EP2247206B1 - Tobacco smoke filter - Google Patents

Tobacco smoke filter Download PDF

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Publication number
EP2247206B1
EP2247206B1 EP09703354A EP09703354A EP2247206B1 EP 2247206 B1 EP2247206 B1 EP 2247206B1 EP 09703354 A EP09703354 A EP 09703354A EP 09703354 A EP09703354 A EP 09703354A EP 2247206 B1 EP2247206 B1 EP 2247206B1
Authority
EP
European Patent Office
Prior art keywords
filter
tobacco smoke
element according
filter element
staple fibres
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.)
Revoked
Application number
EP09703354A
Other languages
German (de)
French (fr)
Other versions
EP2247206A2 (en
Inventor
Paul Francis Clarke
Daniel S. Araujo
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.)
Filtrona Filter Products Development Co Pte Ltd
Original Assignee
Filtrona Filter Products Development Co Pte Ltd
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Priority claimed from GB0801246A external-priority patent/GB0801246D0/en
Priority claimed from GB0822366A external-priority patent/GB0822366D0/en
Application filed by Filtrona Filter Products Development Co Pte Ltd filed Critical Filtrona Filter Products Development Co Pte Ltd
Priority to PL09703354T priority Critical patent/PL2247206T3/en
Publication of EP2247206A2 publication Critical patent/EP2247206A2/en
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Publication of EP2247206B1 publication Critical patent/EP2247206B1/en
Revoked legal-status Critical Current
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    • AHUMAN NECESSITIES
    • A24TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24DCIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D3/00Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
    • A24D3/06Use of materials for tobacco smoke filters
    • A24D3/062Use of materials for tobacco smoke filters characterised by structural features
    • A24D3/063Use of materials for tobacco smoke filters characterised by structural features of the fibers
    • AHUMAN NECESSITIES
    • A24TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24DCIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D3/00Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
    • A24D3/02Manufacture of tobacco smoke filters
    • A24D3/0204Preliminary operations before the filter rod forming process, e.g. crimping, blooming
    • A24D3/0208Cutting filter materials
    • AHUMAN NECESSITIES
    • A24TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24DCIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D3/00Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
    • A24D3/04Tobacco smoke filters characterised by their shape or structure
    • AHUMAN NECESSITIES
    • A24TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24DCIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D3/00Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
    • A24D3/06Use of materials for tobacco smoke filters
    • A24D3/08Use of materials for tobacco smoke filters of organic materials as carrier or major constituent
    • A24D3/10Use of materials for tobacco smoke filters of organic materials as carrier or major constituent of cellulose or cellulose derivatives

Definitions

  • the present invention relates to filters and filter elements for smoking articles such as cigarettes, in particular slim cigarettes.
  • Selective filtration occurs when the yield of selected chemicals in cigarette smoke is proportionally reduced to a greater extent than the majority of compounds in smoke (e.g. tar).
  • Phenolic compounds for example phenol, cresols, catechol and resorcinol - are known constituents of cigarette smoke. They are toxic compounds - in particular, phenol and catechol are included on the so-called "Hoffmann" list of the most hazardous compounds found in cigarette smoke. It is considered desirable to potentially selectively reduce the quantities of these compounds delivered to the smoker.
  • the usual filtering material used in cigarette filters is a continuous tow of filamentary cellulose acetate plasticised with triacetin, which is gathered together in rod form to form the filter or filter element.
  • the filaments of cellulose acetate tow are predominantly aligned in the longitudinal direction.
  • cellulose acetate exhibits a selective filtering action towards phenolic compounds.
  • a filter for a "slim" cigarette will naturally include a reduced volume of cellulose acetate filtering material compared to a standard filter; any selective filtering effect may be reduced as there is less material available to act upon a similar quantity of smoke. It is desirable, therefore, to provide a slim filter which potentially selectively reduces the quantities of phenolic compounds delivered to the smoker of a slim cigarette.
  • a filter tow is described in terms of the denier per filament (dpf); total denier; and the fibre cross-sectional shape.
  • the filament denier is defined as the weight in grams of 9000 metres of a single filament; the total denier is then simply the dpf multiplied by the number of filaments in the tow.
  • a 5Y30,000 tow describes a material with a filament with a dpf of 5 grams per 9000 metres in the shape of a Y, comprising 6,000 filaments giving a total denier of 30,000 grams per 9000 metre length.
  • a standard cellulose acetate (“monoacetate”) cigarette filter having a low circumference i.e.
  • a slim monoacetate filter it is necessary to use a cellulose acetate tow with a low total denier because there are limitations on the amount of material than can be packed into the slim product. It is well known in the industry that low total denier tows are more expensive (per unit weight) than higher total denier tows and there is also limited commercial availability of low total denier tows. It is desirable, therefore, to provide a slim filter, which can be made from a wider range of total denier of cellulose acetate tows than conventional slim or superslim monoacetate filters.
  • a tobacco smoke filter or filter element comprising a cylindrical plug of a substantially homogeneous filtering material of circumference between 14.0 and 23.2 mm (for example, between 16 and 23.2 mm), wherein the substantially homogeneous filtering material comprises a plurality of randomly oriented staple fibres.
  • substantially homogeneous filtering material means a filtering material which has substantially uniform physical characteristics throughout any cross-section therethrough.
  • the staple fibres means individual, discrete, fibres of specific length.
  • the staple fibres may be randomly oriented with reference to one another.
  • the substantially homogeneous filtering material may comprise a plurality of randomly oriented staple fibres wherein a portion of the randomly oriented staple fibres generally extend transversely to the longitudinal axis of the cylindrical plug.
  • the substantially homogeneous filtering material may comprise a plurality of randomly oriented staple fibres at least 10% (for example, 20%, 30%, 40%, 50%, 60%, 70%, 80% or 90%) of which by weight extend substantially transversely to the longitudinal axis of the cylindrical plug.
  • randomly oriented staple fibres means that the staple fibres are randomly oriented in three dimensions (in the filter or filter element).
  • the term randomly oriented staple fibres, herein, is not intended to (and does not) mean a continuous cellulose acetate tow, the individual strands of which are predominantly aligned in the longitudinal direction (although it will be appreciated that staple fibres may be formed from such tows, as discussed below).
  • the term randomly oriented staple fibres, herein, is not intended to (and does not) mean a web or sheet of filtering material which is formed (from e.g. pulp and/or fibres) and then shaped as a whole or substantially whole web or sheet into rod form (by e.g. wrapping).
  • randomly oriented staple fibres does not mean a two dimensional paper-like artefact which is taken up in a roll form.
  • the term randomly oriented staple fibres, herein, is not intended to (and does not) mean a web or sheet of filtering material which is formed (from e.g. pulp and/or fibres) and then shredded and then shaped into rod form. Sheets or webs may have random orientation in two dimensions but (even when shredded) undergo processes (such as embossing) so they retain some integrity when drawn through a filter making machine.
  • the fibres in a filter or filter element made from a sheet or web will be predominantly aligned along the longitudinal axis of the filter or filter element, and are therefore not randomly oriented (in three dimensions) staple fibres.
  • the plurality of randomly oriented staple fibres may form a porous matrix providing a labyrinth of passages - these may act as passages for smoke when utilised as a cigarette filter.
  • the applicants have found that the performance of the filter or filter element of the invention may be comparable to existing products (e.g. a "monoacetate" product formed of a continuous tow of longitudinally oriented filaments of cellulose acetate tow plasticised with triacetin gathered together in rod form), but the applicants have found that 20-30% less filtering material (e.g. cellulose acetate) is required when it is used in the form of randomly oriented staple fibres.
  • tobacco smoke filters or filter elements of the invention may provide enhanced removal of phenols from tobacco smoke (in a slim cigarette), compared to e.g. a standard monoacetate filter or filter element (which does not comprise randomly oriented staple fibres).
  • a standard monoacetate filter or filter element which does not comprise randomly oriented staple fibres.
  • the unexpected reduction in phenolic compounds by filters and filter elements of the invention is even more significant when the lower weight of filtering material (cellulose acetate) is taken into account.
  • tobacco smoke filter or filter elements of the invention may be more readily and swiftly degraded under e.g. environmental conditions, compared to e.g. a standard monoacetate filter or filter element.
  • the staple fibres may be made of filamentary material.
  • the staple fibres may be crimped, as is well known in the art.
  • the staple fibres may be, for example, cellulose acetate or polypropylene fibres.
  • the staple fibres may be made of (or formed from) a fibre tow, for example cellulose acetate tow, polypropylene tow.
  • the staple fibres may be, for example, natural and/or synthetic fibres; fibres formed from natural plant material(s) etc.
  • the staple fibres may be cellulose pulp fibres (e.g. which have been fiberized via a hammermill).
  • the staple fibres may be cut herbs (e.g. cut tobacco leaf), or obtained from reconstituted tobacco sheet.
  • the staple fibres may impart flavouring and/or filtration properties to the final product.
  • the staple fibres may be of substantially the same length (of substantially uniform length).
  • the staple fibres may be of a variety of different lengths.
  • the stable fibres may be for example of length between 4 mm and 20 mm, e.g. between 5 mm and 19 mm, e.g. between 6 mm and 18 mm, e.g. between 7 mm and 16 mm.
  • the staple fibres may be made of, or formed from, a fibre tow, for example cellulose acetate tow, of total denier of from 14,000g to 55,000g per 9,000m length, e.g. from 20,000g to 50,000g per 9,000m length, e.g. from 23,000g to 45,000g per 9,000m length, e.g. from 25,000g to 40,000g per 9,000m length.
  • the substantially homogeneous filtering material may optionally include other material, for example a liquid additive (such as a flavourant, e.g. menthol solution).
  • a liquid additive such as a flavourant, e.g. menthol solution.
  • the substantially homogeneous filtering material comprising a plurality of randomly oriented staple fibres may be formed from a plurality of staple fibres, and may optionally include other material, for example a plasticiser, a binder material or other additive.
  • the staple fibres may be bonded to each other (e.g. due to action of a plasticiser) at a multiplicity of contact points.
  • the substantially homogeneous filtering material may optionally include a binder material.
  • the substantially homogeneous filtering material may optionally include a water soluble binder material.
  • water soluble materials include water soluble polymer materials such as polyvinyl alcohol, polyvinyl pyrrolidone, polyvinyl ether, starches, polyethylene glycols and polypropylene glycols; blends of water soluble binders with plasticisers such as triacetin; and hot melt water soluble binders in particulate form.
  • the inclusion of a water soluble binder material may further enhance the ability of the filter or filter element to be readily and swiftly degraded e.g. under environmental conditions.
  • the filter or filter element may include one or more particulate additives - e.g. within the body of the filter or filter element.
  • the (or each) particulate additive may be a powder (e.g. particles of 50 to 150 ⁇ m diameter) or granular (e.g. particles of 0.15 to 1.0 mm diameter).
  • suitable particulate additives include flavourants or sorbents - e.g. activated carbon, zeolite, ion exchange resin (e.g. a weakly basic anion exchange resin), sepiolite, silica gel, alumina, molecular sieves, carbonaceous polymer resins and diatomaceous earths.
  • the filter or filter element may include more than one type of staple fibre.
  • staple fibres which are fibres (of e.g. cellulose pulp) which have been fiberized via a hammermill may be included in the filter in addition to (e.g. mixed with) staple fibres formed from a filamentary tow.
  • the staple fibres may be plasticised.
  • the substantially homogeneous filtering material may optionally include a plasticiser.
  • the formation of plasticised tow is well known in the art.
  • the plasticiser (which plasticises the staple fibres) may be, for example, triacetin, triethyleneglycol diacetate (TEGDA) or polyethylene glycol (PEG).
  • the staple fibres may be fibres of plasticised cellulose acetate tow.
  • the staple fibres may be cellulose acetate tow which has been plasticised with e.g. triacetin.
  • the circumference of the cylindrical plug may be for example between 14.0 mm and 23.2 mm, for example between 16 and 23.2 mm, for example between 16.0 mm and 20mm, for example between 16.2mm and 20mm, for example between 16.2 mm and 17 mm.
  • the plurality of randomly oriented staple fibres may form a porous matrix providing a labyrinth of passages in the filtering material.
  • the labyrinth passages may function as passages for smoke when utilised as a cigarette filter.
  • the tobacco smoke filter or filter element may have substantially uniform physical characteristics throughout any cross-section thereof, rather than the more uneven structure that results from formation from a sheet of filter material.
  • the tobacco smoke filtering material may be over wrapped with a wrapper or plugwrap, for example a wrapper of paper, for example a wrapper of an air-permeable paper.
  • a wrapper or plugwrap for example a wrapper of paper, for example a wrapper of an air-permeable paper.
  • Particulate additives such as those discussed above may be applied to the wrapper or plugwrap surrounding the filter material, for example as described in GB 2261152 .
  • a multiple rod comprising a plurality of filters or filter elements as described above and/or herein integrally joined end-to-end in a mirror image relationship.
  • a filter element according to the invention may be used as a segment of a multi-segment slim filter, e.g. a dual, triple, other multiple filter. Such filters are well known in the art. If the filter element is used as or in a segment of a multi-segment filter, it may be used at (or in) the mouth or buccal end segment of the filter, or as (or in) any other segment of the filter. A filter element according to the invention may be used on its own e.g. as a single segment slim filter (e.g. in the same way as a monoacetate filter). Such filters are well known in the art.
  • a filter of the invention (or a filter which includes a filter element of the invention) is joined to a wrapped tobacco rod with one end of the filter towards the tobacco.
  • the filter may, for example, be joined to the wrapped tobacco rod by ring tipping [which engages around just the adjacent ends of a (wrapped) filter and rod to leave much of the filter wrap exposed] or by a full tipping overwrap (which engages around the full filter length and the adjacent end of the tobacco rod).
  • Any filter or filter cigarette according to the invention may be unventilated, or may be ventilated by methods well known in the art, e.g. by use of a pre-perforated or air-permeable plugwrap, and/or laser perforation of plugwrap and tipping overwrap.
  • FIGURE 1 is a plan view, not to scale, of an individual filter in an embodiment of the invention
  • FIGURE 2 shows a cross-section of the filter of Figure 1 .
  • the filter 1 shown in Fig.1 includes a porous elongated cylindrical plug 2 of circumference 16.9 mm and length 27 mm, which comprises a plurality of randomly oriented individual or staple filamentary fibres 3 formed from a 5Y30,000 cellulose acetate tow plasticised with triacetin.
  • the staple fibres 3 generally extend transversely to the longitudinal axis of the element and tie back slightly to form a multiplicity of contact points at which the staple fibres 3 are bonded to each other.
  • the bound fibres provide a substantially homogeneous filtering material which forms the plug 2.
  • the substantially homogeneous filtering material so-formed may be described as a porous matrix, which provides a labyrinth of smoke passages when used as a cigarette filter.
  • the filter element 1 has substantially uniform physical characteristics throughout the cross-section.
  • the filter may be manufactured by known methods, for example the method disclosed in US 3, 552, 400 .
  • a raw tow of the cellulose acetate is passed through a conventional banding device so as to separate the individual filaments thereof, and a further conventional banding device, which may be utilised to spread the tow into a relatively thin filamentary layer.
  • the filamentary layer is then passed through a conventional plasticising device wherein a suitable plasticiser (triacetin in the present example) is sprayed by suitable jets onto one or both sides of the filamentary layer to form a plasticised tow.
  • a conventional feeding means such as a pair of rollers is utilised to deliver the plasticised tow to a processing apparatus for making staple fibres and forming these into a continuous rod.
  • a suitable apparatus is described in full detail in US 3,552,400 and shown in Fig.1 of that document.
  • the plasticised tow is fed through a funnel to a chopper which severs the continuous tow into a multiplicity of discrete staple fibres, the length of which depends upon the relationship between the speed of the chopper and the rate of the feed of the continuous tow into the chopper.
  • the staple fibres produced by the chopper are sucked from the chopper by means of a turbulent air stream which disperses the staple fibres (and provides or increases their random orientation) and directs these through a porous frusto-conical screen, the smaller or outlet end of which feeds onto a moving porous belt.
  • Particulate or other additives may, if desired, be fed into the turbulent air stream and dispersed throughout the filter material at this stage.
  • the porous enclosing means is tapered and slows the speed of the staple fibres passing therethrough, and also tends to dispose the staple fibres so the length of a portion of fibres is disposed substantially transversely to the longitudinal axis of the product filter rod.
  • the staple fibres are fed onto the porous belt, which moves the fibres longitudinally into a steam treating chamber.
  • a bore at the entrance to the steam-treating chamber forms the longitudinal edges of the porous belt about the staple fibres as the belt and fibres thereon are drawn longitudinally through the bore.
  • the drawing of the belt around the fibres thus completes the formation of the staple fibres into a rod surrounded by the porous belt.
  • Steam is applied to the porous surface of the belt and passes continuously and directly therethrough to treat the staple fibres held therein.
  • the bonding constituents of the staple fibres e.g. the triacetin
  • the belt and staple fibres entrained therein are then drawn through a cooling station as is also well known in the art and thus the drying and cooling of the element (and setting of the bonding constituents) takes place in the cooling station.
  • the cylindrical rod so-formed may be wrapped in a plugwrap paper (not shown) and sealed with a lap adhesive by means that are well-known in the prior art.
  • the resulting dried and cooled continuous cylindrical rod formed of randomly oriented staple fibres is peeled from the belt as it leaves the cooling station, [the belt being substantially flattened and continuously orbited back to a position in the region of the screen to gather further additional staple fibres from the screen and draw these into the steam chamber].
  • the initial continuous cylindrical rod formed of randomly oriented staple fibres as it issues continuously from the machine outlet is cut into finite lengths for subsequent use.
  • Table 1 compares Sample A, a filter made according to the method of US 3, 552, 400 , and which includes a filtering material formed from a plurality of randomly oriented staple fibres of plasticised cellulose acetate, with a prior art monoacetate filter of the same dimensions.
  • the hardness values (defined as the compressed diameter of the filter rod as a percentage of the initial rod diameter, the compression of the rod being caused by a known weight applied through a circular foot for a specific period of time) and pressure drop (PD) (expressed in mm Water Gauge) were measured for the samples.
  • the yields of phenolic compounds were measured for all samples smoked under ISO conditions; cresols are the combined yields of o-, m- and p-cresol, whilst Di Hydroxy Phenols are the combined yields of Hydroquinone, Resorcinol and Catechol.
  • the tar yields from the cigarettes were also measured in order that the changes in the ratios of phenols to tar could be assessed.
  • the values for Sample A are expressed as a % value of that for the prior art monoacetate filter (i.e. the value for the monoacetate filter is taken as 100, and that for Sample A expressed as a percentage of that value).
  • Sample A The reductions in phenolic compounds in Sample A are even more significant when the lower weight of cellulose acetate in Sample A (which includes the filtering material formed from a plurality of randomly oriented staple fibres of plasticised cellulose acetate) compared to the monoacetate product is taken into account (Sample A includes 77.5% by weight of the amount of tow of the monoacetate filter).
  • Example 3 type of tow
  • samples A and B are the same as those used in any standard (c. 24.5 mm) circumference product; whereas the above monoacetate control superslim sample required a more expensive low total denier tow.
  • This example illustrates that filters of the invention provide acceptable characteristics using much higher total denier cellulose tows than for a conventional superslim product.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Cigarettes, Filters, And Manufacturing Of Filters (AREA)

Description

  • The present invention relates to filters and filter elements for smoking articles such as cigarettes, in particular slim cigarettes.
  • An example of slim cigarette is disclosed in WO 2006/082161 .
  • Conventional cigarettes have a circumference around 24.5 mm - 'slim' cigarettes (circumference around 21 - 23.2 mm) and 'superslim' cigarettes (circumference around 16 - 18 mm) are also known. It is also possible to manufacture cigarettes with even narrower circumferences, e.g. in the range 14 -16 mm, although these are not generally commercially available. In the context of this document, the term 'slim' should be construed as including all cigarettes and/or cigarette filters with a circumference between around 14.0 and 23.2 mm.
  • Selective filtration occurs when the yield of selected chemicals in cigarette smoke is proportionally reduced to a greater extent than the majority of compounds in smoke (e.g. tar). Phenolic compounds - for example phenol, cresols, catechol and resorcinol - are known constituents of cigarette smoke. They are toxic compounds - in particular, phenol and catechol are included on the so-called "Hoffmann" list of the most hazardous compounds found in cigarette smoke. It is considered desirable to potentially selectively reduce the quantities of these compounds delivered to the smoker.
  • The usual filtering material used in cigarette filters is a continuous tow of filamentary cellulose acetate plasticised with triacetin, which is gathered together in rod form to form the filter or filter element. In such a continuous tow (and in filters and filter elements formed therefrom) the filaments of cellulose acetate tow are predominantly aligned in the longitudinal direction. It is well known that cellulose acetate exhibits a selective filtering action towards phenolic compounds. A filter for a "slim" cigarette will naturally include a reduced volume of cellulose acetate filtering material compared to a standard filter; any selective filtering effect may be reduced as there is less material available to act upon a similar quantity of smoke. It is desirable, therefore, to provide a slim filter which potentially selectively reduces the quantities of phenolic compounds delivered to the smoker of a slim cigarette.
  • The specification of a filter tow is described in terms of the denier per filament (dpf); total denier; and the fibre cross-sectional shape. The filament denier is defined as the weight in grams of 9000 metres of a single filament; the total denier is then simply the dpf multiplied by the number of filaments in the tow. Thus, for example, a 5Y30,000 tow describes a material with a filament with a dpf of 5 grams per 9000 metres in the shape of a Y, comprising 6,000 filaments giving a total denier of 30,000 grams per 9000 metre length. In order to manufacture a standard cellulose acetate ("monoacetate") cigarette filter having a low circumference (i.e. a slim monoacetate filter), it is necessary to use a cellulose acetate tow with a low total denier because there are limitations on the amount of material than can be packed into the slim product. It is well known in the industry that low total denier tows are more expensive (per unit weight) than higher total denier tows and there is also limited commercial availability of low total denier tows. It is desirable, therefore, to provide a slim filter, which can be made from a wider range of total denier of cellulose acetate tows than conventional slim or superslim monoacetate filters.
  • According to the present invention there is provided a tobacco smoke filter or filter element comprising a cylindrical plug of a substantially homogeneous filtering material of circumference between 14.0 and 23.2 mm (for example, between 16 and 23.2 mm), wherein the substantially homogeneous filtering material comprises a plurality of randomly oriented staple fibres.
  • Herein, the term "substantially homogeneous filtering material" means a filtering material which has substantially uniform physical characteristics throughout any cross-section therethrough.
  • Herein, the term "staple fibres" means individual, discrete, fibres of specific length. The staple fibres may be randomly oriented with reference to one another. The substantially homogeneous filtering material may comprise a plurality of randomly oriented staple fibres wherein a portion of the randomly oriented staple fibres generally extend transversely to the longitudinal axis of the cylindrical plug. The substantially homogeneous filtering material may comprise a plurality of randomly oriented staple fibres at least 10% (for example, 20%, 30%, 40%, 50%, 60%, 70%, 80% or 90%) of which by weight extend substantially transversely to the longitudinal axis of the cylindrical plug.
  • The term randomly oriented staple fibres means that the staple fibres are randomly oriented in three dimensions (in the filter or filter element). The term randomly oriented staple fibres, herein, is not intended to (and does not) mean a continuous cellulose acetate tow, the individual strands of which are predominantly aligned in the longitudinal direction (although it will be appreciated that staple fibres may be formed from such tows, as discussed below). The term randomly oriented staple fibres, herein, is not intended to (and does not) mean a web or sheet of filtering material which is formed (from e.g. pulp and/or fibres) and then shaped as a whole or substantially whole web or sheet into rod form (by e.g. wrapping). The term randomly oriented staple fibres does not mean a two dimensional paper-like artefact which is taken up in a roll form. The term randomly oriented staple fibres, herein, is not intended to (and does not) mean a web or sheet of filtering material which is formed (from e.g. pulp and/or fibres) and then shredded and then shaped into rod form. Sheets or webs may have random orientation in two dimensions but (even when shredded) undergo processes (such as embossing) so they retain some integrity when drawn through a filter making machine. Thus, the fibres in a filter or filter element made from a sheet or web (even a shredded sheet or web) will be predominantly aligned along the longitudinal axis of the filter or filter element, and are therefore not randomly oriented (in three dimensions) staple fibres.
  • The plurality of randomly oriented staple fibres may form a porous matrix providing a labyrinth of passages - these may act as passages for smoke when utilised as a cigarette filter. The applicants have found that the performance of the filter or filter element of the invention may be comparable to existing products (e.g. a "monoacetate" product formed of a continuous tow of longitudinally oriented filaments of cellulose acetate tow plasticised with triacetin gathered together in rod form), but the applicants have found that 20-30% less filtering material (e.g. cellulose acetate) is required when it is used in the form of randomly oriented staple fibres. In addition to the requirement for less filtering material per filter, there is the further advantage that it is possible to use much higher total denier cellulose acetate tows than for a conventional superslim product. Thus, in addition to the cost benefits of the weight saving arising due to the applicant's invention (because less filtering material is required), the unit cost of the tow used itself may also be cheaper, because there is no longer the need to use (expensive and less readily available) low total denier tows.
  • The applicants have unexpectedly found that tobacco smoke filters or filter elements of the invention may provide enhanced removal of phenols from tobacco smoke (in a slim cigarette), compared to e.g. a standard monoacetate filter or filter element (which does not comprise randomly oriented staple fibres). The unexpected reduction in phenolic compounds by filters and filter elements of the invention is even more significant when the lower weight of filtering material (cellulose acetate) is taken into account. The applicants have also unexpectedly found that tobacco smoke filter or filter elements of the invention may be more readily and swiftly degraded under e.g. environmental conditions, compared to e.g. a standard monoacetate filter or filter element.
  • The staple fibres may be made of filamentary material. The staple fibres may be crimped, as is well known in the art. The staple fibres may be, for example, cellulose acetate or polypropylene fibres. The staple fibres may be made of (or formed from) a fibre tow, for example cellulose acetate tow, polypropylene tow. The staple fibres may be, for example, natural and/or synthetic fibres; fibres formed from natural plant material(s) etc. The staple fibres may be cellulose pulp fibres (e.g. which have been fiberized via a hammermill). The staple fibres may be cut herbs (e.g. cut tobacco leaf), or obtained from reconstituted tobacco sheet. The staple fibres may impart flavouring and/or filtration properties to the final product. The staple fibres may be of substantially the same length (of substantially uniform length). The staple fibres may be of a variety of different lengths. The stable fibres may be for example of length between 4 mm and 20 mm, e.g. between 5 mm and 19 mm, e.g. between 6 mm and 18 mm, e.g. between 7 mm and 16 mm. The staple fibres may be made of, or formed from, a fibre tow, for example cellulose acetate tow, of total denier of from 14,000g to 55,000g per 9,000m length, e.g. from 20,000g to 50,000g per 9,000m length, e.g. from 23,000g to 45,000g per 9,000m length, e.g. from 25,000g to 40,000g per 9,000m length.
  • The substantially homogeneous filtering material may optionally include other material, for example a liquid additive (such as a flavourant, e.g. menthol solution). The substantially homogeneous filtering material comprising a plurality of randomly oriented staple fibres may be formed from a plurality of staple fibres, and may optionally include other material, for example a plasticiser, a binder material or other additive. The staple fibres may be bonded to each other (e.g. due to action of a plasticiser) at a multiplicity of contact points.
  • The substantially homogeneous filtering material may optionally include a binder material. The substantially homogeneous filtering material may optionally include a water soluble binder material. Examples of water soluble materials include water soluble polymer materials such as polyvinyl alcohol, polyvinyl pyrrolidone, polyvinyl ether, starches, polyethylene glycols and polypropylene glycols; blends of water soluble binders with plasticisers such as triacetin; and hot melt water soluble binders in particulate form. The inclusion of a water soluble binder material may further enhance the ability of the filter or filter element to be readily and swiftly degraded e.g. under environmental conditions.
  • The filter or filter element may include one or more particulate additives - e.g. within the body of the filter or filter element. The (or each) particulate additive may be a powder (e.g. particles of 50 to 150 µm diameter) or granular (e.g. particles of 0.15 to 1.0 mm diameter). Examples of suitable particulate additives include flavourants or sorbents - e.g. activated carbon, zeolite, ion exchange resin (e.g. a weakly basic anion exchange resin), sepiolite, silica gel, alumina, molecular sieves, carbonaceous polymer resins and diatomaceous earths.
  • The filter or filter element may include more than one type of staple fibre. For example, staple fibres which are fibres (of e.g. cellulose pulp) which have been fiberized via a hammermill may be included in the filter in addition to (e.g. mixed with) staple fibres formed from a filamentary tow.
  • The staple fibres (e.g. of fibre tow, e.g. cellulose acetate tow) may be plasticised. In other words, the substantially homogeneous filtering material may optionally include a plasticiser. The formation of plasticised tow is well known in the art. The plasticiser (which plasticises the staple fibres) may be, for example, triacetin, triethyleneglycol diacetate (TEGDA) or polyethylene glycol (PEG). The staple fibres may be fibres of plasticised cellulose acetate tow. The staple fibres may be cellulose acetate tow which has been plasticised with e.g. triacetin.
  • The circumference of the cylindrical plug may be for example between 14.0 mm and 23.2 mm, for example between 16 and 23.2 mm, for example between 16.0 mm and 20mm, for example between 16.2mm and 20mm, for example between 16.2 mm and 17 mm.
  • The plurality of randomly oriented staple fibres may form a porous matrix providing a labyrinth of passages in the filtering material. The labyrinth passages may function as passages for smoke when utilised as a cigarette filter.
  • The tobacco smoke filter or filter element may have substantially uniform physical characteristics throughout any cross-section thereof, rather than the more uneven structure that results from formation from a sheet of filter material.
  • In filters and filter elements according to aspects of the invention, the tobacco smoke filtering material may be over wrapped with a wrapper or plugwrap, for example a wrapper of paper, for example a wrapper of an air-permeable paper. Particulate additives such as those discussed above may be applied to the wrapper or plugwrap surrounding the filter material, for example as described in GB 2261152 .
  • According to the invention in a further aspect there is provided a multiple rod comprising a plurality of filters or filter elements as described above and/or herein integrally joined end-to-end in a mirror image relationship.
  • A filter element according to the invention may be used as a segment of a multi-segment slim filter, e.g. a dual, triple, other multiple filter. Such filters are well known in the art. If the filter element is used as or in a segment of a multi-segment filter, it may be used at (or in) the mouth or buccal end segment of the filter, or as (or in) any other segment of the filter. A filter element according to the invention may be used on its own e.g. as a single segment slim filter (e.g. in the same way as a monoacetate filter). Such filters are well known in the art.
  • In a filter cigarette according to the invention, a filter of the invention (or a filter which includes a filter element of the invention) is joined to a wrapped tobacco rod with one end of the filter towards the tobacco. The filter may, for example, be joined to the wrapped tobacco rod by ring tipping [which engages around just the adjacent ends of a (wrapped) filter and rod to leave much of the filter wrap exposed] or by a full tipping overwrap (which engages around the full filter length and the adjacent end of the tobacco rod). Any filter or filter cigarette according to the invention may be unventilated, or may be ventilated by methods well known in the art, e.g. by use of a pre-perforated or air-permeable plugwrap, and/or laser perforation of plugwrap and tipping overwrap.
  • The present invention will now be illustrated with reference to the following Examples and the attached drawings in which FIGURE 1 is a plan view, not to scale, of an individual filter in an embodiment of the invention; and FIGURE 2 shows a cross-section of the filter of Figure 1.
  • The filter 1 shown in Fig.1 includes a porous elongated cylindrical plug 2 of circumference 16.9 mm and length 27 mm, which comprises a plurality of randomly oriented individual or staple filamentary fibres 3 formed from a 5Y30,000 cellulose acetate tow plasticised with triacetin. As shown in Figs. 1 and 2 the staple fibres 3 generally extend transversely to the longitudinal axis of the element and tie back slightly to form a multiplicity of contact points at which the staple fibres 3 are bonded to each other. The bound fibres provide a substantially homogeneous filtering material which forms the plug 2. The substantially homogeneous filtering material so-formed may be described as a porous matrix, which provides a labyrinth of smoke passages when used as a cigarette filter. The filter element 1 has substantially uniform physical characteristics throughout the cross-section.
  • The filter may be manufactured by known methods, for example the method disclosed in US 3, 552, 400 . Thus, a raw tow of the cellulose acetate is passed through a conventional banding device so as to separate the individual filaments thereof, and a further conventional banding device, which may be utilised to spread the tow into a relatively thin filamentary layer. The filamentary layer is then passed through a conventional plasticising device wherein a suitable plasticiser (triacetin in the present example) is sprayed by suitable jets onto one or both sides of the filamentary layer to form a plasticised tow. A conventional feeding means such as a pair of rollers is utilised to deliver the plasticised tow to a processing apparatus for making staple fibres and forming these into a continuous rod. A suitable apparatus is described in full detail in US 3,552,400 and shown in Fig.1 of that document. The plasticised tow is fed through a funnel to a chopper which severs the continuous tow into a multiplicity of discrete staple fibres, the length of which depends upon the relationship between the speed of the chopper and the rate of the feed of the continuous tow into the chopper. The staple fibres produced by the chopper are sucked from the chopper by means of a turbulent air stream which disperses the staple fibres (and provides or increases their random orientation) and directs these through a porous frusto-conical screen, the smaller or outlet end of which feeds onto a moving porous belt. Particulate or other additives (not shown) may, if desired, be fed into the turbulent air stream and dispersed throughout the filter material at this stage. The porous enclosing means is tapered and slows the speed of the staple fibres passing therethrough, and also tends to dispose the staple fibres so the length of a portion of fibres is disposed substantially transversely to the longitudinal axis of the product filter rod. The staple fibres are fed onto the porous belt, which moves the fibres longitudinally into a steam treating chamber. A bore at the entrance to the steam-treating chamber forms the longitudinal edges of the porous belt about the staple fibres as the belt and fibres thereon are drawn longitudinally through the bore. The drawing of the belt around the fibres thus completes the formation of the staple fibres into a rod surrounded by the porous belt. Steam is applied to the porous surface of the belt and passes continuously and directly therethrough to treat the staple fibres held therein. The bonding constituents of the staple fibres (e.g. the triacetin) are thus activated by the steam while the fibres are carried in cylindrical rod shaped form enclosed by the belt. It is noted that this processing is well known in the art and is described in the US patent mentioned above. The belt and staple fibres entrained therein are then drawn through a cooling station as is also well known in the art and thus the drying and cooling of the element (and setting of the bonding constituents) takes place in the cooling station. The cylindrical rod so-formed may be wrapped in a plugwrap paper (not shown) and sealed with a lap adhesive by means that are well-known in the prior art. The resulting dried and cooled continuous cylindrical rod formed of randomly oriented staple fibres is peeled from the belt as it leaves the cooling station, [the belt being substantially flattened and continuously orbited back to a position in the region of the screen to gather further additional staple fibres from the screen and draw these into the steam chamber]. The initial continuous cylindrical rod formed of randomly oriented staple fibres as it issues continuously from the machine outlet is cut into finite lengths for subsequent use. It may be severed by cutting means for example to form single filters (such as filter 1 of Figure 1) each of which is then attached to an individual wrapped tobacco rod to form a filter cigarette, or to form individual filter elements. More usually, however, the continuously issuing rod is first cut into double or higher multiple (usually quadruple or sextuple) length rods of filters 1 (or filter elements) for subsequent use. The formation of multiple length filters (and their subsequent incorporation into filter cigarettes) is well known in the art.
  • Example 2 Phenol Reduction
  • The following Table 1 compares Sample A, a filter made according to the method of US 3, 552, 400 , and which includes a filtering material formed from a plurality of randomly oriented staple fibres of plasticised cellulose acetate, with a prior art monoacetate filter of the same dimensions. The hardness values (defined as the compressed diameter of the filter rod as a percentage of the initial rod diameter, the compression of the rod being caused by a known weight applied through a circular foot for a specific period of time) and pressure drop (PD) (expressed in mm Water Gauge) were measured for the samples. The yields of phenolic compounds were measured for all samples smoked under ISO conditions; cresols are the combined yields of o-, m- and p-cresol, whilst Di Hydroxy Phenols are the combined yields of Hydroquinone, Resorcinol and Catechol. The tar yields from the cigarettes were also measured in order that the changes in the ratios of phenols to tar could be assessed. The values for Sample A are expressed as a % value of that for the prior art monoacetate filter (i.e. the value for the monoacetate filter is taken as 100, and that for Sample A expressed as a percentage of that value). Table 1
    Parameter Sample A Monoacetate
    Tow Weight 77.5 100
    Rod Hardness 99.9 100
    Pressure Drop 100.6 100
    Tar yield* 103.1 100
    Nicotine yield* 95 100
    CO yield* 103.8 100
    Phenol yield* 78.1 100
    Total Cresols yield* 78.5 100
    Di Hydroxy Phenols yield* 95.9 100
    Phenol+Cresols** 75.7 100
    Di Hydroxy Phenols** (µg per mg of tar) 92.9 100
    Phenol Reduction per unit weight tow 141 100
    Total Cresols Reduction per unit weight tow 145 100
    * based on results expressed as "absolute" figures (i.e. mass/cigarette)
    ** based on results expressed as µg per mg of tar
  • As indicated above, it is desirable to reduce the levels of phenolic compounds in cigarette smoke. It is known that cellulose acetate exhibits a selective filtration effect towards phenols, so it would be expected that filters according to the invention which include randomly oriented staple fibres of cellulose acetate would be less effective in removing phenols than comparable monoacetate filters of similar pressure drop and hardness, because the former contain e.g. 20 to 30% less cellulose acetate. In fact, the results show that, surprisingly, Sample A gave reduced yields of phenolic compounds expressed on both an absolute basis and per mg of tar than an equivalent monoacetate product. The reductions in phenolic compounds in Sample A are even more significant when the lower weight of cellulose acetate in Sample A (which includes the filtering material formed from a plurality of randomly oriented staple fibres of plasticised cellulose acetate) compared to the monoacetate product is taken into account (Sample A includes 77.5% by weight of the amount of tow of the monoacetate filter).
  • The results indicate that filters and filter elements of the invention provide a surprising and marked selective reduction of phenolic compounds.
  • Example 3 Degradability
  • Different types of cigarette filters were placed in wire mesh cages on a rooftop site and their weights monitored periodically over a 12-month period. After 12-months, it was found that the weight of standard monoacetate filters had reduced by 23-30%, whilst the weight of a dimensionally comparable filter which includes a filtering material formed from a plurality of randomly oriented staple fibres of plasticised cellulose acetate had reduced by 46%. This is surprising because it would have been expected that a similar weight loss would have occurred.
  • Example 3 - type of tow
  • The properties of two superslim multiple filter rods A and B (each comprising four 27mm length filters of the invention of structure similar to the embodiment of Figs 1 and 2), and a comparable standard monoacetate superslim product "Control" are given below:
    A B 'Control'
    Tow Item 5Y30,000 4.2Y33,000 6Y17,000
    Rod Length (mm) 108 108 108
    Circumference (mm) 16.9 16.9 16.8
    Rod Weight (g) 0.291 0.281 0.416
    Rod Hardness (%) 88 89 91
    27mm Tip Pressure Drop (mm) 102 100 115
    27mm Tip Tar Retention (%) 29.4 30.5 33.6
    27mm Tip Nicotine Retn (%) 27.1 29.7 29.3
  • The tows used in samples A and B are the same as those used in any standard (c. 24.5 mm) circumference product; whereas the above monoacetate control superslim sample required a more expensive low total denier tow. This example illustrates that filters of the invention provide acceptable characteristics using much higher total denier cellulose tows than for a conventional superslim product.

Claims (17)

  1. A tobacco smoke filter or filter element comprising a cylindrical plug of a substantially homogeneous filtering material of circumference between 14.0 and 23.2 mm, wherein the substantially homogeneous filtering material comprises a plurality of randomly oriented staple fibres.
  2. A tobacco smoke filter or filter element according to claim 1 wherein the plug of substantially homogeneous filtering material is of circumference between 16.0 and 23.2 mm.
  3. A tobacco smoke filter or filter element according to claim 1 or 2 wherein the staple fibres are crimped.
  4. A tobacco smoke filter or filter element according to any preceding claim wherein the staple fibres are natural and/or synthetic fibres and/or fibres formed from natural plant material(s).
  5. A tobacco smoke filter or filter element according to any preceding claim wherein the staple fibres are cellulose acetate fibres or polypropylene fibres.
  6. A tobacco smoke filter or filter element according to any preceding claim including two or more types of staple fibres.
  7. A tobacco smoke filter or filter element according to any preceding claim further comprising a liquid additive or a particulate additive.
  8. A tobacco smoke filter or filter element according to any preceding claim wherein the staple fibres are of length between 4 mm and 20 mm.
  9. A tobacco smoke filter or filter element according to any preceding claim wherein the staple fibres are formed from a tow of total denier of between 14,000g and 55,000g per 9,000m length.
  10. A tobacco smoke filter or filter element according to any preceding claim including staple fibres which are plasticised.
  11. A tobacco smoke filter or filter element according to any preceding claim including cellulose acetate staple fibres plasticised with triacetin, triethyleneglycol diacetate (TEGDA), or polyethylene glycol (PEG).
  12. A tobacco smoke filter or filter element according to any preceding claim wherein the circumference of the cylindrical plug is between 16.2 mm and 23.2 mm.
  13. A tobacco smoke filter or filter element according to any preceding claim further comprising a wrapper or plugwrap.
  14. A tobacco smoke filter or filter element according to any preceding claim including a particulate additive on the wrapper or plugwrap.
  15. A tobacco smoke filter or filter element according to any preceding claim further comprising a water soluble binder material.
  16. A filter cigarette including a filter according to any preceding claim, or a filter which includes a filter element according to any preceding claim, joined to a wrapped tobacco rod.
  17. A multiple rod comprising a plurality of filters or filter elements according to any of claims 1 to 16 integrally joined end-to-end.
EP09703354A 2008-01-23 2009-01-23 Tobacco smoke filter Revoked EP2247206B1 (en)

Priority Applications (1)

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PL09703354T PL2247206T3 (en) 2008-01-23 2009-01-23 Tobacco smoke filter

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GB0801246A GB0801246D0 (en) 2008-01-23 2008-01-23 Tobacco smoke filter
GB0822366A GB0822366D0 (en) 2008-12-08 2008-12-08 Tobacco smoke filter
PCT/GB2009/000215 WO2009093051A2 (en) 2008-01-23 2009-01-23 Tobacco smoke filter

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Families Citing this family (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB201005547D0 (en) * 2010-04-01 2010-05-19 British American Tobacco Co Composite additive materials
EP2401929A1 (en) * 2010-06-30 2012-01-04 Philip Morris Products S.A. Filter for a smoking article
EP2462822A1 (en) * 2010-12-13 2012-06-13 Philip Morris Products S.A. Smoking article including flavour granules
US20120325233A1 (en) 2011-06-23 2012-12-27 Eastman Chemical Company Cellulose esters having mixed-phase titanium dioxide particles for improved degradation
US20120325231A1 (en) 2011-06-23 2012-12-27 Eastman Chemical Company Filters having improved degradation and methods of making them
US10064429B2 (en) 2011-09-23 2018-09-04 R.J. Reynolds Tobacco Company Mixed fiber product for use in the manufacture of cigarette filter elements and related methods, systems, and apparatuses
US20130115452A1 (en) * 2011-11-03 2013-05-09 Celanese Acetate Llc High Denier Per Filament and Low Total Denier Tow Bands
US8967155B2 (en) * 2011-11-03 2015-03-03 Celanese Acetate Llc Products of high denier per filament and low total denier tow bands
UA112328C2 (en) 2011-11-07 2016-08-25 Філіп Морріс Продактс С.А. MENTAL CONTINUOUS SMOKING PRODUCTS
GB2503644A (en) * 2012-05-03 2014-01-08 British American Tobacco Co Filter
GB201209345D0 (en) * 2012-05-25 2012-07-11 Filtrona Filter Prod Dev Co Tobacco smoke filter and method of production
CN104411189A (en) * 2012-07-13 2015-03-11 菲利普莫里斯生产公司 Degradable filter for smoking articles
US9179709B2 (en) 2012-07-25 2015-11-10 R. J. Reynolds Tobacco Company Mixed fiber sliver for use in the manufacture of cigarette filter elements
US9119419B2 (en) 2012-10-10 2015-09-01 R.J. Reynolds Tobacco Company Filter material for a filter element of a smoking article, and associated system and method
CN112189888A (en) 2013-03-28 2021-01-08 菲利普莫里斯生产公司 Smoking article comprising a flavour delivery member
GB201316210D0 (en) * 2013-09-11 2013-10-30 Filtrona Filter Prod Dev Co Tobacco smoke filter
AT515930B1 (en) * 2014-08-20 2016-01-15 Lenzing Akiengesellschaft Absorbent article and its use
EP3225116A4 (en) * 2014-11-28 2018-05-16 Daicel Corporation Tow band of cellulose acetate fibers for cigarette filter, cigarette filter, tow band production device, and tow band production method
TR201819930T4 (en) 2015-02-18 2019-01-21 Jt Int Sa High Additive Filters for Tobacco Smoking Products
GB201608810D0 (en) 2016-05-19 2016-07-06 British American Tobacco Co Cutting and arranging rods for tobacco industry products
US10524500B2 (en) * 2016-06-10 2020-01-07 R.J. Reynolds Tobacco Company Staple fiber blend for use in the manufacture of cigarette filter elements
US20200037659A1 (en) 2016-12-19 2020-02-06 Jt International S.A. Filters For Smoking Articles For Less Additive(s) Loss
SG11202007264XA (en) 2018-02-01 2020-08-28 Jt Int Sa Biodegradable filter with improved taste
CN111712141B (en) * 2018-03-08 2022-07-29 菲利普莫里斯生产公司 Aerosol-generating article
KR101976325B1 (en) * 2018-07-06 2019-05-07 주식회사 케이티앤지 Cigarette filter reducing smoke constituent, cigarette, and manufacturing method thereof
KR20200061098A (en) 2018-11-23 2020-06-02 주식회사 케이티앤지 cigarette for aerosol generating device and aerosol generating device using the cigarette
EP4054358A1 (en) * 2019-11-06 2022-09-14 Essentra Filter Products Development Co. Pte. Ltd. Filter element, mouthpiece and cooling element
KR102677239B1 (en) 2023-08-17 2024-06-20 윤종국 Cigarette-type electronic cigarette stick
KR102677237B1 (en) 2023-11-07 2024-06-20 윤종국 Electronic cigarette stick
KR102677240B1 (en) 2023-11-07 2024-06-20 윤종국 Electronic cigarette stick
KR102677238B1 (en) 2023-11-23 2024-06-20 윤종국 Electronic cigarette stick

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3616080C2 (en) * 1985-05-24 1990-12-06 British-American Tobacco Co. Ltd., London, Gb
DE4332019A1 (en) * 1993-09-16 1995-03-23 Reemtsma H F & Ph Ventilated filter cigarette
EP1014813A1 (en) * 1997-10-23 2000-07-05 H.F. & Ph.F. Reemtsma GmbH Thin cigarettes

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3119396A (en) * 1961-05-24 1964-01-28 Minnesota Mining & Mfg Tobacco smoke filter
US3334533A (en) * 1965-02-19 1967-08-08 Monsanto Co Staple fiber cutting mechanism
US3552400A (en) * 1967-06-08 1971-01-05 American Filtrona Corp Filter plug of staple fiber filter elements and the like
FR2371156A1 (en) * 1976-11-18 1978-06-16 Seita PROCESS FOR TRANSFORMATION OF TOBACCO INTO COHERENT AGGREGATES
US4274914A (en) * 1978-08-28 1981-06-23 Celanese Corporation Filter material
GB2145918B (en) * 1980-08-04 1985-10-16 Molins Plc Producing filler material particularly for cigarette filters
US4406294A (en) * 1982-02-16 1983-09-27 Brown & Williamson Tobacco Corporation Cigarette filter
GB8921659D0 (en) * 1989-09-26 1989-11-08 Cigarette Components Ltd Particulate sorbent smoke filter
GB9121782D0 (en) * 1991-10-14 1991-11-27 Cigarette Components Ltd Cigarette filter containing particulate smoke modifying additive
US5275859A (en) * 1992-12-21 1994-01-04 Eastman Kodak Company Tobacco smoke filter
US5509430A (en) * 1993-12-14 1996-04-23 American Filtrona Corporation Bicomponent fibers and tobacco smoke filters formed therefrom
JP4209999B2 (en) * 1998-05-19 2009-01-14 日本たばこ産業株式会社 Cigarette filter
EP1377184B2 (en) * 2001-02-22 2015-05-13 Philip Morris Products S.A. Cigarette and filter with downstream flavor addition
DE10217410A1 (en) * 2002-04-18 2003-10-30 Hauni Maschinenbau Ag Cigarette filter and method of making the same
GB2394394A (en) * 2002-10-23 2004-04-28 Filtrona Int Ltd Tobacco smoke filter
PL1464241T3 (en) * 2003-04-03 2007-02-28 Hauni Maschinenbau Ag Method for producing a fabric for the production of filters of the tobacco industry and apparatus for the production of a filter rod
US20050042470A1 (en) * 2003-08-22 2005-02-24 Vogler John William Cellulose ester based products and methods for making them
KR101291472B1 (en) * 2005-02-01 2013-07-30 필립모리스 프로덕츠 에스.에이. Slim Cigarette
US8231752B2 (en) * 2005-11-14 2012-07-31 Cummins Filtration Ip Inc. Method and apparatus for making filter element, including multi-characteristic filter element

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3616080C2 (en) * 1985-05-24 1990-12-06 British-American Tobacco Co. Ltd., London, Gb
DE4332019A1 (en) * 1993-09-16 1995-03-23 Reemtsma H F & Ph Ventilated filter cigarette
EP1014813A1 (en) * 1997-10-23 2000-07-05 H.F. & Ph.F. Reemtsma GmbH Thin cigarettes

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MX2010007986A (en) 2010-08-06
WO2009093051A2 (en) 2009-07-30
RU2010134016A (en) 2012-02-27
TW200936065A (en) 2009-09-01
RU2504309C2 (en) 2014-01-20
KR20100107505A (en) 2010-10-05
US20110023900A1 (en) 2011-02-03
BRPI0906555A2 (en) 2015-07-07
CA2712794C (en) 2016-11-01
JP5491413B2 (en) 2014-05-14
JP2011509682A (en) 2011-03-31
WO2009093051A3 (en) 2009-10-15
CN101938918B (en) 2013-07-17
CA2712794A1 (en) 2009-07-30
KR101765733B1 (en) 2017-08-07
EP2247206A2 (en) 2010-11-10
PL2247206T3 (en) 2013-04-30
BRPI0906555B1 (en) 2019-09-03
CN101938918A (en) 2011-01-05

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