EP0474940A1 - Konzentrischer Rauchfilter mit Filtriermedien aus Fadenmaterial und Bahnmaterial - Google Patents
Konzentrischer Rauchfilter mit Filtriermedien aus Fadenmaterial und Bahnmaterial Download PDFInfo
- Publication number
- EP0474940A1 EP0474940A1 EP90313555A EP90313555A EP0474940A1 EP 0474940 A1 EP0474940 A1 EP 0474940A1 EP 90313555 A EP90313555 A EP 90313555A EP 90313555 A EP90313555 A EP 90313555A EP 0474940 A1 EP0474940 A1 EP 0474940A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- filter
- smoking
- plug
- draw
- resistance
- 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.)
- Granted
Links
- 230000000391 smoking effect Effects 0.000 title claims abstract description 44
- 239000000463 material Substances 0.000 claims abstract description 45
- 235000019504 cigarettes Nutrition 0.000 claims abstract description 34
- 229920002301 cellulose acetate Polymers 0.000 claims abstract description 25
- 230000002093 peripheral effect Effects 0.000 claims description 19
- 238000009423 ventilation Methods 0.000 claims description 16
- 241000208125 Nicotiana Species 0.000 claims description 15
- 235000002637 Nicotiana tabacum Nutrition 0.000 claims description 15
- 238000001914 filtration Methods 0.000 claims description 5
- 239000000796 flavoring agent Substances 0.000 claims description 5
- 239000013618 particulate matter Substances 0.000 claims description 5
- 235000019634 flavors Nutrition 0.000 claims description 4
- 239000002657 fibrous material Substances 0.000 claims 1
- 238000012384 transportation and delivery Methods 0.000 description 10
- 239000000779 smoke Substances 0.000 description 8
- 239000000835 fiber Substances 0.000 description 5
- 229920002678 cellulose Polymers 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 239000011122 softwood Substances 0.000 description 2
- 241000120020 Tela Species 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
- A24D3/04—Tobacco smoke filters characterised by their shape or structure
-
- 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
-
- 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
- A24D3/16—Use of materials for tobacco smoke filters of inorganic materials
- A24D3/163—Carbon
Definitions
- This invention relates to smoking filters, and particularly to concentric smoking filters. More particularly, this invention relates to concentric smoking filters having tow and web filter media portions arranged concentrically.
- Most smoking filters particularly cigarette filters, sold commercially as part of cigarettes consist of a cylindrical rod or "plug" of a "tow” of plasticized cellulose acetate fibers.
- Some filters are variants of the standard filter, having recessed mouth ends, or being made of two plugs placed end-to- end with a space in between, the space being either empty or filled with another material such as charcoal. It is also known to provide such filters having multiple plugs abutting one another, the different plugs differing in density or other characteristics.
- filtering media other than cellulose acetate.
- One such medium is an appropriate sheet or web material.
- the web material which is gathered into a cylindrical plug, can be paper or any other web material, including cellulose acetate in sheet form. When such web materials are used as filters, they are frequently corrugated before being gathered. Paper webs may also be creped to improve tensile strength.
- filters having two or more abutting plugs, at least one of which is cellulose acetate tow, and at least one of which is a web material.
- Concentric filters in which two different forms of cellulose acetate tow -- differing, e.g., in density -- are formed in to a filter.
- One cellulose acetate tow forms a cylindrical "core", while the other tow forms an annular peripheral layer.
- Smoking filters are characterized by various parameters, including pressure drop, which is referred to as resistance-to-draw (“RTD”) and usually measured as the height of a column of water, and efficiency, which is measured as the percentage of the total particulate matter ("TPM”) in the unfiltered smokestream that is trapped by the filter.
- RTD resistance-to-draw
- TPM total particulate matter
- a smoking filter comprising a first filter plug having a central core of a first filter material and a peripheral layer of a second filter material surrounding the central core.
- One of the first and second filter materials is cellulose acetate tow and the other of the first and second filter materials is a gathered corrugated web material.
- cigarette 10 includes a tobacco rod 11 and a first preferred embodiment of a filter 12 according to this invention.
- Tobacco rod 11 is wrapped in conventional wrapper 13, while filter 12 is wrapped by conventional tipping 14.
- Filter 12 includes cellulose acetate tow peripheral layer 20 and central paper core 21.
- Cellulose acetate peripheral layer 20 is a conventional cellulose acetate tow, preferably wrapped by porous plug wrap 22, although self-supporting filter rod technology, such as steam bonding or spray coating of the outer surface of peripheral layer 20, can be used to make a filter that need not be wrapped, if desired.
- Paper core 21 is a paper web that has been corrugated and gathered into cylindrical form and wrapped with plug wrap paper 23.
- Plug wrap 23 improves the processibility of core 21 as well as its aesthetic appearance, and also helps to assure substantially perfect concentricity. Flavorants or other additives, such as soluble tobacco components, could be applied to plug wrap 23 to enhance the subjective impact of the filtered smoke. A similar result might be achieved by forming plug wrap 23 from a tobacco-containing material, such as reconstituted tobacco sheet. Plug wrap 23 is preferably porous, to allow smoke and air to freely move radially between peripheral layer 20 and core 21. At the same time, the presence of plug wrap 23 helps prevent channelling of smoke along the interface between peripheral layer 20 and core 21.
- filter 12 has a circumference of about 24.45 mm and an average weight of about 258 mg.
- the cross-sectional area of core 21 preferably makes up about 60% of the total cross-sectional area of filter 12.
- Filter 12 preferably has an RTD of between about 130 mm W.G. and about 160 mm W.G., with the RTD of central core 21 being between about 350 mm W.G. and about 450 mm W.G.. More preferably, filter 12 has an RTD of about 146 mm W.G., with the RTD of central core 21 being about 400 mm W.G.
- the cellulose acetate tow of peripheral layer 20 is preferably an 8.0/30000 cellulose acetate tow having a denier per fiber of 8, a total denier of 30,000, and a "Y" cross-sectional shape.
- the web of core 21 is preferably a 100% cellulose semi-creped softwood pulp paper with 10% crosswise creping for added tensile strength. Such a paper is available from Tela Toiletfabrik AG, of Balsthal, Switzerland.
- Cigarette 10 is preferably ventilated to between about 65% and about 75% ventilation, and more preferably about 67% ventilation, with appropriate ventilation holes 15 provided in tipping 14. If the surface of filter 12 is not air permeable, appropriate holes would also be provided in filter 12.
- FIGS. 3 and 4 show a cigarette 30 having a second preferred embodiment of filter 31 similar in construction to filter 12, except that core 40 is a tow material and peripheral layer 41 is a web material.
- core 40 is a tow material
- peripheral layer 41 is a web material.
- plug wrap 42 is necessary to contain the web material of peripheral layer 41, while plug wrap or other permeable wrap 43 around tow core 40 is optional, as tow core 40 could be made using self-supporting filter rod technology, as above.
- filter 31 has a circumference of about 24.45 mm and an average weight of about 240 mg.
- the cross-sectional area of core 40 preferably makes up about 60% of the total cross-sectional area of filter 31.
- Filter 31 preferably has an RTD of between about 165 mm W.G. and about 195 mm W.G., with the RTD of central core 40 being between about 285 mm W.G. and about 385 mm W.G. More preferably, filter 31 has an RTD of about 182 mm W.G., with the RTD of central core 40 being about 334 mm W.G.
- the cellulose acetate tow of core 40 is preferably a 1.6/35000 cellulose acetate tow having a denier per fiber of 1.6, a total denier of 35,000, and a "Y" cross-sectional shape.
- the web of peripheral layer 41 is preferably the same 100% cellulose semi-creped softwood pulp paper, with 10% crosswise creping for added tensile strength, that is used in core 21 of filter 12.
- Cigarette 30 is preferably ventilated to between about 65% and about 75% ventilation, and more preferably about 67% ventilation, with appropriate ventilation holes 15 provided in tipping 14, as in cigarette 10.
- FIG. 5 shows a cigarette 50 having a third preferred embodiment of a filter 51 according to the invention.
- Filter 51 is a so-called “dual" filter, made up of two abutting filter segments 52, 53.
- Filter segment 52 which is adjacent tobacco rod 11, is a concentric filter as discussed above, in which one of core 54 and peripheral layer 55 is of a web material and the other of core 54 and peripheral layer 55 is of a tow material.
- Filter segment 53 which is at the mouth end, is a conventional tow filter, such as a cellulose acetate filter, and is provided primarily for cosmetic purposes. Nevertheless, segment 53 has filtration and RTD characteristics, and segment 52 must be adjusted so that the overall filter 51 has the desired characteristics.
- segment 52 is constructed like filter 12, but has a length of only 18-20 mm, while segment 53 is a 7-9 mm long plug of 2.6/42000 cellulose acetate for tow having a denier per fiber of 2.6, a total denier of 42,000, and a "Y" cross-sectional shape.
- Total filter RTD is between about 125 mm W.G. and about 175 mm W.G., preferably about 141 mm W.G.
- the RTD of segment 53 is between about 15 mm W.G. and about 45 mm W.G., preferably about 36 mm W.G.
- the RTD of segment 52 is between about 85 mm W.G.
- Cigarette 50 made with this embodiment of filter 51 is ventilated to between about 65% and about 75% ventilation, preferably about 71% ventilation, with appropriate ventilation holes 15 in tipping 14.
- FIG. 6 shows a cigarette 60 having a fourth embodiment of a filter 61 according to the invention.
- Filter 61 is a recessed filter, made up of filter segment 62 recessed into tipping 14 at 63.
- Filter segment 62 which is adjacent tobacco rod 11, is a concentric filter as discussed above, in which one of core 64 and peripheral layer 65 is of a web material and the other of core 64 and peripheral layer 65 is of a tow material.
- filter parameters discussed herein are given for 85 mm cigarettes. It is to be understood that filters according to the present invention can also be used with longer cigarettes. If a longer cigarette is provided, the filter parameters would have to be adjusted, in accordance with the knowledge of those skilled in the art.
- the cigarette was smoked in a smoking machine under FTC conditions with the following results:
- the cigarette which generates 1.5 mg of "tar" was also smoked by expert smokers, who reported that the cigarette had the taste of a cigarette that generates 4-5 mg of "tar”.
- the filter At 67% ventilation, the filter has an efficiency of about 76%. If there had been no ventilation, the efficiency would have been about 61 %.
- the cigarette also exhibited a pattern of visible deposition of filtrate on the end of the filter much more like a tow filter as opposed to a web filter, even though most of the filtrate was deposited on the web core. This is believed to be the result of the smoke being forced into core 21 as the ventilation air is introduced at holes 15, and then trying to spread back into peripheral tow layer 20 through permeable wrapper 23.
- a filter according to the preferred form of the embodiment of FIG. 5 was prepared and mated to an "ultra-light" tobacco rod having the following characteristics:
- the cigarette was smoked in a smoking machine under FTC conditions with the following results:
- the filter of this invention will improve the taste of low delivery cigarettes. It is also possible that the filter of this invention may offer similar performance at higher deliveries. For example, a medium delivery cigarette may be perceived as a full-flavor cigarette.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Cigarettes, Filters, And Manufacturing Of Filters (AREA)
- Filtering Materials (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
- Undergarments, Swaddling Clothes, Handkerchiefs Or Underwear Materials (AREA)
- Respiratory Apparatuses And Protective Means (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US57187890A | 1990-08-24 | 1990-08-24 | |
US571878 | 1990-08-24 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0474940A1 true EP0474940A1 (de) | 1992-03-18 |
EP0474940B1 EP0474940B1 (de) | 1994-12-14 |
EP0474940B2 EP0474940B2 (de) | 1999-10-06 |
Family
ID=24285429
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90313555A Expired - Lifetime EP0474940B2 (de) | 1990-08-24 | 1990-12-13 | Konzentrischer Rauchfilter mit Filtriermedien aus Fadenmaterial und Bahnmaterial |
Country Status (17)
Country | Link |
---|---|
EP (1) | EP0474940B2 (de) |
JP (1) | JP2767322B2 (de) |
KR (1) | KR0175139B1 (de) |
AT (1) | ATE115369T1 (de) |
AU (1) | AU635095B2 (de) |
CA (1) | CA2031727C (de) |
DE (1) | DE69015185T3 (de) |
DK (1) | DK0474940T4 (de) |
ES (1) | ES2066157T5 (de) |
FI (1) | FI94385C (de) |
GR (2) | GR3015326T3 (de) |
HK (1) | HK162995A (de) |
HU (1) | HU212772B (de) |
NO (1) | NO176464C (de) |
PL (1) | PL166314B1 (de) |
RU (1) | RU1836040C (de) |
TR (1) | TR25717A (de) |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0608047A2 (de) * | 1993-01-19 | 1994-07-27 | Philip Morris Products Inc. | Konzentrischer Rauchfilter mit einem Aussenmantel aus einem Zelluloseazetatstrang und mit einem Kern aus einer Aktivkohle enthaltenden Filterbahn |
EP0638248A1 (de) * | 1993-08-12 | 1995-02-15 | Philip Morris Products Inc. | Verfahren und Einrichtung zur Herstellung von konzentrischen Filtern aus zwei oder mehreren Materialien |
EP0648435A1 (de) * | 1993-10-19 | 1995-04-19 | British-American Tobacco Company Limited | Rauchartikel |
US5622190A (en) * | 1990-08-24 | 1997-04-22 | Philip Morris Incorporated | Concentric smoking filter having cellulose acetate tow periphery and carbon-particle-loaded web filter core |
US5746230A (en) * | 1990-08-24 | 1998-05-05 | Philip Morris Incorporated | Concentric smoking filter having discrete tow and web filter media |
EP0875160A1 (de) * | 1997-04-30 | 1998-11-04 | British-American Tobacco (Germany) GmbH | Ventilierte Filtercigarette mit einem koaxialen Filterelement |
EP0880904A1 (de) | 1997-05-30 | 1998-12-02 | British-American Tobacco (Germany) GmbH | Ultraleicht-Koaxialcigarette mit mehrteiligem Filter |
WO2001064061A1 (de) * | 2000-03-01 | 2001-09-07 | Reemtsma Cigarettenfabriken Gmbh | Rauchartikel |
WO2009156269A1 (en) * | 2008-06-24 | 2009-12-30 | British American Tobacco (Investments) Limited | Filter for a smoking article |
US8550092B2 (en) | 2007-07-17 | 2013-10-08 | British American Tobacco (Investments) Limited | Filter |
CN104188106A (zh) * | 2014-08-28 | 2014-12-10 | 云南中烟工业有限责任公司 | 一种高截留效率的卷烟滤嘴及应用 |
EP3643185A4 (de) * | 2017-06-19 | 2021-05-26 | Japan Tobacco, Inc. | Rauchartikelfilter und herstellungsverfahren dafür |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999025210A1 (de) * | 1997-11-13 | 1999-05-27 | H.F. & Ph.F. Reemtsma Gmbh | Gasphasenreduzierte cigarette |
GB0816933D0 (en) * | 2008-09-16 | 2008-10-22 | British American Tobacco Co | Filter for a smoking article |
CN101999755A (zh) * | 2010-12-17 | 2011-04-06 | 南通烟滤嘴有限责任公司 | 纸芯同轴滤棒 |
WO2014154887A1 (en) | 2013-03-28 | 2014-10-02 | Philip Morris Products S.A. | Smoking article including a flavour delivery member |
KR102391290B1 (ko) * | 2020-04-22 | 2022-04-26 | 주식회사 케이티앤지 | 흡연 물품용 마우스피스 및 이를 포함하는 흡연 물품 조립체와 흡연 물품 패키지 |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3396061A (en) * | 1964-06-01 | 1968-08-06 | Celanese Corp | Smoke filters |
DE2558004A1 (de) * | 1975-10-30 | 1977-05-12 | Liggett & Myers Inc | Zigarettenfilter, verfahren und vorrichtung zu seiner herstellung |
FR2368905A1 (fr) * | 1976-10-28 | 1978-05-26 | Olin Corp | Cigarette aeree aromatisee |
US4355995A (en) * | 1979-03-27 | 1982-10-26 | American Filtrona Corporation | Tobacco smoke filter providing tobacco flavor enrichment, and method for producing same |
FR2518374A1 (fr) * | 1981-12-18 | 1983-06-24 | Filtrona Ltd | Filtre ventile de structure non homogene pour fumee de tabac |
DE3207683A1 (de) * | 1982-03-03 | 1983-09-15 | B.A.T. Cigaretten-Fabriken Gmbh, 2000 Hamburg | Filter |
FR2524274A1 (fr) * | 1982-04-05 | 1983-10-07 | Filtrona Ltd | Filtre a cigarette |
EP0321740A1 (de) * | 1987-12-22 | 1989-06-28 | British-American Tobacco (Germany) GmbH | Koaxialcigarette |
EP0378788A1 (de) * | 1989-01-17 | 1990-07-25 | B.A.T. Cigarettenfabriken GmbH | Koaxiale Filtercigarette |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU4119078A (en) | 1977-11-18 | 1980-05-08 | Philip Morris Inc | Filter system |
US4291711A (en) * | 1979-03-27 | 1981-09-29 | American Filtrona Corporation | Tobacco smoke filter providing tobacco flavor enrichment, and method for producing same |
-
1990
- 1990-12-05 AU AU67748/90A patent/AU635095B2/en not_active Ceased
- 1990-12-07 CA CA002031727A patent/CA2031727C/en not_active Expired - Fee Related
- 1990-12-11 FI FI906092A patent/FI94385C/fi not_active IP Right Cessation
- 1990-12-13 DK DK90313555T patent/DK0474940T4/da active
- 1990-12-13 ES ES90313555T patent/ES2066157T5/es not_active Expired - Lifetime
- 1990-12-13 AT AT90313555T patent/ATE115369T1/de not_active IP Right Cessation
- 1990-12-13 DE DE69015185T patent/DE69015185T3/de not_active Expired - Fee Related
- 1990-12-13 EP EP90313555A patent/EP0474940B2/de not_active Expired - Lifetime
- 1990-12-18 PL PL90288311A patent/PL166314B1/pl unknown
- 1990-12-20 HU HU908366A patent/HU212772B/hu not_active IP Right Cessation
- 1990-12-26 JP JP2414611A patent/JP2767322B2/ja not_active Expired - Fee Related
- 1990-12-26 RU SU904894124A patent/RU1836040C/ru active
- 1990-12-26 TR TR90/1210A patent/TR25717A/xx unknown
- 1990-12-26 KR KR1019900021735A patent/KR0175139B1/ko not_active IP Right Cessation
- 1990-12-28 NO NO905639A patent/NO176464C/no unknown
-
1995
- 1995-03-07 GR GR950400504T patent/GR3015326T3/el unknown
- 1995-10-19 HK HK162995A patent/HK162995A/xx not_active IP Right Cessation
-
1999
- 1999-12-15 GR GR990403230T patent/GR3032144T3/el unknown
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3396061A (en) * | 1964-06-01 | 1968-08-06 | Celanese Corp | Smoke filters |
DE2558004A1 (de) * | 1975-10-30 | 1977-05-12 | Liggett & Myers Inc | Zigarettenfilter, verfahren und vorrichtung zu seiner herstellung |
FR2368905A1 (fr) * | 1976-10-28 | 1978-05-26 | Olin Corp | Cigarette aeree aromatisee |
US4355995A (en) * | 1979-03-27 | 1982-10-26 | American Filtrona Corporation | Tobacco smoke filter providing tobacco flavor enrichment, and method for producing same |
FR2518374A1 (fr) * | 1981-12-18 | 1983-06-24 | Filtrona Ltd | Filtre ventile de structure non homogene pour fumee de tabac |
DE3207683A1 (de) * | 1982-03-03 | 1983-09-15 | B.A.T. Cigaretten-Fabriken Gmbh, 2000 Hamburg | Filter |
FR2524274A1 (fr) * | 1982-04-05 | 1983-10-07 | Filtrona Ltd | Filtre a cigarette |
EP0321740A1 (de) * | 1987-12-22 | 1989-06-28 | British-American Tobacco (Germany) GmbH | Koaxialcigarette |
EP0378788A1 (de) * | 1989-01-17 | 1990-07-25 | B.A.T. Cigarettenfabriken GmbH | Koaxiale Filtercigarette |
Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5622190A (en) * | 1990-08-24 | 1997-04-22 | Philip Morris Incorporated | Concentric smoking filter having cellulose acetate tow periphery and carbon-particle-loaded web filter core |
US5746230A (en) * | 1990-08-24 | 1998-05-05 | Philip Morris Incorporated | Concentric smoking filter having discrete tow and web filter media |
EP0608047A3 (de) * | 1993-01-19 | 1994-11-17 | Philip Morris Prod | Konzentrischer Rauchfilter mit einem Aussenmantel aus einem Zelluloseazetatstrang und mit einem Kern aus einer Aktivkohle enthaltenden Filterbahn. |
EP0608047A2 (de) * | 1993-01-19 | 1994-07-27 | Philip Morris Products Inc. | Konzentrischer Rauchfilter mit einem Aussenmantel aus einem Zelluloseazetatstrang und mit einem Kern aus einer Aktivkohle enthaltenden Filterbahn |
EP0638248A1 (de) * | 1993-08-12 | 1995-02-15 | Philip Morris Products Inc. | Verfahren und Einrichtung zur Herstellung von konzentrischen Filtern aus zwei oder mehreren Materialien |
EP0648435A1 (de) * | 1993-10-19 | 1995-04-19 | British-American Tobacco Company Limited | Rauchartikel |
WO1995010951A1 (en) * | 1993-10-19 | 1995-04-27 | Brown & Willamson Tobacco Corporation | Smoking articles |
US5979459A (en) * | 1997-04-30 | 1999-11-09 | Brown & Williamson Tobacco Corporation | Ventilated filter cigarette with a coaxial filter element |
EP0875160A1 (de) * | 1997-04-30 | 1998-11-04 | British-American Tobacco (Germany) GmbH | Ventilierte Filtercigarette mit einem koaxialen Filterelement |
US6089238A (en) * | 1997-05-30 | 2000-07-18 | Brown & Williamson Tobacco Corporation | Ultralight coaxial cigarette including a multipart filter |
EP0880904A1 (de) | 1997-05-30 | 1998-12-02 | British-American Tobacco (Germany) GmbH | Ultraleicht-Koaxialcigarette mit mehrteiligem Filter |
WO2001064061A1 (de) * | 2000-03-01 | 2001-09-07 | Reemtsma Cigarettenfabriken Gmbh | Rauchartikel |
CZ299205B6 (cs) * | 2000-03-01 | 2008-05-14 | Reemtsma Cigarettenfabriken Gmbh | Kurácký výrobek |
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 |
WO2009156269A1 (en) * | 2008-06-24 | 2009-12-30 | British American Tobacco (Investments) Limited | Filter for a smoking article |
CN102076231A (zh) * | 2008-06-24 | 2011-05-25 | 英美烟草(投资)有限公司 | 用于吸烟制品的过滤嘴 |
CN104188106A (zh) * | 2014-08-28 | 2014-12-10 | 云南中烟工业有限责任公司 | 一种高截留效率的卷烟滤嘴及应用 |
EP3643185A4 (de) * | 2017-06-19 | 2021-05-26 | Japan Tobacco, Inc. | Rauchartikelfilter und herstellungsverfahren dafür |
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