US3219043A - Tobacco smoke filter plug - Google Patents

Tobacco smoke filter plug Download PDF

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Publication number
US3219043A
US3219043A US114382A US11438261A US3219043A US 3219043 A US3219043 A US 3219043A US 114382 A US114382 A US 114382A US 11438261 A US11438261 A US 11438261A US 3219043 A US3219043 A US 3219043A
Authority
US
United States
Prior art keywords
filter
fibers
tow
filaments
rod
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.)
Expired - Lifetime
Application number
US114382A
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English (en)
Inventor
Victor L Erlich
Teague Charles Houston
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.)
Reeves Brothers Inc
Original Assignee
Reeves Brothers Inc
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 to NL279165D priority Critical patent/NL279165A/xx
Application filed by Reeves Brothers Inc filed Critical Reeves Brothers Inc
Priority to US114382A priority patent/US3219043A/en
Priority to BE618378A priority patent/BE618378A/fr
Priority to LU41807D priority patent/LU41807A1/xx
Priority to FR899206A priority patent/FR1330942A/fr
Priority to GB21038/62A priority patent/GB969683A/en
Priority to DER32841A priority patent/DE1242133B/de
Application granted granted Critical
Publication of US3219043A publication Critical patent/US3219043A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • A24D3/08—Use of materials for tobacco smoke filters of organic materials as carrier or major constituent

Definitions

  • One object of the present invention is to provide a new and improved tobacco smoke filter, which forms a coherent unit of predetermined size, and which has improved filtration efficiency and at the same comparatively high air permeability.
  • Another object of the invention is to provide a new and improved tobacco smoke filter having filter elements held in a novel manner into a coherent rigid unit against relative displacement and disintegration.
  • Another object of the invention is to provide a tobacco smoke filter with a new and improved configuration to aiford large bulk in relation to its mass.
  • fibrous filter materials employed for tobacco smoke filters consists of cellulose acetate fibers bonded together by adhesives or solvents.
  • molecularly unoriented poly-alpha-olefin material, and particularly polypropylene fibers have greater filtration efiiciency than have molecularly oriented fibers presenting the same exposed surface area. It is believed that this enhanced filtration efficiency is due to the fact that the stretching and the resulting orientation hardens the fiber including the fiber surface and thus impairs its surface filtering reaction with the materials to be filtered.
  • the molecularly unoriented fibers cannot be highly crimped and particularly cannot be permanently crimped, and this poses a diifiicult problem because of the necessity of creating suflicient surface contact between the smoke gases and the filter material and of creating the required bulk in the tow.
  • the required surface contact and tow bulk is attained as follows without crimping the fibers:
  • the fine poly-alpha-olefin fiber as produced in normal manufacturing processes have circular or slightly oval perimeters and, therefore, present the smallest surface area for any given cross-sectional area or denier of fiber.
  • the ratio of the perimeter to the square root of the crosssectional area in such a fiber is 3.52. By increasing this ratio, greater surface area and in turn higher surface contact for a given cross-sectional area or denier of the fiber is assured.
  • the individual filaments are extruded. with across- 3,219,043 Patented Nov. 23, 1965 of the perimeter to the square root of the cross-sectional area in such a fiber is greater than 3.52.
  • By increasing this ratio of 3.52 greater fiber surface area and in turn higher surface contact for the tobacco smoke for a given cross-sectional area or denier of fiber is assured.
  • the individual filaments are extruded with a cross-section other than round or slightly oval, so that the ratio of the perimeter to the square root of the cross-sectional area is at least 6, and may preferably be as high as 10 or even higher. This greater ratio at least doubles the surface activity of the fiber compared with that of a circular one.
  • a desirable form in which the filament may be extruded is one in which the filament is provided with a series of surface fiutes extending longitudinally thereof.
  • the filament in that form desirably has a cross-section comprising projections or arms radiating from a central core and more specifically may assume the cross-sectional shape of a cross or a star with a comparatively small central core or backbone from which the arms or points radially project.
  • the filters are helically twisted in the range of /4 to 2 turns per inch.
  • This twisting can be done without molecularly orienting the individual fibers by twisting the fibers individually or by twisting bundles of the fibers but desirably the twisting is done on the tow which has the bulk and size necessary to form the final filter rod from which the individual filter units are cut.
  • This twisting brings the filaments or bundles into helical shape, which further improves the surface efficiency of the filter, increases the bulk and simultaneously provides a mechanical bond of the filament within the filter body.
  • This mechanical bond is suflicient to make the use of adhesives or other bonding processes less imperative, and such other bonding processes may even be dispensed with.
  • additional bonding can be applied if it should be found to be desirable.
  • Filter bodies prepared as described may be subjected to a surface treatment before or after twisting in order to stiffen the filter rod.
  • a surface treatment can be performed by passing the filter rod through a bath holding, for example, low melting paraffin wax at a temperature above its melting point, so that the wax Will be in sufliciently fluid condition.
  • a bath temperature of between and 120 C. will be adequate to deposit a thin layer of wax on the surface of the filter rod when the latter passes at high speed through the wax bath.
  • the filter rod in its final twisted form is cooled in air and the then solidified wax layer on the surface will stiffen the rod without impairing the permeability of the filter body or plug cut from said rod.
  • a hath made up of a solution of parafiin wax in a low boiling solvent, as for example, pure hexane, or a fine dispersion of the wax in water may be employed.
  • a hath made up of a solution of parafiin wax in a low boiling solvent, as for example, pure hexane, or a fine dispersion of the wax in water may be employed.
  • the rod After the rod has been passed through this bath, it may, for example, be heated in a stream of hot air, to cause the solvent or water to be evaporated, leaving behind a thin outer surface of wax over the rod.
  • stereospecific polypropylenes is meant a polypropylene having a molecular structure in which the side chains branch out from the linear parafiinic backbone or nucleus into the molecular space in orderly predetermined directions as distinguished from a molecular structure in which the side chains branch out randomly in opposite directions from the linear paraffinic backbone.
  • stereospecific polymers are sometimes also designated as isotactic or syndiotactic depending on the specific orderly arrangement of the side chains in one or in alternate directions.
  • this tow In forming the tow for the filter, it is desirable for this tow to contain not less than 60% by weight of stereospecific polypropylene and especially isotactic propylene.
  • FIG. 1 is a flow diagram showing in side elevation an apparatus for carrying out an embodiment of the process of the present invention
  • FIG. 3 shows a specific embodiment on an enlarged scale of another form of cross-section of a filament from which the cigarette filter of the present invention can be made;
  • FIG. 4 is a side elevation on an enlarged scale of the tow after it has been twisted and before it has been cut into cigarette elements and the elements wrapped for incorporation into a cigarette;
  • FIG. 5 is an enlarged longitudinal section through a portion of a tipped cigarette assembled with a filter plug of the present invention.
  • the fibers for the tobacco smoke filter unit are made of poly-alpha-olefins and desirably of stereospecific polypropylene, and more specifically isotactic polypropylene having a molecular weight of around 300,000.
  • the polymer is melted and extruded through dies or spinnerettes which have orifices or holes therein in the shape of the desired cross-section determining the shape of the filaments after extrusion and cooling.
  • this shape may be of any non-circular form provided it gives the above mentioned high ratio of perimeter to the square root of the cross-sectional area, but it is desirably in the form of a star with a small central backbone, as described.
  • FIGS. 2 and 3 show filaments extruded in different forms in accordance with the present invention.
  • each die has a number of orifices or holes through which a number of filaments respectively are extruded. These filaments solidify upon cooling and prior to being collected to form a bundle. A number of such bundles are combined to form a continuous tow having the bulk of the cigarette filter plug or unit, which usually is 25 mm. in circumference.
  • the number of individual filaments necessary to form such a tow depends on the size and shape of the individual filaments.
  • These filaments will not be molecularly oriented, and desirably should have a denier of between 2 and 30.
  • each of cross potent cross-section i.e. of cruciform cross-section with T-shaped radiating arms, as shown in FIG. 2 are combined to form a tow.
  • Each filament has a size corresponding to 13 denier, i.e. a weight of 13 grams for a length of 9,000 meters, so that the tow will have a total denier of 65,000 and has a ratio of perimeter to the square-root of the cross-sectional area of 11 to 1.
  • Cigarettes were also made with filter plugs 25 mm. in circumference and 17 mm. in length from a tow formed of the same number of polypropylene filaments, which were made of the same size and shape as the molecularly unoriented filaments but which were molecularly oriented after being extruded.
  • Cigarettes with and without filters were smoked on smoking devices well known in the art for testing, and the respective nicotine and total contents were determined in mg. per cigarette. In each case, the draft resistance was determined and the results were compared on the basis of the same draft resistance. Under these conditions, the nicotine absorption was 59.5% for the filters containing the molecularly oriented fibers and 77.1% for those containing the molecularly unoriented fibers. The total solids contents absorbed by the filters were respectively 58.5% and 78.2% of that contained in the smoke when smoking the cigarettes without filters.
  • 11,000 molecularly unoriented isotactic polypropylene filaments of 5 denier having a seven-pointed star cross-section as shown in FIGURE 3, and with a ratio of perimeter to square root of the cross-sectional area of 9:1, are combined to form a tow having a total of 55,000 and having the required circumference of 25 mm.
  • the tow 10 which is made in accordance with either of the two embodiments described above and which consists of molecularly unoriented filaments of isotactic polypropylene shaped as shown in FIGURE 2 or 3, is supplied in the form of a compressed bale 11 from which the tow is taken off continuously at high speed by means of driven Godet rolls 12.
  • the tow 10 is then passed through the field of action of a yarn twisting machine 13 well known in the art for helically twisting yarn or rope.
  • the twisting is done with little or no tension on the filaments to prevent orientation.
  • the twisted tow is then passed through a heating device 14 where the tow is exposed for a short period to a temperature of about 135 C., so that the tow is heat set in its twisted condition and its helical formation thereby stabilized to form a continuous filter rod 10a.
  • the twisted heat set filter rod 10a is then passed through a bath 15 holding low melting wax, preferably paraflin wax, at a temperature of about C., which is above the melting point 'of the wax and which renders the bath fluid enough to deposit a thin layer of wax on the outer surface of the filter rod as the rod passes at high speed through the bath.
  • the rod 10a in its final twisted form, covered with a thin layer of wax, is cooled in air, causing the wax to solidify and thereby to exert a stiffening effect on the rod without impairing the permeability of the filter rod.
  • the rod 10a formed as described may then be processed by the usual well-known cigarette filter making mechanism to form the filter mouthpieces or plug for combination with the tobacco holding parts of the cigarettes.
  • the rod 10a may be wrapped with cigarett paper by a wrapper folding device 16 and then cut by cutter 17 into segments to form filter pieces or plugs 18.
  • These filter pieces 18 with individual wrappers 20 are then combined with the tobacco holding parts 21 of the cigarettes in their paper wrapper 22 by overlapping folios 23.
  • the length of the filter mouthpieces 18 varies, and
  • a cigarette may be for instance 17 mm. in a cigarette having a total length of 85 mm.
  • the length of th filter plugs cut from the continuous filter rod may be 102 mm. and these may then be later subdivided to the lengths of the filter units required for One cigarette.
  • the tow may be blended from out staples ranging in length, for example, from about 1 cm. to about 5 cm. or may be blended from a combination of continuous monofilaments and cut staples.
  • the tow of molecularly unoriented filaments was conducted through the yarn twisting device 13 as is knOWn in regular textile operation.
  • the individual filaments or individual bundles of filaments supplied by the extruder or spinnerett units were helically twisted prior to being combined into the final tow.
  • the final tow formed from individually twisted filaments or twisted bundles was itself twisted to produce the rod used for the cigarette filter.
  • the first and third embodiments are particularly advantageous because the twist serves to hold the filaments against relative axial displacement.
  • the construction of the filter plugs are such as to lend themselves to manufacture by continuous massproducing processes employing some of the devices now being employed in the manufacture of existing filter plugs.
  • a rod-like filter element short enough and slender enough to form a filter plug in a tobacco smokable article, such as a cigarette, and having sufficient permeability to draw tobacco smok easily therethrough in the process of smoking said article, said element being made up essentially of substantially molecularly unoriented poly-alpha-olefin fibers extending side by side along the length of said element, said fibers being bonded into a plug unit by a poly-alpha-olefin material of a melting point lower than that of said unoriented fibers, said fibers being uncrimped and helically twisted together below the point where th fibers would be stretched sufiiciently to produce molecular orientation.
  • a rod-like filter element short enough and slender enough to form a filter plug in a tobacco smokable article, such as a cigarette, and having sufiicient permeability to draw tobacco smoke easily therethrough in the process of smoking said article, said element consisting essentially of substantially molecularly unoriented poly-alphaolefin fibers, said fibers being a blend of two types having different melting points, the fibers of lower melting point being integrally bonded to fibers of higher melting point, said fibers being uncrimped and helically twisted together below the point where the fibers would be stretched sufiiciently to produce molecular orientation.
  • a rod-like filter element short enough and slender enough to form a filter plug in a tobacco smokable article, Such as a cigarette, and having suflicient permeability to draw tobacco smoke easily therethrough in the process of smoking said article, said element consisting essentially of substantially molecularly unoriented poly-alpha-olefin fibers, said fibers being a blend of two types having different melting points and extending side by side along said element, the fibers of higher melting point constituting the major portion of the fibers and consisting of polypropylene, said fibers being uncrimped and helically twisted together below the point where the fibers would be stretched sutficiently to produce molecular orientation.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Cigarettes, Filters, And Manufacturing Of Filters (AREA)
US114382A 1961-06-02 1961-06-02 Tobacco smoke filter plug Expired - Lifetime US3219043A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
NL279165D NL279165A (en, 2012) 1961-06-02
US114382A US3219043A (en) 1961-06-02 1961-06-02 Tobacco smoke filter plug
BE618378A BE618378A (fr) 1961-06-02 1962-05-30 Filtres pour la fumée de tabac et procédé de production de ces filtres
LU41807D LU41807A1 (en, 2012) 1961-06-02 1962-05-30
FR899206A FR1330942A (fr) 1961-06-02 1962-05-30 Filtres pour la fumée de tabac et procédé de production de ces filtres
GB21038/62A GB969683A (en) 1961-06-02 1962-05-31 Tobacco smoke filters and process of manufacturing the same
DER32841A DE1242133B (de) 1961-06-02 1962-06-01 Stabfoermiges Tabakrauchfilterelement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US114382A US3219043A (en) 1961-06-02 1961-06-02 Tobacco smoke filter plug

Publications (1)

Publication Number Publication Date
US3219043A true US3219043A (en) 1965-11-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
US114382A Expired - Lifetime US3219043A (en) 1961-06-02 1961-06-02 Tobacco smoke filter plug

Country Status (7)

Country Link
US (1) US3219043A (en, 2012)
BE (1) BE618378A (en, 2012)
DE (1) DE1242133B (en, 2012)
FR (1) FR1330942A (en, 2012)
GB (1) GB969683A (en, 2012)
LU (1) LU41807A1 (en, 2012)
NL (1) NL279165A (en, 2012)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3421612A (en) * 1965-08-30 1969-01-14 Sperry Rand Corp Lister attachment for high speed web printers
US3470008A (en) * 1965-09-27 1969-09-30 Celanese Corp Process for making paperless cigarette filter
US3516419A (en) * 1969-02-27 1970-06-23 John Kalsey Cigarette filter element
US3595245A (en) * 1968-08-14 1971-07-27 Exxon Research Engineering Co Cigarette filter from polypropylene fibers
US20100300468A1 (en) * 2007-12-21 2010-12-02 Rhodia Acetow Gmbh Filter tow bale, method and device for producing a filter tow bale and filter tow strips
WO2014018446A1 (en) * 2012-07-25 2014-01-30 Celanese Acetate Llc Spinneret comprising tri-arc holes and tri-arc filaments produced therefrom
US8790556B2 (en) 2012-07-25 2014-07-29 Celanese Acetate Llc Process of making tri-arc filaments
US20180338522A1 (en) * 2015-08-28 2018-11-29 Jt International S.A. Smoking article
WO2025088014A1 (en) * 2023-10-26 2025-05-01 Philip Morris Products S.A. A method for forming a filter element by twisting

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1748591A (zh) * 2005-11-07 2006-03-22 夏侯晓雷 一种过滤嘴
HK1220087A1 (zh) * 2013-07-18 2017-04-28 Philip Morris Products S.A. 具有窗口的吸烟制品包装材料
CN106690411A (zh) * 2016-12-09 2017-05-24 河南中烟工业有限责任公司 一种奶油香味醋纤丝束及其在细支卷烟中的应用

Citations (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB380041A (en) * 1931-03-06 1932-09-06 Abraham Wix Improvements in or relating to cigarettes
US2357392A (en) * 1941-03-01 1944-09-05 Sylvania Ind Corp Process for producing fibrous products
US2459545A (en) * 1946-04-05 1949-01-18 All American Airways Inc Life line
US2474124A (en) * 1946-03-08 1949-06-21 All American Airways Inc Parachute leader
US2688380A (en) * 1951-07-13 1954-09-07 American Viscose Corp Filter cartridge
US2774680A (en) * 1953-10-07 1956-12-18 Edward J Hackney Process for making aerosol filters
CH320734A (fr) * 1953-07-13 1957-04-15 Lorillard Co P Filtre pour la fumée de tabac et procédé pour sa fabrication
US2825120A (en) * 1954-05-11 1958-03-04 Eastman Kodak Co Synthetic filament
US2828752A (en) * 1954-08-16 1958-04-01 Eastman Kodak Co Fibrous tobacco smoke filters
US2904050A (en) * 1955-01-05 1959-09-15 Eastman Kodak Co Tobacco smoke filtering elements
US2908669A (en) * 1956-10-18 1959-10-13 Eastman Kodak Co Polymerization of olefins with metal oxide catalysts promoted by alkali metal alkyls
US2916038A (en) * 1954-02-23 1959-12-08 American Viscose Corp Tobacco smoke filter
US2966157A (en) * 1957-06-07 1960-12-27 Eastman Kodak Co Polyolefin tobacco smoke filters
US3019507A (en) * 1959-02-18 1962-02-06 Montedison Spa Method of making bulky continuous filament yarns of isotactic polyolefins
US3023075A (en) * 1954-10-26 1962-02-27 British Celanese Fibrous material
US3025130A (en) * 1959-02-03 1962-03-13 Celanese Corp Wet spinning of low density cellulose acetate filaments
US3038478A (en) * 1960-05-23 1962-06-12 Eastman Kodak Co Method for producing rigid tobacco smoke filters
US3092873A (en) * 1958-10-17 1963-06-11 Celanese Corp Spinneret
US3144025A (en) * 1960-04-25 1964-08-11 Reeves Bros Inc Tobacco smoke filters

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE360558C (de) * 1915-07-31 1922-10-04 Emil Stoeckel Rauchfilter fuer Zigarettenhuelsen
CH325071A (de) * 1953-06-30 1957-10-31 Algemene Kunstzijde Unie Nv Verfahren zur Herstellung von Zigarettenfiltern und nach diesem Verfahren hergestellter Zigarettenfilter
DE1136256B (de) * 1954-08-16 1962-09-06 Eastman Kodak Co Aus Faeden bestehender Strang zum Herstellen von Filterelementen fuer Tabakrauchfilter
CH345578A (de) * 1956-06-26 1960-03-31 Mueller Paul Adolf Dipl Ing Anwendung von Kunststoff-Fasern
DE1084626B (de) * 1957-06-07 1960-06-30 Eastman Kodak Co Tabakrauchfilterelement

Patent Citations (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB380041A (en) * 1931-03-06 1932-09-06 Abraham Wix Improvements in or relating to cigarettes
US2357392A (en) * 1941-03-01 1944-09-05 Sylvania Ind Corp Process for producing fibrous products
US2474124A (en) * 1946-03-08 1949-06-21 All American Airways Inc Parachute leader
US2459545A (en) * 1946-04-05 1949-01-18 All American Airways Inc Life line
US2688380A (en) * 1951-07-13 1954-09-07 American Viscose Corp Filter cartridge
CH320734A (fr) * 1953-07-13 1957-04-15 Lorillard Co P Filtre pour la fumée de tabac et procédé pour sa fabrication
US3039908A (en) * 1953-07-13 1962-06-19 Hollingsworth & Vose Co Method of making a tobacco smoke filter
US2774680A (en) * 1953-10-07 1956-12-18 Edward J Hackney Process for making aerosol filters
US2916038A (en) * 1954-02-23 1959-12-08 American Viscose Corp Tobacco smoke filter
US2825120A (en) * 1954-05-11 1958-03-04 Eastman Kodak Co Synthetic filament
US2828752A (en) * 1954-08-16 1958-04-01 Eastman Kodak Co Fibrous tobacco smoke filters
US3023075A (en) * 1954-10-26 1962-02-27 British Celanese Fibrous material
US2904050A (en) * 1955-01-05 1959-09-15 Eastman Kodak Co Tobacco smoke filtering elements
US2908669A (en) * 1956-10-18 1959-10-13 Eastman Kodak Co Polymerization of olefins with metal oxide catalysts promoted by alkali metal alkyls
US2966157A (en) * 1957-06-07 1960-12-27 Eastman Kodak Co Polyolefin tobacco smoke filters
US3092873A (en) * 1958-10-17 1963-06-11 Celanese Corp Spinneret
US3025130A (en) * 1959-02-03 1962-03-13 Celanese Corp Wet spinning of low density cellulose acetate filaments
US3019507A (en) * 1959-02-18 1962-02-06 Montedison Spa Method of making bulky continuous filament yarns of isotactic polyolefins
US3144025A (en) * 1960-04-25 1964-08-11 Reeves Bros Inc Tobacco smoke filters
US3038478A (en) * 1960-05-23 1962-06-12 Eastman Kodak Co Method for producing rigid tobacco smoke filters

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3421612A (en) * 1965-08-30 1969-01-14 Sperry Rand Corp Lister attachment for high speed web printers
US3470008A (en) * 1965-09-27 1969-09-30 Celanese Corp Process for making paperless cigarette filter
US3595245A (en) * 1968-08-14 1971-07-27 Exxon Research Engineering Co Cigarette filter from polypropylene fibers
US3516419A (en) * 1969-02-27 1970-06-23 John Kalsey Cigarette filter element
US20100300468A1 (en) * 2007-12-21 2010-12-02 Rhodia Acetow Gmbh Filter tow bale, method and device for producing a filter tow bale and filter tow strips
WO2014018446A1 (en) * 2012-07-25 2014-01-30 Celanese Acetate Llc Spinneret comprising tri-arc holes and tri-arc filaments produced therefrom
US8790556B2 (en) 2012-07-25 2014-07-29 Celanese Acetate Llc Process of making tri-arc filaments
US20180338522A1 (en) * 2015-08-28 2018-11-29 Jt International S.A. Smoking article
WO2025088014A1 (en) * 2023-10-26 2025-05-01 Philip Morris Products S.A. A method for forming a filter element by twisting

Also Published As

Publication number Publication date
GB969683A (en) 1964-09-16
BE618378A (fr) 1962-11-30
FR1330942A (fr) 1963-06-28
DE1242133B (de) 1967-06-08
NL279165A (en, 2012)
LU41807A1 (en, 2012) 1962-07-30

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