US3757649A - Smoke filters - Google Patents

Smoke filters Download PDF

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Publication number
US3757649A
US3757649A US00188874A US3757649DA US3757649A US 3757649 A US3757649 A US 3757649A US 00188874 A US00188874 A US 00188874A US 3757649D A US3757649D A US 3757649DA US 3757649 A US3757649 A US 3757649A
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US
United States
Prior art keywords
filter element
wrapper
web
continuous
filter
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
US00188874A
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English (en)
Inventor
F Labbe
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.)
Molins Machine Co Ltd
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Molins Machine Co Ltd
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 claimed from GB32625/69A external-priority patent/GB1299855A/en
Application filed by Molins Machine Co Ltd filed Critical Molins Machine Co Ltd
Application granted granted Critical
Publication of US3757649A publication Critical patent/US3757649A/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
    • A24D3/045—Tobacco smoke filters characterised by their shape or structure with smoke acceleration means, e.g. impact-filters

Definitions

  • This invention concerns improvements in or relating to smoke filters for cigarettes or other smokers articles such as cigars.
  • Such a filter may take the form of a cylindrical tubular wrapping containing a stub (e.g., of paper or of cellulose acetate fibres) at each end, with granular or powdered material occupying the space between the stubs.
  • a stub e.g., of paper or of cellulose acetate fibres
  • Such a filter is usually joined to one end of a cigarette by an encircling band.
  • loose material For convenience, granular, powered or like materials suitable for use in a filter will be called loose material.
  • a problem met with in connection with filters of this nature is the difficulty in ensuring that smoke drawn through the filter by the smoker passes through the loose material and does not by-pass it. Difficulty may .be encountered during manufacture of the filters in ensuring that the spaces between stubs are completely filled with loose material. Even if these difficulties are overcome and the spaces in newly made filters are well filled, it is not certain that they will remain equally well filled during the time that elapses until the filter cigarettes reach the customer.
  • the handling and transporting of the filters before they are combined with ciga-- rettes, theaction of the machinery by which they are combined with cigarettes, and the handling and transporting of the filter cigarettes, may all affect the distribution of the loose material (if this material is at all compressible) by causing it to become more compact, and the more compressible the loose material, the greater is the risk of undesired compacting which may result in gaps through which the smoke can pass instead of passing wholly through the loose filtering material.
  • the present invention is, according to one aspect, concerned with filters embodying loose materials.
  • the invention provides a filter for a cigarette or other smokers article wherein loose material is held in separate layers by porous elements arranged between the layers and so arranged that smoke passing from one end of the filter to. the other is constrained to pass across and through said layers in succession.
  • the invention further provides a filter for a cigarette or other smoker's article whereina tubular wrapper encloses a plug comprising a series of porous disc-like elements which hold between them separate layers of loose material and which are disposed in planes transverse to the axis of filter, so that smoke is constrained to pass across and through said layers while flowing axially of the filter.
  • the invention further provides a filter for a cigarette or like smokers article, incorporating loose material, in which the loose material is contained within a tubular chamber, and comprising a smoke inlet at one end of the chamber and a smoke outlet at the other end of the chamber, the outlet being radially displaced from the inlet so that smoke passing from the inlet to the outlet is constrained to flow in substantially radial directions through the loose material.
  • the invention further provides a filter for a cigarette or other smokers article in which a tubular wrapper encloses, a plug of porous paper or the like, folded or otherwise arranged to present a multitude of layers extending lengthwise of the filter and arranged substantially concentrically, the layers containing between them layers of loose material, and in which smoke passing from one end of the filter to the other is constrained to flow in a substantially radial direction, either outwardly or inwardlyjacross and through 'the'substan tially concentric layers in succession.
  • the filter can contain sealing members at opposite ends of the plug, one of which allows smoke to pass only through a central aperture which communicates with a central, axially extending channel in the plug, while the other sealing member allows smoke to pass only through an annular channel or channels at its periphery (e.g., between its periphery and the inner surface of the tubular-wrapper) communicating with one or more annular, axially extending, outer channels or spaces between the tubular wrapper and the outermost layer or layers of the plug.
  • sealing members at opposite ends of the plug, one of which allows smoke to pass only through a central aperture which communicates with a central, axially extending channel in the plug, while the other sealing member allows smoke to pass only through an annular channel or channels at its periphery (e.g., between its periphery and the inner surface of the tubular-wrapper) communicating with one or more annular, axially extending, outer channels or spaces between the tubular wrapper and the outermost layer or layers of the plug.
  • the present invention is also concerned with a rod making machine which can construct a filter having a non-axial filtering path.
  • apparatus for forming a continuous filter rod comprises means to form at least two axial passages through a filter rod and means to seal only one end of each passage to form a non-axial smoke path through the filter rod;
  • apparatus for manufacturing a continuous filter rod comprises:
  • means are provided for forming indentations in the said wrapper web, the indentations serving to locate the cylinder laterally in those positions where there is no seal to do this.
  • a method of manufacturing a continuous filter rod comprises the following steps:
  • a filter plug comprises the following elements in combination:
  • a plurality of concentric tubes of porous material are spaced apart radially from one another and finely divided filter material is located in their interstices;
  • a plurality of bands are located at each end of the tubes and each band is positioned in an interstice between two adjacent tubes to space the two tubes radially apart from one another;
  • a plug seals one end of the central bore running through the radially innermost tube
  • the outermost tube is enclosed in a tubular wrapper which at one end of the filter is spaced from the outermost tube by means which will allow the passage of smoke between the outermost tube and the outer wrapper and at the other end of the filter the space between the outermost tube and the outer wrapper is blocked by an annular seal.
  • FIG. I is a diagrammatic sectional view of a filter associated with a cigarette
  • FIG. 2 is a view, greatly enlarged, of a fragment of FIG. 1;
  • FIG. 3 shows a modification of the filter shown in FIG. 1;
  • FIG. 4 shows another form of filter
  • FIG. 5 is an enlarged fragmentary view of a filter similar to that shown in FIG. 1;
  • FIGS. 6 and 7 illustrate diagrammatically the method and apparatus for producing the filter shown in FIG. 5.
  • the filter shown abutted against the end of a cigarette portion 1 comprises a plug 2 consisting of porous paper or the like, folded, wound or otherwise arranged in a multitude of layers 3 (see FIG. 2) which extend lengthwise of the filter and are arranged substantially concentrically; layers of loose material 4 contained and held between the porous layers 3; sealing elements 5 and 6 at opposite ends of the plug; and end stub 7 which may be a conventional filter element, e.g., made of paper or cellulose acetate fibres; and a tubular wrapper 8 enclosing these components.
  • a plug 2 consisting of porous paper or the like, folded, wound or otherwise arranged in a multitude of layers 3 (see FIG. 2) which extend lengthwise of the filter and are arranged substantially concentrically; layers of loose material 4 contained and held between the porous layers 3; sealing elements 5 and 6 at opposite ends of the plug; and end stub 7 which may be a conventional filter element, e.g., made of paper or cellulose acetate fibres;
  • the plug 2 has a central axially extending channel 9, and there is an annular, axially extending channel or space 10 between the tubular wrapper 8 and the outermost layers of the plug.
  • These channels may be substantially hollow and empty, or may contain spacing elements such as axially extending ribs, or may contain porous material through which smoke can flow freely lengthwise of the filter.
  • the sealing elements Sand 6, shown for clarity in the drawing are of substantial thickness, can be relatively thin and of any material suitable for sealing the ends of the plug 2.
  • the element 5 has a central aperture 11 which communicates directly with the central channel 9 on the one hand, and with the interior of the cigarette portions, on the other hand.
  • the outer edge of the element 5 makes sealing contact with the tubular wrapper 8.
  • the element 6 is provided at its periphery with annularspaces or channels 12 communicating directly with the annular channel or space 10 on the one hand, and on the other hand with a chamber 13 between the element 6 and the end stub 7.
  • This construction ensures that substantially all the smoke drawn from the cigarette through the filter into the smokers mouth is constrained to flow across and through the layers 3 of porous material and the layers 4 of loose material held therebetween, in generally radial directions.
  • the directions followed by the smoke are indicated generally by the arrows in FIG. 1.
  • Smoke can enter the plug 2 only through the central aperture 1 1, and can leave it only through the spaces or channels 10.
  • the elements 5 and 6, with the tubular wrapper 8 define a tubular chamber containing loose material and through which smoke is constrained to-flow in substantially radial directions.
  • the pressure drop across the filter according to the invention can be reduced by increasing the length of the plug in which the loose material is held, since this increases the area of the surfaces across which the smoke can flow.
  • FIG. 3 shows a modified construction in which two plugs 2 are provided in series, separated by a sealing element 26 like the element 6 in FIG. 1, and with an element 25, like the element 5 in FIG. 1, at opposite ends.
  • the path of the smoke through this composite construction is indicated by arrows.
  • the central sealing element 26 could be replaced by an element 25 with a central aperture, the elements 25 shown at opposite ends being replaced by two elements like the element 26.
  • the porous paper or the like which forms the layers 3 can be corrugated, knurled, or otherwise roughened in order to assist in holding the loose material against displacement.
  • FIG. 4 shows another construction in accordance with the invention.
  • loose material 4 is held between discs 23 of porous material such as porous paper, which are corrugated, knurled or otherwise deformed so as to hold the loose material against displacement.
  • the discs 23 are disposed in an axially extending array between two conventional stubs 27 and the peripheral edges of the discs make sealing contact with the tubular wrapper 28.
  • FIG. 5 this shows a fragmentary length of a continuous filter rod constructed by the machine shown in FIG. 6.
  • the filter rod comprises an outer wrapper 101 of thin paper which surrounds a paper tube 102.
  • Concentric tubes of porous support paper 103 are immediately enclosed in a thin porous paper 109 and are contained within the wrapper 101 and tube 102.
  • the concentric porous paper tubes support finely divided filter material in their interstices.
  • An axial bore 104 runs through the concentric tubes of porous paper 103.
  • the porous paper tubes 103 carry an annulus of concentric rings of thick paper 105.
  • Alternate concentric rings of paper 105 have a band of soft paper 106 located between the outermost ring and the tube 102.
  • the other alternate concentric rings of paper 105 have their outermost ring contacted by dimples 107 formed in the tube 102 in order to locate those alternate concentric rings of paper 105 against lateral movement.
  • These same rings have a stub 108 of nonporous material contained within their innermost memher, the stub 108 blocking the axial passage 104.
  • the continuous rod of which the portion illustrated in FIG. 5 forms a part, is cut through each annulus of concentric rings 105 at their mid points as shown by the chain dotted lines AA.
  • a filter plug thus formed will have a smoke passage illustrated by the arrowed path; the directions of the arrows could of course be reversed.
  • FIG. 6 Apparatus for producing a filter rod constructed in accordance with FIG. 5 will now be described with reference to FIG. 6 in which the same reference numerals have been used to denote those parts of the apparatus which form or supply corresponding elements in the continuous filter rod shown in FIG. 5.
  • the upstream side of the apparatus is to the right of FIG. 6 and the downstream side to the left.
  • a web of porous support paper 103 is fed into the machine at its extreme upstream end.
  • Onto the underside of the web of porous support paper 103 are stuck nonporous stubs 108 at intervals equal to two filter plugs lengths and on the upperside of the web 103 are stuck strips of thick paper 105 at intervals equal to one filter plug length, alternate strips 105 being in register with a stub 108, as shown in FIG. 7.
  • the strips 105 and stubs are held on the web 103 by an adhesive.
  • the means to secure the strips 105 and stubs 108 on the web 103 at the regular intervals referred to is illustrated schematically at 110 and 111.
  • the web 103 then passes beneath a hopper 113 which operates to deposit finely divided, e.g., powdered or granular, filter material onto the web.
  • the web 103 thus loaded with filter material, then passes through slitting apparatus 114 which cuts the web 103 longitudinally into six strips which have graduated widths suitable for forming the six concentric tubes 103 shown in FIG. 5.
  • the slit web 103 then passes through apparatus 115 which is designed to stack the six slit wets one on top of the other, the narrowest web of the six being on the top of the stack.
  • a web of thin porous paper 109 is then introduced beneath the stackof slit webs 103 and the paper 109 and webs 103 then pass through a paster 116 which deposits a line of paste along one edge of the thin porous paper web 109, and then into a folder 117 which forms the stack of porous paper 103 and the porous web 109 into a rod, the line of paste along the paper 109 then being heated by a heater 118 to seal the paper 109 around the slit webs 103.
  • the rod so formed is then enclosed in a stiff paper tube 102, with bands of soft paper 106 enclosing one alternate series of thick paper annulii 105 and the other alternate series of annulii 105 being gripped by dimpled portions 107 of the thick paper tube 102.
  • These operations are effected by taking a web of thick paper 102 from a reel and passing it through a tipping apparatus 119.
  • the tipping apparatus 119 is supplied with a strip of porous paper 106 which is then cut into strips by the tipping apparatus 119 and deposited on the web 102 and held there by adhesive.
  • the web 102 passes through two contra-rotating wheels 120 which are formed with projections on their periphery at predetermined spaced circumferential intervals so as to form the dimples 107 at lengths along the web 102 equal to two filter plug lengths as the web 102 passes between the wheels 120.
  • the web 102 then passes beneath the rod emanating from the heater 118 and the two then pass into a second combination of paster 121, folder 122 and heater 123 which operate to enclose the rod emanating from the previous heater 118 in the stiff paper 102 and also in a final outer wrapper 101 of thin paper, the wrapper 101 being stuck to itself along one of its edges to form the finished filter rod shown in FIG. 5.
  • the above described apparatus is designed for forming a filter which employs finely divided filtering material which it is essential to support against being unduly compressed for example as a result of the air drawn through the filter by the smoker.
  • finely divided material will normally compress to such a degree, under the draw, as to cause it to have an unacceptable pressure drop across it and thus make the cigarette unsmokable.
  • a series of concentric fine porous tubes 103 which are spaced apart from one another by the annulii 105 a plurality of annular containers is in effect provided for the finely divided filtering material.
  • Apparatus for making cigarette filters comprising means for forming a continuous tubular filter element; means for feeding a continuous wrapper web towards the tubular filter element; means for securing spacer strips at regular intervals across the wrapper web as it approaches the tubular filter element; means for wrapping the wrapper web around the filter element, whereby the spacer strips space the wrapper web from the tubular filter element to form an annular space between the filter element and the surrounding wrapper; and means for cutting the continuous wrapped tubular filter element at regular intervals into sections each comprising at least one filter element unit surrounded by a section of wrapper web spaced from the filter element unit to define therewith an annular space, one end of which is closed by at least a part of one of the spacer strips; and including means for closing the bore of the tubular filter element unit at the end remote from the end of the annular space closed by the spacer strip.
  • Apparatus according to claim 1 including means for forming depressions in the continuous wrapper web as it approaches the tubular filter element, whereby the depressions space the wrapper web from the tubular filter element at regions remote from the spacer strips.
  • Apparatus according to claim 1 in which the means for forming a continuous tubular filter element comprise means for bending into tubular formation a laminate comprising at least one layer of particulate filter material sandwiched between webs of porous sheet material.
  • Apparatus for manufacturing a continuous filter rod comprising the following features in combination:
  • c. means to cut the porous web longitudinally into a plurality of strips
  • Apparatus as claimed in claim 4 in which means are provided for forming indentations in the said wrapper web, the indentations serving to locate the cylinder laterally in those positions where there is no seal to do this.

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  • Cigarettes, Filters, And Manufacturing Of Filters (AREA)
US00188874A 1968-12-04 1971-10-13 Smoke filters Expired - Lifetime US3757649A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB5770368 1968-12-04
GB32625/69A GB1299855A (en) 1968-12-04 1968-12-04 Improvements in or relating to tobacco smoke filters

Publications (1)

Publication Number Publication Date
US3757649A true US3757649A (en) 1973-09-11

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ID=26261478

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Application Number Title Priority Date Filing Date
US00188874A Expired - Lifetime US3757649A (en) 1968-12-04 1971-10-13 Smoke filters

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US (1) US3757649A (enrdf_load_stackoverflow)
JP (1) JPS4841557B1 (enrdf_load_stackoverflow)
CH (1) CH505568A (enrdf_load_stackoverflow)
DE (1) DE1960654A1 (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3854384A (en) * 1971-05-24 1974-12-17 Brown & Williamson Tobacco Method of making tobacco smoke filters
US4036119A (en) * 1971-07-26 1977-07-19 Hauni-Werke Korber & Co., Kg Method and machine for the production of composite filter mouthpieces

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4026306A (en) * 1975-11-06 1977-05-31 American Filtrona Corporation Tobacco smoke filter
JPH0418522U (enrdf_load_stackoverflow) * 1990-06-07 1992-02-17
DE202012103319U1 (de) 2012-08-31 2012-10-11 Lehmann Tabak - Logistik - Fulfillment UG (haftungsbeschränkt) Filtervorrichtung, Rauchmittel, deren Verwendung und System hierzu

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2164702A (en) * 1936-02-29 1939-07-04 Davidson Glenn Method and apparatus for making cigarette mouthpieces
US3473539A (en) * 1965-02-03 1969-10-21 Brown & Williamson Tobacco Bonded filter rod for smoking articles
US3646855A (en) * 1957-01-22 1972-03-07 Celfil Co Method and apparatus for producing a tobacco filter rod or cord from a web of fibrous material

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2164702A (en) * 1936-02-29 1939-07-04 Davidson Glenn Method and apparatus for making cigarette mouthpieces
US3646855A (en) * 1957-01-22 1972-03-07 Celfil Co Method and apparatus for producing a tobacco filter rod or cord from a web of fibrous material
US3473539A (en) * 1965-02-03 1969-10-21 Brown & Williamson Tobacco Bonded filter rod for smoking articles

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3854384A (en) * 1971-05-24 1974-12-17 Brown & Williamson Tobacco Method of making tobacco smoke filters
US4036119A (en) * 1971-07-26 1977-07-19 Hauni-Werke Korber & Co., Kg Method and machine for the production of composite filter mouthpieces

Also Published As

Publication number Publication date
CH505568A (fr) 1971-04-15
DE1960654A1 (de) 1970-10-01
JPS4841557B1 (enrdf_load_stackoverflow) 1973-12-07

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