EP0797931B1 - Dual section ventilated cigarette filter with flavour containing sleeve - Google Patents

Dual section ventilated cigarette filter with flavour containing sleeve Download PDF

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Publication number
EP0797931B1
EP0797931B1 EP97400514A EP97400514A EP0797931B1 EP 0797931 B1 EP0797931 B1 EP 0797931B1 EP 97400514 A EP97400514 A EP 97400514A EP 97400514 A EP97400514 A EP 97400514A EP 0797931 B1 EP0797931 B1 EP 0797931B1
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EP
European Patent Office
Prior art keywords
cigarette
filter
segment
tobacco
wrapper
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
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EP97400514A
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German (de)
French (fr)
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EP0797931A1 (en
Inventor
Jean-Claude Battard
Daniel Prigent
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Societe Nationale dExploitation Industrielle des Tabacs et Allumettes SAS
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Societe Nationale dExploitation Industrielle des Tabacs et Allumettes SAS
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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
    • A24D3/04—Tobacco smoke filters characterised by their shape or structure
    • A24D3/043—Tobacco smoke filters characterised by their shape or structure with ventilation means, e.g. air dilution
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
    • A24B15/00—Chemical features or treatment of tobacco; Tobacco substitutes, e.g. in liquid form
    • A24B15/18—Treatment of tobacco products or tobacco substitutes
    • A24B15/28—Treatment of tobacco products or tobacco substitutes by chemical substances
    • A24B15/281—Treatment of tobacco products or tobacco substitutes by chemical substances the action of the chemical substances being delayed
    • A24B15/282—Treatment of tobacco products or tobacco substitutes by chemical substances the action of the chemical substances being delayed by indirect addition of the chemical substances, e.g. in the wrapper, in the case
    • 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

Definitions

  • the present invention relates to a double section ventilated filter cigarette filter, flavored by the sheathing of the filter, and designed to deliver smoke with a relatively low tar content, for example at most of the order of 1 mg.
  • EP 0101 173 discloses cigarettes with a ventilated filter in which the two sections are spaced from one another and have a good transfer coefficient of the flavoring agent mixed with tobacco. This solution also has the disadvantage of requiring relatively large quantities important flavoring products.
  • the object of the invention is to achieve the objectives previously set out in avoiding the drawbacks of all these known solutions.
  • the invention allows the production of a cigarette very low tar yield ( ⁇ 1 mg), for example between 0.5 and 1 mg and yet exhibiting good pull strength and taste substantially constant, regardless of the smoke flow, drawn in by the smoker.
  • the invention is not limited to the production of cigarettes lightweight with tar yields ⁇ 1 mg. Indeed, the invention also applies to the production of light cigarettes, the tar yield can be up to 3 to 5 mg. In this case ventilation and the draft resistance of the section located on the tobacco side must be adapted.
  • the cigarette consists of a cylindrical tobacco section T 1 housed in a paper envelope E 1 , of a filter whose two sections T 2 , T 3 are axially contiguous, of a flavored thick cladding G 1 which surrounds the filter section T 3 located on the mouth side, an assembly cladding G 2 of the two filter sections T 2 , T 3 and a microperforated assembly sleeve M 1 , of the filter on the tobacco section T 1 .
  • the tobacco section T 1 comprises a tobacco + expanded tobacco (TE) mixture comprising approximately from 40% to 100% of TE.
  • the section T 1 has a combustion speed ranging from 7 to 10 mm / min, so as to deliver from 5 to 7 standardized puffs, preferably from 5.5 to 6 puffs.
  • the paper envelope E 1 which surrounds the tobacco is highly permeable, the porosity possibly ranging from 40 to 120 people, preferably 40 to 80 people for a yield of 0.5 to 1 mg respectively. It is impregnated with 1.5 to 3% of sodium citrate and is highly charged (from 29 to 35% of Ca CO 3 ).
  • the filter section T 3 located on the mouth side is made of cellulose acetate or an equivalent product preferably of low resistance to draft, for example of the order of 0.15 -0.20 kPa (15 to 20 mm of EC ), and negligible tar retention. This resistance to draft could however be increased to 0.29 kPa (30 mm CE).
  • the filter section T 2 located on the tobacco side which can be produced from paper has, for its part, a high resistance to draft, for example of the order of 1.08 to 1.76 kPa (110 to 180 mm of EC), (preferably 1.47 kPa (150 mm CE) for a 0.5 mg cigarette and 1.27 kPa (130 mm CE) for a 1 mg cigarette) and is highly retentive in tar: tar retention could go down 65% for a 1 mg cigarette but would preferably be greater than 80% for a 0.5 mg cigarette.
  • the cladding G 1 is made of porous material previously loaded with aromatic substances (for example by gravure printing), preferably on the internal face of the filter.
  • This cladding G 1 can consist of a thick porous cladding, reference “Stiff 200" from the Company “De Mauduit” impregnated by rotogravure with an aromatic composition at a rate of 0.4 to 1.1 g / m 2 in the form of a solution or suspension.
  • This porous cladding G 1 could consist of any other paper or porous vegetable or synthetic material of equivalent characteristic.
  • the assembly cladding G 2 of the two filter sections T 2 , T 3 can be of the same nature as the cladding G 1 . It can also be loaded with aromatic compounds.
  • the cuff M 1 is a conventional perforated or porous assembly cuff giving ventilation of the cigarette of the order of 60 to 80%, preferably of the order of 72% for a cigarette of 0.5 mg and 65 % for a 1 mg cigarette, the perforations P being located in an area located substantially at the junction between the two sections T 2 , T 3 (for example 13 mm from the end of the cigarette, mouth side) .
  • the ventilation current V A which propagates in an annular zone surrounding the smoke current V F has an intensity which decreases from the periphery, in the direction of the central axis X, X '.
  • this ventilation flow V A propagates in the annular aromatization zone of the porous cladding G 1 , the aromatic power of which decreases going towards the central axis X, X '.
  • the aromatization of the ventilation air flow V A is therefore carried out optimally and, taking into account the level of ventilation necessary for obtaining the low level of tar sought, the flow rate of this flow V A is relatively large.
  • the smoke current V F passing through the section T 2 which is therefore at a relatively high temperature and which circulates in the central region of the section T 3 , only licks a small part of the porous cladding G 1 .
  • This cladding G 1 (or the part of the cladding G ′ 1 according to the envisaged construction shown in FIG. 4) which is constantly ventilated, remains at a substantially constant temperature (ambient air temperature).
  • the filter has a length of 25 mm.
  • the filter section T 2 with a high RT (made of very retentive filter material such as, for example, paper or a filter material sold under the brand CREST by the company Filtrona International Ltd) has a length of 16 mm, essential to obtain sufficient draft resistance (RT).
  • the perforations P are then placed far enough back from the mouth side end of the cigarette (about 13 mm) and extend axially in an annular ventilation zone V 6 mm wide.
  • the ventilation zone V extends partially above the filter section T 2 which is equipped with a porous cladding G 3 .
  • the filter section T 3 is covered with a porous, flavored cladding G 1 .
  • the perforations can be placed on the section T 3 at low RT and the cladding G 3 of the section T 2 at high RT can be waterproof.
  • the invention is not limited to the embodiment described above.
  • two flavored cladding G 1 , G 2 which can be impregnated with two respective sets of different aromatic compounds whose different partial adsorption on paper and acetate would modify the perception by the smoker.
  • adsorbents in the paper filter part such as, for example, activated carbon, either in the paper matrix, or during the manufacture of the filtering section by welding, or even bonding.
  • the filter with a length of 30 mm could have, on the tobacco side, a section T 2 with strong RT of length with a length of 23 mm and, on the mouth side a section T 3 of cellulose acetate, 7 mm long.
  • the perforations made on the cuff M 1 which extend over a length of approximately 6 mm are arranged opposite the section T 2 , in an area of approximately 6 mm situated on the side of the section T 3 (at 13 mm from l 'mouth side end).
  • the sheathing G ' 1 of the section T 2 which is relatively thick and porous, is flavored.
  • This cladding G ′ 1 extends under the ventilation zone so as to be licked by the current of ventilation air coming from the ventilation orifices, over a length sufficient to flavor the smoke.
  • the sheath G 1 of the section T 1 thinner and more rigid, is not necessarily flavored. It makes it possible to prevent the smoker's mouth from coming directly into contact with the sheathing G ' 1 .
  • the length of the filter could be different, for example 20 mm, the ratio of the lengths of the two sections T 2 , T 3 being kept substantially constant.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Cigarettes, Filters, And Manufacturing Of Filters (AREA)
  • Paper (AREA)

Abstract

The cigarette has a filter attached to the end of its section (T1) containing the tobacco, the filter being made in two sections (T2, T3), joined to one another and to the section with the tobacco by an outer sleeve (M1) with perforations (P). The filter section (T3) nearest the mouth has a lower resistance to draw, while the section (T2) between it and the tobacco has a higher resistance to draw. The two sections of the filter are joined together end to end with no gap between, and the portion of the filter after the perforations is surrounded by a thick porous sleeve (G1) impregnated with aromatic substances. The second portion (T3) of the filter is made from a material such as cellulose acetate and has a negligible tar retention capacity, while the first section (T2) is of paper and has a high tar retention capacity.

Description

La présente invention concerne une cigarette à filtre ventilé à double tronçon de filtrage, aromatisée par le gainage du filtre, et conçue de manière à délivrer une fumée présentant une teneur en goudron relativement basse, par exemple au plus de l'ordre de 1 mg.The present invention relates to a double section ventilated filter cigarette filter, flavored by the sheathing of the filter, and designed to deliver smoke with a relatively low tar content, for example at most of the order of 1 mg.

Elle concerne plus particulièrement, mais non exclusivement, des cigarettes dites hyperlégères ayant une teneur en goudron de l'ordre 0,5 et 1 mg et une résistance au tirage (RT) supérieure à 0,64 kPa (65 mm de CE), de préférence voisine de 0,88 kPa (90 mm de CE), et délivrant une fumée primaire ayant un caractère aromatique jugé équivalent à des produits antérieurs ayant une teneur en goudron beaucoup plus importante.It relates more particularly, but not exclusively, to cigarettes say hyperlights with a tar content of the order of 0.5 and 1 mg and a draft resistance (RT) greater than 0.64 kPa (65 mm CE), preferably close to 0.88 kPa (90 mm WC), and delivering primary smoke having an aromatic character found to be equivalent to earlier products with tar content much more important.

D'une manière générale, on sait qu'on a déjà proposé de fabriquer des cigarettes ayant un rendement en goudron voisin de 1 mg en ajoutant dans le mélange de tabac des substances aromatiques destinées à renforcer le goût de la fumée délivrée. Il s'avère que pour obtenir un rendement de ce type, il est nécessaire d'utiliser un filtre fortement rétentif en goudron et présentant, de ce fait, une forte résistance au tirage et de prévoir une très forte ventilation. Or, cette nécessité de ventiler très fortement ne permet pas de réduire la teneur en goudron sans altérer la force aromatique de la fumée, laquelle devient rapidement inacceptable par le consommateur pour des rendements en goudron inférieurs à 1 mg. Par ailleurs, ces solutions présentent l'inconvénient de nécessiter l'emploi de quantités importantes d'arôme.In general, we know that we have already proposed to manufacture cigarettes with a tar yield close to 1 mg by adding to the tobacco mixture of aromatic substances intended to enhance the taste of smoke released. It turns out that to obtain a return of this type, it is necessary to use a highly retentive tar filter and therefore done, strong resistance to draft and provide very strong ventilation. Gold, this need to ventilate very strongly does not reduce the content of tar without altering the aromatic force of the smoke, which becomes quickly unacceptable to the consumer for tar yields less than 1 mg. Furthermore, these solutions have the disadvantage of require the use of large quantities of flavor.

Dans le but de supprimer cet inconvénient, on a également proposé de concentrer les substances aromatiques dans le filtre. Ainsi, les brevets FR 2 368 905 et EP 0 225 742 proposent d'utiliser le gainage du filtre (réalisé en matériau microporeux) comme support d'arôme. Toutefois, les solutions décrites dans ces deux documents ne permettent pas d'aboutir aux résultats recherchés, notamment en ce qui concerne le compromis rendement en goudron/résistance au tirage/aromatisation.In order to eliminate this drawback, it has also been proposed to concentrate the aromatic substances in the filter. Thus, the FR patents 2,368,905 and EP 0 225 742 propose to use the sheathing of the filter (produced in microporous material) as a flavor carrier. However, the solutions described in these two documents do not lead to results sought, in particular with regard to the yield compromise in tar / resistance to draft / flavoring.

Le brevet EP 0101 173 divulgue, quant à lui, des cigarettes à filtre ventilé dans lequel les deux tronçons sont espacés l'un de l'autre et présentent un bon coefficient de transfert de l'agent aromatisant mélangé au tabac. Cette solution présente, elle aussi, l'inconvénient de nécessiter des quantités relativement importantes de produits aromatisants.EP 0101 173 discloses cigarettes with a ventilated filter in which the two sections are spaced from one another and have a good transfer coefficient of the flavoring agent mixed with tobacco. This solution also has the disadvantage of requiring relatively large quantities important flavoring products.

L'invention a pour but d'atteindre les objectifs précédemment exposés en évitant les inconvénients de toutes ces solutions connues.The object of the invention is to achieve the objectives previously set out in avoiding the drawbacks of all these known solutions.

Elle propose, à cet effet, une cigarette comprenant :

  • un filtre assemblé à un tronçon tabac par une manchette d'assemblage comprenant une zone de ventilation, et présentant, côté bouche, un tronçon de filtre à faible résistance au tirage et, côté tabac, un tronçon de forte résistance au tirage, ces deux tronçons étant assemblés bout à bout sans intervalle, par l'intermédiaire d'un gainage d'assemblage, et
  • un gainage poreux épais chargé de substances aromatiques qui entoure au moins la partie du filtre située au droit ou en aval de la zone de ventilation,
  • le gainage d'assemblage et la manchette d'assemblage étant perméables à l'air au moins sur une partie de leur surface qui n'est pas en contact avec la bouche du fumeur.
To this end, it offers a cigarette comprising:
  • a filter assembled to a tobacco section by an assembly sleeve comprising a ventilation zone, and having, on the mouth side, a section of filter with low draft resistance and, on the tobacco side, a section of high draft resistance, these two sections being joined end to end without gap, by means of an assembly sheath, and
  • a thick porous cladding loaded with aromatic substances which surrounds at least the part of the filter situated at the right or downstream of the ventilation zone,
  • the assembly cladding and the assembly cuff being permeable to air at least over a part of their surface which is not in contact with the mouth of the smoker.

Grâce à ces dispositions, et comme cela sera décrit dans la suite, quand la fumée entre dans la bouche du fumeur, elle est "canalisée" par de l'air aromatisé (à aromatisation constante).Thanks to these provisions, and as will be described below, when the smoke enters the smoker's mouth, it is "channeled" by air flavored (constant flavoring).

Il importe de noter que l'invention permet la réalisation d'une cigarette à rendement en goudron très faible (< 1 mg), par exemple compris entre 0,5 et 1 mg et présentant cependant une bonne résistance au tirage et un goût sensiblement constant, quel que soit le débit de fumée, aspirée par le fumeur.It is important to note that the invention allows the production of a cigarette very low tar yield (<1 mg), for example between 0.5 and 1 mg and yet exhibiting good pull strength and taste substantially constant, regardless of the smoke flow, drawn in by the smoker.

Toutefois, l'invention ne se limite pas à la réalisation de cigarettes hyperlégères présentant des rendements en goudron < 1 mg. En effet, l'invention s'applique également à la réalisation de cigarettes légères dont le rendement en goudron peut s'élever jusqu'à 3 à 5 mg. Dans ce cas, la ventilation et la résistance au tirage du tronçon situé côté tabac doivent être adaptées.However, the invention is not limited to the production of cigarettes lightweight with tar yields <1 mg. Indeed, the invention also applies to the production of light cigarettes, the tar yield can be up to 3 to 5 mg. In this case ventilation and the draft resistance of the section located on the tobacco side must be adapted.

Des modes d'exécution de l'invention seront décrits ci-après, à titre d'exemples non limitatifs, avec référence aux dessins annexés dans lesquels :

  • La figure 1 est une coupe axiale schématique d'une cigarette, qui met en relief les effets et les résultats obtenus grâce aux dispositions selon l'invention ;
  • Les figures 2 à 4 sont trois demi-coupes axiales schématiques de trois variantes d'exécution de la cigarette selon l'invention.
    • Embodiments of the invention will be described below, by way of nonlimiting examples, with reference to the appended drawings in which:
  • Figure 1 is a schematic axial section of a cigarette, which highlights the effects and results obtained through the arrangements according to the invention;
  • Figures 2 to 4 are three schematic axial half-sections of three alternative embodiments of the cigarette according to the invention.

    • Dans l'exemple représenté sur la figure 1, la cigarette se compose d'un tronçon tabac cylindrique T1 logé dans une enveloppe papier E1, d'un filtre dont les deux tronçons T2, T3 sont axialement jointifs, d'un gainage épais aromatisé G1 qui entoure le tronçon de filtre T3 situé côté bouche, d'un gainage d'assemblage G2 des deux tronçons de filtre T2, T3 et d'une manchette d'assemblage microperforée M1, du filtre sur le tronçon tabac T1.In the example shown in FIG. 1, the cigarette consists of a cylindrical tobacco section T 1 housed in a paper envelope E 1 , of a filter whose two sections T 2 , T 3 are axially contiguous, of a flavored thick cladding G 1 which surrounds the filter section T 3 located on the mouth side, an assembly cladding G 2 of the two filter sections T 2 , T 3 and a microperforated assembly sleeve M 1 , of the filter on the tobacco section T 1 .

    Le tronçon tabac T1 comprend un mélange tabac + tabac expansé (TE) comprenant environ de 40% à 100% de TE. Le tronçon T1 a une vitesse de combustion allant de 7 à 10 mm/mn, de façon à délivrer de 5 à 7 bouffées normalisées, de préférence de 5,5 à 6 bouffées.The tobacco section T 1 comprises a tobacco + expanded tobacco (TE) mixture comprising approximately from 40% to 100% of TE. The section T 1 has a combustion speed ranging from 7 to 10 mm / min, so as to deliver from 5 to 7 standardized puffs, preferably from 5.5 to 6 puffs.

    L'enveloppe papier E1 qui entoure le tabac est fortement perméable, la porosité pouvant aller de 40 à 120 pers, de préférence 40 à 80 pers pour un rendement de respectivement 0,5 à 1 mg. Elle est imprégnée de 1,5 à 3% de citrate de sodium et est fortement chargée (de 29 à 35% de Ca CO3).The paper envelope E 1 which surrounds the tobacco is highly permeable, the porosity possibly ranging from 40 to 120 people, preferably 40 to 80 people for a yield of 0.5 to 1 mg respectively. It is impregnated with 1.5 to 3% of sodium citrate and is highly charged (from 29 to 35% of Ca CO 3 ).

    Le tronçon de filtre T3 situé côté bouche est réalisé en acétate de cellulose ou en un produit équivalent de préférence de faible résistance au tirage, par exemple de l'ordre de 0,15 -0,20 kPa(15 à 20 mm de CE), et de rétention goudron négligeable. Cette résistance au tirage pourrait cependant être portée jusqu'à 0,29 kPa (30 mm de CE). Le tronçon de filtre T2 situé côté tabac qui est réalisable en papier présente, quant à lui, une forte résistance au tirage, par exemple de l'ordre de 1,08 à 1,76 kPa (110 à 180 mm de CE),(de préférence 1,47 kPa (150 mm de CE) pour une cigarette de 0,5 et 1,27 kPa (130 mm de CE) pour une cigarette de 1 mg) et est fortement rétentif en goudron : la rétention goudron pourrait descendre à 65% pour une cigarette de 1 mg mais serait de préférence supérieure à 80% pour une cigarette de 0,5 mg.
    Le gainage G1 est réalisé en matière poreuse préalablement chargée de substances aromatiques (par exemple par héliogravure), de préférence sur la face interne du filtre. Ce gainage G1 peut consister en un gainage poreux épais, référence "Stiff 200" de la Société "De Mauduit" imprégné par héliogravure d'une composition aromatique à raison de 0,4 à 1,1 g/m2 sous forme d'une solution ou suspension. Ce gainage poreux G1 pourrait consister en tout autre papier ou matière poreuse végétale ou synthétique de caractéristique équivalente.    The filter section T 3 located on the mouth side is made of cellulose acetate or an equivalent product preferably of low resistance to draft, for example of the order of 0.15 -0.20 kPa (15 to 20 mm of EC ), and negligible tar retention. This resistance to draft could however be increased to 0.29 kPa (30 mm CE). The filter section T 2 located on the tobacco side which can be produced from paper has, for its part, a high resistance to draft, for example of the order of 1.08 to 1.76 kPa (110 to 180 mm of EC), (preferably 1.47 kPa (150 mm CE) for a 0.5 mg cigarette and 1.27 kPa (130 mm CE) for a 1 mg cigarette) and is highly retentive in tar: tar retention could go down 65% for a 1 mg cigarette but would preferably be greater than 80% for a 0.5 mg cigarette.
    The cladding G 1 is made of porous material previously loaded with aromatic substances (for example by gravure printing), preferably on the internal face of the filter. This cladding G 1 can consist of a thick porous cladding, reference "Stiff 200" from the Company "De Mauduit" impregnated by rotogravure with an aromatic composition at a rate of 0.4 to 1.1 g / m 2 in the form of a solution or suspension. This porous cladding G 1 could consist of any other paper or porous vegetable or synthetic material of equivalent characteristic.

    Le gainage d'assemblage G2 des deux tronçons de filtre T2, T3 peut être de même nature que le gainage G1. Il peut être également chargé de composés aromatiques.The assembly cladding G 2 of the two filter sections T 2 , T 3 can be of the same nature as the cladding G 1 . It can also be loaded with aromatic compounds.

    La manchette M1 est une manchette d'assemblage perforée ou poreuse classique donnant une ventilation de la cigarette de l'ordre de 60 à 80%, de préférence de l'ordre de 72% pour une cigarette de 0,5 mg et de 65% pour une cigarette de 1 mg, les perforations P se trouvant disposées dans une zone située sensiblement au niveau de la jonction entre les deux tronçons T2, T3 (par exemple à 13 mm de l'extrémité de la cigarette, côté bouche).The cuff M 1 is a conventional perforated or porous assembly cuff giving ventilation of the cigarette of the order of 60 to 80%, preferably of the order of 72% for a cigarette of 0.5 mg and 65 % for a 1 mg cigarette, the perforations P being located in an area located substantially at the junction between the two sections T 2 , T 3 (for example 13 mm from the end of the cigarette, mouth side) .

    Le phénomène exploité grâce à la cigarette précédemment décrite est alors le suivant :The phenomenon exploited thanks to the cigarette previously described is then the next :

    Lorsque le fumeur fume la cigarette, il exerce, pendant la phase d'aspiration de la fumée, une dépression sensiblement constante sur toute la section d'entrée du tronçon de filtre T3 situé côté bouche.When the smoker smokes the cigarette, he exerts, during the smoke suction phase, a substantially constant depression over the entire inlet section of the filter section T 3 located on the mouth side.

    Cette dépression qui se reporte d'une façon hétérogène au niveau de la section d'entrée du tronçon de filtre T2, engendre à la fois :

    • un courant de ventilation annulaire VA dont l'intensité décroít en direction de l'axe central X, X', et
    • un courant de fumée VF provenant de la combustion du tabac et qui passe au travers du tronçon de filtre T2.
    This depression, which is transferred in a heterogeneous manner at the level of the inlet section of the filter section T 2 , generates both:
    • an annular ventilation current V A whose intensity decreases towards the central axis X, X ', and
    • a current of smoke V F coming from the combustion of tobacco and which passes through the filter section T 2 .

    Compte tenu du fait qu'au niveau de la section d'entrée du tronçon de filtre T2 la dépression n'est pas constante mais décroít à partir du centre vers la périphérie en raison de la présence du courant d'air de ventilation VA, le courant de fumée VF se concentre dans la région centrale du tronçon de filtre T3.Taking into account that at the level of the inlet section of the filter section T 2 the vacuum is not constant but decreases from the center towards the periphery due to the presence of the ventilation air flow V A , the smoke current V F is concentrated in the central region of the filter section T 3 .

    Par contre, le courant de ventilation VA qui se propage dans une zone annulaire entourant le courant de fumée VF présente une intensité qui décroít de la périphérie, en direction de l'axe central X, X'.On the other hand, the ventilation current V A which propagates in an annular zone surrounding the smoke current V F has an intensity which decreases from the periphery, in the direction of the central axis X, X '.

    En fait, ce flux de ventilation VA se propage dans la zone annulaire d'aromatisation du gainage poreux G1 dont le pouvoir aromatique décroít en allant vers l'axe central X, X'.In fact, this ventilation flow V A propagates in the annular aromatization zone of the porous cladding G 1 , the aromatic power of which decreases going towards the central axis X, X '.

    L'aromatisation du flux d'air de ventilation VA s'effectue donc de façon optimale et, compte tenu du niveau de ventilation nécessaire à l'obtention du faible niveau de goudron recherche, le débit de ce flux VA est relativement important.The aromatization of the ventilation air flow V A is therefore carried out optimally and, taking into account the level of ventilation necessary for obtaining the low level of tar sought, the flow rate of this flow V A is relatively large.

    Par ailleurs, le courant de fumée VF traversant le tronçon T2, qui se trouve donc à une température relativement élevée et qui circule dans la région centrale du tronçon T3, ne lèche au plus qu'une faible partie du gainage poreux G1. Ce gainage G1 (ou la partie du gainage G'1 selon la construction envisagée représentée figure 4) qui se trouve constamment ventilé, demeure à une température sensiblement constante (température de l'air ambiant). Il ne subit donc pas une élévation de température pouvant provoquer l'évaporation prématurée des substances aromatiques qu'il contient, de sorte que l'aromatisation du mélange gazeux aspiré par le fumeur demeure constante dans le temps et ne décroít pas rapidement, comme ce serait le cas si seul le courant de fumée chaud venait lécher la totalité du gainage poreux aromatisé G1, G'1. Furthermore, the smoke current V F passing through the section T 2 , which is therefore at a relatively high temperature and which circulates in the central region of the section T 3 , only licks a small part of the porous cladding G 1 . This cladding G 1 (or the part of the cladding G ′ 1 according to the envisaged construction shown in FIG. 4) which is constantly ventilated, remains at a substantially constant temperature (ambient air temperature). It therefore does not undergo a rise in temperature which can cause premature evaporation of the aromatic substances which it contains, so that the aromatization of the gas mixture sucked in by the smoker remains constant over time and does not decrease rapidly, as it would the case if only the current of hot smoke came to lick all of the porous cladding flavored G 1 , G ′ 1 .

    En outre, une particularité de cette solution réside dans le fait que quand le mélange gazeux pénètre dans la bouche du fumeur, le courant de fumée VF est canalisé et en quelque sorte enveloppé par de l'air aromatisé du courant de ventilation qui vient en priorité au contact des papilles gustatives et olfactives. Le goût de cette cigarette est donc sensiblement indépendant de la quantité de tabac fumé, (le goût de la cigarette et son intensité étant essentiellement apportés par l'aromatisation du filtre).In addition, a peculiarity of this solution lies in the fact that when the gaseous mixture enters the mouth of the smoker, the smoke current V F is channeled and in a way enveloped by aromatized air from the ventilation current which comes in priority in contact with taste and olfactory taste buds. The taste of this cigarette is therefore substantially independent of the amount of smoked tobacco, (the taste of the cigarette and its intensity being essentially provided by the flavoring of the filter).

    Dans le mode d'exécution représenté sur la figure 2, le filtre présente une longueur de 25 mm. Dans ce cas, le tronçon de filtre T2 à forte RT (en matériau filtrant très rétentif comme, par exemple, le papier ou un matériau filtrant vendu sous la marque CREST par la Société Filtrona International Ltd) présente une longueur de 16 mm, indispensable pour l'obtention d'une résistance au tirage (RT) suffisante. Les perforations P sont alors disposées suffisamment en retrait de l'extrémité côté bouche de la cigarette (environ 13 mm) et s'étendent axialement dans une zone annulaire de ventilation V de 6 mm de largeur. La zone de ventilation V s'étend partiellement au-dessus du tronçon de filtre T2 qui est équipé d'un gainage poreux G3. Le tronçon de filtre T3 est, quant à lui, recouvert d'un gainage poreux aromatisé G1.In the embodiment shown in Figure 2, the filter has a length of 25 mm. In this case, the filter section T 2 with a high RT (made of very retentive filter material such as, for example, paper or a filter material sold under the brand CREST by the company Filtrona International Ltd) has a length of 16 mm, essential to obtain sufficient draft resistance (RT). The perforations P are then placed far enough back from the mouth side end of the cigarette (about 13 mm) and extend axially in an annular ventilation zone V 6 mm wide. The ventilation zone V extends partially above the filter section T 2 which is equipped with a porous cladding G 3 . The filter section T 3 is covered with a porous, flavored cladding G 1 .

    Dans le cas où on choisit un filtre de 30 mm (figure 3), les perforations peuvent être placées sur le tronçon T3 à faible RT et le gainage G3 du tronçon T2 à forte RT peut être imperméable.In the case where a 30 mm filter is chosen (FIG. 3), the perforations can be placed on the section T 3 at low RT and the cladding G 3 of the section T 2 at high RT can be waterproof.

    Bien entendu, l'invention ne se limite pas au mode d'exécution précédemment décrit. Ainsi, il est possible d'utiliser deux gainages aromatisés G1, G2 qui peuvent être imprégnés de deux ensembles respectifs de composés aromatiques différents dont l'adsorption partielle différente sur le papier et l'acétate modifierait la perception par le fumeur. Par ailleurs, il est possible d'incorporer dans la partie filtre papier des adsorbants tels que par exemple du charbon actif, soit dans la matrice papier, soit pendant la fabrication du tronçon filtrant par soupoudrage, voire collage.Of course, the invention is not limited to the embodiment described above. Thus, it is possible to use two flavored cladding G 1 , G 2 which can be impregnated with two respective sets of different aromatic compounds whose different partial adsorption on paper and acetate would modify the perception by the smoker. Furthermore, it is possible to incorporate adsorbents in the paper filter part such as, for example, activated carbon, either in the paper matrix, or during the manufacture of the filtering section by welding, or even bonding.

    De même, conformément au mode d'exécution illustré sur la figure 4, le filtre d'une longueur de 30 mm pourrait présenter, côté tabac, un tronçon T2 à forte RT de longueur d'une longueur de 23 mm et, côté bouche un tronçon T3 en acétate de cellulose, de longueur de 7 mm. Les perforations réalisées sur la manchette M1 qui s'étendent sur une longueur d'environ 6 mm sont disposées en regard du tronçon T2, dans une zone d'environ 6 mm située du côté du tronçon T3 (à 13 mm de l'extrémité côté bouche). Dans cet exemple, le gainage G'1 du tronçon T2, relativement épais et poreux, est aromatisé. Ce gainage G'1 s'étend sous la zone de ventilation de manière à être léché par le courant d'air de ventilation provenant des orifices de ventilation, sur une longueur suffisante pour aromatiser la fumée.Similarly, in accordance with the embodiment illustrated in FIG. 4, the filter with a length of 30 mm could have, on the tobacco side, a section T 2 with strong RT of length with a length of 23 mm and, on the mouth side a section T 3 of cellulose acetate, 7 mm long. The perforations made on the cuff M 1 which extend over a length of approximately 6 mm are arranged opposite the section T 2 , in an area of approximately 6 mm situated on the side of the section T 3 (at 13 mm from l 'mouth side end). In this example, the sheathing G ' 1 of the section T 2 , which is relatively thick and porous, is flavored. This cladding G ′ 1 extends under the ventilation zone so as to be licked by the current of ventilation air coming from the ventilation orifices, over a length sufficient to flavor the smoke.

    Le gainage G1 du tronçon T1, plus mince et plus rigide, n'est pas nécessairement aromatisé. Il permet d'éviter que la bouche du fumeur ne vienne directement au contact du gainage G'1.The sheath G 1 of the section T 1 , thinner and more rigid, is not necessarily flavored. It makes it possible to prevent the smoker's mouth from coming directly into contact with the sheathing G ' 1 .

    Bien entendu, la longueur du filtre pourrait être différente, par exemple de 20 mm, le rapport des longueurs des deux tronçons T2, T3 étant maintenu sensiblement constant.Of course, the length of the filter could be different, for example 20 mm, the ratio of the lengths of the two sections T 2 , T 3 being kept substantially constant.

    Claims (21)

    1. A cigarette with ventilated filter, dual filtering segment, flavoured by the wrapper, characterized in that the filter, which is assembled to a tobacco segment (T1) by means of an assembly sleeve (M1), comprises a ventilation area and has, at the mouth end, a low resistance-to-drag filter segment (T3), and, at the tobacco end, a high resistance-to-drag segment (T2), these two segments (T2, T3) being assembled end-to-end without any space in between, by means of an assembly wrapper (G2), at least the filter portion (T3) situated at or downstream of the ventilation area being surrounded by a thick porous wrapper (G1, G'1) carrying flavouring substances, whereas the assembly wrapper (G2) and assembly sleeve (M1) are permeable to air at least at one part of their area which is not in contact with the smoker's mouth.
    2. A cigarette as claimed in claim 1, characterized in that at least the segment (T3) situated at the mouth end is surrounded by a thick porous wrapper (G1) carrying flavouring substances, whereas the assembly wrapper (G2) and assembly sleeve (M,) are permeable to air at least substantially at the junction of the two segments (T2, T3) .
    3. A cigarette as claimed in claim 1, characterized in that the segment (T2) situated at the tobacco end is wrapped in a thick, porous, flavoured wrapper (G'1) which extends under the ventilation area so as to be brushed against by the ventilation airstream coming from the ventilation holes.
    4. A cigarette as claimed in claim 3, characterized in that the wrapper (G1) of segment (T1) is not flavoured.
    5. A cigarette as claimed in any one of the previous claims, characterized in that the tobacco segment (T1) comprises a mixture of tobacco and expanded tobacco in a proportion of 40% to 100% and has a combustion rate of the order of 7 to 10 mm per minute so as to deliver 5 to 7 standardized puffs.
    6. A cigarette as claimed in claim 5, characterized in that the number of standardized puffs is included between 5.5 and 6.
    7. A cigarette as claimed in any one of claims 1 to 5, characterized in that the tobacco segment (T1) is surrounded by an envelope (E1) of porosity included between 40 and 120 pers.
    8. A cigarette as claimed in claim 7, characterized in that the porosity of said envelope is 40 to 80 pers.
    9. A cigarette as claimed in any one of the previous claims, characterized in that the filter segment (T3) situated at the mouth end has a resistance-to-drag of the order of 0,15 to 0,29 kPa (15 to 30 mm W.G.) and negligible tar retention.
    10. A cigarette as claimed in claim 9, characterized in that said resistance-to-drag is of the order of 0,15 to 0,20 kPa (15 to 20 mm W.G.).
    11. A cigarette as claimed in claim 9, characterized in that the filter segment (T3) situated at the mouth end is made of a material such as cellulose acetate.
    12. A cigarette as claimed in any one of the previous claims, characterized in that the filter segment (T2) situated at the tobacco end has a resistance-to-drag of the order of 1,08 to 1,76 kPa (110 to 180 mm W.G.) and has high tar retention.
    13. A cigarette as claimed in claim 12, characterized in that said resistance-to-drag is 150 in the case of an 0.5-mg cigarette and 130 in the case of a 1-mg cigarette.
    14. A cigarette as claimed in claim 13, characterized in that the tar retention is of the order of 65% in the case of a 1.0-mg cigarette and 80% in the case of an 0.5-mg cigarette.
    15. A cigarette as claimed in claim 12, characterized in that the filter segment (T2) situated at the tobacco end is in paper.
    16. A cigarette as claimed in any one of the previous claims, characterized in that the porous wrapper (G1) is impregnated by photo-engraving with 0.4 to 1.1 g/m2 of a flavouring compound.
    17. A cigarette as claimed in any one of the previous claims, characterized in that the two filter segments (T2, T3) are assembled by means of an assembly wrapper (G2) of the same type as said wrapper (G1) which is also flavoured.
    18. A cigarette as claimed in any one of the previous claims, characterized in that said filter is assembled to the tobacco segment (T1) by means of a perforated or porous assembly sleeve (M1) providing cigarette ventilation of the order of 60 to 80%.
    19. A cigarette as claimed in claim 18, characterized in that said ventilation is of the order of 72% in the case of an 0.5-mg cigarette and 65% in the case of a 1-mg cigarette.
    20. A cigarette as claimed in claim 15, characterized in that adsorbents such as activated carbon are incorporated into the filter segment (T2) situated at the tobacco end.
    21. A cigarette as claimed in claim 20, characterized in that said adsorbent is incorporated into the paper matrix, or even by sprinkling or bonding during the manufacture of said segment (T2).
    EP97400514A 1996-03-29 1997-03-06 Dual section ventilated cigarette filter with flavour containing sleeve Expired - Lifetime EP0797931B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    FR9604094 1996-03-29
    FR9604094A FR2746600B1 (en) 1996-03-29 1996-03-29 DOUBLE FILTER SECTION VENTILATED FILTER CIGARETTE, FLAVORED BY THE FILTER SHEATH.

    Publications (2)

    Publication Number Publication Date
    EP0797931A1 EP0797931A1 (en) 1997-10-01
    EP0797931B1 true EP0797931B1 (en) 1999-09-01

    Family

    ID=9490803

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP97400514A Expired - Lifetime EP0797931B1 (en) 1996-03-29 1997-03-06 Dual section ventilated cigarette filter with flavour containing sleeve

    Country Status (8)

    Country Link
    EP (1) EP0797931B1 (en)
    JP (1) JP3866360B2 (en)
    AT (1) ATE183893T1 (en)
    DE (1) DE69700458T2 (en)
    DK (1) DK0797931T3 (en)
    ES (1) ES2136459T3 (en)
    FR (1) FR2746600B1 (en)
    GR (1) GR3031705T3 (en)

    Families Citing this family (12)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    JP3181248B2 (en) 1997-10-06 2001-07-03 日本たばこ産業株式会社 Cigarette with filter and filter for cigarette
    DE19746664A1 (en) * 1997-10-23 1999-05-06 Reemtsma H F & Ph Thin cigarette
    WO1999058764A1 (en) 1998-05-12 1999-11-18 Japan Tobacco Inc. Cigarette filter roll paper, cigarette filter, and filter cigarette
    US6761174B2 (en) * 2001-02-22 2004-07-13 Philip Morris Incorporated Cigarette and filter with downstream flavor addition
    ATE346513T1 (en) * 2002-09-11 2006-12-15 Hauni Maschinenbau Ag INJECTION OF A MEDIUM INTO FILTER SEGMENTS
    US7381277B2 (en) 2004-07-29 2008-06-03 R.U. Reynolds Tobacco Company Flavoring a cigarette by using a flavored filter plug wrap
    EP1797780A1 (en) * 2005-12-15 2007-06-20 Gallaher Limited Smoking article
    ES2330364T3 (en) 2006-08-04 2009-12-09 Philip Morris Products S.A. MULTICOMPONENT FILTER THAT PROVIDES IMPROVEMENTS OF MULTIPLE AROMAS.
    GB0811552D0 (en) * 2008-06-24 2008-07-30 British American Tobacco Co Filter for a smoking article
    JP5487359B2 (en) * 2011-03-31 2014-05-07 日本たばこ産業株式会社 cigarette
    GB201116565D0 (en) * 2011-09-26 2011-11-09 British American Tobacco Co Smoking article and method of manufacturing a smoking article
    GB201421803D0 (en) * 2014-12-08 2015-01-21 British American Tobacco Co A smoking article, a filter and a method of manufacturing a smoking article

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    US2998820A (en) * 1959-05-01 1961-09-05 Viola G Ades Cigarette
    US4082098A (en) * 1976-10-28 1978-04-04 Olin Corporation Flavored cigarette
    NO157125C (en) * 1982-04-08 1988-06-01 Filtrona Ltd CIGARETTE FILTER ELEMENT, ALTERNATIVE WITH AN ENVIRONMENTAL, VENTILATING NOZZLE MATERIAL.
    US4729391A (en) * 1985-11-14 1988-03-08 R. J. Reynolds Tobacco Company Microporous materials in cigarette filter construction
    US5360023A (en) * 1988-05-16 1994-11-01 R. J. Reynolds Tobacco Company Cigarette filter
    GB2229078A (en) * 1989-03-14 1990-09-19 Rothmans Int Tobacco Flavouring cigarettes
    GB8918556D0 (en) * 1989-08-15 1989-09-27 British American Tobacco Co Improvements relating to smoking articles
    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
    GB9121782D0 (en) * 1991-10-14 1991-11-27 Cigarette Components Ltd Cigarette filter containing particulate smoke modifying additive

    Also Published As

    Publication number Publication date
    ATE183893T1 (en) 1999-09-15
    FR2746600A1 (en) 1997-10-03
    JP3866360B2 (en) 2007-01-10
    EP0797931A1 (en) 1997-10-01
    JPH104944A (en) 1998-01-13
    GR3031705T3 (en) 2000-02-29
    DK0797931T3 (en) 2000-03-20
    ES2136459T3 (en) 1999-11-16
    DE69700458D1 (en) 1999-10-07
    FR2746600B1 (en) 1998-04-30
    DE69700458T2 (en) 2000-01-20

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