EP0364256A1 - Filterstrangelement für Zigaretten und Zigaretten mit solchen Filterstrangelementen - Google Patents

Filterstrangelement für Zigaretten und Zigaretten mit solchen Filterstrangelementen Download PDF

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Publication number
EP0364256A1
EP0364256A1 EP89310430A EP89310430A EP0364256A1 EP 0364256 A1 EP0364256 A1 EP 0364256A1 EP 89310430 A EP89310430 A EP 89310430A EP 89310430 A EP89310430 A EP 89310430A EP 0364256 A1 EP0364256 A1 EP 0364256A1
Authority
EP
European Patent Office
Prior art keywords
filter rod
rod element
cigarette filter
cigarette
layer
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.)
Withdrawn
Application number
EP89310430A
Other languages
English (en)
French (fr)
Inventor
Tow Pin Liew
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rothmans International Services Ltd
Rothmans International Tobacco UK Ltd
Original Assignee
Rothmans International Tobacco UK Ltd
Rothmans International Tobacco 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
Priority claimed from GB888823903A external-priority patent/GB8823903D0/en
Priority claimed from GB898901119A external-priority patent/GB8901119D0/en
Application filed by Rothmans International Tobacco UK Ltd, Rothmans International Tobacco Ltd filed Critical Rothmans International Tobacco UK Ltd
Publication of EP0364256A1 publication Critical patent/EP0364256A1/de
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • 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
    • A24D3/045—Tobacco smoke filters characterised by their shape or structure with smoke acceleration means, e.g. impact-filters

Definitions

  • This invention relates to cigarette filter rod elements and cigarettes incorporating such filter rod elements.
  • B.A.T. GB Patent 1,339,238 proposed placing a disc of a blocking plug between a tobacco rod and an ordinary cellulose acetate filter rod. This disc has an orifice for smoke to flow through.
  • the disadvantage of this design is that the pressure drop of the cigarette will increase to an unacceptable level as the orifice of the plug becomes clogged up at the later puffs.
  • G.B. Patent 2 102 271 A, G.B. Patent 2,103,065 A and G.B. Patent 2 105 566 A of Filtona (U.K.) proposed to employ two flow paths, i.e. the low pressure drop path which has low filtration efficiency and the high pressure drop path which has high filtration efficiency, for the smoke to flow in a filter rod.
  • the smoke tends to flow through the low pressure drop path.
  • the smoke then switches to flow through the high pressure drop path due to the presence of a blocking mechanism on the low pressure drop path.
  • the disadvantage of these filters is that they are very complicated and difficult to manufacture.
  • filter rod element will be used herein to define an element which may form part of a filter rod for attachment to a cigarette, or which may itself provide the whole filter rod.
  • a cigarette filter rod element can be formed comprising a cylindrical hollow tube with a disc of fibrous material placed inside it and which provides the whole filter rod. If the edge of the disc is in tight contact or sealed with the inside wall of the hollow tube, the smoke that enters one end is confined to flowing through the disc and out through the other end of the tube.
  • the disc can be made of at least one layer of micro-fine fibres of which the average diameter is in the region of 0.5 to 10 microns.
  • a filter rod element as set forth When a filter rod element as set forth is in abuttment with a tobacco rod, it forms a filter-tipped cigarette. When this filter-tipped cigarette is smoked, the smoke stream flows through the hollow tube without being filtered until it reaches the disc. When the smoke stream passes through the disc, it enters into the layer of micro-fine fibres, which can be randomly oriented or oriented in any other particular way, and a fraction of the smoke particulates will be collected by the fibres by the commonly known mechanisms such as diffusion, impaction, interception etc. That is to say, this disc has a certain level of filtration efficiency to filter out the smoke particulates.
  • the filtration efficiency can be increased greatly when the voidage between the micro-fine fibres is reduced due to the accumulation of collected smoke particulates. Consequently, the layer of micro-fine fibres will be quickly clogged up and the pressure drop acrss the disc will increase to a very high and unacceptable level.
  • one or more suitably sized apertures are provided in the disc, no matter whether the apertures are at the centre or any other particular location, the disc does not clog up and the pressure drop across the disc only increases, if at all, to a very moderate and still acceptable level.
  • the filter rod as set forth above will increase in filtration efficiency as the smoking proceeds without the usual enormous increase in the pressure drop.
  • the filtration efficiency at the last few puffs is markedly higher than during the early puffs, less 'tar' is being delivered to the smoker's mouth at that stage. A smoker will therefore experience a much more even taste as compared with the experience from a conventional filter-­tipped cigarette with a similar total 'tar' yield.
  • a cigarette filter rod element has a flow path therethrough which includes a barrier in the form of a substantially planar disc made from a layer of micro-fine fibres with a diameter of between 0.5 and 10 microns and provided with one or more flow openings in the range 0.1 mm to 3.0 mm in diameter with a combined total area of between 0.1 mm2 and 10 mm2.
  • the layer of micro-fine fibres has a packing density of 0.05 to 0.3 and the thickness of said layer is between 0.05 and 4 mm.
  • the invention also includes a cigarette incorporating a filter rod element as set forth above.
  • a cigarette filter rod 1 is formed from an element which comprises a tube 4, a barrier disc 3 provided with an aperture 2 and made from a layer of micro-­fine fibres between 0.5 to 10 microns diameter.
  • the tube 4 may be made of any convenient material such as paper or plastics material.
  • the edge of disc 3 is in close contact with the inside wall of the tube 4 so that end-to-end flow path communication through the tube has to pass through disc 3.
  • the aperture 2 can be a single aperture or up to ten apertures, between one and three apertures being preferred.
  • a single aperture maybe located conveniently at or around the centre of the disc. If multiple apertures are used, they may be spread evenly on the disc or around the centre, and each individual aperture may be different in size and shape to the others.
  • the disc may be made of a plurality of layers of fibres, at least one layer being of micro-fine fibres of 0.5-10 microns in diameter.
  • FIG 2 shows a cross-scetional view of a cigarette provided with the filter rod 1 formed from the element shown in Figure 1.
  • Wrapped tobacco rod 6 is shown abutting the filter rod 1, the two being held in place by a tipping paper 5.
  • FIG 3 shows another embodiment of the present invention in which a filter rod 11 consists of two filter rod elements, one of which is provided by an element 1 and the other by a plain element 7, abutting each other and which are held together by a plug wrap 10.
  • the plain element 7 has a filling of known filter material 9, for example cellulose acetate tow with the fibres extending predominately axially along its length, or has non-woven fibrous material such as DANAKLON ES. and is enclosed by a wrapper 8.
  • the filter rod 11 and the tobacco rod 6 abut each other and are held in place by a tipping paper 5.
  • the use of plug wrap 10 may not be necessary if the tobacco rod 6, and the two elements are all combined together at the same time in a suitably designed cigarette making machine.
  • FIG 4 is a perspective view of a commercially available laminate fabric known as EHP (also known as EVOLUTION, KIMGUARD) made by Kimberly-Clark, USA.
  • EHP also known as EVOLUTION, KIMGUARD
  • Other similar laminates which are equally suitable are SMS, BLUE DRAPE, LX43, LX293, LX274, LX275, LX276 all made by Kimberly-Clark.
  • the laminates comprise three layers.
  • Layer 15 consists of meltblown micro-fine polypropylene fibres with a fibre diameter ranging from 1 micron to 8 microns,the majority being 1 to 3 microns.
  • Layers 14 and 16 consist of coarse polypropylene fibres of around 20 microns diameter which are employed to protect the integrity of the micro-fine fibres.
  • Layers 14, 15 and 16 are point-bonded by either thermal or ultra-sonic techniques or any other suitable technique.
  • the shaded area 17 represents the locations where point-bonding takes place, and may appear as square or round dots, or any other shapes arranged in any convenient or artistic pattern.
  • One grade of EHP laminate which has been tested and proved to be effective has a total thickness of 0.5 mm, a total fabric weight of 60 g/m2 and the three layers being approximately the same thickness. Each layer has about equal fabric weight of 20 g/m2.
  • One suitable material is a non-woven fabric, for example, DANAKLON ES (Polypropylene/polyethylene bicomponent fibres, 20 decitex, made by Danaklon, Denmark) which can be used as layers 20 and 22 and EHP fabric used as layer 21.
  • DANAKLON ES Polypropylene/polyethylene bicomponent fibres, 20 decitex, made by Danaklon, Denmark
  • EHP fabric used as layer 21.
  • the combined weight of this sandwich board can be typically 2000-3000 g/m2, having a total thickness L of 10-15 mm with acceptable mechanical rigidity and strength. Thicker sandwich board can be made by an increase of the total fibre weight.
  • the layer 21 may be perforated with apertures of suitable size at pre-determined locations before it is sandwiched.
  • a rod element can then be obtained from this sandwich board 19 by punching perpendicularly through the board as shown at 23 with the necessary aperture of layer 21 situated approximately at the centre of the punched rod element.
  • a rod element 25 obtained in this way is shown in Figure 6.
  • the sandwich board 19 can be made with layer 21 unperforated, the necessary apertures on layer 21 have to be made by drilling through either layer 20, or layer 22, or both layers.
  • a laser beam, a hot needle or any other suitable techniques may be employed for this purpose.
  • the rod elements, similar to rod element 25, can then be obtained similarly by punching method described above.
  • Figure 9 shows a cross-sectional view of a rod element obtained in this way.
  • the channel 24 is made during the process of making the aperture on layer 21 by a laser beam or a hot needle and is shown to extend from layer 20, through layer 21, and penetrating into layer 22. This channel 24 will not affect the effectiveness of the
  • rod element 25 shown in Figure 6, or the rod element shown in Figure 9 has been wrapped with a suitable plug wrap, it suitably forms a filter rod, which can be employed to replace filter rod 1 in Figure 2, or Figure 3, to form a filter-tipped cigarette.
  • FIG 7 shows another embodiment of a sandwich board from which filter rod segements can be obtained.
  • layer 31 is the rigid and porous material, being sandwiched between two layers 30 of micro-fine fibres or laminate fabric such as EHP.
  • Layer 31 can be any material which is porous, rigid and strong such as the non-woven fabric made from DANAKLON ES bicomponent fibres.
  • the sandwich board 34 can be obtained in a way similar to that of sandwich board 19 and materials in layers 30 and 31 may be bonded together to form a rigid board by applying a suitable temperature and pressure, or any other suitable methods, such as chemical binding, application of adhesive, mechanical stitching etc.
  • the filter rod segments can be obtained by punching through the board perpendicularly as indicated at 33.
  • filter rod element 35 is obtained in this way and is shown in Figure 8.
  • the filter rod element 35 consists of layers 30 of micro-­fine fibres or the laminate fabric and layer 31.
  • the aperture 2 can be drilled by a conventional method such as a laser beam or a heated needle either before, during or after the filter rod segments 35 are punched out of the sandwich board 34.
  • Figure 11 is a cross-sectional view of the filter rod obtained from sandwich board 34.
  • Channels 40 are made either by a laser beam or a hot needle during the process of making aperture 2 as described above.
  • the length of the channels 40 may be minimal or may be as long as the thickness of layer 31 but will not affect the effectiveness of the filter rod.
  • Figure 10 shows how a continuous multiple filter rod is assembled so that a convenient multiple filter rod length can be cut from it.
  • a 6-up filter rod is very commonly used in many modern cigarette-making machines.
  • Length M represents the length of a single filter rod and length N represents the common 6-up filter rod.
  • the dual filter rod as indicated as length M may be conbined with tobacco rod 6 as shown in Figure 12 to form a filter-tipped cigarette.
  • the tobacco rod 6 can be in abuttment either with the end containing material 31 or material 9 with the same effect.
  • FIG 13 shows another embodiment of a filter rod element according to the present invention.
  • DISC 3 is made of micro-fine fibres or a laminate fabric which contains at least one layer of micro-fine fibres and has an uneven surface.
  • Tip ventilation holes as indicated by reference numeral 45 in Figures 2, 3 and 12 may be provided to form either a tip-ventilated filter rod, or a tip-ventilated filter-­tipped cigarette.

Landscapes

  • Cigarettes, Filters, And Manufacturing Of Filters (AREA)
EP89310430A 1988-10-12 1989-10-11 Filterstrangelement für Zigaretten und Zigaretten mit solchen Filterstrangelementen Withdrawn EP0364256A1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB8823903 1988-10-12
GB888823903A GB8823903D0 (en) 1988-10-12 1988-10-12 Cigarette filter rod elements & cigarettes incorporating such filter rod elements
GB898901119A GB8901119D0 (en) 1989-01-19 1989-01-19 Cigarette filter rod elements and cigarettes incorporating such filter rod elements
GB8901119 1989-09-22

Publications (1)

Publication Number Publication Date
EP0364256A1 true EP0364256A1 (de) 1990-04-18

Family

ID=26294507

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89310430A Withdrawn EP0364256A1 (de) 1988-10-12 1989-10-11 Filterstrangelement für Zigaretten und Zigaretten mit solchen Filterstrangelementen

Country Status (5)

Country Link
EP (1) EP0364256A1 (de)
JP (1) JPH02200174A (de)
AU (1) AU4286489A (de)
CA (1) CA2000427A1 (de)
DK (1) DK499289A (de)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0408354A2 (de) * 1989-07-14 1991-01-16 Rothmans International Services Limited Zigaretten
WO2008110929A2 (en) * 2007-03-09 2008-09-18 Philip Morris Products S.A. Smoking article with open ended filter and restrictor
WO2008110934A2 (en) * 2007-03-09 2008-09-18 Philip Morris Products S.A. Smoking article filter with annular restrictor and downstream ventilation
WO2008110931A2 (en) * 2007-03-09 2008-09-18 Philip Morris Products S.A. Smoking articles with restrictor and aerosol former
US7878963B2 (en) 2006-03-28 2011-02-01 Philip Morris Usa Inc. Smoking article with a restrictor
US7987856B2 (en) 2005-12-29 2011-08-02 Philip Morris Usa Inc. Smoking article with bypass channel
US8235056B2 (en) 2006-12-29 2012-08-07 Philip Morris Usa Inc. Smoking article with concentric hollow core in tobacco rod and capsule containing flavorant and aerosol forming agents in the filter system
US8240315B2 (en) 2005-12-29 2012-08-14 Philip Morris Usa Inc. Smoking article with improved delivery profile
US8353298B2 (en) 2006-07-12 2013-01-15 Philip Morris Usa Inc. Smoking article with impaction filter segment
WO2013034512A1 (en) * 2011-09-09 2013-03-14 Philip Morris Products S.A. Smoking article filter with flow restriction element and cavity
US8424540B2 (en) 2009-10-09 2013-04-23 Philip Morris Usa Inc. Smoking article with valved restrictor
US8424539B2 (en) 2006-08-08 2013-04-23 Philip Morris Usa Inc. Smoking article with single piece restrictor and chamber
US8434499B2 (en) 2009-10-09 2013-05-07 Philip Morris Usa Inc. Filter design for improving sensory profile of carbon filter-tipped smoking articles
US8905037B2 (en) 2009-10-15 2014-12-09 Philip Morris Inc. Enhanced subjective activated carbon cigarette
WO2015110803A1 (en) * 2014-01-21 2015-07-30 British American Tobacco (Investments) Limited Filter materials and filters made therefrom
US9138016B2 (en) 2010-03-26 2015-09-22 Philip Morris Usa Inc. Smoking articles with significantly reduced gas vapor phase smoking constituents
EP3729978A4 (de) * 2017-12-21 2021-08-25 Antonio Francisco Marcilla Gomis Kombinierter filter zur entfernung von teeren und toxischen verbindungen aus tabakrauch
EP4032416A4 (de) * 2019-09-18 2023-11-01 Soul-Tour Electronics (Huizhou) Co., Ltd. Filterkomponente für das rauchen

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990009741A1 (en) * 1989-03-02 1990-09-07 Rothmans, Benson & Hedges Inc. Uniform tar delivery profile filter
GB9023368D0 (en) * 1990-10-26 1990-12-05 Rothmans International Ltd Smoking article
DE502004003664D1 (de) * 2003-09-03 2007-06-14 Hauni Maschinenbau Ag Verfahren und Vorrichtung zur Herstellung eines Filterstrangs

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2243349A1 (de) * 1971-09-06 1973-03-22 British American Tobacco Co Verbesserungen an tabakrauchfiltern
US4059121A (en) * 1973-04-20 1977-11-22 Rothmans Of Pall Mall Canada Limited Filter for tobacco smoke
US4469112A (en) * 1980-09-08 1984-09-04 Celanese Corporation Compound filter
EP0213081A1 (de) * 1985-08-26 1987-03-04 Baumgartner Papiers S.A. Zigarettenfiltereinheit
EP0254004A2 (de) * 1986-07-22 1988-01-27 Rhone-Poulenc Rhodia Aktiengesellschaft Ventilierte Zigarette

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2243349A1 (de) * 1971-09-06 1973-03-22 British American Tobacco Co Verbesserungen an tabakrauchfiltern
US4059121A (en) * 1973-04-20 1977-11-22 Rothmans Of Pall Mall Canada Limited Filter for tobacco smoke
US4469112A (en) * 1980-09-08 1984-09-04 Celanese Corporation Compound filter
EP0213081A1 (de) * 1985-08-26 1987-03-04 Baumgartner Papiers S.A. Zigarettenfiltereinheit
EP0254004A2 (de) * 1986-07-22 1988-01-27 Rhone-Poulenc Rhodia Aktiengesellschaft Ventilierte Zigarette

Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0408354A3 (de) * 1989-07-14 1994-03-30 Rothmans International Ltd
EP0408354A2 (de) * 1989-07-14 1991-01-16 Rothmans International Services Limited Zigaretten
US8240315B2 (en) 2005-12-29 2012-08-14 Philip Morris Usa Inc. Smoking article with improved delivery profile
US7987856B2 (en) 2005-12-29 2011-08-02 Philip Morris Usa Inc. Smoking article with bypass channel
US7878963B2 (en) 2006-03-28 2011-02-01 Philip Morris Usa Inc. Smoking article with a restrictor
US9060546B2 (en) 2006-03-28 2015-06-23 Philip Morris Usa Inc. Smoking article with a restrictor
US8353298B2 (en) 2006-07-12 2013-01-15 Philip Morris Usa Inc. Smoking article with impaction filter segment
US8424539B2 (en) 2006-08-08 2013-04-23 Philip Morris Usa Inc. Smoking article with single piece restrictor and chamber
US8235056B2 (en) 2006-12-29 2012-08-07 Philip Morris Usa Inc. Smoking article with concentric hollow core in tobacco rod and capsule containing flavorant and aerosol forming agents in the filter system
AU2008224552B2 (en) * 2007-03-09 2013-10-10 Philip Morris Products S.A. Smoking articles with restrictor and aerosol former
WO2008110931A3 (en) * 2007-03-09 2008-12-24 Philip Morris Prod Smoking articles with restrictor and aerosol former
WO2008110929A3 (en) * 2007-03-09 2009-03-19 Philip Morris Prod Smoking article with open ended filter and restrictor
US8235057B2 (en) 2007-03-09 2012-08-07 Philip Morris Usa Inc. Smoking article with open ended filter and restrictor
WO2008110929A2 (en) * 2007-03-09 2008-09-18 Philip Morris Products S.A. Smoking article with open ended filter and restrictor
WO2008110931A2 (en) * 2007-03-09 2008-09-18 Philip Morris Products S.A. Smoking articles with restrictor and aerosol former
EP2537428A1 (de) * 2007-03-09 2012-12-26 Philip Morris Products S.A. Rauchartikel mit Filter mit offenem Ende und Begrenzer
AU2008224550B2 (en) * 2007-03-09 2013-07-04 Philip Morris Products S.A. Smoking article with open ended filter and restrictor
US8353302B2 (en) 2007-03-09 2013-01-15 Philip Morris Usa Inc. Smoking articles with restrictor and aerosol former
EA017643B1 (ru) * 2007-03-09 2013-02-28 Филип Моррис Продактс С.А. Курительное изделие с фильтром с открытым концом и ограничителем
WO2008110934A3 (en) * 2007-03-09 2009-04-30 Philip Morris Prod Smoking article filter with annular restrictor and downstream ventilation
CN101657114B (zh) * 2007-03-09 2013-07-31 菲利普莫里斯生产公司 带有端部敞开的过滤器和限流器的发烟制品
EA016243B1 (ru) * 2007-03-09 2012-03-30 Филип Моррис Продактс С.А. Курительные изделия с ограничителем и источником аэрозоля
US8109277B2 (en) 2007-03-09 2012-02-07 Philip Morris USA Inc, Smoking article filter with annular restrictor and downstream ventilation
WO2008110934A2 (en) * 2007-03-09 2008-09-18 Philip Morris Products S.A. Smoking article filter with annular restrictor and downstream ventilation
US8424540B2 (en) 2009-10-09 2013-04-23 Philip Morris Usa Inc. Smoking article with valved restrictor
US8434499B2 (en) 2009-10-09 2013-05-07 Philip Morris Usa Inc. Filter design for improving sensory profile of carbon filter-tipped smoking articles
US8905037B2 (en) 2009-10-15 2014-12-09 Philip Morris Inc. Enhanced subjective activated carbon cigarette
US9138016B2 (en) 2010-03-26 2015-09-22 Philip Morris Usa Inc. Smoking articles with significantly reduced gas vapor phase smoking constituents
WO2013034512A1 (en) * 2011-09-09 2013-03-14 Philip Morris Products S.A. Smoking article filter with flow restriction element and cavity
WO2015110803A1 (en) * 2014-01-21 2015-07-30 British American Tobacco (Investments) Limited Filter materials and filters made therefrom
US10798966B2 (en) 2014-01-21 2020-10-13 British American Tobacco (Investments) Limited Filter materials and filters made therefrom
KR20220035510A (ko) * 2014-01-21 2022-03-22 브리티시 아메리칸 토바코 (인베스트먼츠) 리미티드 필터 물질 및 이로부터 제조된 필터
EP3729978A4 (de) * 2017-12-21 2021-08-25 Antonio Francisco Marcilla Gomis Kombinierter filter zur entfernung von teeren und toxischen verbindungen aus tabakrauch
EP4032416A4 (de) * 2019-09-18 2023-11-01 Soul-Tour Electronics (Huizhou) Co., Ltd. Filterkomponente für das rauchen

Also Published As

Publication number Publication date
JPH02200174A (ja) 1990-08-08
DK499289D0 (da) 1989-10-10
AU4286489A (en) 1990-04-26
CA2000427A1 (en) 1990-04-12
DK499289A (da) 1990-04-13

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