US3039908A - Method of making a tobacco smoke filter - Google Patents

Method of making a tobacco smoke filter Download PDF

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Publication number
US3039908A
US3039908A US367499A US36749953A US3039908A US 3039908 A US3039908 A US 3039908A US 367499 A US367499 A US 367499A US 36749953 A US36749953 A US 36749953A US 3039908 A US3039908 A US 3039908A
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United States
Prior art keywords
diameter
roving
fibers
rope
filter
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Expired - Lifetime
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US367499A
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English (en)
Inventor
Harris B Parmele
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Hollingsworth and Vose Co
P Lorillard Co
Original Assignee
Hollingsworth and Vose Co
P Lorillard Co
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Application filed by Hollingsworth and Vose Co, P Lorillard Co filed Critical Hollingsworth and Vose Co
Priority to US367499A priority Critical patent/US3039908A/en
Priority to GB19501/54A priority patent/GB752600A/en
Priority to CH320734D priority patent/CH320734A/fr
Application granted granted Critical
Publication of US3039908A publication Critical patent/US3039908A/en
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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
    • A24D3/02—Manufacture of tobacco smoke filters
    • A24D3/0229—Filter rod forming processes
    • A24D3/0233—Filter rod forming processes by means of a garniture
    • 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
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y10T156/1002—Methods of surface bonding and/or assembly therefor with permanent bending or reshaping or surface deformation of self sustaining lamina
    • Y10T156/1007—Running or continuous length work
    • Y10T156/1008—Longitudinal bending

Definitions

  • particle sizes in tobacco smoke range from about 0.1 to 1.0 micron in diameter, Varying according to the smoking conditions, such as draft, heat, nature of tobacco, and the like.
  • those particles which impart flavor and aroma i.e., those which give the smoker satisfaction, are relatively small in size, being on the order of about 0.1 to about 0.4 micron in diameter, exist in far greater proportion in the smoke than do the larger particles which have diameters from about 0.4 to about 1.0 micron.
  • the volumetric ratio of smaller particles is about 60% to 80% to about 20% to 40% of the larger particles, the numerical ratio is upwards of ten to one.
  • textile fibers of substantially uniform diameter, but of random length are arranged heterogeneously in a semi-felted cylindrical mass affording a labyrinth of extremely fine but highly tortuous passages through which the smoke is drawn and in which its direction is sharply changed countless times in such a way that the larger particles are selectively thrown out of the smoke stream to become trapped in the passages, thereby leaving the smaller tasteand aroma-producing particles in the smoke passing into the mouth of the smoker.
  • the fibers are stiffened and are bound together in the aforementioned heterogeneous arrangement by a suitable inert binder, so that the filter is rendered sufiiciently firm and resilient not to be readily compressed between the smokers lips to such a degree that freedom of draw and consequent flow of smoke is materially impaired.
  • a preferred method of making the selective tobacco smoke filter according to this invention comprises semifelting the random lengths of fiber in a loose web, gathering the same into a roving having a diameter several times that of the finished filter, compressing the roving radially, i.e., contracting it circumferentially into a rope having a fraction of the diameter of the roving to thereby reduce the macro-voids therein to micro-voids, wrapping the rope in a tubular paper wrapper, and severing the wrapped rope into units or plugs of the desired length for incorporation in a cigarette or other smokers article.
  • thermo-responsive binding material Prior to gathering the semi-felted web of fibers into the roving, or during the roving formation, a thermo-responsive binding material is mixed or otherwise incorporated in or applied to the fibers and thereafter the roving is heated to a sufiicient degree to activate the binder and cause it to hold the fibers in the aforementioned heterogeneous relation and to impart firmness and resiliency thereto.
  • the activation of the thermo-responsive binder is eifected after the roving has been compressed into the reduced-diameter rope, but prior to severing the same.
  • the tobacco smoke filter of this invention and the method of making the same according to this invention provide an eflicient and highly selective means for removing the larger toxicity-aggravating particles without noticeably impairing the satisfaction which the smoker derives from the tobacco.
  • FIGURE 1 is a schematic diagram of the apparatus for making the filter according to the method of this invention, and illustrates the successive steps of forming the roving, radially compressing it into a reduced-diameter rope, wrapping it in paper, heat-activating the thermoresponsive binder, cooling the rope to set the binder, and severing the rope into finished filter units or plugs;
  • FIG. 2 is an enlarged perspective view of one of the filter units embodying the invention and made according to the method of this invention, the tubular paper cover being shown partially unwrapped to expose the filter portion and to generally indicate its construction;
  • FIG. 3 represents a microscopic view of a portion of the filter of FIG. 2, and illustrates the random, heterogeneous arrangement of the fibers and the binder holding them in that arrangement by securing contacting fibers together at their points of contact, and
  • FIG. 4 represents a larger microscopic view of a portion of the filter made according to a modification of the resin-treating step of the fibers.
  • fibers of textile grade having diameters of about 2 to about 5 denier (about 14 to about 23 microns) and of random lengths between about .03 to about 2.0 inches are stirred and mixed together so that they are highly intermingled in a heterogeneous mass with the shorter fibers lying at various angles across the longer fibers in a non-parallel arrangement to form a thin, loose, semi-felted web capable of being handled, but having little self-sustaining strength.
  • Natural fibers of vegetable origin such as cotton, or synthetic fibers, such as cellulose acetate, acetate rayon, vis cose, nylon and the like, of the aforementioned diameters and lengths, may be used alone or as mixtures of two or more of them, regardless of their nature.
  • the diameter of such mineral fiber is on the order of 3 microns or less and in that case the labyrinthine filtration effect is augmented by impingement of the smoke particles on the fine mineral fibers or their equivalents, in the manner described in copending application Serial No. 260,187, filed December 6, 1951, by Harold W. Knudson, now Patent No. 2,761,798, issued September 4, 1956.
  • the semi-felted web so formed is gathered into a roving according to usual textile practice, i.e., with the long fibers extending generally longitudinally, the quantity of the gathered fibers being such that the roving will have a diameter several times the diameter of the ultimate filter unit or plug.
  • the finished diameter of the filter unit is to be, say, 0.3 inch
  • the free diameter of the roving would be at least twice and up to ten times larger, or between about 0.6 and about 3 inches in free diameter.
  • the roving that is supplied to the plugmaking machine be made up of several relatively small diameter strands formed in the same way from the semifelted web and then combined into a single roving of the said diameter for supply to the plug-making machine.
  • strands of the semi-felted fibers are formed in the manner described but of diameters such that when the predetermined number thereof are brought together into a single roving the latter will have the requisite diameter.
  • FIG. 1 three reels 10, 11 and 12, each containing the respective strands 13, 14 and 15 to be combined, are illustrated in FIG. 1 as journalled on a suitable frame 16 and simultaneously feeding into the conical thimble or eye 17 where they are combined into the roving 18.
  • the free diameter of the roving 18 is to be about one inch
  • the diameter of the individual strands 13, 14 and 15 from which the single roving 18 is made will be about one-third inch.
  • the strands 13, 14 and 15 would be about one-fourth inch in diameter and four corresponding reels then used.
  • the three strands 13, 14 and 15 are lightly twisted to further improve cross-sectional uniformity by averaging out the aforementioned inherent irregularities.
  • One convenient way to effect such a light twist is to slowly rotate the gathering thimble 17 about its axis as by a suitably driven belt 19, or the like, the interior of the thimble 17 being knurled or otherwise roughened to afiord a sufliciently frictional surface.
  • the lightly twisted roving 18 is then uniformly compressed radially to the rope 21 having the desired diameter of about 0.3 inch in the tapering cone 2% leading to the plug-making machine of the general type shown in my Patent No. 2,793,572, issued May 28, 1957.
  • the rope 21 is wrapped in a strip of paper 22, such as cigarette paper, supplied from spool 23 to the wrapping mechanism schematically shown at 24 in FIG. 1.
  • the seam of the relatively tubular paper wrapper 25 is sealed at 26, and, subject to certain preferred intermediate steps, may then be severed into units 27 of about three inches long by the flying knife mechanism indicated at 28.
  • each filter is cut into shorter lengths, assembled with tobacco and again severed to form the filter of a cigarette, each filter having a length of about one-half inch and the diameter of the finished cigarette, which may be about 0.3 inch, the diameter of the rope 21 in the given example.
  • the purpose of the radial compression of the roving 18 from a free diameter to a fraction thereof into the rope 21 is to reduce the macro-voids therein to microvoids, so that all tortuous passages therethrough have a minimum diameter less than the diameter of the large particles, i.e., those larger than 0.4 micron in diameter.
  • FIG. 2 The random, heterogeneous arrangement of the fibers constituting the radially compressed plug 21 is generally illustrated in FIG. 2, from which it will be seen that a labyrinth of myriad highly tortuous passages is formed through the interior of the tubular wrapper 25, as shown partially unwrapped in FIG. 2.
  • a plug of about one-half inch in length and the diameter of a cigarette contains approximately two miles of fiber and approximately 54 /2 miles of air passages, the latter considered for comparison, as having average diameters of 3 microns.
  • the void portion of the plug is extremely finely subdivided, so as to be an effective filter to remove up to the desired physiological amount of harmful solids and yet afford a satisfactory draw and the conduction of the desirable aroma and taste components of the cigarette smoke.
  • the degree of the reduction in size of the macrovoids is dependent upon the amount of radial compression which takes place between the initial roving 18 and the finished rope 21 and plug 27. Consequently, a larger diameter roving suffers a greater reduction of the macro-voids than does a smaller diameter roving, and in this way, the passage size can be predetermined with reasonable accuracy. Passage size can also be predetermined by a preselection of the diameter of the fiber in the range of between about two and about twentynine microns, for example, and by a choice of the quantity of such fibers employed.
  • the fibers need not be of uniform diameter, it has been found that passage regulation by radial com pression is facilitated when the fibers are of uniform diameter, but of indiscriminately varying length within the aforementioned length range.
  • the fibers should be of a fineness such as to be silky and not prickly to the tongue or skin, even when of short length.
  • the fibers should be materially less in diameter than the diameter of human hair, as described in Betts Patent No. 2,327,991.
  • the liquid may be resin dissolved in a solvent vehicle or a slurry of finely-divided resin in water.
  • the extent of this application of binder approximates 15% by weight, and the binder preferably is of the thermo-setting type, such as a phenolic-formaldehyde.
  • the moist web is then gathered into the roving or strands, as described.
  • the roving or strands is then passed through a heating zone where it is heated to a temperature suificient to cure or set the resin.
  • the degree of heating employed and the length of time for exposure thereto is selected to accomplish proper curing without undue discoloration of the binder.
  • Each fiber is encased in a thin film of resin, which renders it resilient.
  • the resin coating is indicated at 33 in FIG. 4 as enveloping each fiber.
  • the points of contact of adjacent fibers are secured together by the binder.
  • the rope 21 is firm but resilient.
  • the inherent flexibility of the resin-coated fibers enables them to flex spring-like during compression. It will be understood that the diameter of the fibers 31 will be increased slightly by the thickness of the coating 33.
  • thermo-responsive binder in uncured or inactive condition, either in the form of a dry powder, staple or filaments.
  • a dry powder, staple or filaments one convenient way of incorporating the thermo-responsive binder is to mix it with the fibers during semi-felting in the web before the latter is formed into the roving 18 or roving-forming strands 13, 14, 15.
  • the binder in dry form is incorporated in the roving or strands either by mixing the fine powder or the staple in the web prior to its formation into the roving or strands, or as continuous filaments in the roving or strands 13, 14, 15 when the web is gathered into such roving or strands.
  • thermo-responsive resin throughout the eventual rope and consequent uniform distribution of the binding points are obtained.
  • a plurality of filaments of thermo-responsive material are fed into and thus are distributed throughout the roving or strands.
  • the volume of resin to fiber by weight is between about to about 25%, depending on the gauge of the thermoresponsive filaments.
  • binder staples or filaments are larger in diameter than the filter fibers and may be from about 2 to about 8 denier, i.e., on the order of about 14 to about 29 microns diameter.
  • Any suitable thermo-plastic resin, in the form of powder, staple or filament, having a fusion point below about 300 F., the scorching temperature of the paper wrapper 25, and above a dead storage temperature of about 150 F. and being otherwise inert as well as odorless and tasteless will serve the purpose.
  • thermo-responsive resins examples are vinylidine chloride, vinyl copolymer, polyethylene, polystyrene, and their equivalents which are variously identified by the trade names Plas-Teca, V-inyon, Polythene, Lucite, Lustron, Dynel, and the like.
  • the thermo-responsive resins may be applied in a liquid suspension or slurry and sprayed on the web prior to gathering the web into the roving 18 or strands 13, '14, as previously described, but deferring the setting or thermoactivation of the binder until after the roving is formed into the rope 21.
  • the paper-wrapped rope after the seam of the paper wrapper 25 is sealed at 26, is passed through a heating zone indicated at 29 in FIG. 1, wherein the resin is heated to the curing or setting temperature to bind the fibers together in the manner described.
  • the heating means of heating zone 29 may be of any desired type, but in order that the heating zone 29 is not inordinately long for use with modern high-speed plug-making machinery, a quick and penetrating heat is preferred, such as that induced by a high-frequency induction coil, in the field of dielectric plates, infra-red ray heat emitting coils, or the like, through, between or adjacent which the wrapped rope passes.
  • the heatsoftened resin must be cooled before severing at 28 and to that end, the wrapped rope is cooled in a suitable cooling zone 30, which may be afforded by a blast of air through refrigerating coils, or the like.
  • a suitable cooling zone 30 which may be afforded by a blast of air through refrigerating coils, or the like.
  • cooling is not essential where thermo-setting resins are used as a binder, cooling down before severing at 28 is nevertheless preferred. Cooling may be rendered unnecessary by applying the resin-activating heat after therope has been severed into the shorter lengths 27.
  • the fibers are held together by the binder in the aforementioned compressed, heterogeneous arrangement, which is generally illustrated in FIG. 3, which is an enlargement of a section of FIG. 2, and in which the fibers constituting the filter are designated 31 and the binder is designated 32.
  • FIG. 3 which is an enlargement of a section of FIG. 2, and in which the fibers constituting the filter are designated 31 and the binder is designated 32.
  • the ratio of gross passage volume to gross solid volume indicated by FIG. 3 is very large. I have calculated the ratio to be on the order of 25 to 1 where glass fibers on the order of about 3 microns diameter are used, thereby indicating that the porosity of the filter volume is high so as not to impair the draw, notwithstanding the high degree of filtering efiiciency of the filter in selectively removing the larger particles from the smoke drawn therethrough.
  • wrapper instead of wrapping the rope 21 in the paper 25, equivalent wrapping or conforming means such as cellophane or a sprayed coating of molten resin, a resin slurry or solution or the like may be employed to hold the rope 21 in its confined form after the resin envelope has been cured, set, or dried in the manner described in connection with the binder resin, and accordingly the term wrapper as used herein and in the appended claims applies equally well to a sheet material wrapper and a plastic wrapper applied and formed in situ in the manner described.
  • a method of making cylindrical tobacco smoke filter units which comprises mixing fibers of random lengths between about .03 and about 2.0 inches to form a heterogeneous mass, gathering said mass into an elongated roving having a diameter in excess of the diameter of the finished filter unit and having macro-voids between the fibers, radially compressing the roving into a rope having approximately the diameter of the finished filter unit to reduce the macro-voids to micro-voids, wrapping the rope with sheet material, and severing the rope into filter units.
  • a method of making cylindrical tobacco smoke filter units which comprises mixing fibers having diameters between about two and about twenty-nine microns into a heterogeneous mass, gathering said mass into an elongated roving having a diameter two to ten times the diameter of the finished filter unit and having macrovoids between said fibers, radially compressing the roving into a rope having approximately the diameter of the finished filter unit to reduce the macro-voids to microvoids, wrapping the rope with sheet material, and severing the wrapped rope into filter units.
  • a method of making cylindrical tobacco smoke filter units which comprises mixing textile fibers of between about two and about five denier diameter and of random lengths in excess of .03 inch into a heterogeneous elongated roving having a diameter in excess of the diameter of the finished filter unit and having macro-voids between said fibers, radially compressing the roving into a rope having approximately the diameter of the finished filter unit to reduce the macro-voids to micro-voids, wrapping the rope with sheet material, and severing the wrapped rope into filter units.
  • a method of making cylindrical tobacco smoke filter units which comprises mixing textile fibers of a substantially uniform diameter between about two and about five denier and of random lengths to form a heterogeneous mass, gathering said mass into an elongated roving having a diameter in excess of the diameter of the finished filter unit and having macro-voids between the fibers, radially compressing the roving into a rope having approximately the diameter of the finished filter unit to reduce the macro-voids to micro-voids, Wrapping the rope with sheet material, and severing the wrapped rope into filter units.
  • a method of making cylindrical tobacco smoke filter units which comprises mixing textile fibers of a substantially uniform diameter between about two and about five denier and of random lengths with other fibers having a diameter up to about 3.0 microns to form a heterogeneous mass, gathering said mass into an elongated roving having a diameter in excess or" the diameter of the finished filter unit and having macro-voids between the fibers, radially compressing the roving into a rope having approximately the diameter of the finished filter unit to reduce the macro-voids to micro-voids, Wrapping the rope with sheet material, and severing the wrapped rope into filter units.

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  • Cigarettes, Filters, And Manufacturing Of Filters (AREA)
US367499A 1953-07-13 1953-07-13 Method of making a tobacco smoke filter Expired - Lifetime US3039908A (en)

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US367499A US3039908A (en) 1953-07-13 1953-07-13 Method of making a tobacco smoke filter
GB19501/54A GB752600A (en) 1953-07-13 1954-07-02 Improvements in or relating to filter units, particularly for tobacco smoke
CH320734D CH320734A (fr) 1953-07-13 1954-07-07 Filtre pour la fumée de tabac et procédé pour sa fabrication

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US3189506A (en) * 1962-04-12 1965-06-15 Eastman Kodak Co Method and apparatus for forming continuous filament filter rods
US3217715A (en) * 1965-05-24 1965-11-16 American Filtrona Corp Smoke filter and smoking devices formed therewith
US3219043A (en) * 1961-06-02 1965-11-23 Reeves Bros Inc Tobacco smoke filter plug
US3253967A (en) * 1962-12-18 1966-05-31 Du Pont Process for producing foam cigarette filters
US3268084A (en) * 1958-12-04 1966-08-23 Celanese Corp Bulked non-wovens
US3297512A (en) * 1962-12-26 1967-01-10 Eastman Kodak Co Apparatus for forming rods from continuous filament tow
US3297041A (en) * 1965-03-15 1967-01-10 American Filtrona Corp Tobacco smoke filter or the like
US3336174A (en) * 1965-04-06 1967-08-15 Eastman Kodak Co Method of making a fibrous filter product
US3349780A (en) * 1964-11-04 1967-10-31 Eastman Kodak Co Acetate filter elements containing carbon
US3359148A (en) * 1962-09-19 1967-12-19 Kurashiki Rayon Co Tobacco smoke filters and method of making the same
US3364938A (en) * 1963-12-19 1968-01-23 Eastman Kodak Co Tobacco smoke filter containing porous non-sifting polyolefin particles
US3396061A (en) * 1964-06-01 1968-08-06 Celanese Corp Smoke filters
US3400032A (en) * 1965-02-03 1968-09-03 Brown & Williamson Tobacco Filter rod making machine
US3400998A (en) * 1965-05-17 1968-09-10 Scripto Inc Fountain pen having a porous rod type nib
US3403202A (en) * 1964-04-20 1968-09-24 Brown & Williamson Tobacco Method and apparatus for making tobacco-smoke filters
US3407822A (en) * 1966-02-07 1968-10-29 Eastman Kodak Co Tobacco smoke filters containing polyethylene encapsulated cellulose particles
US3412737A (en) * 1966-01-17 1968-11-26 Karoly G. Pinter Smoke filter
US3417552A (en) * 1967-01-06 1968-12-24 Eastman Kodak Co Filter element made of polymeric film
US3418187A (en) * 1964-08-27 1968-12-24 Courtaulds Ltd Filter elements
US3432446A (en) * 1965-03-31 1969-03-11 Carter S Ink Co Porous applicator prepared by bonding thermoplastic fibrous flock particles at point of contact with the aid of a plasticizer
US3451887A (en) * 1963-03-22 1969-06-24 Eastman Kodak Co Blends of cellulose acetate and polyolefin fibers in tow form
US3463688A (en) * 1964-07-22 1969-08-26 Eastman Kodak Co Fibrous element
US3498299A (en) * 1969-01-10 1970-03-03 Bose Wesley C Filtration of tobacco smoke
US3516885A (en) * 1965-02-03 1970-06-23 Brown & Williamson Tobacco Method of making a bonded filter rod for smoking articles
US3516419A (en) * 1969-02-27 1970-06-23 John Kalsey Cigarette filter element
US3528433A (en) * 1968-03-21 1970-09-15 Philip Morris Inc Smoking product having microreticulated filter
US3648712A (en) * 1970-01-29 1972-03-14 Celanese Corp Cigarette filter construction
US3678848A (en) * 1969-08-25 1972-07-25 Weber Marking Systems Inc Inking pad and use thereof
US4160059A (en) * 1976-05-12 1979-07-03 Honshu Seishi Kabushiki Kaisha Adsorptive nonwoven fabric comprising fused fibers, non-fused fibers and absorptive material and method of making same
FR2462111A1 (fr) * 1979-07-26 1981-02-13 Job Ets Bardou Job Pauilhac Procede pour la realisation d'une structure filtrante, notamment pour filtres a cigarettes et filtres obtenus
US4579130A (en) * 1983-12-22 1986-04-01 Shell Oil Company Tobacco filters and method for producing same
US5053066A (en) * 1990-05-04 1991-10-01 Hassenboehler Charles B Nonwoven filter and method of manufacture
US5139403A (en) * 1991-03-25 1992-08-18 Replas Incorporated Apparatus for producing pellets from film
US5382153A (en) * 1990-08-25 1995-01-17 Hoechst Aktiengesellschaft Apparatus for producing filling material for three-dimensionally shaped textile structures
US5817159A (en) * 1996-12-31 1998-10-06 Cahill; Scott A. Filter with interpenetrating polymer network that biodegrades
EP1314364A1 (fr) * 2001-11-27 2003-05-28 Hauni Maschinenbau AG Dispositif pour la production d'articles en forme de tige
US20070277838A1 (en) * 2004-11-19 2007-12-06 Japan Tobacco Inc. Cigarette manufacturing apparatus
AT508818B1 (de) * 2009-09-30 2011-10-15 Tannpapier Gmbh Mundstückbelag oder filterhülle einer zigarette
WO2013043806A3 (fr) * 2011-09-23 2013-06-06 R. J. Reynolds Tobacco Company Produit à fibres mixtes pour l'utilisation dans la fabrication d'éléments de filtre de cigarette, et procédés, systèmes et appareils associés
US20150189914A1 (en) * 2012-05-25 2015-07-09 British American Tobacco (Investments) Limited Sleeve
US20160302475A1 (en) * 2013-12-11 2016-10-20 British American Tobacco (Investments) Limited A Method and Apparatus for Inserting Elongate Elements into a Sleeve
US20170020186A1 (en) * 2014-01-21 2017-01-26 British American Tobacco (Investments) Limited Filter materials and filters made therefrom
ITUA20163103A1 (it) * 2016-05-03 2017-11-03 Montrade S P A Macchina e procedimento per la fabbricazione in continuo di articoli da tabacco, in particolare filtri
EP3416734B1 (fr) 2016-02-19 2020-10-28 Baldwin Filters, Inc. Filtre à surface revêtue et procédé associé

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US3144025A (en) * 1960-04-25 1964-08-11 Reeves Bros Inc Tobacco smoke filters
US3358640A (en) * 1963-04-12 1967-12-19 Kurashiki Rayon Co Device for treating cigarette filter plugs

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US2159121A (en) * 1936-06-20 1939-05-23 American Mach & Foundry Filter tip for cigarettes
US2230271A (en) * 1937-05-22 1941-02-04 Owens Corning Fiberglass Corp Method of producing combined asbestos and glass fiber yarns
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US2357392A (en) * 1941-03-01 1944-09-05 Sylvania Ind Corp Process for producing fibrous products
US2527628A (en) * 1944-09-16 1950-10-31 American Viscose Corp Process for producing a matrix containing particulate fillers
US2476582A (en) * 1945-06-11 1949-07-19 Houdaille Hershey Corp Method of making filter units
GB665278A (en) * 1948-12-10 1952-01-23 British Celanese Improvements in or relating to cigarette filter tips

Cited By (57)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3268084A (en) * 1958-12-04 1966-08-23 Celanese Corp Bulked non-wovens
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CH320734A (fr) 1957-04-15

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