WO2015110137A1 - Cigarette-filtre - Google Patents

Cigarette-filtre Download PDF

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Publication number
WO2015110137A1
WO2015110137A1 PCT/EP2014/003450 EP2014003450W WO2015110137A1 WO 2015110137 A1 WO2015110137 A1 WO 2015110137A1 EP 2014003450 W EP2014003450 W EP 2014003450W WO 2015110137 A1 WO2015110137 A1 WO 2015110137A1
Authority
WO
WIPO (PCT)
Prior art keywords
band
zone
cigarette
filter
tobacco rod
Prior art date
Application number
PCT/EP2014/003450
Other languages
English (en)
Inventor
Thomas Pienemann
Original Assignee
Reemtsma Cigarettenfabriken Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Reemtsma Cigarettenfabriken Gmbh filed Critical Reemtsma Cigarettenfabriken Gmbh
Publication of WO2015110137A1 publication Critical patent/WO2015110137A1/fr

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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
    • A24D1/02—Cigars; Cigarettes with special covers
    • A24D1/025—Cigars; Cigarettes with special covers the covers having material applied to defined areas, e.g. bands for reducing the ignition propensity
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24C—MACHINES FOR MAKING CIGARS OR CIGARETTES
    • A24C5/00—Making cigarettes; Making tipping materials for, or attaching filters or mouthpieces to, cigars or cigarettes
    • A24C5/005—Treatment of cigarette paper
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24C—MACHINES FOR MAKING CIGARS OR CIGARETTES
    • A24C5/00—Making cigarettes; Making tipping materials for, or attaching filters or mouthpieces to, cigars or cigarettes
    • A24C5/14—Machines of the continuous-rod type
    • A24C5/28—Cutting-off the tobacco rod

Definitions

  • the invention relates to a filter cigarette as well as processes of manufacturing such a filter cigarette.
  • LIP low ignition propensity
  • ASTM E2187-04 standard test methods
  • FIG. 1 is a schematic longitudinal view showing a conventional LIP filter cigarette having a length l c , which comprises a tobacco rod wrapped with a cigarette paper 1 and a filter 2, both being connected by a tipping paper 3 having a length 1 T .
  • the length of the tobacco rod not covered by the tipping paper 3 is l Rf .
  • the distance d B between the bands 4 (measured centre/centre or left edge/left edge) is chosen as I RE /2.
  • the cigarette paper used for manufacturing such ciga- rettes has a regular pattern of bands 4 with a distance of d B , as shown in Figure 2. Due to the usual, unregistered way of applying the cigarette paper to the cigarettes, the position of the bands 4 on the finished cigarettes is randomly distributed, as shown in Figure 3.
  • the air permeability of the base cigarette paper and the bands can be described both in terms of porosity (driven by a pressure gradient across the paper or band, respectively) and in terms of diffusivity (driven by a concentration gradient across the paper or band, respectively) .
  • the air permeability is often expressed by diffusivity.
  • the diffusivity (diffusion capacity) can be measured as described in CORESTA Recommended Method No.
  • the object of the invention is to provide a filter cigarette that passes LIP tests and also self-extinguishes once the burning zone reaches the mouth-sided end area of the cigarette .
  • the filter cigarette according to the invention comprises a tobacco rod wrapped with a cigarette paper having a basic porosity and a filter attached to an end of the wrapped tobacco rod by means of a tipping.
  • the cigarette paper includes at least one first circumferentially extending band-like zone having a lower porosity than the basic porosity and one second circumferentially extending band-like zone having a lower porosity than the basic porosity.
  • the second band-like zone is longitudinally spaced to the at least one first band-like zone.
  • the second band-like zone has a lower diffusivity than the at least one ' first band-like zone .
  • the air permeability of the bandlike zones is expressed as porosity when compared to the porosity (basic porosity) of the cigarette paper in the areas away from the band-like zones, as measured by the well- established CORESTA Recommended Method No. 40.
  • the permeability of the band-like zones as such and when compared to each other is expressed as diffusivity D* (diffusion capacity) , as measured by the recently introduced CORESTA Recommended Method No. 77.
  • the second bandlike zone is closer to the filter than the at least one first band-like zone.
  • the distance between the second band-like zone and the rod-sided end of the tipping is less than 5 mm.
  • the second band-like zone may be adjacent to the rod-sided end of the tipping, i.e. the above distance is almost 0 mm or exactly 0 mm. The latter includes the case that there is some overlap between the second bandlike zone and the tipping; since the tipping usually is imper- vious to air, such overlap would not result in a particular effect.
  • a typical width of the second band-like zone (measured in longitudinal direction of the filter cigarette) is in the range of from 3 mm to 9 mm.
  • band-like zones with two different air permeability levels are applied to the cigarette paper in such a way that a band-like zone having a lower permeability is in close vicinity to the tipping (usually a tipping paper) at the mouth-sided end of the filter cigarette.
  • the permeability of the band-like zones is chosen in a way that the band-like zone(s) distal from the mouth-sided end (i.e. the first band-like zones (s) ) has (have) a diffusivity comparable to standard LIP cigarettes, thus allowing to pass the LIP test but minimizing free-air self- extinguishing during smoking.
  • the second band-like zone which is positioned closer to or adjacent to the tipping, has a dif- fusivity which is chosen low enough to result in extinguishing once the cigarette burning zone reaches this band-like zone. It has been found that for a reliable extinguishment at the end of smoking, the diffusivity of the second band-like zone has to be lower than 0.05 cm/s, while the diffusivity of the first band- like zone(s) can be chosen to be in the range of from 0.06 cm/s to 0.18 cm/s, as usually applied for LIP ciga- rettes. These values are expressed as diffusivity as measured by the method indicated above. Generally, in the band-like zones, the diffusivity or porosity relates to the composite comprising the cigarette paper plus the material applied to the cigarette paper for providing the band-like zones.
  • the second band-like zone may be marked, for example by colouring.
  • marking can be advantageous, e.g., for detecting the second band-like zone in a manufacturing process (see below) , or may provide a pleasant appearance of the filter ciga- rette.
  • a normally invisible marking may be preferred, e.g. by a fluorescent dye which is excited by a UV lamp during the manufacturing process.
  • all kinds of substances known in the art for that purpose can be used to provide the at least one first band-like zone and/or the second band-like zone on the cigarette paper so that the respective porosity (air permeability, diffusivity) is smaller than the basic porosity of the ciga- rette paper.
  • the at least one first band-like zone and/or the second band-like zone comprises, e.g., a starch, an alginate, guar gum, a salt of an organic acid, a burn retardant or mixtures of such substances.
  • the desired porosity can be adjusted, e.g., by the concentration of the respective substance in a solvent or slurry during the manufacturing process, as is generally known in the art and also described in more detail in the embodiments below.
  • a filter cigarette according to the invention includes one or two first band-like zones, which are spaced to each other and preferably (but not necessarily) have the same- diffusivity. Other numbers, like three, four or five, are conceivable as well.
  • a web of cigarette paper including sections which each comprise at least one transversely extending first band-like zone and one transversely extending second band-like zone is unwound from a bobbin and longitudinally wrapped around an endless tobacco rod to provide an endless wrapped tobacco rod.
  • This endless wrapped tobacco rod includes sections each comprising at least one circumferentially extending first band-like zone and one circumferentially extending second band-like zone.
  • the wrapped tobacco rod has to be cut into pieces. This cutting step is performed in register with each respective second band-like zone to ensure that, in each finished cigarette, the second band-like zone has a well-defined position with respect to the rod-sided end of the tipping.
  • the distance between the second band-like zone and the rod- sided end of the tipping is preferably small.
  • the second band- like zones can be marked by a marking (see above) , which is detected by a sensor or detector to enable the wrapped tobacco rod to be cut at the correct positions, preferably close to each respective second band-like zone.
  • the first and second band-like zones can already be applied to the cigarette paper web during the manufacturing process of the web, e.g. by printing.
  • a web of cigarette paper which includes sections each comprising at least one transversely extending first band-like zone, is unwound from a bobbin. In each one of these sections, one transversely extending second band- like zone is applied to the web.
  • the web is longitudinally wrapped around an endless tobacco rod to provide an endless wrapped tobacco rod including sections each comprising at least one circumferentially extending first band-like zone and one circumferentially extending second band-like zone.
  • the wrapped tobacco rod is cut in register with each respective second band-like zone to ensure that, in each finished cigarette, the second band-like zone has a well-defined position with respect to the rod-sided end of the tipping (i.e. preferably a small distance) .
  • the cigarette paper web upon delivery, just includes the first band-like zones, while the second band-like zones are applied to the web during the manufacturing process.
  • This allows to utilize the known spatial and temporal relation between the step of applying a respective second band-like zone to the web and the cutting step (which is essentially determined by the distance between the applying station and the cutting station as well as the speed of the web) to cut the wrapped tobacco rod in register (i.e. synchronized) with each respective second band- like zone.
  • the positions of the first band-like zones on the finished cigarettes are more randomly distributed. Any disadvantageous effect resulting therefrom can be counter-acted by using more than one first band-like zone per cigarette.
  • the second band- like zones are preferably printed onto the web on a cigarette machine during cigarette manufacturing using gravure or inkjet printing.
  • the second band- like zones can be printed onto the web with a printing ink, wherein the printing ink comprises an aqueous solution of one or more substances like starches, alginates, guar gum, organic acids, burn retardants.
  • the term "solution" also encompasses a slurry.
  • Such applied or printed second band-like zones preferably have a width, measured in longitudinal direction of the tobacco rod, in the range of from 3 mm to 9 mm and a porosity of less than 20 CU.
  • Figure 1 a schematic longitudinal view of a conventional LIP filter cigarette comprising two band-like zones having the same porosity
  • Figure 2 a top view of a web of cigarette paper used for wrapping a tobacco rod to provide filter cigarettes like that in Figure 1,
  • FIG. 3 schematic longitudinal views of several filter cigarettes manufactured by using the web of Figure 2, in which the positions of the band-like zones are randomly distributed,
  • Figure 4 a schematic longitudinal view of a first embodiment of the filter cigarette according to the invention
  • Figure 5 a top view of a web of cigarette paper used for wrapping a tobacco rod to provide filter cigarettes like that in Figure 4
  • Figure 6 schematic longitudinal views of several filter cigarettes manufactured by using the web of Figure 5, wherein the positions of the band-like zones are registered during the manufacturing process by means of a sensor or detector
  • Figure 7 a schematic longitudinal view of a second embodiment of the filter cigarette according to the invention
  • Figure 8 schematic longitudinal views of several filter cigarettes manufactured by using a web like that in Figure 2, wherein an additional band-like zone is printed onto the web in register with the position of the filters.
  • Figures 1 to 3 relate to a conventional LIP filter cigarette and a process of manufacturing such cigarettes, as explained in detail further above.
  • Figure 4 illustrates a first embodiment of a filter cigarette according to the invention, designated by 10.
  • the filter cigarette 10 comprises a tobacco rod 12, which is wrapped with a cigarette paper 14 having a basic porosity.
  • a filter 16 e.g. containing cellulose acetate, is attached to one end of the tobacco rod 12 by means of a tipping 18 (in the embodiment made of paper) .
  • the tipping 18 In the end area of the tobacco rod 12, the tipping 18 somewhat overlaps the cigarette paper 14.
  • the total length of the filter cigarette 10 is designated by l c , the length of the cigarette paper 14 by l Cp , the length of the tipping 18 by 1 T , and the difference between l c and 1 T by
  • the cigarette paper 14 comprises one first band-like zone 20, which extends circumferentially about the tobacco rod 12.
  • Figure 4 is not a pure longitudinal section, but schematic.
  • the first band-like zone 20 has a lower porosity than the basic porosity of cigarette paper 14.
  • the cigarette paper 14 comprises one second band-like zone 22, which extends circumferentially about the tobacco rod 12.
  • the second band-like zone 22 has a lower diffusivity than the first band-like zone 20.
  • the widths of the first band-like zone 20 and the second band-like zone 22 are the same.
  • the distance d B T between the rod-sided end of the tipping 18 and the closest edge of the second band-like zone 20 is generally small, preferably between 0 mm and 5 mm.
  • the distance of the first band-like zone 20 and the second band-like zone 22 (measured centre- centre, or in Figure 4 left edge-left edge) is designated by d B .
  • the first band- like zone 20 is designed as a conventional band providing LIP properties so that the filter cigarette 10, when lit, self-extinguishes (with a relatively high probability) when put on a support but does not self-extinguish (with a relatively high probability) when held in air.
  • the lower- diffusivity second band-like zone 22 reliably results in self-extinguishment of the cigarette when completely smoked and the burning zone has reached the mouth-sided end area of the tobacco rod 12.
  • the band-like zones 20 and 22 having different diffusivities are provided to a cigarette paper web at the paper manufacturing process by applying porosity-reducing substances such as alginate, starch, cellulose fibers and/or guar gum, as known to a skilled person.
  • porosity-reducing substances such as alginate, starch, cellulose fibers and/or guar gum, as known to a skilled person.
  • the band pattern can be chosen such that d B is half of l Rf .
  • the cigarette paper web used for manufacturing the cigarettes 10 has a regular pattern of band-like zones 20 and 22, see Figure 5.
  • This regular pattern has to reflect the fact that, in the common way of attaching filters to cigarettes, first a double-length rod (having a length of twice l Cp ) is cut from an endless rod of tobacco longitudinally wrapped with the web, which is then cut in the middle.
  • the two single- length rods are spaced apart and a double-length filter segment is inserted in between the two single-length rods.
  • the double- length filter segment and the two single-length rods are then combined by wrapping and gluing with a double- length tipping paper.
  • the resulting double cigarette is cut in the middle to obtain two single cigarettes.
  • double sections are arranged in a repeating pattern, wherein the length of each double section equals to twice the total length l Cp of the cigarette paper 14 in one cigarette 10.
  • the cigarette paper has to be applied in a registered way during cigarette making, as for example described for standard LIP papers in US 2005/0172977 A and WO 2011/057743 A. This results in the same positioning of the band-like zones 20, 22 in all cigarettes 10, as illustrated in Figure 6.
  • one of the bands can be marked, e.g. coloured.
  • the lower-diffusivity second band-like zone 22, proximal to the filter 16, is coloured which also assists the smoker in recognizing the self-extinguishing zone.
  • Filter cigarette 30 comprises a tobacco rod 32 wrapped with a standard LIP cigarette paper 34 and a filter 36 attached by means of a tipping 38.
  • the cigarette paper 34 includes generally two first band-like zones 40 having a lower porosity than the basic porosity of the cigarette paper 34.
  • a second band-like zone 42 having an even lower porosity or diffusivity is located in close vicinity to the rod-sided end of the tipping 38, the distance being d BT -
  • the other distances indicated in Figure 7 are like those in Figure 4.
  • the filter cigarettes 30 are manufactured by using a cigarette paper web like the web shown in Figure 2, which includes all first band-like zones 40, but on which the second band-like zones 42 are missing initially.
  • the positions of the first band-like zones 40 can vary, as depicted in Figure 8, in which individual cigarettes are designated by 50, 51, 52, 53 and 54.
  • the second band- like zone 42 always has to be applied at the same position on a filter cigarette 30 in order to ensure self- extinguishment of the cigarette only if it has been smoked al- most completely. This is achieved by applying, preferably by printing, a solution of a suitable substance at the cigarette maker after unwinding the cigarette paper web from the bobbin but before rod formation.
  • Suitable methods for printing include but are not limited to gravure printing (see WO 2006/029723 A) and inkjet printing.
  • the wrapped tobacco rod is cut in register with the respective second band-like zones 42, as also explained further above .
  • Citric acid and other organic acids are suitable means for lowering the burn rate of cigarettes when applied to the cigarette paper.
  • WO 85/04080 A describes that a cigarette paper treated with such substances reduces the ignition propensity of cigarettes. According to WO 85/04080 A, bands created by using such an acid and covering at least 50% of the cigarette paper surface area yield the desired effect.
  • suitable printing ink substances for this printing operation include:
  • Example 1 (Conventional cigarette as in Fig. 1 as a reference)
  • a cigarette rod comprising a standard American Blend tobacco having a length of 63 mm and a weight of 720 mg was combined with a standard cellulose acetate filter having a length of 21 mm using a standard tipping paper with 25 mm width (measured in longitudinal direction of the cigarette rod) .
  • the cigarette paper used for forming the rod had a basic porosity of 75 CU and equally spaced LIP bands of 7 mm width and a distance (as measured form centre to centre) of 29.5 mm.
  • the diffusivity in the band regions was set to 0.12 cm/s. 92% of these cigarettes passed the LIP test according to ASTM 2187-4.
  • Example 2 (Cigarette as in Figure 4)
  • a cigarette similar to that of Example 1 was produced with a cigarette paper having two different bands (band-like zones) .
  • the diffusivity of the first band (first band-like zone 20) was 0.12 cm/s and that of the second band (second band- like zone 22) was 0.04 cm/s.
  • the width of both bands was 7 mm and the distance between the bands was 29.5 mm.
  • the cigarette paper was applied in registered manner to ensure that the second band starts directly behind the rod- sided end of the tipping. 100% of these cigarettes passed the LIP test according to ASTM 2187-4.
  • Example 3 (Cigarette like in Figure 7)
  • Example 1 On the cigarettes of Example 1, an aqueous solution of citric acid was applied with a paint brush to create a band (second band- like zone 42) having a width of 5 mm and located on the cigarette paper directly adjacent to the tipping. The amount of citric acid in the band was 3 mg per cigarette. After application of the band, the cigarettes were stored in a controlled atmosphere of 20 °C and 60% relative humidity for one week. 98% of these cigarettes passed the LIP test according to ASTM 2187-4. In the region treated with citric acid, the permeability (porosity) of the cigarette paper was reduced from the initial value of 75 CU to less than 20 CU. When left in an ashtray, all cigarettes immediately extinguished when the burning zone reached the applied band.

Landscapes

  • Cigarettes, Filters, And Manufacturing Of Filters (AREA)

Abstract

L'invention concerne une cigarette-filtre (10) qui comprend un boudin de tabac (12) enroulé dans un papier à cigarette (14), lequel présente une porosité de base, et un filtre (16), fixé au moyen d'une manchette (18) à une extrémité du boudin de tabac (12) enroulé. Le papier à cigarette (14) comprend au moins une première zone (20) du type bande s'étendant circonférentiellement, dont la porosité est inférieure à la porosité de base, et une seconde zone (22) du type bande s'étendant circonférentiellement, dont la porosité est inférieure à la porosité de base et qui est longitudinalement espacée de la ou des première(s) zone(s) (20) du type bande. La seconde zone (22) du type bande présente un coefficient de diffusision inférieur à celui de la ou des première(s) zone(s) (20) du type bande.
PCT/EP2014/003450 2014-01-24 2014-12-19 Cigarette-filtre WO2015110137A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP14000267 2014-01-24
EP14000267.6 2014-01-24
EP14000440.9 2014-02-06
EP14000440.9A EP2898784B1 (fr) 2014-01-24 2014-02-06 Cigarette à filtre

Publications (1)

Publication Number Publication Date
WO2015110137A1 true WO2015110137A1 (fr) 2015-07-30

Family

ID=50002477

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2014/003450 WO2015110137A1 (fr) 2014-01-24 2014-12-19 Cigarette-filtre

Country Status (4)

Country Link
EP (1) EP2898784B1 (fr)
ES (1) ES2683321T3 (fr)
PL (1) PL2898784T3 (fr)
WO (1) WO2015110137A1 (fr)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1555320A (en) 1923-04-11 1925-09-29 Weil Emile Cigarette
US1996002A (en) 1933-05-25 1935-03-26 Seaman Stewart Elmer Decreasing inflammability of cigarettes
WO1985004080A1 (fr) 1983-01-24 1985-09-26 Cohn Charles C Traitement de papier a cigarettes
US20050172977A1 (en) 2004-02-10 2005-08-11 Paul Jadot Low ignition propensity (lip) paper smoking articles
WO2006029723A1 (fr) 2004-09-16 2006-03-23 Imperial Tobacco Ltd. Procede permettant d'imprimer des enveloppes d'articles a fumer
EP2071965A1 (fr) 2007-12-20 2009-06-24 Reemtsma Cigarettenfabriken GmbH Article à fumer avec des caractéristiques d'extinction améliorées
US20110108042A1 (en) * 2009-11-10 2011-05-12 Philip Morris Usa Inc. Registered banded cigarette paper, cigarettes, and method of manufacture
US20130087161A1 (en) * 2011-05-16 2013-04-11 Altria Client Services Inc. Alternating patterns in cigarette wrapper, smoking article and method
WO2014058102A1 (fr) * 2012-10-09 2014-04-17 Kt & G Corporation Papier à cigarette à faible propension à l'inflammation et cigarette comprenant ledit papier

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1555320A (en) 1923-04-11 1925-09-29 Weil Emile Cigarette
US1996002A (en) 1933-05-25 1935-03-26 Seaman Stewart Elmer Decreasing inflammability of cigarettes
WO1985004080A1 (fr) 1983-01-24 1985-09-26 Cohn Charles C Traitement de papier a cigarettes
US20050172977A1 (en) 2004-02-10 2005-08-11 Paul Jadot Low ignition propensity (lip) paper smoking articles
WO2006029723A1 (fr) 2004-09-16 2006-03-23 Imperial Tobacco Ltd. Procede permettant d'imprimer des enveloppes d'articles a fumer
EP2071965A1 (fr) 2007-12-20 2009-06-24 Reemtsma Cigarettenfabriken GmbH Article à fumer avec des caractéristiques d'extinction améliorées
US20110108042A1 (en) * 2009-11-10 2011-05-12 Philip Morris Usa Inc. Registered banded cigarette paper, cigarettes, and method of manufacture
WO2011057743A2 (fr) 2009-11-10 2011-05-19 Philip Morris Products S.A. Papier à cigarette conditionné sous bandes et aligné, cigarettes et procédé de fabrication
US20130087161A1 (en) * 2011-05-16 2013-04-11 Altria Client Services Inc. Alternating patterns in cigarette wrapper, smoking article and method
WO2014058102A1 (fr) * 2012-10-09 2014-04-17 Kt & G Corporation Papier à cigarette à faible propension à l'inflammation et cigarette comprenant ledit papier

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"Determination of diffusion capacity by measurement of CO2 transfer rate through materials used as cigarette papers and cigarette papers having an oriented zone of reduced diffusion capacity", CORESTA RECOMMENDED METHOD NO. 77, May 2013 (2013-05-01)

Also Published As

Publication number Publication date
EP2898784B1 (fr) 2018-05-30
PL2898784T3 (pl) 2018-11-30
ES2683321T3 (es) 2018-09-26
EP2898784A1 (fr) 2015-07-29

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