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EP0599897B1 - Regulation de la chimie de la fumee des cigarettes - Google Patents

Regulation de la chimie de la fumee des cigarettes Download PDF

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Publication number
EP0599897B1
EP0599897B1 EP92916991A EP92916991A EP0599897B1 EP 0599897 B1 EP0599897 B1 EP 0599897B1 EP 92916991 A EP92916991 A EP 92916991A EP 92916991 A EP92916991 A EP 92916991A EP 0599897 B1 EP0599897 B1 EP 0599897B1
Authority
EP
European Patent Office
Prior art keywords
filter element
tobacco
smoke
cigarette
flavour
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
EP92916991A
Other languages
German (de)
English (en)
Other versions
EP0599897A1 (fr
Inventor
Warren A. Brackmann
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.)
Rothmans Benson and Hedges Inc
Original Assignee
Rothmans Benson and Hedges Inc
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 Rothmans Benson and Hedges Inc filed Critical Rothmans Benson and Hedges Inc
Publication of EP0599897A1 publication Critical patent/EP0599897A1/fr
Application granted granted Critical
Publication of EP0599897B1 publication Critical patent/EP0599897B1/fr
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 present invention relates to controlling the chemistry of cigarette smoke entering a smoker's mouth, to provide a desirable combination of high sensory appeal and low tar.
  • Tar is a component of cigarette smoke considered undesirable and attempts are continually being made to deliver lower quantities of tar to the smoker.
  • Conventional procedures have included increased filtration and ventilation. However, only a certain level of filtration can be achieved with conventional filters before the pressure drop across the filter becomes unacceptably high.
  • EP-A-226,368 describes the provision of a cigarette in which the filler rod is formed from two different blends of tobacco and which has an approximately uniform delivery of flavour along its length.
  • One of the blends is of high flavour-to-tar ratio tobacco, which may be leaves from the higher part of the plant. Such higher flavour-to-tar ratio tobacco is employed in the novel cigarette provided herein.
  • the present invention seeks to achieve a unique result, in providing the high flavour level associated with popular brands of cigarettes but at a significantly lower tar level.
  • the present invention is able to provide a more uniform delivery of flavour and tar as the cigarette is smoked, as compared with a conventional cigarette.
  • a cigarette smoke filter element comprising:
  • Figure 1 is a graphical presentation of smoking test results.
  • flavour produced by tobacco from such leaves, or the tips generally is too high to be acceptable to a smoker in a conventional cigarette and hence the tobacco usually is blended with tobacco from the whole plant to provide an overall lower flavoured tobacco blend.
  • the applicants have found that it is possible to employ such strongly flavoured tobacco and not only achieve a flavour level comparable to that of popular brands, but thereby deliver a much lower level of tar, consistent with the higher flavour/tar ratio of smoke produced by such tobacco.
  • a higher flavour level may be provided but at a lower or the same tar level, as required.
  • microfine fibers in tubular form may be used herein to decrease the flavour level produced by the tobacco.
  • the microfine fibers in the cylinder thereof generally each has a diameter of about 0.5 to 10 microns.
  • the cylinder of such fibers generally has a thickness of about 0.05 to about 4 mm and a density of about 0.05 to about 0.3 g/cc.
  • the elongate cylinder of microfine fibers preferably is arranged so that all the tobacco smoke passing through the filter containing the microfine fibers cylinder is directed through the cylinder wall.
  • This result may be achieved by providing an outer annulus of high density conventional acetate filter tow material surrounding the microfine fiber cylinder, which in turn surrounds an inner core.
  • a baffle, or other tobacco flow path directing means, is provided at the upstream end to direct tobacco smoke from the cigarette only into the high density material.
  • Such a known filter structure is disclosed in PCT publication No. WO 90/09741.
  • the microfine fiber cylinder is a highly efficient filtration medium but rapidly becomes clogged, so that the tobacco smoke must traverse an increasingly longer path through the outer annulus of conventional tow material and is filtered thereby before passing through the wall of the cylinder of microfine fibers into an inner axial cigarette smoke flow path leading to the downstream end of the filter element.
  • the filter achieves a greater degree of filtration of the tobacco smoke as smoking proceeds and hence tends to counteract the increasing level of flavour and tar delivery which results as smoking progresses, so that a more uniform flavour delivery to the smoker is achieved.
  • EP 364,253 describes a similar filter structure to that provided herein, in which an opening is provided through an elongate cylinder of microfine fibres. However, this opening is provided at the approximate midpoint of the length of the filler, rather than at the upstream end, and does not provide the initial high flavour puffs achieved herein.
  • conventional cellulose acetate tow material is provided at the core of the filter element, with low flow resistance cellulose acetate tow being provided as the outer annulus.
  • a baffle or other smoke path directing means can be provided to direct smoke into the central core.
  • ventilation holes may be provided in the filter wrapper closer to downstream end of the filter than is normal to improve CO dispersion of carbon monoxide (CO). In general, ventilation decreases the CO content of the smoke entering the smoker's mouth.
  • CO carbon monoxide
  • the higher-than-normal flavour/tar ratio tobacco which is used in a cigarette for which the filter element is envisaged produces a higher-than-normal flavour level in the tobacco smoke from a burning cigarette containing the same.
  • the flavour level of tobacco reaching the smoker's mouth from the burning cigarette is decreased to conventional levels.
  • this same ratio may be retained when the smoke reaches the smoker's mouth, so that a significantly lower tar delivery results while the same flavour level is achieved as in a conventional highly-flavoured brand of cigarette.
  • the uniformity of delivery of the tobacco flavour to the smoker from a cigarette can be improved further by providing a greater proportion of more highly-flavoured tobacco towards the lighting end and a greater proportion of less highly-flavoured tobacco towards the filter end of the cigarette.
  • the flavour strength produced by a cigarette increases as smoking progresses.
  • this effect tends to be counteracted.
  • a filler rod containing a combination of differently-flavoured tobacco may be provided in the manner described in US-A-4,896,681. Alternatively, discrete segments of differently-flavoured tobacco may be employed in the filler rod.
  • the present invention therefore, provides a filter element for use with a cigarette, which, in combination, exhibit a high sensory appeal while delivering a low level of tar to the smoker with a more uniform flavour delivery, by a combination of factors, as follows:
  • the latter puff manipulation with respect to the flavour and tar produced in the latter puffs of smoking the cigarette may be effected, as described above, by utilizing a smoke re-route filtration technique optionally in combination with using lesser strength tobacco at the filter end.
  • Flavour strength reset is achieved, as described above, by utilizing a cylinder of microfine fibers as a filter element, optionally in combination with by using lesser strength tobacco at the filter end or preferably by using expanded tobacco at the filter end, or preferably a combination thereof.
  • the cylinder of microfine fibers being incorporated into a smoke re-route filter and a higher proportion of lesser-flavoured expanded tobacco being used at the filter end and a higher proportion of the higher-than-normal flavour tobacco, possessing the high flavour-to-tar ratio, being used at the lighting end.
  • the standard Benson & Hedges 100s (B & H) cigarettes (plot 3) increased from an initial tar level of 0.5 mg to a last puff tar level of 1.8 mg for a total of 13.1 mg.
  • the highly flavoured tobacco was provided as a segment at the lighting end of the cigarette and a segment of expanded tobacco was provided at the filter end. Again a standard B & H filter was used. Plot (4) was obtained for this cigarette. In this instance, the tar rose from an initial level of 0.9 mg to 1.9 mg for the latter puff, for a total tar delivery of 12.5 mg, well below that for the highly flavoured tobacco above.
  • a comparison of plots (4) and (5) illustrates the significant improvement in tar delivery which is attainable using a segment of expanded tobacco at the filter end of the cigarette filler rod. Both plots (4) and (5) exhibit a significant dip in the tar delivery during the middle puffs. The reason for this is unknown but is generally a characteristic of all cigarettes to some degree.
  • plot (2) shown an increase from 0.3 to 1.7 mg during smoking for a total tar deliveries of 10.1 mg, i.e. significantly below the B & H value.
  • a comparison of plots (2) and (5) illustrates the significant effect that the replacement of the conventional filter by one containing a cylinder of microfine fibers has on the tar delivery.
  • plot (1) there is shown the tar delivery from a cigarette having a filter containing a cylinder of microfine fibers and containing a segment of expanded tobacco at the filter end.
  • the tar increased from 0.2 mg for the first puff to 0.9 mg at the last puff, for a total tar delivery of only 4.7 mg.
  • a comparison of plots (1) and (4) illustrates the effect on tar delivery of the utilization of a filter comprising a cylinder of microfine fibers in place of a conventional filter.
  • a comparison of plots (1) and (3) illustrates the effect on the tar delivery of the utilization of a cigarette constructed according to the present invention in comparison to a standard cigarette delivering the same flavour level. It will also be seen that, not only is a lower puff-to-puff level of tar delivery and an overall significantly lower tar delivery achieved, but the curve is flatter in the case of the present invention, so that a more uniform delivery of tar and flavour is achieved.

Landscapes

  • Cigarettes, Filters, And Manufacturing Of Filters (AREA)
  • Indole Compounds (AREA)
  • Manufacture Of Tobacco Products (AREA)

Claims (9)

  1. Elément de filtre pour la fumée de cigarette comprenant :
    un tampon allongé d'un matériau de filtre pour la fumée de tabac;
    un cylindre allongé de fibres microfines non-absorbantes fourni sur ledit tampon allongé et présentant une résistance à l'écoulement de la fumée de cigarette inférieure radialement à travers celui-ci que longitudinalement à travers ledit tampon allongé; et
    une voie d'écoulement de la fumée de tabac annulaire, axialement dirigée, disposée radialement vers l'extérieur dudit cylindre allongé;
    caractérisé en ce que :
    ladite voie pour la fumée de tabac annulaire, axialement dirigée présente une résistance à l'écoulement de la fumée de cigarette inférieure longitudinalement dans celle-ci que longitudinalement à travers ledit tampon allongé; et
    un moyen dirigeant la voie d'écoulement de la fumée de tabac disposé à l'extrémité amont dudit élément de filtre dans la direction projetée de l'écoulement de la fumée de cigarette pour y diriger la fumée de cigarette à partir d'une cigarette à laquelle l'élément de filtre est fixé uniquement dans ledit tampon allongé de matériau de filtre pour le tabac.
  2. Elément de filtre selon la revendication 1, caractérisé en ce que le tampon allongé de matériau de filtre pour la fumée de tabac est un matériau de filtre de filasse d'acétate de cellulose classique.
  3. Elément de filtre selon la revendication 1 ou 2, caractérisé en ce que ledit moyen dirigeant la voie d'écoulement du tabac est fourni par un moyen de déviation à ladite extrémité amont dudit filtre.
  4. Elément de filtre selon l'une quelconque des revendications 1 à 3, caractérisé en ce que ladite voie annulaire pour la fumée de cigarette est fournie par un matériau d'acétate de cellulose de faible résistance à l'écoulement.
  5. Elément de filtre selon l'une quelconque des revendications 1 à 4, caractérisé en ce que de nombreuses ouvertures de ventilation sont fournies à travers un emballage externe audit élément de filtre en communication avec ladite voie d'écoulement annulaire pour faciliter la dispersion du monoxyde du carbone dans la fumée de cigarette s'écoulant dans ladite voie d'écoulement annulaire.
  6. Elément de filtre selon l'une quelconque des revendications 1 à 5, caractérisé en ce que au moins une ouverture est fournie à travers ledit cylindre allongé, adjacente à l'extrémité amont de l'élément de filtre pour permettre un passage préférentiel de la fumée de cigarette à partir dudit tampon allongé à travers ladite au moins une ouverture vers ladite voie d'écoulement annulaire pendant la formation initiale de fumée d'une cigarette à laquelle l'élément de filtre est fixé.
  7. Elément de filtre selon l'une quelconque des revendications 1 à 6, caractérisé en ce qu'un moyen de blocage de la voie d'écoulement de la fumée de tabac est disposé à l'extrémité aval de l'élément de filtre pour permettre à la fumée du tabac filtrée de passer uniquement à partir de la voie d'écoulement annulaire.
  8. Elément de filtre selon l'une quelconque des revendications 1 à 7, caractérisé en ce que chacune des fibres microfines dans ledit cylindre présente un diamètre de 0,5 à 10 microns.
  9. Elément de filtre selon l'une quelconque des revendications 1 à 8, caractérisé en ce que ledit cylindre de fibres microfines présente une épaisseur de 0,5 à 4 mm et une densité de 0,05 à 0,3 g/cm3.
EP92916991A 1991-08-08 1992-08-07 Regulation de la chimie de la fumee des cigarettes Expired - Lifetime EP0599897B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB919117118A GB9117118D0 (en) 1991-08-08 1991-08-08 Control of cigarette smoke chemistry
GB9117118 1991-08-08
PCT/CA1992/000344 WO1993002575A1 (fr) 1991-08-08 1992-08-07 Regulation de la chimie de la fumee des cigarettes

Publications (2)

Publication Number Publication Date
EP0599897A1 EP0599897A1 (fr) 1994-06-08
EP0599897B1 true EP0599897B1 (fr) 1999-07-21

Family

ID=10699690

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92916991A Expired - Lifetime EP0599897B1 (fr) 1991-08-08 1992-08-07 Regulation de la chimie de la fumee des cigarettes

Country Status (9)

Country Link
EP (1) EP0599897B1 (fr)
JP (1) JPH07503603A (fr)
AT (1) ATE182249T1 (fr)
AU (1) AU668876B2 (fr)
CA (1) CA2114128C (fr)
DE (1) DE69229635T2 (fr)
GB (1) GB9117118D0 (fr)
WO (1) WO1993002575A1 (fr)
ZA (1) ZA925956B (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8529852D0 (en) * 1985-12-04 1986-01-15 Rothmans Of Pall Mall Sculptured cigarette
GB8823902D0 (en) * 1988-10-12 1988-11-16 Rothmans Int Tobacco Cigarette filter rod elements & cigarettes incorporating such filter rod elements
JP2701974B2 (ja) * 1989-03-02 1998-01-21 ロスマンズ、ベンソン アンド ヘッジズ、インコーポレイテッド タール流出のプロフィルが一様なフィルタ
GB8916137D0 (en) * 1989-07-14 1989-08-31 Rothmans Int Tobacco Cigarettes
GB9008887D0 (en) * 1990-04-20 1990-06-20 Rothmans Benson & Hedges Cigarette smoke filter

Also Published As

Publication number Publication date
DE69229635T2 (de) 2000-03-16
JPH07503603A (ja) 1995-04-20
AU668876B2 (en) 1996-05-23
ZA925956B (en) 1993-04-28
DE69229635D1 (de) 1999-08-26
GB9117118D0 (en) 1991-09-25
ATE182249T1 (de) 1999-08-15
AU2417692A (en) 1993-03-02
CA2114128A1 (fr) 1993-02-18
CA2114128C (fr) 1999-10-12
EP0599897A1 (fr) 1994-06-08
WO1993002575A1 (fr) 1993-02-18

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