EP2661184B1 - Smoking article - Google Patents

Smoking article Download PDF

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Publication number
EP2661184B1
EP2661184B1 EP12701077.5A EP12701077A EP2661184B1 EP 2661184 B1 EP2661184 B1 EP 2661184B1 EP 12701077 A EP12701077 A EP 12701077A EP 2661184 B1 EP2661184 B1 EP 2661184B1
Authority
EP
European Patent Office
Prior art keywords
smoking article
wrapper
cigarette
rod
permeability
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.)
Active
Application number
EP12701077.5A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2661184A1 (en
Inventor
Santiago MORALES
Paulo Augusto OLIVEIRA
Edward Dennis John
Gordon Grierson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
British American Tobacco Investments Ltd
Original Assignee
British American Tobacco Investments Ltd
British American Tobacco Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by British American Tobacco Investments Ltd, British American Tobacco Co Ltd filed Critical British American Tobacco Investments Ltd
Priority to PL12701077T priority Critical patent/PL2661184T3/pl
Publication of EP2661184A1 publication Critical patent/EP2661184A1/en
Application granted granted Critical
Publication of EP2661184B1 publication Critical patent/EP2661184B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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

Definitions

  • the invention relates to a low ignition propensity smoking article comprising a wrapped rod of smokeable material.
  • smoking article includes smokeable products such as cigarettes, cigars and cigarillos whether based on tobacco, tobacco derivatives, expanded tobacco, reconstituted tobacco or tobacco substitutes and also heat-not-burn products.
  • Low ignition propensity (LIP) cigarettes have previously been manufactured by providing circumferential bands of burn suppressant in specifically developed cigarette papers.
  • the bands of burn suppressant are designed to inhibit the burn rate of the tobacco rod and to cause the cigarette to self-extinguish unless a smoker regularly draws on the filter.
  • ASTM E2187-04 specifies a standardized test against which the ignition propensity properties of smoking articles can be assessed. National regulation often requires that low ignition propensity smoking articles comply with specific requirements when tested in accordance with ASTM E2187-04. For example, when tested in accordance with ASTM E2187-04, national regulation may require that at least 75% of a test sample of forty LIP smoking articles self-extinguish before burning to the end of the tobacco rod.
  • the manufacture of cigarette papers incorporating bands of burn suppressant has involved applying the bands of burn suppressant to a pre-formed base paper to create the LIP cigarette paper.
  • the burn suppressant application process generally takes place separately from cigarette assembly and requires specialised equipment for applying the burn suppressant to the base paper.
  • the use of a burn suppressant also adds expense to the overall cigarette production process.
  • United States patent number 5,129,408 discloses a cigarette in which smokeable filler material is wrapped or contained in a processed tobacco sheet. The smokeable material wrapped in the processed tobacco sheet is in turn wrapped in a single layer of circumscribing outer wrapper material.
  • a low ignition propensity smoking article comprising a rod of smokeable material, an inner wrapper comprising reconstituted tobacco material wrapped around the smokeable material and an outer wrapper wrapped around the smokeable material and the inner wrapper.
  • the inner and outer wrappers may not comprise bands of burn suppressant material.
  • the circumference of the smoking article may be between 15mm and 22mm.
  • the circumference of the smoking article may be between 15mm and 19mm.
  • the circumference of the smoking article may be between 15mm and 17mm.
  • the circumference of the smoking article may be between 16.9mm and 17.0mm.
  • the circumference of the smoking article may be between 20.5mm and 21.5mm.
  • the length of the smoking article may be between 80mm and 120mm.
  • the length of the smoking article may be between 82mm and 84mm.
  • the permeability of the inner wrapper may be 40 CU or less.
  • the permeability of the inner wrapper may be 25 CU or less.
  • the permeability of the inner wrapper may be 15 CU or less.
  • the permeability of the inner wrapper may be 10 CU or less.
  • the permeability of the outer wrapper may be between 25 and 100 CU.
  • the permeability of the outer wrapper may be between 70 and 100 CU.
  • the inner wrapper may be reconstituted tobacco material, such as reconstituted tobacco sheet.
  • the outer wrapper may be a low sidestream cigarette paper.
  • the smoking article may be a cigarette comprising a filter, a smokeable material rod and a tipping paper overlapping the filter and the rod to axially join the rod and the filter together.
  • a method of forming a low ignition propensity smoking article comprising wrapping an inner wrapper comprising reconstituted tobacco material around a rod of smokeable material and wrapping an outer wrapper around the rod of smokeable material and the inner wrapper.
  • LIP low ignition propensity
  • the smoking article 1 shown in Figure 1 comprises an LIP cigarette 1 having a filter 2 and a rod 3 of smokeable material such as tobacco.
  • the smoking article 1 may however comprise another type of smoking article such as one of those referred to above.
  • the filter 2 and the rod 3 are coaxially joined together by a sheet of overlapping tipping paper 4, which is secured around the external surfaces of the rod 3 and the filter 2 in a conventional manner in order to secure the two together.
  • the dotted line in Figure 1 indicates the location of the abutting end faces of the filter 2 and the rod 3, overlapped by the tipping paper 4.
  • a plurality of the smoking articles 1, for example forty are tested in accordance with ASTM E2187-04, 75% or more of the plurality of smoking articles 1 self-extinguish before the burning end of the smokeable material rod 3 reaches the tipping paper 4. Therefore, 25% or less of the plurality of smoking articles burn the full length of the smokeable material rod.
  • the filter 2 may be substantially cylindrical in shape with a conventional construction.
  • a substantially cylindrical plug of filter material comprising cellulose acetate tow may be wrapped in a sheet of plug wrap around its circumferential surface.
  • Any type of filter 2 could be used, including for example more complex filters 2 comprising carbon and/or one or more flavourant materials for flavouring a gaseous flow inside the filter 2.
  • the filter 2 may be vented by vent channels formed using laser or electrostatic perforation techniques. The vent channels may provide an overall vent percentage of between 20% and 80%, preferably between 50% and 70%.
  • the rod 3 may also be substantially cylindrical in shape, with an external diameter substantially equal to the external diameter of the filter 2.
  • the rod 3 comprises a substantially cylindrical core of packed tobacco material 7 wrapped in a first wrapper 8 and a second wrapper 9.
  • the tobacco material 7 may comprise a blend of shredded tobacco, and may also include reconstituted tobacco material.
  • the first wrapper 8 is positioned inwardly of the second wrapper 9 and as such is closer to the core of tobacco material 7.
  • the first wrapper 8 will therefore be referred to herein as the inner wrapper 8.
  • the second wrapper 9 is positioned outwardly of the first wrapper 8 and will be referred to herein as the outer wrapper 9.
  • the outer wrapper 9 may form the external surface of the rod 3, with the inner wrapper 8 positioned between the outer surface of the core of tobacco material 7 and the inner surface of the outer wrapper 9.
  • the inner wrapper 8 is a sheet wrapping material comprising reconstituted tobacco material, and may be configured to impart desirable and varied flavour and sensing characteristics to the smoking article.
  • the inner wrapper 8 may comprise or consist of reconstituted tobacco sheet, which may in turn comprise or consist of one or more types of reconstituted tobacco material.
  • the reconstituted sheet can comprise a range of different tobacco types selected to improve the transmission of tobacco tastes and flavours to a smoker of the cigarette.
  • the reconstituted material can comprise one or more of sun-cured tobacco, dark air-cured tobacco, fire-cured tobacco or any other suitable tobacco type.
  • the permeability of the inner wrapper 8 may be in a range between 5 Coresta (CU) and 50 Coresta, preferably between 17 Coresta and 38 Coresta.
  • the one-ply thickness of the inner wrapper 8 may be any value in a range of between approximately 85 microns and approximately 121 microns.
  • the dry basis weight of the inner wrapper 8 may be any value between approximately 35 g/m 2 and approximately 45 g/m 2 .
  • the diffusivity of the inner wrapper 8 may be any value between approximately 0.8 cm/s and approximately 2.8 cm/s.
  • Table 1 Examples of three specific inner wrappers 8 that can be used are sheets of reconstituted tobacco material.
  • Table 1 Inner Wrapper 1 2 3 Value S.D. Value S.D. Value S.D. Diffusivity (cm/s) 0.973 0.1407 1.139 0.1735 2.657 0.5575 Grammage (gsm) 43.8 0.51 43.3 0.10 42.5 0.12 Width (mm) 18.587 0.0540 18.594 0.0471 16.180 0.0354 Strain 0.89 1.11 0.83
  • the inner wrapper 8 may extend around the circumferential surface of the core of tobacco material 7.
  • the inner wrapper 8 may extend fully around the circumference of the core 7 and fully along the axial length of the rod 3.
  • the inner wrapper 8 may thereby cover substantially the whole of the circumferential surface of the core 7.
  • the inner wrapper 8 may extend partially around the circumference of the core 7 and/or partially along the length of the rod 3.
  • the inner wrapper 8 may therefore comprise a patch underneath a full length outer wrapper 9.
  • the end faces of the core 7 are left open to allow a gaseous flow to enter and exit the rod 3 at its distal and filter ends respectively.
  • the outer wrapper 9 is also a sheet wrapping material, for example comprising or consisting of a cigarette paper or low sidestream (LSS) cigarette paper.
  • the outer wrapper 9 may comprise or consist of a plurality of types of cigarette paper and/or LSS cigarette paper.
  • the dry basis weight of the outer wrapper 9 may be any value between approximately 28 g/m 2 and approximately 40 g/m 2 , with between approximately 16.0 g/m 2 and approximately 32.0 g/m 2 of fibre, between approximately 0.3 g/m 2 and approximately 2.0 g/m 2 of K 3 citrate, between 0 g/m 2 and approximately 2 g/m 2 of MgO and between approximately 4 g/m 2 and approximately 11 g/m 2 of CaCO 3 . Other ranges can be used.
  • the amount of total filler in the outer wrapper 9 may be any value between approximately 6 g/m 2 and 10 g/m 2 , which is a total filler percentage by weight of between approximately 15% and 40%. Other ranges can be used.
  • the permeability of the outer wrapper 9 may be any value between approximately 25 Coresta and approximately 100 Coresta. Within this range, the permeability of a cigarette paper may be approximately 25 Coresta, whilst the permeability of a LSS cigarette paper may be between approximately 70 Coresta and approximately 100 Coresta.
  • the diffusivity of the outer wrapper 9 may be any value between approximately 0.30 cm/s and approximately 0.50 cm/s.
  • Example 1 is a cigarette paper, whilst examples LSS 1 and LSS 2 are low sidestream cigarette papers.
  • LSS 1 is ventilated by electroperforation (EP) and has a permeability of 70 Coresta units.
  • LSS 2 is also ventilated by electroperforation and has a permeability of 100 Coresta units.
  • the outer wrapper 9 may extend around the outer circumferential surface of the inner wrapper 8.
  • the outer wrapper 9 may extend fully around the outer circumference of the inner wrapper 8 and fully along the axial length of the rod 3, thereby covering substantially the whole of the outer circumferential surface of the inner wrapper 8.
  • the outer wrapper 9 encloses both the inner wrapper 8 and the core of tobacco material 7.
  • the end faces of the rod 3 are left open to allow a gaseous flow to pass axially through the rod 3.
  • the outer surface of the outer wrapper 9 forms the outer surface of the rod 3 to which the tipping paper 4 is adhered at the filter end.
  • the cigarette 1 can have an external circumference of approximately 16.96mm and an overall length (pre-smoking) of approximately 83mm.
  • the length of the rod 3 (pre-smoking) can be approximately 56mm and the length of the filter 2 can be approximately 27mm.
  • the external circumference of the cigarette 1 may be any value between 15mm and 22mm, whilst the overall length of the cigarette 1 may be any value between 80mm and 120mm.
  • the external circumference may, for example be approximately 21mm.
  • the overall length of the cigarette 1 can be varied by increasing/decreasing the length of either or both of the rod 3 and the filter 2.
  • the cigarette 1 does not comprise a specifically developed LIP cigarette paper having bands of burn suppressant designed to limit the burn rate of the rod 3. Manufacture of the cigarette 1 therefore does not require the pre-production of a specifically developed banded LIP cigarette paper, and accordingly does not require the specialised equipment necessary for applying burn suppressant to cigarette paper.
  • Ignition propensity tests carried out on samples of forty cigarettes 1 show that significantly less than 25% of the cigarettes 1 burn down to the tipping paper 4 when tested in accordance with ASTM E2187-04.
  • Table 3 illustrates the ignition propensity of six different sample cigarettes 1 in accordance with the invention (Samples 1-6). For each sample cigarette (1-6), forty cigarettes were tested in accordance with ASTM 2187-04. The rightmost column of Table 3 indicates the percentage of cigarettes which did not self-extinguish before the burning end of the smokeable material rod 3 reached the tipping paper 4.
  • the cigarette 1 therefore has LIP properties that are comparable to cigarettes incorporating specifically developed LIP papers, but can be produced without the requirement to manufacture the LIP papers.
  • the cigarette 1 has a relatively high puff number compared to single wrapped cigarettes.
  • the cigarette 1 may have an average puff number of approximately 7.5 compared to an average puff number of approximately 6.5 for a control, single wrapped cigarette wrapped in outer wrapper #1 (see Table 2 above).
  • the diffusivity of the combination of the inner wrapper 8 and the outer wrapper 9 of the cigarette 1 is comparable to the diffusivity of specifically developed LIP cigarette papers with bands of burn suppressant.
  • the diffusivity value for the combination of inner and outer wrappers 8, 9 may be any value in a range of between 0.080 cm/s and 0.095 cm/s.
  • the cigarette 1 exhibits low sidestream smoke compared to control cigarettes manufactured with commercially available materials.
  • Table 4 illustrates sidestream smoke chemistry results for the six example cigarettes 1 listed in Table 3 (Samples 1-6). Also illustrated in Table 4 are sidestream smoke chemistry results for two control, single-wrapped cigarettes.
  • the tobacco density of all of the cigarettes in Table 4 is 263 g/cm 3 at 13.5% moisture.
  • the tobacco blend used in the tobacco rod 3 is the same for all of the cigarettes other than Control #1, in which a different blend was used.
  • the visible sidestream produced by cigarettes 1 in accordance with the invention is also reduced as compared to control cigarettes manufactured with commercially available materials.
  • the cigarettes 1 may emit approximately 40% to 60% less visible sidestream smoke than a control cigarette which is single-wrapped in outer wrapper #1 (see Table 2 above).
  • the amount of visible side stream smoke is least when the outer wrapper 9 comprises an LSS cigarette paper. Either of the LSS papers described above can be used.
  • the reduction in visible sidestream smoke can be calculated by comparing a photograph of a burning control cigarette with a corresponding photograph of a burning cigarette 1 in accordance with the invention, and counting the difference between the number of pixels in the two photographs representing sidestream smoke.
  • Table 5 illustrates the visible sidestream smoke from three examples of the cigarette 1 (Samples 4-6), together with the visible sidestream smoke from a control, single-wrapped cigarette (Control 2).
  • the sidestream smoke reductions are calculated using the photographic method explained above, with each measurement being taken at an equivalent burn length percentage of the rod 3.
  • the filter, tobacco density and tobacco blend used in the rod 3 is the same for all cigarettes listed in Table 5.
  • the tobacco density is 263 g/cm 3 at 13.5% moisture.
  • Table 5 Cigarette Inner Wrapper Outer Wrapper Pixels representing visible sidestream Reduction (%) in pixels versus Control Control 2 - 1 985,741 - Sample 4 3 1 505,735 49 Sample 5 3 LSS 1 434,001 56 Sample 6 3 LSS 2 475,311 52
  • a plug of filter material can be formed by feeding a substantially continuous flow of cellulose acetate tow into a funnel to provide a generally cylindrical body of cellulose acetate material.
  • the cellulose acetate material can be passed through a garniture that attaches the plugwrap to the filter material from a plugwrap reel.
  • the resulting wrapped filter material can subsequently be cut into individual segments for use in making the filter 2.
  • the cut length may be suitable for producing two cigarettes 1 in tandem or individual cigarettes 1, as required.
  • the cutting may be carried out as a multistage process in which lengths of filter material for use with multiple cigarettes 2 are cut initially, and are then later cut into lengths suitable for use in manufacturing cigarettes 1 in tandem or individually.
  • Assembly of the cigarette 1 can be carried out using a suitable rod maker fitted with a tipping unit.
  • the inner wrapper 8 and outer wrapper 9 can be provided as bobbins with lengths of approximately 2500m and widths of 16.2mm. Alternative widths can be 15.8mm, 18.5mm, 20.0mm or 23mm, depending on the desired cigarette circumference.
  • the wrappers 8, 9 are pulled from bobbin carriers located next to the rod maker and guided simultaneously to a garniture by a series of rollers and a paper guide for assembly of the cigarette.
  • Inner wrapper 8 from the inner wrapper bobbin is wrapped around a column of smokeable material, and concurrently wrapped with outer wrapper 9 from the outer wrapper bobbin.
  • the relative positions of the inner 8 and outer 9 wrappers can be adjusted in the rod maker in order to adjust the size of an overlap seam for each wrapper 8, 9.
  • assembly of the cigarette 1 can comprise cutting patches of the inner wrapper 8 and applying the patches 8 to an internal surface of the outer wrapper 9 in a gluing process.
  • the combination of the outer wrapper 9 and patches 8 can then be fed to a garniture for wrapping around a smokeable material column.
  • the cigarette 1 could alternatively comprise another type of smoking article such as a cigar or a cigarillo.

Landscapes

  • Cigarettes, Filters, And Manufacturing Of Filters (AREA)
EP12701077.5A 2011-01-07 2012-01-06 Smoking article Active EP2661184B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL12701077T PL2661184T3 (pl) 2011-01-07 2012-01-06 Wyrób do palenia

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB1100218.5A GB201100218D0 (en) 2011-01-07 2011-01-07 Smoking article
GBGB1114638.8A GB201114638D0 (en) 2011-01-07 2011-08-24 Smoking article
PCT/EP2012/050177 WO2012093166A1 (en) 2011-01-07 2012-01-06 Smoking article

Publications (2)

Publication Number Publication Date
EP2661184A1 EP2661184A1 (en) 2013-11-13
EP2661184B1 true EP2661184B1 (en) 2015-08-12

Family

ID=43663903

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12701077.5A Active EP2661184B1 (en) 2011-01-07 2012-01-06 Smoking article

Country Status (13)

Country Link
EP (1) EP2661184B1 (pt)
JP (2) JP2014501532A (pt)
KR (1) KR20140041420A (pt)
AR (1) AR085068A1 (pt)
BR (1) BR112013016832B1 (pt)
CA (1) CA2821655C (pt)
CL (1) CL2013001953A1 (pt)
GB (2) GB201100218D0 (pt)
PL (1) PL2661184T3 (pt)
RU (2) RU2649559C9 (pt)
UA (1) UA108417C2 (pt)
WO (1) WO2012093166A1 (pt)
ZA (1) ZA201304762B (pt)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3981262A4 (en) * 2019-06-07 2023-02-08 Japan Tobacco Inc. TOBACCO LEAF, TOBACCO PLUGS AND SMOKING ARTICLE

Families Citing this family (7)

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Publication number Priority date Publication date Assignee Title
GB2492086A (en) * 2011-06-20 2012-12-26 British American Tobacco Co Smoking article with additional tobacco patch
GB2505514A (en) * 2012-09-04 2014-03-05 British American Tobacco Co An apparatus and a method for manufacturing a smoking article
US9149068B2 (en) * 2012-10-11 2015-10-06 Schweitzer-Mauduit International, Inc. Wrapper having reduced ignition proclivity characteristics
CN106418685B (zh) * 2016-12-05 2019-09-10 湖北中烟工业有限责任公司 带阻燃功能的多层盘纸过滤嘴卷烟
PL3446573T3 (pl) * 2017-08-24 2021-05-04 Jt International S.A. Papier owijający do wyrobu do palenia
CN108634368B (zh) * 2018-07-04 2023-08-01 云南中烟工业有限责任公司 一种完全中空型加热不燃烧卷烟
GB201907802D0 (en) * 2019-05-31 2019-07-17 British American Tobacco Investments Ltd Cigarillo

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
EP3981262A4 (en) * 2019-06-07 2023-02-08 Japan Tobacco Inc. TOBACCO LEAF, TOBACCO PLUGS AND SMOKING ARTICLE

Also Published As

Publication number Publication date
RU2649559C2 (ru) 2018-04-03
BR112013016832B1 (pt) 2021-01-19
WO2012093166A1 (en) 2012-07-12
CA2821655C (en) 2018-12-04
GB201114638D0 (en) 2011-10-12
GB201100218D0 (en) 2011-02-23
RU2649559C9 (ru) 2018-09-18
RU2013136688A (ru) 2015-02-20
CL2013001953A1 (es) 2013-11-08
PL2661184T3 (pl) 2016-01-29
EP2661184A1 (en) 2013-11-13
JP2016101169A (ja) 2016-06-02
KR20140041420A (ko) 2014-04-04
AR085068A1 (es) 2013-09-11
RU2017102571A (ru) 2018-12-19
CA2821655A1 (en) 2012-07-12
ZA201304762B (en) 2021-05-26
UA108417C2 (xx) 2015-04-27
JP2014501532A (ja) 2014-01-23
BR112013016832A2 (pt) 2016-09-27

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