US2931364A - Rod-shaped filter element - Google Patents

Rod-shaped filter element Download PDF

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Publication number
US2931364A
US2931364A US698251A US69825157A US2931364A US 2931364 A US2931364 A US 2931364A US 698251 A US698251 A US 698251A US 69825157 A US69825157 A US 69825157A US 2931364 A US2931364 A US 2931364A
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US
United States
Prior art keywords
strips
filter
smoke
vortical
tobacco
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
US698251A
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English (en)
Inventor
Mueller Paul Adolf
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.)
Individual
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Individual
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 NL95124D priority Critical patent/NL95124C/xx
Priority to NL202429D priority patent/NL202429A/xx
Priority to BE544701D priority patent/BE544701A/xx
Priority to CH330812D priority patent/CH330812A/de
Priority to US502085A priority patent/US2820461A/en
Priority claimed from US502085A external-priority patent/US2820461A/en
Priority to GB13240/55A priority patent/GB803472A/en
Priority to DEM28807A priority patent/DE1090145B/de
Priority to FR1180617D priority patent/FR1180617A/fr
Application filed by Individual filed Critical Individual
Priority to US698251A priority patent/US2931364A/en
Application granted granted Critical
Publication of US2931364A publication Critical patent/US2931364A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
    • A24D3/04—Tobacco smoke filters characterised by their shape or structure

Definitions

  • NYE 2 m 9 72 .g LL 1.
  • the present invention relates to the continuous production of tobacco filters, particularly for use in cigarettes.
  • the filters used at present for cigarettes consist of a multi-layer or crimped paper web, e.g. multi-layer crimped tissue paper, crimped cellulose wedding, rolled together in longitudinal direction of the filter, with or without intermediate layers of adsorptive materials, e.g., thin strips of wadding inserted between the separate layers of paper.
  • the disadvantages of such filters is that they have pronounced longitudinal ducts through which the smoke can pass unhindered, i.e., unfiltered.
  • the suggestion has already been made to arrange a ball of Wadding in front of such a filter at the tobacco side, which ball has the task of absorbing the mentioned harmful substances so that the actual filter which follows has only a subordinate importance.
  • even such a combined filter is no solution for the problem, apart from the fact that its production is complicated and therefore expensive.
  • activated carbon does not have this drawback, but it fails in practice because it is not possible to mix activated carbon with the cigarette tobacco or, for instance, thewadding. or to press activated carbon together with the wadding to form a filter, as no method of binding it nite States Patent F 2,931,364 Patented Apr. 5, 1960 to a carrier so that it will resist rubbing, has yet been found.
  • the filtering action i.e. the separation of nicotine, tar products and other harmful constituents of the smoke, depends mainly on the surfaces brushed or contacted by the smoke during its passage through the filter.
  • the present invention aims at producing smoke filtering members Whose efiective total surface is greater than that of all paper and fibre strand filters known hitherto, without, however, the tensile resistance, with filters made of paper, being inadmissibly high, while with filters made from fibre strands the tensile resistance can be reduced without the necessity of strengthening the fibrous framework by the addition of binding agents.
  • the present invention contemplates a tobacco filter particularly suitable for cigarettes, and provides means contributing to a filtering member which contains at least a few elongated vortical and condensation strips which are made of a flexible flat material and in which at least one side or elongated surface is provided with'irregularities so as to enlarge the surface area.
  • Fig. 1 shows the principle of the invention according to which filter strips are arranged, and illustrates the same diagrammatically (the materials located between the strips being omitted);
  • Figs. 2 to 8 are each a plan view of a typical embodiment of a vortical and condensation strip
  • Fig. 9 is a cross-section through vortical and condensation strip.
  • the surface contacted by the smoke as it flows through the smoking article must necessarily be larger than in the case of a vertical filter which consists of strips of a material which are similar'but not provided with surfaceirregularities.
  • These irregularities in particular, if they have a sharp-edged or frayed structure, provide, moreover, a plurality of obstacles in the flow path of the smoke, which obstacles result in labyrinthine paths offlow and produce a plurality of randomly distributed vortex centres in the flow of the smoke. In this way the separation of solid and liquid particles from the tobacco smoke is substantially increased.
  • a filter constructed of fibrous materials together with vortical and condensation strips the latter, particularly if theyconsist of relatively strong material such as blotting paper or metal foils, also contribute substantially to the strengthening of the filten.
  • the suitablefibrous materials can then be chosen without regard to their strength and only with regard to the best filtering effect, which has not previously been possible, and the requisite strength of the filter can be ensured by means of a suitable frameworkof vortical and condensation strips.
  • the rigid framework made of such vortical and con-. densation strips which contribute quite substantially toward a good filtering effect also enables, however, fibrous materials to be replaced or supplemented by other absorbent materials, such as plastic foam flakes, sponge flakes, viscose foam, etc., the use of which has hitherto led to difficulties owing to their strength being'as a rule inadequate.
  • Fig; 1 The basic arrangement of a preferred type vortical or twisted strips inside a filter is shown diagrammatically in Fig; 1.
  • the outer sheath 1 which consists, for iiistance, of tissue paper (shown in dotand' dash lines)
  • the filter preferably constituting an endless, elongated rod formation from which the individual filter plugs are cut ofi to the desired length.
  • the strips 2 may form endless webs which extend along the filter sheath 1 and are combined to form an elongated bundle of strips which are in a randomly chosen position in relation to each other.
  • Figs. 2 and 3 show round andoblong holes or rents 9 and 10, respectively, in a vortical and condensation strip 2.
  • the lateral indentations may also have a rounded or randomly frayed configuration 11 or 12, as shown in Figs. 4 and amp instance, absorbent paper or stiffened fleece made from natural or synthetic fibres.
  • strips of woven fabric, as well as those made of foil-like, heatresistant, tasteless and odorless plastics Compressed plastic foam, with and without surface coating, can be used provided it meets the hygienic requirements. If particular importance is attached to a good condensation effect, it is'advisable to use a flat material which has on at least one side a metallic surface whichmay be compact or disconnected.
  • paper metallized on one or both sides can be used for this purpose,
  • Filters according to the present invention may, for instance, contain exclusively vortical and condensation strips of the type described.
  • the fibrous material 20 indicated in Fig. l which is bydrophylic may be'of natural origin, such as cellulose fibres, cotton wadding, etc;, or of synthetic origin, such as rayon, acetate viscose fibres.
  • the multi-layer strip formation may be covered with fibres and perforated to result in filters which have a larger content of strips and a smaller content of fibrous material (see Fig. 1) than other filters.
  • randomly distributed flakes of sponge or foamlike material can also be provided in the filter inside the vortical and condensation strips.
  • plastic foam'having hollow spaces which intercommunicate at least in part and are made, for instance, of carbamide resin.
  • Foam or sponge-like compomds made from viscose lamellae, latex foam, neoprene foam, etc., are also suitable.
  • a filter for a tobacco smoking article which consists of a rod-shaped filter element provided with a plurality of strips, each strip being substantially coextensive in length with that of said rod-shaped filter element and being slightly twisted aboutv its axis and about adjacent strips, said strips being haphazardly arranged in elongated bundle formation and consisting at least partly of flexible absorbent material.
  • Each strip possesses a surface configuration, which is worked upon, preshaped or distended to thereby enlarge the filtering surface area.
  • Hydrophilic cellulose fibers of relatively small dimensions miy be interspersed betweensaid strips in random fashion to thereby provide a tortuous path for the smoke to follow when travelling through said filter element, said filter element having a sheath surrounding and maintaining said filter element in its rod-shaped form.
  • a tobacco filter comprising a rod-shaped filter element including a plurality of strips of fibrous sheet material arranged in elongated bundle formation, each of said strips having a longitudinal axis, being substantially coextensive in length with that of said filter element and being at least slightly twisted about the longitudinal axis and about adjacent strips, said strips being made of at least partially flexible absorbent material with at least one surface preshaped so as to present an irregular surface area to tobacco smoke, which surface area is relatively larger than that of a perfectly smooth surface area, at least some of said strips being provided with at least one frayed lateral edge and with rents disposed longitudinally of the respective strips.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Materials (AREA)
  • Cigarettes, Filters, And Manufacturing Of Filters (AREA)
US698251A 1955-02-11 1957-11-22 Rod-shaped filter element Expired - Lifetime US2931364A (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
NL202429D NL202429A (en)) 1955-02-11
BE544701D BE544701A (en)) 1955-02-11
NL95124D NL95124C (en)) 1955-02-11
CH330812D CH330812A (de) 1955-02-11 1955-02-11 Rauchwarenfilter
US502085A US2820461A (en) 1955-02-11 1955-04-18 Tobacco filter, particularly for cigarettes
GB13240/55A GB803472A (en) 1955-02-11 1955-05-06 Tobacco smoke filter, particularly for cigarettes
DEM28807A DE1090145B (de) 1955-02-11 1955-11-15 Tabakwarenfilter, insbesondere Zigarettenfilter
FR1180617D FR1180617A (fr) 1955-02-11 1956-01-24 Filtre d'articles à fumer, notamment de cigarettes
US698251A US2931364A (en) 1955-02-11 1957-11-22 Rod-shaped filter element

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH803472X 1955-02-11
US502085A US2820461A (en) 1955-02-11 1955-04-18 Tobacco filter, particularly for cigarettes
US698251A US2931364A (en) 1955-02-11 1957-11-22 Rod-shaped filter element

Publications (1)

Publication Number Publication Date
US2931364A true US2931364A (en) 1960-04-05

Family

ID=32397341

Family Applications (1)

Application Number Title Priority Date Filing Date
US698251A Expired - Lifetime US2931364A (en) 1955-02-11 1957-11-22 Rod-shaped filter element

Country Status (6)

Country Link
US (1) US2931364A (en))
BE (1) BE544701A (en))
CH (1) CH330812A (en))
FR (1) FR1180617A (en))
GB (1) GB803472A (en))
NL (2) NL95124C (en))

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3188924A (en) * 1960-01-12 1965-06-15 Cigarette Components Ltd Method and apparatus for the manufacture of smoke filters
US3336174A (en) * 1965-04-06 1967-08-15 Eastman Kodak Co Method of making a fibrous filter product
EP0246107A3 (en) * 1986-05-14 1989-08-02 R.J. Reynolds Tobacco Company Cigarette rods and filters containing strands provided from sheet-like materials
US5896860A (en) * 1997-12-03 1999-04-27 Lockett; Wilson Ira Smoking filter
WO2025088014A1 (en) * 2023-10-26 2025-05-01 Philip Morris Products S.A. A method for forming a filter element by twisting
WO2025088016A1 (en) * 2023-10-26 2025-05-01 Philip Morris Products S.A. Filter element for an aerosol-generating article comprising two porous materials

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1190379B (de) * 1959-03-02 1965-04-01 Schickedanz Ver Papierwerk Tabakrauchfilter aus einem versteiften Faservlies
DE1532229B1 (de) * 1964-06-22 1972-02-03 Tobacco Res And Dev I Ltd Filterelement fuer Tabakrauch

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE177423C (en)) *
US269256A (en) * 1882-12-19 Cigarette
GB380041A (en) * 1931-03-06 1932-09-06 Abraham Wix Improvements in or relating to cigarettes
US2033867A (en) * 1935-08-27 1936-03-10 Hyman R Segal Filter for pipes and cigar or cigarette holders
US2064239A (en) * 1928-11-20 1936-12-15 Aivaz Boris Smoke filter plug or wad for cigarette paper tubes
US2195201A (en) * 1938-08-13 1940-03-26 Harris M Humason Smoker's article
US2202839A (en) * 1936-05-04 1940-06-04 Davidson Glenn Cigarette mouthpiece
GB639919A (en) * 1948-03-25 1950-07-05 Hugo Bunzl Improvements in and relating to smoke filter wads
US2612966A (en) * 1950-03-29 1952-10-07 Wingfoot Corp Polyethylene air filter
CH288717A (de) * 1951-05-01 1953-02-15 Mueller Paul A Rauchfilter für Tabakwaren und Verfahren zu seiner Herstellung.
US2801638A (en) * 1954-05-11 1957-08-06 American Tobacco Co Filter tip for tobacco products
US2820461A (en) * 1955-02-11 1958-01-21 Muller Paul Adolf Tobacco filter, particularly for cigarettes

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE177423C (en)) *
US269256A (en) * 1882-12-19 Cigarette
US2064239A (en) * 1928-11-20 1936-12-15 Aivaz Boris Smoke filter plug or wad for cigarette paper tubes
GB380041A (en) * 1931-03-06 1932-09-06 Abraham Wix Improvements in or relating to cigarettes
US2033867A (en) * 1935-08-27 1936-03-10 Hyman R Segal Filter for pipes and cigar or cigarette holders
US2202839A (en) * 1936-05-04 1940-06-04 Davidson Glenn Cigarette mouthpiece
US2195201A (en) * 1938-08-13 1940-03-26 Harris M Humason Smoker's article
GB639919A (en) * 1948-03-25 1950-07-05 Hugo Bunzl Improvements in and relating to smoke filter wads
US2612966A (en) * 1950-03-29 1952-10-07 Wingfoot Corp Polyethylene air filter
CH288717A (de) * 1951-05-01 1953-02-15 Mueller Paul A Rauchfilter für Tabakwaren und Verfahren zu seiner Herstellung.
US2801638A (en) * 1954-05-11 1957-08-06 American Tobacco Co Filter tip for tobacco products
US2820461A (en) * 1955-02-11 1958-01-21 Muller Paul Adolf Tobacco filter, particularly for cigarettes

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3188924A (en) * 1960-01-12 1965-06-15 Cigarette Components Ltd Method and apparatus for the manufacture of smoke filters
US3336174A (en) * 1965-04-06 1967-08-15 Eastman Kodak Co Method of making a fibrous filter product
EP0246107A3 (en) * 1986-05-14 1989-08-02 R.J. Reynolds Tobacco Company Cigarette rods and filters containing strands provided from sheet-like materials
US5896860A (en) * 1997-12-03 1999-04-27 Lockett; Wilson Ira Smoking filter
WO2025088014A1 (en) * 2023-10-26 2025-05-01 Philip Morris Products S.A. A method for forming a filter element by twisting
WO2025088016A1 (en) * 2023-10-26 2025-05-01 Philip Morris Products S.A. Filter element for an aerosol-generating article comprising two porous materials

Also Published As

Publication number Publication date
BE544701A (en))
NL202429A (en))
FR1180617A (fr) 1959-06-08
NL95124C (en))
GB803472A (en) 1958-10-29
CH330812A (de) 1958-06-30

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