WO2012013572A1 - Filtre pour article à fumer - Google Patents

Filtre pour article à fumer Download PDF

Info

Publication number
WO2012013572A1
WO2012013572A1 PCT/EP2011/062558 EP2011062558W WO2012013572A1 WO 2012013572 A1 WO2012013572 A1 WO 2012013572A1 EP 2011062558 W EP2011062558 W EP 2011062558W WO 2012013572 A1 WO2012013572 A1 WO 2012013572A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter
mouth end
opening
base
filter according
Prior art date
Application number
PCT/EP2011/062558
Other languages
English (en)
Inventor
Karl Kaljura
Original Assignee
British American Tobacco (Investments) Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by British American Tobacco (Investments) Limited filed Critical British American Tobacco (Investments) Limited
Publication of WO2012013572A1 publication Critical patent/WO2012013572A1/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • 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

Definitions

  • the invention relates to a filter for a smoking article.
  • 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.
  • Filters in smoking articles commonly include ventilation holes for introducing external air into the filter material.
  • the purpose of the ventilation may be to dilute mainstream smoke in the filter material and/ or to affect the speed and flow path of the smoke to change the filtration characteristics of the filter.
  • the ventilation holes have generally been located in a central region of the filter, for example 12mm to 15mm from the mouth end, and extend substantially
  • a smoking article filter comprising filter material into which at least one ventilation channel configured to ventilate the filter material extends at a non-perpendicular angle to an exterior longitudinal surface of the filter.
  • the filter material may be a core of filter material.
  • the ventilation channel may comprise an opening, a shaft and a base.
  • the ventilation channel may be configured to preferentially introduce external air to the filter material at the base of the channel.
  • the opening and the base may be separated by a longitudinal distance along the filter.
  • the longitudinal distance may be between 1mm and 3mm.
  • the opening may be located longitudinally closer to a mouth end of the filter than the base.
  • the base may be located longitudinally closer to a mouth end of the filter than the opening.
  • the filter may comprise an adsorbent section located longitudinally further from the mouth end of the filter than the base of the ventilation channel.
  • the filter may comprise a plurality of ventilation channels, wherein in a first ventilation channel the base is located longitudinally closer to a mouth end of the filter than the opening and in a second ventilation channel the opening is located longitudinally closer to the mouth end of the filter than the base.
  • the filter may comprise a plurality of said first ventilation channels located at a first longitudinal distance from the mouth end of the filter and a plurality of said second ventilation channels located at a second longitudinal distance from the mouth end of the filter.
  • the first and second longitudinal distances may differ by between 0.5mm and 3.0mm.
  • each ventilation channel may be located at a longitudinal distance of between 12.0mm and 15.0mm from a mouth end of the filter.
  • the non-perpendicular angle may be an angle of between 10 degrees and 80 degrees to the exterior longitudinal surface of the filter.
  • the non-perpendicular angle may be an angle of between 20 degrees and 70 degrees to the exterior longitudinal surface of the filter.
  • the non-perpendicular angle may be an angle of between 30 degrees and 60 degrees to the exterior longitudinal surface of the filter.
  • the non-perpendicular angle may be an angle of between 40 degrees and 50 degrees to the exterior longitudinal surface of the filter.
  • a smoking article comprising the filter.
  • Figure 1 is a cross sectional illustration of a filter comprising a ring of ventilation channels angled from an exterior longitudinal of the filter towards the mouth end of the filter;
  • Figure 2 is cross sectional illustration of a ventilation channel in a filter similar to those shown in Figure 1 ;
  • Figure 3 is a cross sectional illustration of a filter comprising a ring of ventilation channels angled from an exterior longitudinal surface of the filter away from the mouth end of the filter;
  • FIG 4 is perspective illustration of a smoking article in which the filter comprises a double ring of ventilation channels similar to those shown in Figure 1 and/or Figure 3.
  • a smoking article filter 1 comprises a substantially cylindrical plug of filter material 2 wrapped in a plug wrap 3 around its circumferential surface. The end faces of the plug of filter material 2 are left unwrapped.
  • the filter material 2 can comprise cellulose acetate material.
  • the filter material 2 may additionally comprise one or more of an adsorbent material such as activated carbon and a flavourant material for imparting flavour to mainstream smoke as it passes through the filter 1.
  • the filter material 2 may comprise a plurality of axially aligned sections, with each section comprising one or more of cellulose acetate, activated carbon and flavourant.
  • the activated carbon may comprise carbon granules in a filter cavity, or may comprise similar granules distributed through cellulose acetate material in a "dalmatian" style.
  • the flavourant material may be provided as a flavour capsule or flavour thread inside the filter 1, or may be applied to the surfaces of the filter material 2/plug wrap 3.
  • Other types of known filter component can also be used.
  • the smoking article filter 1 can be joined to a paper-wrapped rod of smokeable material 9 with a tipping paper 10 in a conventional manner to form a smoking article 11.
  • the filter material 2 is ventilated by a plurality of vent channels 4, which extend from an exterior surface of the filter material 2 into a main body of the filter material 2.
  • the vent channels 4 extend into the main body of the filter material 2 at a non-perpendicular angle to the exterior, circumferential surface of the filter material 2. It has been shown that auxiliary (external) air drawn into the vent channels 4 preferentially enters the filter material 2 at the deepest part of the channel 4. Therefore, the vent channels 4 provide a means of directly introducing air from the exterior into a relatively deep part of the filter material 2.
  • each vent channel 4 comprises an opening 5 at the exterior of the filter 1, a shaft 6 extending from the opening 5 into the filter material 2 and a base 7 at the bottom of the shaft 6.
  • the base 7 is the deepest point in the channel 4.
  • the opening 5 and the base 7 of each vent channel 4 are separated in a longitudinal direction of the filter 1 by a predetermined distance L, due to the angled nature of the vent channel 4.
  • the distance L is dependent on the angle of the shaft 6 with respect to the longitudinal axis of the filter 1 and on the length of the shaft 6.
  • a suitable distance L is approximately 2mm or 3mm, although the distance may be any value in the range of 0.5mm to 5.0mm.
  • the length of the shaft 6 may, for example, be any value between 1.0mm and 6.0mm.
  • the angled nature (orientation) of the vent channels 4 can be such that the base 7 of the vent channel 4 is longitudinally closer to the mouth end of the filter 1 than the opening 5. This allows air to be introduced to the filter material 2 at a location which is longitudinally closer to the mouth end of the filter 1 than the location of the opening 5 of the vent channel 4.
  • the opening 5 of the vent channel 4 can be longitudinally closer to the mouth end of the filter 1 than the base 7. This allows air to be introduced to the filter material 2 at a location which is longitudinally further from the mouth end of the filter 1 than the location of the opening 5 of the vent channel 4.
  • the plurality of vent channels 4 may be provided in a ring 8 around the
  • vent channels 4 in one ring 8 may be different (e.g. in terms of angle or shaft length) to the vent channels 4 in another ring 8.
  • the distance between rings 8 can, for example, be any value in the range of 0.5mm to 3.0mm.
  • a preferable range for the longitudinal location of the openings 5 of the vent channels 4 is between approximately 12mm and 15mm from the mouth end of the filter 1. This is because manufacturing equipment has
  • the range of 12mm to 15mm from the mouth end of the filter 1 also takes reasonable account of manufacturing tolerances (in terms of the position of the openings 5) and variability of insertion by smokers.
  • the invention is not limited to the openings 5 being a minimum of 12mm and maximum of 15mm from the mouth end of the filter 1. Other distances can be used.
  • a single ring 8 of vent channels 4 is shown, although further rings 8 may be provided further upstream (further from the mouth end) or downstream (closer to the mouth end) in the filter material 2.
  • the ring 8 is located approximately 12mm from the mouth end of the filter 1. More specifically, the opening 5 of each vent channel 4 is located approximately 12mm from the mouth end of the filter 1.
  • each vent channel 4 The longitudinal distance L between the opening 5 and the base 7 of each vent channel 4 is approximately 2mm, with the base 7 being 2mm closer to the mouth end of the filter 1 than the opening 5.
  • the vent channels 4 are therefore angled towards the mouth end of the filter 1 and introduce external air into the filter material 2 at a location downstream from the location of the openings 5. Since air drawn into a vent channel 4 from the exterior preferentially enters the filter material 2 at the deepest part of the channel 4, close to the base 7, a substantial portion of the air drawn in through the opening 5 enters the filter material 2 at a longitudinal distance of approximately 10mm from the mouth end of the filter 1 due to the 2mm longitudinal distance L between the opening 5 and the base 7 of the vent channel 4.
  • vent channel 4 therefore allows air to be introduced to the filter material 2 at a longitudinal location which is downstream from the range of preferable distances for forming the openings 5, whilst still allowing the opening 5 to be formed within the preferable range.
  • One effect of providing the base 7 of a vent channel 4 at a location closer to the mouth end of the filter 1 than the opening 5, as described above, is to increase the effective length of filter material 2 which is located upstream from the longitudinal point at which the air enters the filter 1 and therefore also to increase the smoke residence time in the upstream section of the filter material 2.
  • This can be particularly beneficial if the upstream section of filter material 2 is an activated carbon or alternative adsorbent section because a significant increase in adsorption of particulate phase smoke components can be achieved without needing to extend the overall length of the filter 1.
  • the openings 5 of a ring 8 comprising a plurality of vent channels 4 are located at a longitudinal distance of approximately 15mm from the mouth end of the filter 1.
  • the longitudinal distance L between the opening 5 and the base 7 of each vent channel 4 is approximately 2mm, with the opening 5 being 2mm closer to the mouth end of the filter 1 than the base 7.
  • the vent channels 4 are therefore angled away from the mouth end of the filter 1 and introduce external air into the filter material 2 at a location upstream from the location of the openings 5. More specifically, in this example, a substantial portion of the external air drawn into the vent channels 4 enters the filter material 2 at a longitudinal distance of
  • vent channels 4 therefore allow air to be introduced to the filter material 2 at a longitudinal location which is upstream from the range of preferable distances for forming the opening 5, whilst still allowing the opening 5 to be formed within the preferable range.
  • the effect of ventilating the filter material 2 upstream from the longitudinal location of the openings 5 is to effectively shorten the length of filter material 2 located upstream from the longitudinal location at which external air is introduced to the filter material 2. Accordingly, the residence time of the slow-flowing smoke in the upstream section of the filter material 2 is decreased. The result can be that less particulate phase smoke components are removed in the upstream section of filter material 2 than would be the case if air was introduced closer to the mouth end, especially if the upstream section comprises an adsorbent material.
  • the reduction in removal of particulate phase smoke components in the upstream section of filter material 2 can be compensated for by providing a greater number of ventilation channels 4, thereby allowing more particulate phase smoke components to vent out of the filter 1.
  • a greater number of ventilation channels 4 can also allow more gas/vapour phase smoke components such as Carbon Monoxide (CO) to vent out of the filter 1.
  • CO Carbon Monoxide
  • the angled nature of the ventilation channels 4 may also help to protect the filter 1 against breakages.
  • the ventilation channels 4 are formed in the filter 1 "on-line" using a laser during smoking article assembly, and preferably are formed in the same apparatus as is used to assemble the smoking article 11 from its various components (filter material 2, plug wrap 3, smokeable material rod 9, tipping paper 10) .
  • a suitable method for forming the smoking article 11 is described briefly below.
  • a continuous length of substantially cylindrical cellulose acetate tow material 2, or alternative filter material 2 as described above, is wrapped around its circumferential (longitudinal) surface with a sheet of paper plug wrap 3.
  • the filter material 2 is then divided into double length filter sections for forming the filter 1.
  • the ends of the double length filter sections are each joined to a paper-wrapped smokeable material rod 9 using a double length section of tipping paper 10, which
  • the resulting double length smoking article is passed under a laser suitable for forming vent channels 4 in the filter.
  • the angle of the laser beam is non- perpendicular to the longitudinal surface of the double length filter section in order to form the angled vent channels 4 described above.
  • the double length smoking article can be rotated with respect to the laser in order to form a ring 8 of vent channels around the filter 1, and can be moved longitudinally with respect to the filter 1 so that a plurality of rings 8 are formed at spaced-apart locations along the filter 1.
  • the double length filter is then separated in two at its centre point to provide a pair of ventilated smoking articles 11.

Landscapes

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

Abstract

L'invention porte sur un filtre pour article à fumer (1) comprenant un matériau de filtre (2) dans lequel au moins un canal de ventilation (4) configuré pour ventiler le matériau de filtre (2) s'étend à un angle non perpendiculaire à une surface longitudinale extérieure du filtre (1).
PCT/EP2011/062558 2010-07-29 2011-07-21 Filtre pour article à fumer WO2012013572A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1012732.2 2010-07-29
GBGB1012732.2A GB201012732D0 (en) 2010-07-29 2010-07-29 Smoking article filter

Publications (1)

Publication Number Publication Date
WO2012013572A1 true WO2012013572A1 (fr) 2012-02-02

Family

ID=42799278

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2011/062558 WO2012013572A1 (fr) 2010-07-29 2011-07-21 Filtre pour article à fumer

Country Status (3)

Country Link
AR (1) AR083639A1 (fr)
GB (1) GB201012732D0 (fr)
WO (1) WO2012013572A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITBO20130640A1 (it) * 2013-11-25 2015-05-26 Gd Spa Elemento filtrante ed articolo da fumo comprendente tale elemento filtrante.
CN110934329A (zh) * 2019-12-30 2020-03-31 安徽天翔高新特种包装材料集团有限公司 自调节恒定气流接装纸
JP2021520787A (ja) * 2018-07-04 2021-08-26 ケーティー・アンド・ジー・コーポレーション シガレット

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2958328A (en) * 1957-05-27 1960-11-01 Frank T Bartolomeo Smoking articles
US3678941A (en) * 1971-04-05 1972-07-25 Eastman Kodak Co Tobacco smoke filter element and method for making
GB2157149A (en) * 1984-03-23 1985-10-23 British American Tobacco Co Improvements relating to smoking articles
GB2161362A (en) * 1984-06-22 1986-01-15 British American Tobacco Co Improvements relating to smoking article mouthpiece elements
CH658976A5 (en) * 1983-02-11 1986-12-31 Laesser Ag Walther Mouthpiece for a cigarette
EP0228211A1 (fr) * 1985-12-10 1987-07-08 Gallaher Limited Dispositif de filtre pour une tige à fumer
US5396910A (en) * 1993-11-24 1995-03-14 R. J. Reynolds Tobacco Company Cigarette filter
WO2009144496A1 (fr) * 2008-05-30 2009-12-03 British American Tobacco (Investments) Limited Filtre pour article à fumer
WO2010076325A1 (fr) * 2008-12-31 2010-07-08 British American Tobacco (Investments) Limited Articles ventilés pour fumeurs

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2958328A (en) * 1957-05-27 1960-11-01 Frank T Bartolomeo Smoking articles
US3678941A (en) * 1971-04-05 1972-07-25 Eastman Kodak Co Tobacco smoke filter element and method for making
CH658976A5 (en) * 1983-02-11 1986-12-31 Laesser Ag Walther Mouthpiece for a cigarette
GB2157149A (en) * 1984-03-23 1985-10-23 British American Tobacco Co Improvements relating to smoking articles
GB2161362A (en) * 1984-06-22 1986-01-15 British American Tobacco Co Improvements relating to smoking article mouthpiece elements
EP0228211A1 (fr) * 1985-12-10 1987-07-08 Gallaher Limited Dispositif de filtre pour une tige à fumer
US5396910A (en) * 1993-11-24 1995-03-14 R. J. Reynolds Tobacco Company Cigarette filter
WO2009144496A1 (fr) * 2008-05-30 2009-12-03 British American Tobacco (Investments) Limited Filtre pour article à fumer
WO2010076325A1 (fr) * 2008-12-31 2010-07-08 British American Tobacco (Investments) Limited Articles ventilés pour fumeurs

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITBO20130640A1 (it) * 2013-11-25 2015-05-26 Gd Spa Elemento filtrante ed articolo da fumo comprendente tale elemento filtrante.
WO2015075649A1 (fr) * 2013-11-25 2015-05-28 G.D S.P.A. Élément de filtre et article à fumer comprenant l'élément de filtre
JP2021520787A (ja) * 2018-07-04 2021-08-26 ケーティー・アンド・ジー・コーポレーション シガレット
JP7120715B2 (ja) 2018-07-04 2022-08-17 ケーティー アンド ジー コーポレイション シガレット
CN110934329A (zh) * 2019-12-30 2020-03-31 安徽天翔高新特种包装材料集团有限公司 自调节恒定气流接装纸

Also Published As

Publication number Publication date
GB201012732D0 (en) 2010-09-15
AR083639A1 (es) 2013-03-13

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