Classifications

• • A—HUMAN NECESSITIES
  • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
  • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
  • A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
  • A24D3/06—Use of materials for tobacco smoke filters
  • A24D3/061—Use of materials for tobacco smoke filters containing additives entrapped within capsules, sponge-like material or the like, for further release upon smoking
• • A—HUMAN NECESSITIES
  • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
  • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
  • A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
  • A24D3/04—Tobacco smoke filters characterised by their shape or structure
• • A—HUMAN NECESSITIES
  • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
  • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
  • A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
  • A24D3/06—Use of materials for tobacco smoke filters
  • A24D3/062—Use of materials for tobacco smoke filters characterised by structural features
• • A—HUMAN NECESSITIES
  • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
  • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
  • A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
  • A24D3/06—Use of materials for tobacco smoke filters
  • A24D3/062—Use of materials for tobacco smoke filters characterised by structural features
  • A24D3/063—Use of materials for tobacco smoke filters characterised by structural features of the fibers
• • A—HUMAN NECESSITIES
  • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
  • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
  • A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
  • A24D3/06—Use of materials for tobacco smoke filters
  • A24D3/08—Use of materials for tobacco smoke filters of organic materials as carrier or major constituent
  • A24D3/10—Use 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 tobacco smoke filters and filter elements, for example for smoking articles such as cigarettes.
• a tobacco smoke filter or filter element comprising a longitudinally extending (e.g. substantially cylindrical) core of tobacco smoke filtering material of perimeter (e.g. circumference) 14 to 17 mm (e.g. 16 to 17 mm); and an additive release vessel (e.g. a capsule) fully enclosed within the core; wherein the filtering material is a filamentary material (e.g. a filamentary filter tow) having a filament denier of 5.3 or greater and a total denier of 18,000 or less.
• a filamentary material e.g. a filamentary filter tow
• the longitudinally extending core of tobacco smoke filtering material is a substantially cylindrical core of tobacco smoke filtering material.
• the longitudinally extending core of tobacco smoke filtering material is of circumference 16 to 17 mm (that is, the filter or filter element is a superslim filter or filter element).
• the filter or filter element may further include a wrapper (e.g. paper, plugwrap) engaged around the longitudinally extending (e.g. substantially cylindrical) core.
• the wrapper may be a wrapper of paper, for example a wrapper of an air-permeable paper.
• the additive release vessel (e.g. a capsule) is fully enclosed within the
• the additive release vessel e.g. a capsule
• the additive release vessel is not visible (to the smoker) at the mouth or buccal end of the filter/filter element, or at the mouth end of a cigarette including a filter of this aspect of the invention, in use.
• at least one end of the longitudinally extending (e.g. substantially cylindrical) core of tobacco smoke filtering material has a uniform appearance.
• at least one end of the longitudinally extending (e.g. substantially cylindrical) core of tobacco smoke filtering material has a uniform appearance such that only the tobacco smoke filtering material is visible at that end of the core (e.g. such that other components such as additive, channels or similar are not visible at that end of the core).
• a uniform end appearance e.g. an appearance such that only smoke filtering material is visible at that end of the core
• the tobacco smoke filtering material of the longitudinally extending core may be any filamentary material conventionally employed for tobacco smoke filter manufacture.
• the filtering material may be a natural or synthetic filamentary tow, e.g. of cotton or plastics such as polyethylene or polypropylene, or cellulose acetate filamentary tow.
• the filtering material is filamentary cellulose acetate tow.
• a tobacco smoke filter or filter element comprising a longitudinally extending (e.g. substantially cylindrical) core of tobacco smoke filtering material of perimeter (e.g. circumference) 14 to 17 mm (e.g. 16 to 17 mm); and an additive release vessel (e.g. a capsule) fully enclosed within the core; wherein the tobacco smoke filtering material is (e.g. filamentary) cellulose acetate (e.g. cellulose acetate tow) having a filament denier of 5.3 or greater and a total denier of 18,000 or less.
• the tobacco smoke filtering material is (e.g. filamentary) cellulose acetate (e.g. cellulose acetate tow) having a filament denier of 5.3 or greater and a total denier of 18,000 or less.
• the longitudinally extending core of tobacco smoke filtering material is a substantially cylindrical core of tobacco smoke filtering material.
• the longitudinally extending core of tobacco smoke filtering material is of circumference 16 to 17 mm (that is, the filter or filter element is a superslim filter or filter element).
• the filter or filter element may further include a wrapper (e.g. paper, plugwrap) engaged around the longitudinally extending (e.g. substantially cylindrical) core.
• the wrapper may be a wrapper of paper, for example a wrapper of an air-permeable paper.
• a filamentary tobacco smoke filtering material such as cellulose acetate
• cellulose acetate e.g. cellulose acetate
• 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 5.2Y18,000 tow describes a material with a filament with a dpf of 5.2 grams per 9000 metres in the shape of a Y, comprising about 3,500 filaments giving a total denier of 18,000 grams per 9000 metre length;
• a 6.8Y15,000 tow describes a material with a filament with a dpf of 6.8 grams per 9000 metres in the shape of a Y, comprising about 2200 filaments giving a total denier of 15,000 grams per 9000 metre length.
• the filamentary material may having a filament denier of 5.3 or greater, for example 5.3 to 13, for example 5.3 to 12, for example 5.3 to 9, for example 5.4 to 8, for example 6 to 7.
• the filamentary material e.g. filamentary filter tow, cellulose acetate, cellulose acetate tow
• the filamentary material e.g.
• filamentary filter tow, cellulose acetate, cellulose acetate tow may having a filament denier of 5.3, 5.4, 5.5, 5.6, 5.7, 5.8, 5.9, 6, 6.1 , 6.2, 6.3, 6.4, 6.5, 6.6, 6.7, 6.8, 6.9, 7, 7.1 , 7.2, 7.3, 7.4, 7.5, 7.6, 7.7, 7.8, 7.9, 8, 8.1 , 8.2, 8.3, 8.4, 8.5, 8.6, 8.7, 8.8, 8.9 , 9.
• the filamentary material may have a filament denier of 5.3 or greater, for example 5.4 or greater, for example 5.5 or greater, for example 5.6 or greater, for example 5.7 or greater, for example 5.8 or greater, for example 5.9 or greater, for example 6 or greater, for example 6.1 or greater, for example 6.2 or greater, for example 6.3 or greater, for example 6.4 or greater, for example 6.5 or greater.
• the filamentary material may have a total denier of 9,000 to 18,000, for example 10,000 to 18,000, for example 12,000 to 17,000, for example 14,000 to 16,000.
• the filamentary material e.g. filamentary filter tow, cellulose acetate, cellulose acetate tow
• the filamentary material e.g.
• filamentary filter tow, cellulose acetate, cellulose acetate tow may have a total denier of 10,000, 1 1 ,000, 12,000, 13,000, 14,000, 15,000, 16,000, 17,000, 18,000.
• the filamentary material may have a total denier of 18,000 or less, for example 17,900 or less, for example 17,800 or less, for example 17,700 or less, for example 17,600 or less, for example 17,500 or less, for example 17,400 or less, for example 17,300 or less, for example 17,200 or less, for example 17,100 or less, for example 17,000 or less.
• the filamentary material may be of any cross section (e.g. Y shaped cross section, X shaped cross section, circular cross section, the skilled person will appreciate that various cross sections are known in the art). Filamentary material of Y shaped cross section is preferred.
• the additive release vessel may be a capsule, for example a frangible capsule.
• the (e.g. frangible) capsule may include additive in the form of a flavourant.
• the additive release vessel [(e.g. frangible) capsule] may contain one or more additives, for example a flavourant and/or a liquid, solid or other material, such as activated carbon, e.g. to aid smoke filtration.
• the use of additive containing capsules in filters is well known in the art.
• the flavourant may be any flavourant known or suitable for use in a smoking article such as a cigarette, for example menthol, spearmint, peppermint, fenugreek, clove etc.
• the flavouring agent is or comprises menthol.
• the vessel (capsule) may comprise more than one flavouring agent (and may provide blends of different flavours, which may or may not include menthol).
• the filter or filter element may include additive in the form of flavourant [e.g. in the the additive release vessel [(e.g. frangible) capsule], wherein the amount of additive (flavourant) is less than 35mg (per filter/filter element).
• the filter or filter element may include additive in the form of flavourant [e.g. in the the additive release vessel [(e.g. frangible) capsule], wherein the amount of additive (flavourant) is less than 35mg (per filter/filter element).
• the filter or filter element may include additive in the form of flavourant [e.g. in the additive release vessel [(e.g.
• frangible) capsule wherein the amount of additive (flavourant) is 5 to 30 mg, for example 7 to 25 mg, for example 10 to 25 mg, for example 10 to 20mg (per filter/filter element).
• the additive release vessel (e.g. frangible) capsule] may be of width (when measured at its broadest point in a direction across the filter, that is perpendicular to the direction in which the longitudinally extending core extends) 2.0 to 4mm, e.g. 2.5 to 3.9mm, e.g. 3.0 to 3.8mm, e.g. 3.2 to 3.7 mm, e.g. 3.5 mm.
• the additive release vessel [(e.g. frangible) capsule] may include less than 35mg flavourant.
• the additive release vessel may be of width (when measured at its broadest point in a direction across the filter, that is perpendicular to the direction in which the longitudinally extending core extends) 2.0 to 4mm, e.g. 2.5 to 3.9mm, e.g. 3.0 to 3.8mm, e.g. 3.2 to 3.7 mm, e.g. 3.5 mm.
• the additive release vessel [(e.g. frangible) capsule] may include less than 35
• [(e.g. frangible) capsule] may include from 5 to 30 mg, for example 7 to 25 mg, for example 10 to 25 mg, for example 10 to 20mg flavourant.
• the filter or filter element may be of length 10 to 30 mm, e.g. 14 to 27 mm, e.g. 17 to 25 mm.
• Example 1 the present applicants made superslim filters without capsules to determine minimum, maximum and optimum tow weights for the relevant filter dimensions, and then made corresponding filters with capsules, in order to assess the effect of the capsules on the pressure drop.
• a capsule in filter including a core of a filamentary filtering material (e.g. cellulose acetate tow) with a filament denier of 5.3 or greater (e.g. 6.8) and a total denier of 18,000 or less (e.g. 15,000) was associated with only a fairly small increase in pressure drop.
• filamentary filter material e.g. cellulose acetate tow
• having filament denier of 5.3 or greater e.g. 6.8
• a total denier of 18,000 or less e.g. 15,000
• 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.
• the filter element 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.
• the filter element is used as or in a segment of a multi-segment filter, the other segments may be, for example, wrapped or non-wrapper actetate segments; segments which include particulate or liquid additives such as activated carbon or flavours (e.g.
• a filter element according to the invention may be used on its own e.g. as a single segment superslim or microslim filter (e.g. in the same way as a monoacetate filter).
• Filters of the invention may be packaged and sold for use in Roll Your Own or Make
• a-TipTM filters for Roll-Your-Own (RYO) Smokers which are well known and available from Filtrona Filters.
• Pop-a-Tip filters-type comprise a series of filters (filter tips) wrapped in a transparent film e.g. made of BOPP or cellophane. The filters are individually pushed (or 'popped') out of the transparent wrap by smokers of RYO products, who then use the filter when rolling their cigarette.
• a product rod comprising a plurality (e.g. two or more, e.g.
• the common wrapper may be a transparent material e.g. made of BOPP or cellophane.
• 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 be joined to the wrapped tobacco rod by ring tipping [which engages around just the adjacent ends of the (wrapped) filter and rod to leave much of the filter wrap exposed].
• the filter may be joined by a full tipping overwrap (which engages around the full filter length and the adjacent end of the tobacco rod).
• the filter, filter element or filter cigarette according to the invention may be ventilated by methods well known in the art, e.g. by use of a pre-perforated or air- permeable wrapper, and/or laser perforation of the wrapper and, if present, tipping overwrap.
• a ventilating full tipping overwrap may likewise be inherently air-permeable or provided with ventilation holes, and in ventilated products where both wrapper and tipping overwrap are present ventilation through the overwrap will usually (and preferably) be in register with that through the wrapper (e.g. plugwrap). Ventilation holes through the filter wrapper, or through a tipping overwrap, or through both simultaneously, may be made by laser perforation during filter or filter cigarette production, as is well known in the art.
• a multiple rod comprising a plurality (e.g. 2, 4, 6 etc.) of filters (or filter elements) as described above and/or herein integrally joined end-to-end in a mirror image relationship.
• FIGURE 1 is a view of a tobacco smoke filter according to an example of the invention.
• FIGURE 2 is a view of the tobacco smoke filter of figure 1 with part cut away to show the interior of the filter;
• FIGURE 3 shows the capability curve for the 5.2Y18000 tow, as described in Example 1 below.
• FIGURE 4 shows the capability curve for the 6.8Y15000 tow described in Example 1 below.
• the filter 1 shown in Fig. 1 includes a longitudinally extending substantially cylindrical core 2 of tobacco smoke filtering material of perimeter 16.8 mm and length 27 mm. (In actual fact the core 2 has circumference 16.8 mm, because the cylindrical core 2 is of circular cross-section.)
• the filtering material is a 6.8Y15,000 filamentary tow of filamentary cellulose acetate.
• Filter 1 also includes a wrapper 3 of plugwrap which is engaged around the longitudinally extending core 2 and held in place by a lapped and stuck seam, as is well known in the art.
• Filter 1 also includes an additive release vessel in the form of a flavour containing frangible capsule 5 which is fully enclosed within the cylindrical core 2; the filtering material completely encloses the capsule.
• the additive release vessel is a spherical capsule 5 having diameter 3.5 mm which comprises a breakable outer shell 6 of gelatin or similar, which encloses menthol containing liquid 7.
• frangible or breakable spherical capsules 5, which include flavourant therein, and their methods of manufacture, are well known in the art.
• Methods for making capsule containing filters are well known. It is well known to make longitudinally extending filter rods from filamentary filter materials such as cellulose acetate tow by drawing the cellulose acetate filamentary tow from a source, gathering the longitudinally advancing tow (e.g. by passing through a nozzle), and advancing the gathered/compressed tow through a garniture where the newly formed longitudinally extending rod of filtering material is wrapped in a plugwrap, and the plugwrap fixed in place by a lapped and stuck seam.
• the longitudinally advancing rod may be cut into individual filters, or, more usually, into multiple rod comprising a plurality (e.g. 2, 4, 6 etc.) of filters.
• This method may be adapted to make capsule containing filters by including a machine which inserts capsules (such machines are well known) into the process.
• capsules such machines are well known
• (spherical) capsules 5 are held in a stack and fed consecutively into the longitudinally advancing filamentary cellulose acetate tow as it is gathered, so the advancing tow is gathered and compressed around capsules 5 as it passes through the nozzle and into the garniture.
• the resulting longitudinally advancing rod which includes capsules is cut into filters/rods in the usual manner.
• the filter of Fig. 1 may be joined to a wrapped tobacco rod (not shown) with one end of the filter towards the tobacco, by methods well known in the art.
• the filter may be joined to the wrapped tobacco rod by ring tipping, which engages around just the adjacent ends of the wrapped filter 1 and rod to leave much of the wrapper 3 exposed, or joined by means of a full tipping overwrap which engages around the full length of the filter 1 and the adjacent end of the tobacco rod.
• Example 1 trials for the manufacture of superslim capsule filters.
• Each multiple length filter rod comprised a longitudinally extending substantially cylindrical core of filamentary cellulose acetate of length 108mm and a circumference of 16.8mm. It will be appreciated that this rod is a multiple rod which may be cut down to four filters of length 27mm (a so called "4 up" rod).
• Two different cellulose acetate filter tows were used - 5.2Y18000 and 6.8Y15000. As is well-known, the first number (5.2 or 6.8) refers to the filament denier, Y refers to the filament cross-sectional shape and the second number (15000 or 18000) refers to the total denier of the tow.
• Tables 1 and 2 below show capability against pressure drop results for 'mono' filter rods and capsule containing filter rods including 5.2Y18000 tow (Table 1 ) and 6.8Y15000 tow (Table 2) following the assessment, and these data are also shown graphically in Figures 3 and 4.
• the minimum point was determined as the tow weight which gave a 1 mm recess in the finished rod (i.e. the tow 'sprang back' to give a dished end to the finished filter/rod after cutting).
• the maximum point was determined by the tow weight which yielded a co-efficient of variation in pressure drop of around 6% - higher variability values are generally considered unacceptable.
• Tow weights were input into the virtual tow selector program to determine the 'capability percentage' shown in the Tables.
• the 5.2Y18000 tow item provided a capability range of -1 to 36%.
• the 6.8Y15000 tow item yielded a capability range of 0 to 70%.
• Pressure drop is a key parameter in filter design. Decision criteria for available pressure drop range would be typically based on those data points that yielded a coefficient of variation of 6% or less from the tow items.
• the available pressure drop range from the capsule filters using these tows was accordingly found to be 270-380mm water gauge for 6.8Y15000 tow and 480-550mm water gauge for 5.2Y18000 tow. Use of these tows outside these ranges, may yield poorly running or performing product (i.e. which is difficult to manufacture or has inferior performance).
• the addition of the capsule caused an increase in the pressure drop of the rod.
• the 5.2Y18000 tow saw an average pressure drop increase of 33mm per tip (based on results for a 108mm/4-up rod) whilst the average tip PD increase for the
• a capsule in filter including a core of a filamentary filtering material e.g. cellulose acetate tow
• a filament denier of 5.3 or greater e.g. 6.8
• a total denier of 18,000 or less e.g. 15,000
• filamentary filter material e.g. cellulose acetate tow
• having filament denier of 5.3 or greater e.g. 6.8
• a total denier of 18,000 or less e.g. 15,000

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

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• 2013
  • 2013-09-11 GB GB201316210A patent/GB201316210D0/en not_active Ceased
• 2014
  • 2014-09-10 WO PCT/EP2014/069328 patent/WO2015036454A1/en active Application Filing
  • 2014-09-10 JP JP2016541926A patent/JP2016533764A/ja active Pending
  • 2014-09-10 RU RU2016111367A patent/RU2696025C2/ru active
  • 2014-09-10 CN CN202410098072.8A patent/CN117814529A/zh active Pending
  • 2014-09-10 EP EP14761669.2A patent/EP3043662B1/en active Active
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  • 2014-09-10 CN CN201480050217.1A patent/CN105813483A/zh active Pending
  • 2014-09-10 US US15/021,198 patent/US20160219930A1/en not_active Abandoned
• 2019
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