux

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3774622A (en) * 1971-11-16 1973-11-27 K Steigerwald Device,particularly a cigarette,for smoking a cord of smokable material
EP0482872A1 (fr) * 1990-10-26 1992-04-29 Rothmans International Services Limited Article à fumer
WO1996003060A1 (fr) * 1994-07-28 1996-02-08 Lorillard Tobacco Company Article a fumer creux
US5690127A (en) * 1994-07-28 1997-11-25 Lorillard Tobacco Company Hollow cigarette

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007093852A2 (fr) * 2005-12-29 2007-08-23 Philip Morris Products S.A. Article a fumer ayant un meilleur profile d'acheminement
WO2007093852A3 (fr) * 2005-12-29 2008-05-29 Philip Morris Prod Article a fumer ayant un meilleur profile d'acheminement
WO2008081339A3 (fr) * 2006-12-28 2008-10-30 Philip Morris Prod Divers modes de réalisation pour fabriquer un bâtonnet-filtre de tabac avec un passage creux s'étendant à travers celui-ci
US7827994B2 (en) 2006-12-28 2010-11-09 Philip Morris Usa Inc. Method for producing a tobacco rod with a hollow passageway extending therethrough
IT201800010060A1 (it) * 2018-11-06 2020-05-06 Gd Spa Sigaretta

Also Published As

Publication number Publication date
AU1252699A (en) 1999-06-15
GB9724872D0 (en) 1998-01-21

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