EP2866595B1 - Tobacco smoke filter - Google Patents
Tobacco smoke filter Download PDFInfo
- Publication number
- EP2866595B1 EP2866595B1 EP13732893.6A EP13732893A EP2866595B1 EP 2866595 B1 EP2866595 B1 EP 2866595B1 EP 13732893 A EP13732893 A EP 13732893A EP 2866595 B1 EP2866595 B1 EP 2866595B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- filter
- wrapper
- core
- tobacco smoke
- adhesive
- 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.)
- Active
Links
- 235000002637 Nicotiana tabacum Nutrition 0.000 title claims description 110
- 239000000779 smoke Substances 0.000 title claims description 95
- 244000061176 Nicotiana tabacum Species 0.000 title 1
- 239000000853 adhesive Substances 0.000 claims description 124
- 230000001070 adhesive effect Effects 0.000 claims description 124
- 241000208125 Nicotiana Species 0.000 claims description 109
- 239000000463 material Substances 0.000 claims description 99
- 238000001914 filtration Methods 0.000 claims description 94
- 239000000654 additive Substances 0.000 claims description 90
- 230000000996 additive effect Effects 0.000 claims description 89
- 238000004873 anchoring Methods 0.000 claims description 66
- 230000009977 dual effect Effects 0.000 claims description 33
- 238000000034 method Methods 0.000 claims description 30
- 235000019504 cigarettes Nutrition 0.000 claims description 28
- 238000004519 manufacturing process Methods 0.000 claims description 17
- 239000007921 spray Substances 0.000 claims description 15
- 229920002301 cellulose acetate Polymers 0.000 claims description 9
- 238000005520 cutting process Methods 0.000 claims description 8
- 238000011144 upstream manufacturing Methods 0.000 claims description 8
- 229920000742 Cotton Polymers 0.000 claims description 4
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- 239000000839 emulsion Substances 0.000 claims description 4
- 239000006260 foam Substances 0.000 claims description 4
- 238000005304 joining Methods 0.000 claims description 4
- -1 polyethylene Polymers 0.000 claims description 4
- 230000000391 smoking effect Effects 0.000 claims description 4
- 229920003023 plastic Polymers 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 239000004698 Polyethylene Substances 0.000 claims description 2
- 239000004743 Polypropylene Substances 0.000 claims description 2
- 229920002472 Starch Polymers 0.000 claims description 2
- 229920000573 polyethylene Polymers 0.000 claims description 2
- 229920001155 polypropylene Polymers 0.000 claims description 2
- 239000008107 starch Substances 0.000 claims description 2
- 235000019698 starch Nutrition 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 25
- 239000000796 flavoring agent Substances 0.000 description 9
- 239000000047 product Substances 0.000 description 9
- 229910052799 carbon Inorganic materials 0.000 description 7
- 238000009423 ventilation Methods 0.000 description 7
- 239000004372 Polyvinyl alcohol Substances 0.000 description 6
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 6
- 229920002451 polyvinyl alcohol Polymers 0.000 description 6
- 235000019422 polyvinyl alcohol Nutrition 0.000 description 6
- NOOLISFMXDJSKH-UTLUCORTSA-N (+)-Neomenthol Chemical compound CC(C)[C@@H]1CC[C@@H](C)C[C@@H]1O NOOLISFMXDJSKH-UTLUCORTSA-N 0.000 description 5
- NOOLISFMXDJSKH-UHFFFAOYSA-N DL-menthol Natural products CC(C)C1CCC(C)CC1O NOOLISFMXDJSKH-UHFFFAOYSA-N 0.000 description 5
- 239000008187 granular material Substances 0.000 description 5
- 229940041616 menthol Drugs 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 239000004113 Sepiolite Substances 0.000 description 4
- 239000002775 capsule Substances 0.000 description 4
- 235000019634 flavors Nutrition 0.000 description 4
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- 229910052624 sepiolite Inorganic materials 0.000 description 4
- 239000004834 spray adhesive Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000005038 ethylene vinyl acetate Substances 0.000 description 3
- 239000012467 final product Substances 0.000 description 3
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- 239000003094 microcapsule Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910021536 Zeolite Inorganic materials 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000003957 anion exchange resin Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
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- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 2
- 235000013355 food flavoring agent Nutrition 0.000 description 2
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- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 0.000 description 2
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000010457 zeolite Substances 0.000 description 2
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 1
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- 230000004807 localization Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical class C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Images
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
- A24D3/02—Manufacture of tobacco smoke filters
- A24D3/0275—Manufacture of tobacco smoke filters for filters with special features
- A24D3/0291—Manufacture of tobacco smoke filters for filters with special features for hollow tipped filters, e.g. recess filters
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/02—Spray pistols; Apparatus for discharge
-
- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
- A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
- A24D3/02—Manufacture of tobacco smoke filters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
- B05B12/02—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling time, or sequence, of delivery
Definitions
- the present invention relates to filters and filter elements for smoking articles such as cigarettes.
- Recess filters are well known in the tobacco industry and provide a distinctive end appearance for cigarettes. They are typically manufactured by wrapping a continuous stream of filter segments at spaced intervals in a relatively stiff plug wrap paper. By cutting the filter stream in a region where no filter element is present, a recess filter can be obtained - the stiff plugwrap paper providing sufficient rigidity to enable the final cigarette to be manufactured and used without crushing the exposed paper end of the filter.
- Recess filters can incorporate one, two or more filter segments. It is often desired to incorporate activated carbon or other particulate additive within the filter. This is typically achieved through using a standard cellulose acetate (or similar) segment at the mouth end in order to present a plain white recessed end to the smoker, whilst a further segment closer to the tobacco column can comprise carbon (or other) granules interspersed within a fibrous matrix.
- a recess filter can include granular additive in a cavity positioned between two fibrous segments (one facing the mouth end and one facing the tobacco end of the filter tip).
- a recess filter may include a single segment which has particulate additive embedded within the segment; such 'Monogranular Recess' filters are disclosed in WO 2011/117584 .
- an internal anchorage or anchoring adhesive is invariably applied to the inside of the wrapper (plugwrap).
- the purpose of this adhesive is to prevent the plug of filter material from coming out of the surrounding wrap during subsequent handling or use. It is known to apply this anchoring adhesive in the form of a number (e.g. 2-4) of continuous lines to the inside of the plugwrap immediately before the it enters the wrapping garniture in a cigarette filter making machine, whereupon it comes into contact with the filter material and forms a cohesive bond with it. It is also known to apply this internal anchorage adhesive in the form of a continuous spray rather than by direct application.
- the anchorage adhesive may be, for example, be a hot melt adhesive or an emulsion-based (e.g. EVA, PVA or PVOH) adhesive.
- a characteristic of filter rods that contain activated carbon or other granular additives is that the granular material should only be located in specific areas that are separated from each other by areas of white fibrous filter material in which no granules should be present. The reason for this is that when these filters are eventually cut during cigarette manufacture, the cut is made through a white area so that only a clean white filter end is visible to smoker in the final cigarette. It is possible for stray carbon particles from the manufacturing process to become inadvertently entrained in the (white) filter material and/or in the surrounding wrapper material. If these particles become visible in the vicinity where the filter is finally cut, this gives rise to an unsightly filter end appearance. Such defects are termed 'Carbon Carry Over' (CCO) and, if the level of CCO is too high, the filters or filter cigarettes will be rejected.
- CCO 'Carbon Carry Over'
- a tobacco smoke filter comprising: a (e.g. outer) wrapper engaged around a longitudinally extending (e.g. cylindrical) core of tobacco smoke filtering material, wherein a first end of the (e.g. outer) wrapper is substantially flush with a first end of the core around which it is engaged, and a second end of the (e.g. outer) wrapper extends beyond a second end of the core around which is engaged to define a (e.g. tubular) cavity at the second end of the filter (or filter element); and an adhesive (e.g. anchoring adhesive) disposed (exclusively) between the (e.g. outer) wrapper and the core, wherein the adhesive (e.g. anchoring adhesive) is not disposed on the portion of the wrapper which extends beyond the second end of the core around which it is engaged to define the (e.g. tubular) cavity.
- an adhesive e.g. anchoring adhesive
- the radially inner face of the (e.g. outer) wrapper which extends beyond the second end of the core around which is engaged defines (e.g. with the second end of the longitudinally extending core) a cavity or recess, e.g. a tubular cavity/recess, at the second end of the recess filter (or filter element).
- Adhesive e.g. anchoring adhesive
- Adhesive is not present on the radially inner face of the (e.g. outer) wrapper which extends beyond the second end of the core around which is engaged; the cavity/recess at the second end of the filter (or filter element) is free of adhesive (e.g. free of anchoring adhesive).
- a tobacco smoke filter comprising: a (e.g. outer) wrapper engaged around a longitudinally extending (e.g. cylindrical) core of tobacco smoke filtering material, wherein a first end of the (e.g. outer) wrapper is substantially flush with a first end of the core around which it is engaged, and a second end of the (e.g. outer) wrapper extends beyond a second end of the core around which is engaged such that the radially inner face of the (e.g. outer) wrapper which extends beyond the second end of the core around which is engaged defines (e.g. with the second end of the longitudinally extending core) a (e.g.
- an adhesive e.g. anchoring adhesive
- the adhesive e.g. anchoring adhesive
- the adhesive is not disposed on the radially inner face of the (e.g. outer) wrapper which extends beyond the second end of the core around which is engaged.
- the present applicants have thus found that by modifying the way in which internal anchorage/anchoring adhesive is applied during the manufacture of particulate-bearing recess filters, a dramatic reduction in the level of CCO associated with these products may be achieved.
- the anchoring adhesive is applied, preferably by spray, in localised areas corresponding to the position of the filter segment(s); no internal anchoring adhesive is applied to the (recess) areas where no segments are present.
- a lap seal (to secure the wrapper in cylindrical form surrounding the filter material) will continue to be required along the entire length of the filter, including the recess area; however, as is well known, the lap seal joins the inside of one longitudinal edge of the wrapper to the radially outer face of the wrapper to secure the wrapper in cylindrical form surrounding the filter material, and the lap seal is not therefore an adhesive (anchoring adhesive) disposed between the (e.g. outer) wrapper and the core.
- anchorage adhesive may be applied (e.g. by spray) to the filter segments rather than to the wrapper, or the adhesive may be applied to both the wrapper and the segments. Application to the wrapper only is the preferred method.
- the filter further comprises an additive.
- the additive is distanced from the second end of the (e.g. outer) wrapper and/or core - e.g. such that it is not visible from the second end of the wrapper and/or core.
- the additive may be a particulate additive.
- the particulate additive may any particulate additive suitable for use in a tobacco smoke filter - 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 particulate additive may be a mixture of two, or more, materials.
- the additive may include a flavourant - e.g. menthol - e.g. the additive may be sepiolite granules to which menthol has been applied.
- the adhesive e.g. anchoring adhesive
- the adhesive is a hot melt adhesive or an emulsion-based (e.g. EVA, PVA or PVOH) adhesive.
- the (anchoring) adhesive may be disposed in localised area (e.g. as discrete patches or portions) positioned between the wrapper and the core. It is not essential that the patch or patches of internal anchoring adhesive are exactly the same length, size or dimensions as the filters/elements they are used to adhere, although clearly there should be a reasonable correlation.
- the width of the localised area (e.g. patch) is determined by the characteristics of the adhesive and the substrate, the strength of bond required and economic considerations.
- the localised area (e.g. patch) may extend across the entire width of the wrapper.
- the localised area (e.g. patch) extends over 20 to 40 % (e.g. one-third) of the width of the wrapper. It is preferred that the length of the localised area is the same as that of the longitudinally extending core of tobacco smoke filtering material. The length of the localised area may be shorter than that of the longitudinally extending core of tobacco smoke filtering material, for example such that the localised area of (anchoring) adhesive between the wrapper and the core is at least 1 mm from the second end of the core.
- the tobacco smoke filter may be of length 12 to 40 mm, e.g. 17 to 35 mm, e.g. 20 to 30 mm.
- the recess section of the filter (that is, the length by which the second end of the outer wrapper extends beyond the second end of the core around which is engaged to define the cavity at the second (e.g. mouth) end of the filter) may have a length 3 to 10 mm, and is most preferably of length 4 to 6 mm.
- the longitudinally extending core of tobacco smoke filtering material may be of length 10 to 30 mm, e.g. 14 to 27 mm, e.g. 17 to 25 mm.
- the tobacco smoke filter (or filter element) may be of circumference 14 to 28 mm, for example 16 to 26 mm, for example 16 to 17 mm or 24 to 25 mm.
- the final filter cigarette may be ventilated or non-ventilated and of any circumference range traditionally used in smoking products (e.g. c. 14 to c. 28 mm circumference).
- the wrapper (e.g. outer wrapper) may be paper, e.g. plugwrap paper, e.g. stiff plugwrap paper.
- the wrapper may be porous or non porous.
- the wrapper may be a paper of basis weight from about 40 to about 120 g/m 2 .
- the wrapper may be of basis weight from about 80 to about 120 g/m 2 , for example a basis weight of around 100 g/m 2 , e.g. for a recess filter of standard (c. 24-25 mm) circumference.
- the wrapper may be a plugwrap paper of a lower basis weight, e.g. around 50 g/m 2 .
- the wrapper is not transparent or substantially transparent.
- the longitudinally extending core of tobacco smoke filtering material may comprise one or more (typically, 1, 2 or 3) filter segments. If the longitudinally extending core comprises one segment and includes particulate additive, then the longitudinally extending core may be, for example, of any 'Monocarbon Recess' design discussed in WO 2011/117584 . If two or more segments are present, then carbon (or other particulate additive) may be entrained within a fibrous segment and/or present as a discrete granular layer.
- the longitudinally extending core of tobacco smoke filtering material may comprise a rod shaped core of tobacco smoke filtering material having fully enclosed (e.g. embedded) therewithin a (or at least one) pocket of the additive (e.g. particulate additive).
- the rod shaped core of tobacco smoke filtering material may optionally have an additional wrapper (e.g. porous or non porous) engaged around the rod shaped core.
- the provision of the fully enclosed pocket of the additive within the core of the tobacco smoke filtering material has the effect that the additive is distanced from the second end of the core (because there is tobacco smoke filtering material between the pocket of the additive and the end of the core).
- This type of filter may be referred to as a "Smooth Core" filter.
- the longitudinally extending core of tobacco smoke filtering material may have fully enclosed (e.g. embedded) therewithin a single pocket of the additive (e.g. particulate additive) close to the first end (e.g. the tobacco end in a filter cigarette) and remote from the second end (e.g. the buccal or mouth end).
- the longitudinally extending core of tobacco smoke filtering material may have fully enclosed (e.g. embedded) therewithin a single pocket of the additive (e.g. particulate additive) positioned equidistantly between the first end of the core (e.g. the tobacco end in a filter cigarette) and the second end of the core (e.g. the end of the core closest to the buccal or mouth end in a filter cigarette).
- the single longitudinally extending core of tobacco smoke filtering material may have fully enclosed therewithin one or more (e.g. two, three, four) separate pockets of the additive (e.g. particulate additive).
- the fully enclosed (e.g. embedded) pockets of the additive may taper towards one or both ends - e.g. may be of a generally ellipsoidal configuration. If there is more than one pocket of the additive, these may have even longitudinal spacing. Other pocket dispositions are possible - e.g. relatively close longitudinal spacing alternating with longer spacing - it being possible to achieve this by appropriate adjustment of the manufacturing process.
- the longitudinally extending core of tobacco smoke filtering material comprising a rod shaped core of tobacco smoke filtering material having fully enclosed (e.g. embedded) therewithin a (or at least one) pocket of the additive (e.g. particulate additive) may be manufactured, for example, by the methods and apparatus disclosed in WO 2006/059134 .
- the longitudinally extending core of tobacco smoke filtering material may comprise a rod shaped core of tobacco smoke filtering material and an particulate additive bearing wrapper engaged around the rod shaped core, the additive bearing wrapper having additive (e.g. particulate additive) adhered to one or more portion(s) of the radially inner face thereof with said additive bearing wrapper being free of additive around its circumference at the second end of the core.
- additive e.g. particulate additive
- the absence of additive at the second end of the additive bearing wrapper has the effect that the additive is distanced from the second end of the core (because there no additive on the wrapper at the second end of the core).
- the additive bearing wrapper is free of additive around its circumference at both first and second ends of the core.
- the longitudinally extending core of tobacco smoke filtering material comprising a rod shaped core of tobacco smoke filtering material and an additive (e.g. particulate additive) bearing wrapper engaged around the rod shaped core, may be a filter element as disclosed in GB 2261152 . This type of filter may be referred to as an "Active Patch" filter.
- the additive bearing wrapper may be porous or non porous.
- the additive may be a particulate additive.
- the particulate additive may any particulate additive suitable for use in a tobacco smoke filter - 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 particulate additive may be a mixture of two, or more, materials.
- the additive may include a flavourant - e.g. menthol - e.g. the additive may be sepiolite granules to which menthol has been applied.
- the additive may be a particulate additive such as activated carbon (see above), which is (for example) enclosed within the filtering material as a discrete pocket or pod of particles of particulate additive which is substantially separate from, and fully enclosed within, the filtering material.
- the fully enclosed (e.g. embedded) pocket(s) of additive may be a frangible capsule or capsules, or one or a plurality of frangible microcapsules.
- the capsule(s) or microcapsule(s) may contain a variety of media - e.g. a flavourant and/or a liquid, solid or other material e.g. to aid smoke filtration.
- the use of capsules or microcapsules is well known in the art.
- the longitudinally extending core of tobacco smoke filtering material may comprise a downstream (e.g. recess end) longitudinally extending cylindrical plug of tobacco smoke filtering material and further longitudinally extending cylindrical plug of tobacco smoke filtering material upstream of the downstream plug, wherein the further cylindrical plug includes an additive (e.g. particulate additive, e.g. activated carbon) located (e.g. dispersed) within the tobacco smoke filtering material.
- the further plug may be of the type referred to as an "Active Acetate" plug.
- the downstream (e.g. recess end) longitudinally extending cylindrical plug of tobacco smoke filtering material may include flavouring agent (e.g menthol). If the downstream (e.g.
- longitudinally extending cylindrical plug of tobacco smoke filtering material includes flavouring agent, it may be any type of flavour bearing plug (flavour thread etc.).
- the longitudinally extending core of tobacco smoke filtering material may comprise one or more additional longitudinally extending cylindrical plugs of tobacco smoke filtering material (e.g. upstream of the further longitudinally extending cylindrical plug).
- the (or each) additional longitudinally extending cylindrical plugs of tobacco smoke filtering material may optionally include additive.
- the additive in the additional plug(s), if present, may be the same or different to that in the further plug.
- the longitudinally extending core of tobacco smoke filtering material may comprise: a downstream (e.g. recess end) longitudinally extending cylindrical plug of tobacco smoke filtering material; and a further longitudinally extending cylindrical plug of tobacco smoke filtering material, wherein the further cylindrical plug is spaced longitudinally upstream from the downstream cylindrical plug; and a holding wrapper engaged around and joining the spaced plugs to define a cavity therebetween, wherein the cavity has an additive (e.g. particulate additive, e.g. activated carbon) located therein.
- the holding wrapper is generally an inner wrapper of plugwrap paper (and will be additional to the outer wrapper of the filter). However, the outer wrapper may serve as both outer wrapper and holding wrapper.
- this invention may also be applied to recess filters in which no particulate additive is present, for example flavour bearing, flavour thread, or shaped plastic mouthpiece filters etc..
- flavour bearing for example flavour bearing, flavour thread, or shaped plastic mouthpiece filters etc.
- the tobacco smoke filtering material may be for example any of those materials (usually filamentary, fibrous, web or extruded) conventionally employed for tobacco smoke filter manufacture.
- the filtering material may be natural or synthetic filamentary tow, e.g. of cotton or plastics such as polyethylene or polypropylene, or cellulose acetate filamentary tow. It may be, for example, natural or synthetic staple fibres, cotton wool, web material such as paper (usually creped) and (e.g. synthetic) non-wovens, and extruded material (e.g. starch, synthetic foams, extruded foams).
- the filtering material may be cellulose acetate.
- a recess tobacco smoke filter or filter element e.g. a recess tobacco smoke filter or filter element comprising a wrapper engaged around a longitudinally extending core of tobacco smoke filtering material, wherein a first end of the wrapper is substantially flush with a first end of the core around which it is engaged, and a second end of the wrapper extends beyond a second end of the core around which is engaged to define a cavity at the second end of the filter (or filter element) and wherein an anchoring adhesive is disposed between the wrapper and the core, wherein the adhesive is not disposed on the portion of the wrapper which extends beyond the second end of the core around which it is engaged to define the cavity]; the method comprising the steps of:
- the method comprises a further step of cutting the continuous wrapped rod (comprising longitudinally filter elements and/or multiple filter rods).
- the (e.g. individual e.g. pre-formed) filter elements and/or (e.g. pre-formed) multiple (e.g. dual) filter rods may bear anchoring adhesive.
- the (e.g. individual e.g. pre-formed) filter elements and/or (e.g. pre-formed) multiple filter rods in the flow are preferably aligned such that the longitudinally axes of their cylindrical cores are oriented along the longitudinal direction of the flow.
- the (e.g. individual e.g. pre-formed) filter elements and/or (e.g. pre-formed) multiple filter rods in the longitudinally advancing flow are longitudinally spaced from each other (i.e. each filter element/rod is longitudinally spaced from the next along the continuous flow).
- the method includes a further step of cutting the continuous wrapped rod in register with a position which is half way along each dual filter rod to provide dual product rods which each comprise two longitudinally extending cores of tobacco smoke filtering material which are longitudinally spaced from each other, and a common wrapper engaged around the longitudinally extending cores, wherein the anchoring adhesive is disposed exclusively between the common wrapper and the longitudinally extending cores.
- a method of making filter smoking articles comprising the steps of: joining a wrapped tobacco rod to each end of a dual product rod comprising two longitudinally extending cores of tobacco smoke filtering material which are longitudinally spaced from each other, and a common wrapper engaged around the longitudinally extending cores, wherein an anchoring adhesive is disposed exclusively between the common wrapper and the longitudinally extending cores; and cutting the dual product rod in register with a position half way between the longitudinally extending cores of tobacco smoke filtering material.
- the adhesive e.g. anchoring adhesive
- the adhesive is a hot melt adhesive or an emulsion-based (e.g. EVA, PVA or PVOH) adhesive.
- the width of the localised area (e.g. patch) is determined by the characteristics of the adhesive and the substrate, the strength of bond required and economic considerations.
- the localised area (e.g. patch) may extend across the entire width of the wrapper. However, it is preferred that the localised area (e.g. patch) extends over 20 to 40 % (e.g. one-third) of the width of the plugwrap. It is preferred that the length of the localised area is the same as that of the longitudinally extending core of tobacco smoke filtering material.
- the length of the localised area may be shorter than that of the longitudinally extending core of tobacco smoke filtering material, for example such that the localised area of (anchoring) adhesive between the wrapper and the core is at least 1 mm from the second end of the core.
- the anchoring adhesive is applied as a spray, for example a pulse spray.
- the spray adhesive system functions best when it is used with adhesives of low-medium viscosity.
- the adhesive has viscosity from 200 to 1000 cPS, more preferably 400 to 600 cPs.
- the spray can be applied in any suitable pattern within the localised area - e.g. as a single discrete patch, or as a series of parallel lines or in a spiral pattern.
- the adhesive is preferred to apply by spray, it will be appreciated that it is also possible to apply the adhesive by any technique for which a suitable control system exists for the application of discrete areas of adhesive onto paper, for example by brushes, rollers, printing, applicator guns, etc. Further, it is not essential that the patch or patches of internal anchoring adhesive are exactly the same length, size or dimensions as the filters/elements they are used to adhere, although clearly there should be a reasonable correlation.
- a recess tobacco smoke filter or filter element e.g. a recess tobacco smoke filter or filter element comprising a wrapper engaged around a longitudinally extending core of tobacco smoke filtering material, wherein a first end of the wrapper is substantially flush with a first end of the core around which it is engaged, and a second end of the wrapper extends beyond a second end of the core around which is engaged to define a cavity at the second end of the filter (or filter element) and wherein an anchoring adhesive is disposed between the wrapper and the core, wherein the adhesive is not disposed on the portion of the wrapper which extends beyond the second end of the core around which it is engaged to define the cavity]; the method comprising the steps of:
- the method comprises a further step of cutting the continuous wrapped rod (comprising longitudinally filter elements and/or multiple filter rods).
- the wrapper may bear anchoring adhesive in localised areas (e.g. patches) which correspond to the positions of the dual filter rods in the continuous flow.
- 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 the (wrapped) filter and rod to leave much of the filter wrap exposed] or, more preferably, by a full tipping overwrap (which engages around the full filter length and the adjacent end of the tobacco rod).
- the cigarette may include a tipping overwrap (of e.g. a stiff tipping paper) in conjunction with the outer wrapper of the filter to give the desired (e.g. further increased) stiffness to the final recess filter cigarette.
- 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 wrapper (plugwrap), and/or laser perforation of wrapper (plugwrap) and tipping overwrap.
- a ventilating full tipping overwrap may likewise be inherently air-permeable or provided with ventilation holes, and in ventilated products where both filter plugwrap and tipping overwrap are present ventilation through the overwrap will usually be in register with that through the plugwrap. Ventilation holes through a filter plugwrap, or through a tipping overwrap, or through both simultaneously, may be made by laser perforation during filter or filter cigarette production.
- Ventilation in a filter or filter cigarette according to the invention is localised longitudinally of the product, this localisation is preferably to one or two regions selected from upstream of, downstream of, and in register with the or a location (pocket or patch or portion) of the additive, depending upon the ventilation and filtering performances required. Ventilation upstream of and/or in register with a location (pocket or patch or portion) of the additive is frequently preferred. There may be ventilation between locations (pockets or patches or portions) of the additive when two or more locations are present.
- 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 schematically illustrates a recess filter according to an embodiment of the invention
- FIGURE 2 schematically illustrates a recess filter according to a different further embodiment of the invention
- FIGURE 3 schematically illustrates a method of making recess filters according to the embodiment of Fig 2
- FIGURE 4 illustrates an overview of a control system for a typical pulse spray gluing system for making filters of the invention, by methods of the invention.
- Figure 1 shows an 'Active Patch' recess filter comprising an outer wrapper 3 of plugwrap paper of basis weight 100 g/m 2 engaged around a (single) cylindrical longitudinal extending core of tobacco smoke filtering material 5 and held in place by a conventional lapped and stuck seam (not shown).
- the first end of the outer wrapper 3a is substantially flush with first end 5a of the core 5 around which it is engaged, and second end of the outer wrapper 3b extends beyond second end 5b of the core 5 around which is engaged to define a cavity 6, a recess at the second (mouth) end of the filter.
- An anchoring adhesive e.g.
- EVA is disposed on the radially inner face of the wrapper exclusively between the outer wrapper and the core, to hold the core in place within the wrapper.
- the anchoring adhesive is applied (see below) in such a way that adhesive is not disposed on the portion of the wrapper 3b which extends beyond the second end of the core around which it is engaged to define the (e.g. tubular) cavity; in other words anchoring adhesive is not present on portion of the wrapper 3b which extends beyond the second end of the core around which it is engaged to define the (e.g. tubular) cavity.
- the single longitudinally extending core of tobacco smoke filtering material 5 is an "Active Patch" filter element, such as are well known in the art, for example as disclosed in GB 2261152 .
- the core 5 comprises a rod shaped core 7 of tobacco smoke filtering material in the form of cellulose acetate tow, and an additive (particulate additive) bearing wrapper 9 engaged around the rod shaped core, the additive bearing wrapper 9 having the additive in the form of activated carbon granules adhered to a portion or patch 11 of the radially inner face thereof, with said additive bearing wrapper being free of additive around its circumference at the second end 9a of the core.
- the filter 1 is of 27mm length, of which the cavity 6, or recess, at the second end is of length 6mm.
- the patch 11 is centrally located between the two ends of core 7; the core 7 has both ends free of additive.
- the 'Active Patch' filter element may, for example, be made by the method disclosed in GB 2261152 .
- Figure 2 shows an example of a 'Smooth Core' recess filter.
- Figure 2 shows a tobacco smoke filter 101 comprising an outer wrapper 103 of plugwrap paper of basis weight 100 g/m 2 engaged around a single cylindrical longitudinal extending core of tobacco smoke filtering material 105 and held in place by a conventional lapped and stuck seam (not shown).
- the single longitudinal extending core of tobacco smoke filtering material 105 is a 'Smooth Core' filter, for example as disclosed in WO 2006/059134 .
- the core 105 comprises a rod shaped core 107 of tobacco smoke filtering material in the form of cellulose acetate tow, having fully enclosed (e.g. embedded) therewithin a pocket 199 of additive in the form of particles of activated carbon.
- the first end 103a of the outer wrapper 103 is substantially flush with a first end 105a of the core around which it is engaged, and a second end 103b of the outer wrapper extends beyond a second end 105b of the core around which is engaged to define a cavity 106, a recess at the second (mouth) end of the filter.
- An anchoring adhesive e.g. EVA
- EVA is disposed on the radially inner face of the outer wrapper exclusively between the outer wrapper 103 and the core, to hold the core in place within the wrapper.
- anchoring adhesive is applied (see below) in such a way that anchoring adhesive is not disposed on the portion of the wrapper 103b which extends beyond the second end of the core around which it is engaged to define the (e.g. tubular) cavity; in other words anchoring adhesive is not present on the portion of the wrapper 103b which extends beyond the second end of the core around which it is engaged to define the (e.g. tubular) cavity.
- anchoring adhesive is not present on the radially inner face of the outer wrapper 103 which extends beyond the second end of the core 105b around which is engaged; the cavity/recess at the second end of the filter (or filter element) is free of anchoring adhesive.
- the filter 101 is of 27mm length, of which the cavity 106, or recess, at the second end is of length 6mm.
- the pocket 199 is located towards the first or tobacco end of core 107, but it will be appreciated that core 107 has both ends free of additive (because it the additive is fully embedded within the core); the additive is invisible from the second or mouth end of the filter.
- the 'Smooth Core' filter element 107 may, for example, be made by the method disclosed in WO 2006/059134 .
- a continuous stream of longitudinally extending filtering cores of tobacco smoke filtering material are arranged appropriately (in a spaced arrangement) using a filter making machine, and fed through a wrapping garniture where a stiff plugwrap is wrapped around the filtering cores, and fixed around the filtering cores with a conventional lapped and stuck seam.
- a number e.g.
- FIGURE 3 schematically illustrates a method of making recess filters of the invention according to the embodiment of Fig 2.
- Figure 3 shows a continuous flow of spaced filter rods 115 advancing longitudinally in the direction of arrow 116.
- Each filter rod 115 includes two longitudinally extending cores of tobacco smoke filtering material 105 (see Fig 2 ) placed end to end in mirror image relationship. It will be appreciated that filter rods 115 are made by the methods disclosed in WO 2006/059134 , and that the line 117 between each pair of cores of tobacco smoke filtering material 105 represents the line along which the filter rods 115 will ultimately be cut to provide single cores 115.
- the flow of filter rods 115 enters a wrapping garniture (not shown) where a continuously advancing outer wrapper of stiff plugwrap paper 118 of basis weight 100 g/m 2 plugwrap is wrapped and around the longitudinally advancing flow of filtering cores and fixed using a lapped and stuck seam (as is well known).
- an EVA anchoring adhesive is applied to hold the filter rods in place on/in the plugwrap.
- the anchoring adhesive is applied by a pulse spray method, to the inner surface of the advancing plugwrap 118 exclusively in localised areas/patches 119 corresponding to those regions where filter rods 115 will be present, immediately before plugwrap 118 enters the wrapping garniture of the cigarette filter making machine.
- the advancing wrapper is then applied to the filtering cores by the garniture whereby the localised areas 119 of adhesive on the inner surface of the wrapper 118 come into contact with the filtering material of filter rods 115 to form a cohesive bond between the wrapper and the filtering cores.
- anchoring adhesive is not applied to the inner surface of the plugwrap 118 in areas (those areas other than localised areas 119) which will not come into contact with filter rods 15.
- anchoring adhesive is not applied to the inner surface of the plugwrap 118 in areas which correspond to spaces in the spaced flow of filter rods; these spaces will form the recess in the final product recess filters/recess filter cigarette.
- the wrapped filter rods 115 exit the garniture and are cut (along lines 117) into multiple filter rods.
- a rod including two filters is referred to herein as dual product rod (see Figure 3a ).
- the dual product rod 120 is joined at each end to a wrapped tobacco rod, and then cut along the line shown by arrow 121 to provide two recess filter cigarettes.
- line 121 represents a line half way along the spacing between adjacent filter rods 115 and thus the cut is located in the region where no filter (and no anchoring adhesive) is present; the cut therefore forms the recess at the end of each cigarette, and the final product filter cigarette has no anchoring adhesive present on the radially inner face of the outer wrapper 118 in this recess region.
- FIG 4 shows an overview of the control system for the pulse spray gluing system of Figure 3 .
- pulse spray adhesive applicator 201 applies the localised areas 119 of adhesive to the inner surface of the wrapper 118 immediately prior to entry of wrapper 118 into the garniture (not shown).
- Adhesive is supplied from pressurized glue tank 202 to pulse spray adhesive applicator 201.
- a pressure controller 203 controls the pulse spray air pressure in the applicator 201 and in the pressurized glue tank, to ensure an appropriate amount of glue is applied in localized area 119.
- a spray controller 204 (a microprocessor, a PC or similar) is used to control the number and size of localised areas, and to control the pressure controller 203 and pulse spray adhesive applicator 201.
- anchorage adhesive may be applied (e.g. by spray) to the filter segments rather than to the wrapper, or the adhesive may be applied to both the wrapper and the segments.
- application to the wrapper only is the preferred method.
- Recess filters were manufactured using standard filter making machinery as is well known in the art. These were cut into filter rods of 108mm length, each comprising 4x27mm length tips. Each tip had a 5mm recess, a 10mm downstream longitudinally extending plug of non-wrapped cellulose acetate filtering material facing the mouth end, and a further (upstream) longitudinally extending 12mm plug of cellulose acetate filtering material containing 30/70 mesh coconut-based activated carbon interspersed within the fibrous matrix at the end facing the tobacco column.
- the original set up of the machine was with a conventional system for applying internal anchorage adhesive as a continuous spray to the inner surface of the heavyweight (100gsm) plugwrap used to combine the segments and provide the rigidity for the recess mouth end.
- the measured CCO results for 10 prior art samples i.e. 10 lots of 640 tips) were as follows:
- the filter making machine was then modified in accordance with the invention, i.e. the internal anchorage adhesive was applied by a control mechanism such that localised patches of adhesive (corresponding to the position of where the fibrous plugs would be located) were sprayed onto the internal surface of the plugwrap.
- adhesive would be present over the 22mm length of the two segments in each tip, but absent from the 5mm length corresponding to the exposed recess end.
Landscapes
- Cigarettes, Filters, And Manufacturing Of Filters (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL13732893T PL2866595T3 (pl) | 2012-06-27 | 2013-06-26 | Filtr dymu tytoniowego |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB1211523.4A GB201211523D0 (en) | 2012-06-27 | 2012-06-27 | Tobacco smoke filter |
PCT/EP2013/063378 WO2014001388A1 (en) | 2012-06-27 | 2013-06-26 | Tobacco smoke filter |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2866595A1 EP2866595A1 (en) | 2015-05-06 |
EP2866595B1 true EP2866595B1 (en) | 2019-07-31 |
Family
ID=46704391
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13732893.6A Active EP2866595B1 (en) | 2012-06-27 | 2013-06-26 | Tobacco smoke filter |
Country Status (7)
Country | Link |
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EP (1) | EP2866595B1 (hu) |
GB (1) | GB201211523D0 (hu) |
HU (1) | HUE045905T2 (hu) |
LT (1) | LT2866595T (hu) |
PL (1) | PL2866595T3 (hu) |
RU (1) | RU2629869C2 (hu) |
WO (1) | WO2014001388A1 (hu) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TW201622590A (zh) | 2014-12-24 | 2016-07-01 | 菲利浦莫里斯製品股份有限公司 | 包含透明管的氣溶膠產生物品 |
GB201505515D0 (en) * | 2015-03-31 | 2015-05-13 | British American Tobacco Co | A composite web and method of manufacturing a smoking article component |
EP3340813B1 (en) * | 2015-08-28 | 2019-11-27 | JT International S.A. | Smoking article |
KR102229621B1 (ko) * | 2021-01-04 | 2021-03-18 | 강영봉 | 친환경 목화섬유를 함유한 담배필터 및 그 제조방법 |
WO2023144327A1 (en) * | 2022-01-28 | 2023-08-03 | Jt International S.A. | A pack of distinguishing aerosol generating articles and corresponding distinguishing aerosol generating article |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB809305A (en) * | 1956-02-23 | 1959-02-18 | Kurt Koerber | Improvements in filter mouthpiece cigarettes and the production thereof |
JPS59501892A (ja) * | 1982-09-30 | 1984-11-15 | フィリップ・モーリス・プロダクツ・インコーポレイテッド | フイルタ−シガレツト |
CH695306A5 (de) * | 2001-10-18 | 2006-03-31 | Jurop Ag | Filtervorrichtung mit Zigarettenpapier. |
GB0625818D0 (en) * | 2006-12-21 | 2007-02-07 | British American Tobacco Co | Smoking article filter |
GB0922698D0 (en) * | 2009-12-31 | 2010-02-17 | British American Tobacco Co | Filter for a smoking article |
GB201004976D0 (en) * | 2010-03-24 | 2010-05-12 | Filtrona Int Ltd | Tobacco smoke filter |
-
2012
- 2012-06-27 GB GBGB1211523.4A patent/GB201211523D0/en not_active Ceased
-
2013
- 2013-06-26 LT LTEP13732893.6T patent/LT2866595T/lt unknown
- 2013-06-26 HU HUE13732893A patent/HUE045905T2/hu unknown
- 2013-06-26 WO PCT/EP2013/063378 patent/WO2014001388A1/en active Application Filing
- 2013-06-26 PL PL13732893T patent/PL2866595T3/pl unknown
- 2013-06-26 EP EP13732893.6A patent/EP2866595B1/en active Active
- 2013-06-26 RU RU2014153260A patent/RU2629869C2/ru active
Non-Patent Citations (1)
Title |
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None * |
Also Published As
Publication number | Publication date |
---|---|
RU2014153260A (ru) | 2016-08-10 |
EP2866595A1 (en) | 2015-05-06 |
GB201211523D0 (en) | 2012-08-08 |
PL2866595T3 (pl) | 2020-01-31 |
LT2866595T (lt) | 2019-09-25 |
RU2629869C2 (ru) | 2017-09-04 |
WO2014001388A1 (en) | 2014-01-03 |
HUE045905T2 (hu) | 2020-01-28 |
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