WO1990009741A1 - Filtre a courbe de liberation du goudron uniforme - Google Patents

Filtre a courbe de liberation du goudron uniforme Download PDF

Info

Publication number
WO1990009741A1
WO1990009741A1 PCT/CA1990/000070 CA9000070W WO9009741A1 WO 1990009741 A1 WO1990009741 A1 WO 1990009741A1 CA 9000070 W CA9000070 W CA 9000070W WO 9009741 A1 WO9009741 A1 WO 9009741A1
Authority
WO
WIPO (PCT)
Prior art keywords
smoke
cigarette
filter element
cylinder
filter
Prior art date
Application number
PCT/CA1990/000070
Other languages
English (en)
Inventor
Warren Arthur Brackmann
Original Assignee
Rothmans, Benson & Hedges Inc.
Rothmans International Services 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
Priority claimed from GB898904752A external-priority patent/GB8904752D0/en
Priority claimed from GB898909660A external-priority patent/GB8909660D0/en
Application filed by Rothmans, Benson & Hedges Inc., Rothmans International Services Limited filed Critical Rothmans, Benson & Hedges Inc.
Priority to DE69031032T priority Critical patent/DE69031032T2/de
Priority to EP90904210A priority patent/EP0461162B1/fr
Publication of WO1990009741A1 publication Critical patent/WO1990009741A1/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

Definitions

  • the present invention relates to a novel cigarette smoke filter element which is able to provide a more uniform tar delivery profile to the smoker than has heretofore been possible, and to cigarettes incorporating such filter elements.
  • the disc is of a diameter which is 5 to 25 percent less than the diameter of the filter rod and this filter, therefore, can only achieve improved filtration efficiency, with no ability to even the "tar" delivery profile.
  • B.A.T. GB Patent no. 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 increases to an unacceptable level as the orifice of the plug becomes clogged up at the later puffs.
  • U.S. Patent no. 3,882,877 proposed placing a disc of microfine fibres in between two filter rod segments. This filter is designed to increase filtration efficiency. However, it could not cause the "tar" delivery to be more even, furthermore the pressure drop may increase to an unacceptable level at the later puffs.
  • Browne et al., U.S. Patents nos. 4,460,000 and 4,469,112 proposed using a compound filter that contains a perforated barrier disc through which the whole smoke passes to a cellulose acetate filter rod segment. As the smoking process proceeds, more and more "tar” builds up on the cellulose acetate fibres around the exit of the perforations.
  • U.S. Patent no. 4,747,418 uses a filter element in the form of a membrane having a large number of tiny openings in combination with openings downstream of the membrane through which air may be drawn or conventional filter substance in an attempt to produce a more uniform tar delivery. Again a complicated and expensive structure is required.
  • an improved filter structure is provided wherein two different filter materials are combined to achieve a more uniform tar delivery.
  • a cigarette smoke filter element characterized by an outer elongate cylinder of tobacco smoke filter material, an inner elongate cylinder of microfine fibres and an axial cigarette smoke path radially inwardly of the cylinder of microfine fibres.
  • the outer cylinder of smoke filter material has a greater resistance to the flow of cigarette smoke therethrough than the axial flow path.
  • Tobacco smoke flow path directing means is located at one end of the filter element for directing cigarette smoke from a cigarette to which the filter element is attached, only into the outer cylinder of tobacco smoke filter material. In this way, cigarette smoke directed from a cigarette into the outer cylinder passes first through the outer cylinder, and then through the inner cylinder into the axial low resistance flow path.
  • the tobacco smoke is forced to flow by a progressively-increasing length of flow path through the outer cylinder as a progressively greater proportion of the length of the inner cylinder becomes clogged with tar filtered from the tobacco smoke. As explained in more detail below. this effect leads to a more uniform delivery of tar in the cigarette smoke to the smoker's mouth.
  • the cylinder of microfine fibres may be provided between two outer porous support layers.
  • the microfine 5. fibres may be formed as described in the aforementioned U.S. Patent no. 3,882,877, the disclosure of which is incorporated herein by reference.
  • the microfine fibres in the cylindrical layer thereof may have any convenient diameter to achieve the desired filtration as described 0 herein, generally from about 0.5 to about 10 microns.
  • the cylindrical layer may have any convenient thickness to achieve the desired filtration as described herein, generally from about 0.05 to about 4 mm.
  • the microfine fibres may be packed to any desired degree to achieve 5 the desired filtration, generally from about 0.05 to about 0.3 g/cc.
  • the outer annulus of filter material may comprise any of the well-known filtration materials commonly employed in cigarette filters, generally cellulose 0 acetate tow with its fibres extending predominantly axially along its length, or a non-woven fibrous material, such as DANAKLON ES (polypropylene/ polyethylene bicomponent fibres made by Danaklon, Denmark) .
  • the microfine fibres are a highly efficient cigarette smoke filtration medium and function to remove liquid components from the smoke, as described more fully in U.S. Patent no. 3,882,877. The filtration is so efficient that the filter can rapidly become blocked 0 and permits no further smoke filtration to occur.
  • the result 0 of this filtration operation is that the smoke entering the smoker's mouth has a substantially uniform tar content and the problem of increasing tar yield from the cigarette is compensated for by providing progressively increased filtration of the tobacco smoke before it 5 reaches the smoker's mouth, without introducing an unacceptable level of pressure drop.
  • a method of achieving a more uniform delivery of tar in tobacco smoke entering a 0 smoker's mouth from a cigarette characterized by causing the tobacco smoke to pass from a burning cigarette first into an outer cylinder of tobacco smoke filter material of higher resistance to smoke flow, and then through an inner cylinder of microfine fibres into 5 an axial flow path to the smoker's mouth of lower resistance to smoke flow, filtering filterable materials, including tar, from the smoke both in the outer cylinder and the inner cylinder, and causing said smoke to pass through a progressively longer flow path through said outer cylinder as a progressively increased 5.
  • proportion of the inner cylinder becomes incapable of effecting filtration, thereby to remove progressively greater proportion of filterable materials, including tar, from the tobacco smoke.
  • Figure 1 is a schematic sectional view of a novel cigarette filter constructed in accordance with one embodiment of the invention.
  • a cylindrical cigarette 10 includes a cigarette rod 12 and a novel filter 14, having a construction which the applicants regard as the current best mode of carrying out the invention.
  • the 0 cigarette rod 12 has a conventional paper wrapper 16 and is joined to the filter 14 by a conventional cork wrap 18.
  • the filter 14 comprises an outer annulus 20 of conventional cellulose acetate tow material having an 5 outer wrap 22.
  • a cylinder of microfine fibres 24 abuts the inner radial extremity of the annulus 20 and typically is supported between outer layers of low flow resistance fabric.
  • the cylinder 24 is sandwiched between the annulus 0 20 and an inner plug 26 of low flow resistance material, such as low flow resistance acetate.
  • the inner plug 26 may be omitted entirely, if desired, but preferably is employed to provide mechanical strength and stability to the structure.
  • Alternative support structures may be 5 employed, such as an extruded plastic core with a star- shaped cross-section or other convenient shape providing smoke flow channels radially inwardly of the cylinder 24.
  • the filter is sealed against the flow of cigarette smoke directly from the cigarette rod 16 to the acetate plug 26, such as by crimping 32 the acetate plug 26, and/or by providing a circular baffle 34 overlying the end of the acetate plug 26.
  • the smoke follows the path of least resistance so that, initially, the smoke flows only for a short distance through the annulus material 20 before flowing through the microfine fibres into the acetate plug 26.
  • microfine fibres effect efficient filtration of the tobacco smoke to remove smoke-borne particulates including tar-containing droplets and the fibres eventually are unable to effect further filtration. Accordingly, the microfine fibres in the cylinder 24 become, in the direction towards the smoking end of the cigarette 10, progressively unable to effect filtration.
  • the cigarette smoke therefore, is required to transverse a progressively longer path through the annulus filtration material 20 before the smoke can travel radially inwardly into the acetate plug 26.
  • a progressively greater degree of filtration is effected by the annulus material 20 and, thereby, a progressively greater degree of overall filtration is effected as the cigarette 10 is smoked, thereby compensating for the progressively greater tar production by the cigarette rod 12.
  • smoke can pass from the annulus material 20 directly into the smoker's mouth.
  • the predominant smoke flow path is via the acetate plug 26 because of its lower resistance to smoke flow.
  • an annular barrier may be provided overlying the smoking end of the annulus material 20 to force all the smoke to flow to the smoker's mouth through the acetate plug 26.
  • the filter element 10 may be formed in any convenient manner.
  • the acetate plug 26 is replaced by an extruded plastic core having a star-shaped cross section so as to provide a plurality of channels through which the filtered smoke can pass to the smoker.
  • the plastic core then is reciprocated in front of a fine fibre extruder on a continuous basis.
  • the plastic core is rotated about its axis, so that the fibers are collected in an uniform layer 24 on the periphery of the core i.e., at the radial extremities of the points of the star.
  • the relatively few microfine fibers which may randomly extend into the air passages between the points of the star-shaped cross section are not sufficient to affect significantly the low pressure drop ducts between the legs of the star.
  • the continuous rod then is passed through a filter- making machine, wherein the core is periodically crimped and the normal high efficiency filter material 20 is placed on the outside of the layer 24 of microfine fibres.
  • the filter then is wrapped in conventional plug wrap 22 and cut at the crimped points to provide a plurality of filter elements 14.
  • the present invention provides a novel cigarette filter structure to provide a uniform delivery of tar to a smoker by providing for successively greater degrees of filtration as the cigarette is smoked, without producing unacceptable levels of pressure drop.
  • Cigarettes are a staple item of commerce. Modifications are possible within the scope of this invention.

Landscapes

  • Cigarettes, Filters, And Manufacturing Of Filters (AREA)
  • Fats And Perfumes (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Abstract

La présente invention se rapporte à un filtre (14) pour la fumée du tabac, qui produit une courbe de libération du goudron plus uniforme sans chute de pression inacceptable en amenant la fumée de la cigarette à suivre un trajet d'écoulement progressivement plus long à travers un cylindre externe (20) en matériau d'étoupe de filtre à résistance élevée à l'écoulement, avant de passer radialement vers intérieur à travers un cylindre (24) en fibres microfines en suivant un trajet d'écoulement à faible résistance (26) jusque dans la bouche du fumeur. L'augmentation progressive du trajet d'écoulement a pour résultat un engorgement progressif du cylindre en fibres microfines par le matériau filtré au fur à mesure que la cigarette est fumée.
PCT/CA1990/000070 1989-03-02 1990-03-01 Filtre a courbe de liberation du goudron uniforme WO1990009741A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE69031032T DE69031032T2 (de) 1989-03-02 1990-03-01 Filter mit einer gleichmässigen abgabe von teer
EP90904210A EP0461162B1 (fr) 1989-03-02 1990-03-01 Filtre a courbe de liberation du goudron uniforme

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB898904752A GB8904752D0 (en) 1989-03-02 1989-03-02 Uniform tar delivery profile filter
GB8904752.6 1989-03-02
GB898909660A GB8909660D0 (en) 1989-04-27 1989-04-27 Uniform tar delivery profile filter-11
GB8909660.6 1989-04-27

Publications (1)

Publication Number Publication Date
WO1990009741A1 true WO1990009741A1 (fr) 1990-09-07

Family

ID=26295035

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA1990/000070 WO1990009741A1 (fr) 1989-03-02 1990-03-01 Filtre a courbe de liberation du goudron uniforme

Country Status (6)

Country Link
EP (1) EP0461162B1 (fr)
JP (1) JP2701974B2 (fr)
AU (1) AU629320B2 (fr)
CA (1) CA2049573C (fr)
DE (1) DE69031032T2 (fr)
WO (1) WO1990009741A1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993002575A1 (fr) * 1991-08-08 1993-02-18 Rothmans, Benson & Hedges Inc. Regulation de la chimie de la fumee des cigarettes
EP0540361A1 (fr) * 1991-10-30 1993-05-05 Rothmans, Benson & Hedges Inc. Nouveau système de cigarette pour fumer en plusieurs fois
WO1994023599A1 (fr) * 1993-04-14 1994-10-27 1149235 Ontario Inc. Systeme de filtre de fumee de cigarettes
US5365951A (en) * 1990-08-24 1994-11-22 Philip Morris Incorporated Concentric smoking filter having cellulose acetate tow periphery and carbon-particle-loaded web filter core
TR26626A (tr) * 1992-12-18 1995-03-15 Rothmans Benson And Hedges Inc Yeni cok icimli sigara sistemi.
US5462801A (en) * 1993-07-09 1995-10-31 Rhone-Poulenc Rhodia Aktiengesellschaft Filter Tow, method for the production thereof, as well as tobacco smoke filter element and method for its production
TR28750A (tr) * 1992-12-18 1997-02-28 Rothmans Benson & Hedges Münferit sigaralarin, kismen icilmesi, söndürülmesi ve ondan sonra tekrar icilmesine, müsaade eden yeni bir sigara strüktürü.
US5746230A (en) * 1990-08-24 1998-05-05 Philip Morris Incorporated Concentric smoking filter having discrete tow and web filter media
AU699329B2 (en) * 1991-08-08 1998-12-03 Rothmans International Services Limited Control of cigarette smoke chemistry
WO2007096710A2 (fr) * 2005-12-29 2007-08-30 Philip Morris Products S.A. Article pour fumeur avec canal de derivation
US8550092B2 (en) 2007-07-17 2013-10-08 British American Tobacco (Investments) Limited Filter

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8823902D0 (en) * 1988-10-12 1988-11-16 Rothmans Int Tobacco Cigarette filter rod elements & cigarettes incorporating such filter rod elements

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH455609A (fr) * 1965-05-27 1968-07-15 Monsanto Co Cigarette à bout filtre
US3502087A (en) * 1968-07-05 1970-03-24 Ernest J Romano Cigarette filter
US3621851A (en) * 1969-11-26 1971-11-23 Kata Mfg & Filtering Co Filter for smoker's article
GB1360611A (en) * 1971-06-30 1974-07-17 Molins Ltd Cigarette filters
US3854384A (en) * 1971-05-24 1974-12-17 Brown & Williamson Tobacco Method of making tobacco smoke filters
EP0254004A2 (fr) * 1986-07-22 1988-01-27 Rhone-Poulenc Rhodia Aktiengesellschaft Cigarette aérée
EP0364253A1 (fr) * 1988-10-12 1990-04-18 Rothmans International Services Limited Elément de tiges de filtre à cigarette et cigarettes avec de tels éléments de tiges de filtre

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK499289A (da) * 1988-10-12 1990-04-13 Rothmans Int Tobacco Stangelementer til cigaretfiltre og cigaretter udstyret med saadanne stangelementer

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH455609A (fr) * 1965-05-27 1968-07-15 Monsanto Co Cigarette à bout filtre
US3502087A (en) * 1968-07-05 1970-03-24 Ernest J Romano Cigarette filter
US3621851A (en) * 1969-11-26 1971-11-23 Kata Mfg & Filtering Co Filter for smoker's article
US3854384A (en) * 1971-05-24 1974-12-17 Brown & Williamson Tobacco Method of making tobacco smoke filters
GB1360611A (en) * 1971-06-30 1974-07-17 Molins Ltd Cigarette filters
EP0254004A2 (fr) * 1986-07-22 1988-01-27 Rhone-Poulenc Rhodia Aktiengesellschaft Cigarette aérée
EP0364253A1 (fr) * 1988-10-12 1990-04-18 Rothmans International Services Limited Elément de tiges de filtre à cigarette et cigarettes avec de tels éléments de tiges de filtre

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5746230A (en) * 1990-08-24 1998-05-05 Philip Morris Incorporated Concentric smoking filter having discrete tow and web filter media
US5365951A (en) * 1990-08-24 1994-11-22 Philip Morris Incorporated Concentric smoking filter having cellulose acetate tow periphery and carbon-particle-loaded web filter core
WO1993002575A1 (fr) * 1991-08-08 1993-02-18 Rothmans, Benson & Hedges Inc. Regulation de la chimie de la fumee des cigarettes
AU699329B2 (en) * 1991-08-08 1998-12-03 Rothmans International Services Limited Control of cigarette smoke chemistry
EP0540361A1 (fr) * 1991-10-30 1993-05-05 Rothmans, Benson & Hedges Inc. Nouveau système de cigarette pour fumer en plusieurs fois
EP0540362A1 (fr) * 1991-10-30 1993-05-05 Rothmans, Benson & Hedges Inc. Nouveau système de cigarette
WO1993008706A1 (fr) * 1991-10-30 1993-05-13 Rothmans, Benson & Hedges Inc. Nouvelle cigarette
WO1993008708A1 (fr) * 1991-10-30 1993-05-13 Rothmans, Benson & Hedges Inc. Nouvelle cigarette pouvant etre fumee plusieurs fois
TR26626A (tr) * 1992-12-18 1995-03-15 Rothmans Benson And Hedges Inc Yeni cok icimli sigara sistemi.
TR28750A (tr) * 1992-12-18 1997-02-28 Rothmans Benson & Hedges Münferit sigaralarin, kismen icilmesi, söndürülmesi ve ondan sonra tekrar icilmesine, müsaade eden yeni bir sigara strüktürü.
US5495859A (en) * 1993-04-14 1996-03-05 1149235 Ontario Inc. Cigarette smoke filter system
US5497791A (en) * 1993-04-14 1996-03-12 114935 Ontario Inc. Smoker's accessory
US5638833A (en) * 1993-04-14 1997-06-17 1149235 Ontario Inc. Cigarette smoke filter system
WO1994023600A1 (fr) * 1993-04-14 1994-10-27 1149235 Ontario Inc. Accessoire pour fumeur
US5752527A (en) * 1993-04-14 1998-05-19 Ontario Inc. Smoker's accessory
WO1994023599A1 (fr) * 1993-04-14 1994-10-27 1149235 Ontario Inc. Systeme de filtre de fumee de cigarettes
US5462801A (en) * 1993-07-09 1995-10-31 Rhone-Poulenc Rhodia Aktiengesellschaft Filter Tow, method for the production thereof, as well as tobacco smoke filter element and method for its production
WO2007096710A2 (fr) * 2005-12-29 2007-08-30 Philip Morris Products S.A. Article pour fumeur avec canal de derivation
WO2007096710A3 (fr) * 2005-12-29 2007-12-27 Philip Morris Prod Article pour fumeur avec canal de derivation
US8550092B2 (en) 2007-07-17 2013-10-08 British American Tobacco (Investments) Limited Filter
US9078471B2 (en) 2007-07-17 2015-07-14 British American Tobacco (Investments) Limited Filter
US10334875B2 (en) 2007-07-17 2019-07-02 British American Tobacco (Investments) Limited Filter

Also Published As

Publication number Publication date
DE69031032T2 (de) 1998-01-29
AU629320B2 (en) 1992-10-01
DE69031032D1 (de) 1997-08-14
CA2049573A1 (fr) 1991-09-02
AU5268990A (en) 1990-09-26
CA2049573C (fr) 1997-01-14
JP2701974B2 (ja) 1998-01-21
EP0461162B1 (fr) 1997-07-09
JPH04503753A (ja) 1992-07-09
EP0461162A1 (fr) 1991-12-18

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