US20050126582A2 - Filter tow - Google Patents

Filter tow Download PDF

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Publication number
US20050126582A2
US20050126582A2 US10/476,920 US47692004A US2005126582A2 US 20050126582 A2 US20050126582 A2 US 20050126582A2 US 47692004 A US47692004 A US 47692004A US 2005126582 A2 US2005126582 A2 US 2005126582A2
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US
United States
Prior art keywords
filter
filament
filaments
filter tow
dernier
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.)
Abandoned
Application number
US10/476,920
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English (en)
Other versions
US20040237982A1 (en
Inventor
Rudiger Dollhopf
Eberhard Teufel
Thomas Leutner
Dieter Kuner
Christian Vogt
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.)
Cerdia Produktions GmbH
Original Assignee
Rhodia Acetow 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 Rhodia Acetow GmbH filed Critical Rhodia Acetow GmbH
Assigned to RHODIA ACETOW GMBH reassignment RHODIA ACETOW GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KUNER, DIETER, DOLLHOPF, RUDIGER, VOGT, CHRISTIAN, TEUFEL, EBERHARD, LEUTNER, THOMAS
Publication of US20040237982A1 publication Critical patent/US20040237982A1/en
Publication of US20050126582A2 publication Critical patent/US20050126582A2/en
Abandoned 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
    • A24D3/06—Use of materials for tobacco smoke filters
    • A24D3/08—Use of materials for tobacco smoke filters of organic materials as carrier or major constituent
    • A24D3/10—Use of materials for tobacco smoke filters of organic materials as carrier or major constituent of cellulose or cellulose derivatives
    • 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
    • A24D3/06—Use of materials for tobacco smoke filters
    • A24D3/062—Use of materials for tobacco smoke filters characterised by structural features
    • A24D3/063—Use of materials for tobacco smoke filters characterised by structural features of the fibers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/2933—Coated or with bond, impregnation or core
    • Y10T428/2964—Artificial fiber or filament
    • Y10T428/2965—Cellulosic

Definitions

  • the invention relates to a filter tow used in the manufacture of cigarette filters having a comparatively low filtration performance whose draw resistance retention characteristic was selected in such a way that their use in full-flavor cigarettes with a ventilation degree of more than 25% is possible while maintaining an acceptable draw resistance in the cigarette and an acceptable filter plug weight.
  • a typical filter cigarette of the full-flavor class has the following typical characteristics (these values are approximate typical values). They serve simply as a basis for calculations for further embodiments.
  • an optimal smoke flavor means that the draw resistance of the cigarette must not fall significantly below the current value of approximately 100 mm water column.
  • Increasing the degree of ventilation will mean that maintaining the other filter parameters such as draw resistance, diameter, position of the ventilation zone, and the filter length will significantly reduce the draw resistance of the cigarette.
  • V Ventilation degree of filter (%)/100
  • the open draw resistance will then only be 88 mm water column (instead of the original 100 mm water column) for the stated sample cigarette at a ventilation degree of 35%.
  • Such a drop in the cigarette draw resistance is clearly perceivable for the smoker and it must be offset by an increase in the filter resistance (in the above example to approximately 80 mm water column) in order to maintain the consumer's smoke feel.
  • This increase in the filter draw resistance results in an unavoidable increase in the CO/tar ratio, since the tar values, but not the CO values, are influenced by the filter draw resistance (an increase in the filter draw resistance results in a decrease in the tar values).
  • the filter tow must be suitable for producing the draw resistance values that are typical today (however preferably even higher values).
  • the filtration performance of the filter made with the filter tow of the invention must, with the given filter draw resistance, be significantly lower than the current typical retention values in order to achieve the 1:1 CO/tar ratio.
  • filter calculation programs are used to estimate the extent of such changes.
  • One example of such calculation programs is Cabled (Capability Line Expert; copyright Rhodia Acetow GmbH 1998, Freiburg, Germany) from the firm of Rhodia Acetow.
  • the object of the invention is to disclose a filter tow with which it is possible to manufacture filters that have a filtration performance achieving a CO/tar ratio of 1:1.
  • the invention proposes two approaches that are basically independent of each other and whose elements can, if desired, be combined.
  • the solution of the invention relates to a filter tow of crimped, continuous cellulose acetate filaments, in which the filaments form at least two coherent fiber bundles that have the same filament dernier and have at least 600 filaments and that differ in their filament dernier from fiber bundle to fiber bundle by at least 1 dtex.
  • this solution produces outstanding results with regard to filtration performance, since it was unexpectedly found that a filter that is manufactured from such a non-homogeneously distributed mixed tow exhibits a significantly lower tar retention than does a product made of a conventional tow with a uniform filament dernier distribution or a mixed tow having a homogeneous filament distribution (see FIG. 3).
  • the second solution is accomplished by a filter tow that has a more intensive and at the same time markedly finer crimp structure than the typical products encountered today.
  • Claim 4 recites a filter tow having a crimp index of more than 40%, in which the filaments have at least 22 curls per cm filament length.
  • this filter tow fulfills the maximum requirements with regard to filter draw resistance. The values that are achieved are even exceeded if the crimp index is more than 42%, whereby the filaments preferably have more than 25 curls per cm.
  • a filter tow having a filament dernier of more than 3.33 dtex and a total dernier of less than 44,000 dtex, preferably less than 40,000 dtex is proposed.
  • the limitation on the total dernier results in an increased filter tow consumption that is still acceptable.
  • the crimp index Ix is a measure of the intensity of curling.
  • the test load is 25 N and the preload is 2.5 N.
  • the length between the jaws of the tensile test machine is 250 mm.
  • the curling index is determined in a tensile test at a constant traverse rate of 300 mm/min on a G02 test machine manufactured by Borgwaldt GmbH, Hamburg. 10 individual readings were taken per measurement. Testing is performed in a standard climate: 20.degree. C. and 60% relative humidity. (The test method for determining the crimp ratio is described in the Cable program under the "Help" button).
  • the crimp ratio values of current filter tow specifications normally lie between 25 and 35%.
  • the firm of Rhodia Acetow is the sole manufacturer that offers worldwide specifications under the designation SK in a filament dernier range of ⁇ 2.78 dtex that covers a crimp ratio range of from greater than 35% to a maximum of 38%.
  • crimp ratio is a measure of the intensity of crimping and, thus, the position of the performance curve.
  • a performance curve is understood to mean a performance range of a filter tow, which states the draw resistance range in which a filter tow can be processed with a given diameter and filter rod length under typical processing conditions. For this working range, the performance curve describes the relationship between the draw resistance and weight.
  • the relationship between the position of the performance curve and the crimp ratio is shown using the example of a filter tow of type 2.1 Y 35 HK (filament dernier: 2.33 dtex; total demier: 38,900; cross-sectional shape of the filaments: Y; crimp ratio: 32%) and a 2.1 Y 35 SK (filament dernier: 2.33 dtex; total demier: 38,900, cross-sectional shape of the filament: Y; crimp ratio: 36%) in FIG. 1.
  • the above object is accomplished by manufacturing a filter tow that has a crimp ratio of more than 40%, preferably more than 42%. This ratio is absolutely necessary in order to cover the corresponding draw resistance range.
  • the crimp ratio is affected by the frequency and the amplitude of the crimps.
  • the number of crimps provides a measure of the fineness of crimping. Currently, typical values range from 10 to max. 20 crimps per cm filament length.
  • the SK tows referred to above normally have 15-18 crimps per cm.
  • the filter tow of the invention has, in addition to an index of more than 40% in the filaments, on average more than 22 crimps per cm, preferably more than 25.
  • Such a filter tow can be processed on conventional filter rod machines into cigarette filters that have a draw resistance level comparable to filters manufactured using the currently typical specifications.
  • FIG. 2 shows the working range of a tow of type 4.5 Y 35 of the invention (filament dernier: 5.0 dtex; total demier: 38,900 dtex) in comparison with a conventional filter tow of type 3.0 Y 35 (filament dernier 3.33 dtex: total dernier: 38,900 dtex) respectively a conventional 4.5 Y 55 and a conventional 4.5 Y 35.
  • FIG. 2 clearly shows that, compared with the current situation (3.0 Y 35) significantly more material is consumed with the solution of the invention (Example 1: 4.5 Y 35) as a result of the increase of the filament dernier, but that this additional consumption ends up being significantly less than with a traditional prior-art solution (4.5 Y 55).
  • the filter tow band contains the following components that soften the acetate filaments: water, acetone, and softening components. It is known that these softening components have a lasting effect on the crimping process.
  • U.S. Pat. No. 5,225,277 describes the effect of acetone and tow band temperatures on the stability of crimping. Products having up to 19.7 crimps per cm can be manufactured using the method described therein. This document does not make any statements with regard to the crimp ratio. However, using the data stated therein (draw resistance, tow specification and machine settings) a crimp ratio that is clearly below 35% can be estimated with the help of the Cable software referred to above.
  • JP unexamined patent document 56-53223 describes the effects of steam-treating the toll band before it enters the crimping machine. Products having 16 crimps per cm are described. No information on the crimp ratio is provided. It has now been unexpectedly discovered that hyper-fine crimping can be achieved effectively and without all-too drastic damage to the filaments if the total amount of the plasticizing components exceeds a value of 25 weight % at the time the crimping process occurs. The concentrations in which the individual components are present does not matter. The total content of the individual components is determined experimentally using a gravimetric method by taking a sample at 150.degree. C. (20 min.) directly downstream from the crimping machine.
  • one of the solutions to the object of the invention relates to a filter tow that has a so-called mixed dernier.
  • DE 29 16 062 describes such a filter tow and the cigarette filters made from it.
  • the most uniform possible distribution of the filaments is provided (see column 2, lines 22 ff. in DE 29 16 062).
  • the effect of this is that the amount of material used in the filters that are to be produced is decreased with the same draw resistance, but as a consequence of the uniform distribution of the filaments the retentions in the filters increase significantly.
  • the object of the described invention is also to save material, but at the same time the retention in the filters made from the filter tow should be significantly less than that which is achieved when corresponding filters are made from a filter tow having a uniform filter dernier. This is achieved when measures are taken to ensure that in the product of the invention the filaments of the coherent fiber bundles of the same filament dernier are formed of at least 600 filaments, preferably more than 1000 filaments, that differ in their filament demier from fiber bundle to fiber bundle by at least 1 dtex, preferably by more than 1.5 dtex.
  • the filter tow contains at least two, preferably more than five areas of filament bundles having the same filament dernier.
  • the advantage of this embodiment is that the filament bundles of the same filament dernier agglomerate in the filter and thus form areas of low, respectively high, draw resistance.
  • a filter manufactured from such a mixed-dernier tow accordingly has similar properties with respect to draw resistance and retention as those described, for example, in JP2000000085 for a classical core-jacket filter.
  • a product having a crimp ratio of more than 33%, preferably more than 35%, is made.
  • a spinning solution having a concentration of 30 weight percent cellulose acetate in acetone is prepared, filtered, and then extruded through spinnerets.
  • the water content of the spinning solution is 1.5%.
  • the spinnerets are selected with regard to the number of holes, hole size, and number of spinnerets so that ultimately a tow of type 4.5 Y 55 is made.
  • the application of softening agent is set so that an oil coating of 0.5% results.
  • the tow band is crimped with a conventional stuffer box crimping machine so that after drying and packing, a filter tow having a crimp ratio of 30.5% results.
  • the total content of plasticizing components is 22.3%.
  • the tensile strength of the tow is 143 N.
  • the number of crimps is 15.8 per cm filament length.
  • the product is processed into filter rods having a length of 126 mm and a diameter of 7.8 mm on a conventional filter rod machine, model KDF2/AF2, make: Hauni, Hamburg.
  • the generation of lint during the processing of the product is insignificant and amounts to 0.5 g/ton for the estimated consumption of one ton of material.
  • the performance curve of the product shown in FIG. 2 covers a draw resistance of 310-460 mm water column.
  • a spinning solution having a concentration of 30 weight parts cellulose acetate is prepared in acetone, filtered, and then extruded through spinnerets.
  • the water content of the spinning solution is 3%.
  • the spinnerets are selected with regard to number of holes, hole size, and number of spinnerets so that ultimately a filter tow of the type 4.5 Y 35 is produced.
  • the application of softening agent is adjusted so that an oil coating of 1.3% results.
  • the resulting tow band is crimped with a conventional stuffer box crimping machine so that, after drying and packaging, a filter tow having a crimp ratio of 43.5% results.
  • the total content of plasticizing components is 29%.
  • the tensile strength of the tow is 111 N.
  • the number of crimps is 26 per cm filament length.
  • the product is processed into filter rods having a length of 126 mm and a diameter of 7.8 mm on a conventional filter rod machine, model KDF2/AF2, make: Hauni, Hamburg.
  • the generation of lint during the processing of the product is insignificant and amounts to 2.8 g/ton for the estimated consumption of one ton of material.
  • the performance curve of the product shown in FIG. 2 , covers a draw resistance range of 298-505 mm water column.
  • a spinning solution having a concentration of 30 weight parts cellulose acetate is prepared in acetone, filtered, and then extruded through spinnerets.
  • the water content of the spinning solution is 3%.
  • the spinnerets are selected with regard to number of holes, hole size, and number of spinnerets so that ultimately a filter tow of the type 4.5 Y 32 is produced.
  • the application of softening agent is adjusted so that an oil coating of 1.3% results.
  • the resulting tow band is crimped using a conventional stuffer box crimping machine so that after drying and packaging, a filter tow having a crimp ratio of 39.8% results.
  • the total content of plasticizing components is 27.5%.
  • the tensile strength of the tow is 129 N.
  • the number of crimps is 23.1 per cm filament length.
  • the product is processed into filter rods having a length of 126 mm and a diameter of 7.8 mm on a conventional filter rod machine, model KDF2/AF2, make: Hauni.
  • the generation of lint during the processing of the product is insignificant and amounts to 0.9 g/ton for the estimated consumption of one ton of material.
  • the performance curve of the product covers a draw resistance range of 267-487 mm water column.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Cigarettes, Filters, And Manufacturing Of Filters (AREA)
  • Filtering Materials (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Artificial Filaments (AREA)
US10/476,920 2001-05-02 2004-05-04 Filter tow Abandoned US20050126582A2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10121310A DE10121310A1 (de) 2001-05-02 2001-05-02 Filter Tow
DE10121310.7 2001-05-02
PCT/EP2002/004063 WO2002087366A2 (de) 2001-05-02 2002-04-11 Filter tow aus gekräuselten, endlosen celluloseacetatfilamenten

Publications (2)

Publication Number Publication Date
US20040237982A1 US20040237982A1 (en) 2004-12-02
US20050126582A2 true US20050126582A2 (en) 2005-06-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
US10/476,920 Abandoned US20050126582A2 (en) 2001-05-02 2004-05-04 Filter tow

Country Status (9)

Country Link
US (1) US20050126582A2 (de)
EP (1) EP1389922B1 (de)
KR (1) KR100579703B1 (de)
AT (1) ATE345059T1 (de)
AU (1) AU2002315288A1 (de)
CA (1) CA2445966C (de)
DE (2) DE10121310A1 (de)
MX (1) MXPA03009974A (de)
WO (1) WO2002087366A2 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040237982A1 (en) * 2001-05-02 2004-12-02 Rudiger Dollhopf Filter tow
US20120024304A1 (en) * 2010-07-30 2012-02-02 Rj Reynolds Tobacco Company Filter Element Comprising Multifunctional Fibrous Smoke-Altering Material

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* Cited by examiner, † Cited by third party
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US7534380B2 (en) 2004-06-25 2009-05-19 Celanese Acetate Llc Cellulose acetate tow and method of making same
US7585441B2 (en) 2004-06-25 2009-09-08 Celanese Acetate, Llc Process of making cellulose acetate tow
US7445737B2 (en) 2004-06-25 2008-11-04 Celanese Acetate, Llc Cellulose acetate tow and method of making same
US6924029B1 (en) 2004-06-25 2005-08-02 Celanese Acetate, Llc Cellulose acetate tow and method of making same
US7534379B2 (en) 2004-06-25 2009-05-19 Celanese Acetate Llc Process of making cellulose acetate tow
US7585442B2 (en) 2004-06-25 2009-09-08 Celanese Acetate, Llc Process for making cellulose acetate tow
US7425289B2 (en) 2004-06-25 2008-09-16 Celanese Acetate Llc Process of making cellulose acetate tow
DE102007061933A1 (de) * 2007-12-21 2009-07-02 Rhodia Acetow Gmbh Filter Tow Ballen, Vorrichtung und Verfahren zur Herstellung eines Filter Tow Ballens sowie Filter Tow Streifen
DE102010063593A1 (de) 2010-12-20 2012-06-21 Hauni Maschinenbau Ag Faservliesherstellung
TWI629007B (zh) * 2012-12-21 2018-07-11 Philip Morris Products S. A. 包含氣流導向元件的煙品
KR101455002B1 (ko) 2013-06-28 2014-11-03 코오롱인더스트리 주식회사 담배필터용 라이오셀 소재 및 그 제조방법
KR102211219B1 (ko) * 2014-06-30 2021-02-03 코오롱인더스트리 주식회사 담배필터용 이형단면 라이오셀 소재 및 그 제조방법
KR102211186B1 (ko) 2014-12-31 2021-02-03 코오롱인더스트리 주식회사 담배필터용 라이오셀 소재 및 그 제조방법
EP3643185A4 (de) * 2017-06-19 2021-05-26 Japan Tobacco, Inc. Rauchartikelfilter und herstellungsverfahren dafür
EP3662770B1 (de) 2018-10-25 2021-02-24 Daicel Corporation Towstreifen für die spitze einer elektronischen zigarette, spitze für elektronische zigarette, verfahren zur herstellung des towstreifens für die spitze einer elektronischen zigarette und verfahren zur herstellung einer spitz einer elektronischen zigarette
DE102019135114A1 (de) * 2019-12-19 2021-06-24 Cerdia International GmbH Filter- und/oder füllmaterial für mundstücke zur verwendung mit rauchwaren oder hnb-produkten, mundstücke und zigarettenfilter mit einem solchen filter- und/oder füllmaterial sowie verfahren zur herstellung eines solchen filter- und/oder füllmaterials
EP4335308A1 (de) * 2021-09-30 2024-03-13 Kolon Industries, Inc. Lyocellmaterial für zigarettenfilter und verfahren zur herstellung davon

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US2828752A (en) * 1954-08-16 1958-04-01 Eastman Kodak Co Fibrous tobacco smoke filters
US2881771A (en) * 1954-12-20 1959-04-14 Eastman Kodak Co Cigarette filters
US2966157A (en) * 1957-06-07 1960-12-27 Eastman Kodak Co Polyolefin tobacco smoke filters
US3300831A (en) * 1963-06-14 1967-01-31 British Nylon Spinners Ltd Crimping of textile fibres
US3428723A (en) * 1965-09-15 1969-02-18 Eastman Kodak Co Method of making a cigarette filter tow
US4115907A (en) * 1976-09-09 1978-09-26 Imperial Chemical Industries Limited Fiber process
US4173504A (en) * 1977-01-19 1979-11-06 Chisso Corporation Method for producing tobacco filters
US4261373A (en) * 1977-05-25 1981-04-14 The Japan Tobacco & Salt Public Corp. Tobacco filters and method for forming same
US4961415A (en) * 1987-01-16 1990-10-09 Kimberly-Clark Corporation Controlled draft and efficiency filter element for smoking articles
US5020198A (en) * 1988-08-10 1991-06-04 Filter Materials Ltd. Crimped textile fibers and stuffer box apparatus and methods for crimping textile fibers
US5063945A (en) * 1989-03-31 1991-11-12 Chisso Corporation Tobacco filter stock
US5225277A (en) * 1989-11-17 1993-07-06 Daicel Chemical Industries, Ltd. Acetate tow having high crimp modulus and manufacturing method thereof
US5677058A (en) * 1990-01-18 1997-10-14 Eastman Chemical Company Lubricant impregnated fibers and processes for preparation thereof
US5947127A (en) * 1993-07-13 1999-09-07 Daicel Chemical Industries, Ltd. Tobacco filters and method of producing the same
US5947126A (en) * 1997-05-29 1999-09-07 Eastman Chemical Co. Environmentally disintegratable tobacco smoke filter rod
US6739344B2 (en) * 1999-03-11 2004-05-25 Japan Tobacco Inc. Biodegradable cellulose acetate structure and tobacco filter
US20040237982A1 (en) * 2001-05-02 2004-12-02 Rudiger Dollhopf Filter tow

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US4034765A (en) * 1975-10-30 1977-07-12 Liggett & Myers Incorporated Tobacco smoke filter
JPS5922511B2 (ja) * 1978-04-22 1984-05-26 ダイセル化学工業株式会社 たばこ煙用フイルタ−

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US2828752A (en) * 1954-08-16 1958-04-01 Eastman Kodak Co Fibrous tobacco smoke filters
US2881771A (en) * 1954-12-20 1959-04-14 Eastman Kodak Co Cigarette filters
US2966157A (en) * 1957-06-07 1960-12-27 Eastman Kodak Co Polyolefin tobacco smoke filters
US3300831A (en) * 1963-06-14 1967-01-31 British Nylon Spinners Ltd Crimping of textile fibres
US3428723A (en) * 1965-09-15 1969-02-18 Eastman Kodak Co Method of making a cigarette filter tow
US4115907A (en) * 1976-09-09 1978-09-26 Imperial Chemical Industries Limited Fiber process
US4173504A (en) * 1977-01-19 1979-11-06 Chisso Corporation Method for producing tobacco filters
US4261373A (en) * 1977-05-25 1981-04-14 The Japan Tobacco & Salt Public Corp. Tobacco filters and method for forming same
US4961415A (en) * 1987-01-16 1990-10-09 Kimberly-Clark Corporation Controlled draft and efficiency filter element for smoking articles
US5020198A (en) * 1988-08-10 1991-06-04 Filter Materials Ltd. Crimped textile fibers and stuffer box apparatus and methods for crimping textile fibers
US5063945A (en) * 1989-03-31 1991-11-12 Chisso Corporation Tobacco filter stock
US5225277A (en) * 1989-11-17 1993-07-06 Daicel Chemical Industries, Ltd. Acetate tow having high crimp modulus and manufacturing method thereof
US5618620A (en) * 1989-11-17 1997-04-08 Daicel Chemical Industries, Ltd. Filter rod for filtering the smoke of a cigarette
US5677058A (en) * 1990-01-18 1997-10-14 Eastman Chemical Company Lubricant impregnated fibers and processes for preparation thereof
US5947127A (en) * 1993-07-13 1999-09-07 Daicel Chemical Industries, Ltd. Tobacco filters and method of producing the same
US5947126A (en) * 1997-05-29 1999-09-07 Eastman Chemical Co. Environmentally disintegratable tobacco smoke filter rod
US6739344B2 (en) * 1999-03-11 2004-05-25 Japan Tobacco Inc. Biodegradable cellulose acetate structure and tobacco filter
US20040237982A1 (en) * 2001-05-02 2004-12-02 Rudiger Dollhopf Filter tow

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040237982A1 (en) * 2001-05-02 2004-12-02 Rudiger Dollhopf Filter tow
US20120024304A1 (en) * 2010-07-30 2012-02-02 Rj Reynolds Tobacco Company Filter Element Comprising Multifunctional Fibrous Smoke-Altering Material
US8720450B2 (en) * 2010-07-30 2014-05-13 R.J. Reynolds Tobacco Company Filter element comprising multifunctional fibrous smoke-altering material
US20140210127A1 (en) * 2010-07-30 2014-07-31 R.J. Reynolds Tobacco Company Filter element comprising multifunctional fibrous smoke-altering material
US9119420B2 (en) * 2010-07-30 2015-09-01 R.J. Reynolds Tobacco Company Filter element comprising multifunctional fibrous smoke-altering material

Also Published As

Publication number Publication date
AU2002315288A1 (en) 2002-11-11
KR20040015229A (ko) 2004-02-18
WO2002087366A2 (de) 2002-11-07
US20040237982A1 (en) 2004-12-02
KR100579703B1 (ko) 2006-05-15
MXPA03009974A (es) 2004-06-30
ATE345059T1 (de) 2006-12-15
EP1389922A2 (de) 2004-02-25
CA2445966C (en) 2007-08-28
DE50208713D1 (de) 2006-12-28
EP1389922B1 (de) 2006-11-15
WO2002087366A3 (de) 2003-10-30
DE10121310A1 (de) 2002-11-28
CA2445966A1 (en) 2002-11-07

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