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I i 1 ] ! I- REGULA~ UTILITY I 21130G~ $ I~ ........ ...... G OL~|~'~ =~$ j SUlDI'AASS ®*(:O//T~kU|i~G ~ITli,,,,~'~*e,,,,~,~.*,* -*.** eee )£R~r i {C / t°°,. ........ t .... - + ! J~ 0 r~ C: C~ C L~ BATCo document for Legal Services • Health Canada 28 November 2000

i / k TZTLE: FREE AIR DZLUTZON SMOKE rZLTER A~D ~t~T~OD AND A~PAKATUS FOR FABRICATING SAME ~,:O~"~ "" ~'"~h "- Richard M. Beryer "~ i0 15 TECHNZCAL ~ELD The present invention relates to fil~er elements and the fabrication Of such ~41~er elements. More p~r:icularly0 the presen~ i~vention r~lates to an improve~ air ~ilution tobacco smoke filterl Alt~)ugh the present inventioa is primarily concerne~ with pr~ucin9 filter meams re: cigar- ettes, It shou16 be note6 that the pr~uc~s of the preset invenSlo~ are generally useful as filters for any t~ba~co smoking means, whether they he cigarettes, Cigars, p~pes, etc. Since filters for Cigarettes have particular c~r- Cial importance, the embcdlments ~escribed hRrein relate tO the production Of filtered cigarettes. \ 2O BACKGRO~ OF THE INteNTION In fabricstinq ~Iters for use in Connection wi~h cigarettes and the iake, a number of different properties of the resultant ~ilter must be taken into considers=ion. W~ile filtration efficiency [4.eo, the ability ~f th~ filter to remove undesirable constituents fro~ toSac:~ Smoke) is perhaps the most important property of cigarette filters, ~iltr~ion efficiency m~st frequently be co:?~i- 1~/30/81 3338~5 1"%01 65.00CK • I2/30/S1 Z33~15 I 10~ 62.00OK S37&5 0~/18/~2 ~3381~ 08'-~?~2 ~ !0~ 4.00CH C' C~ C BATCo document for Legal Services • Health Canada 28 November 2000

10 20 25 )0 mised in order for the filtRr to possess a commerciall7 acceptable combination of other properties, includlng pressure drop, taste, ~rdnass, appearance, and cost. For ex~ple, the ~npst co.only utilized cellulose acetate fil- ter has a relatively low filtration efficiency since increased efficiency can only be obtained either by increa- sing the density of the falter material ~r the length of the element, both of which produce a pressure dr~p across the filter which is excessive end u.nacceptable from a commercial stand.int. In recent years, air dilution has ~ec~me a popular technique for c~pensatlng for the ~e.latively low filtra- tion efficiency of cigarette filters having a sufficiently low ~ressure drop for commercial acceptance. The air diluation technique employs sir to dilute the smo~e stream from the cigarette and thereby reSuce the ~ua~tity ~£ tar and other undesirable tobacco mmoke constituents drawn into the smoker's mouth ~nr each puff or draw. The air is generally provided thrDuph a plurali=y of perfcratlans" at the tipping paper employed for joining the filter to the tobacco coltum~ of the cigarette, and if the filter Is overwrapped with plu~ wrap paper, an alr pervious plug wrap paper is e~loye~. Alternetlvely, a/r-impervious plug • .wrap paper may be employe~ and grooves for?ned in the air impervious plug wrap paper .to provide passages of air ~he ~m~kerms mouth. The demand for low tar elga.Te=t~s has bec~ a major portion m[ the cigarette b~siness ~%£, therefore, the sir diluti~, techmlgue has bec~e a pri~.--.rily important approach in achieving I~ tar lowers. As no:e~ abowe, however, all prAer art air dilution f~lters ezploy either perforatei air-impervious tipping paper O~ porous tipping paper tO ) £ ) % % C~ 0 BATCo document for Legal Services • Health Canada 28 November 2000

...:. f [ I I J i0 15 20 25 3O permit air to flaw through the tipping paper an~ either into the main smoke stream =r along a qrocve define~ in the z~ periphery. Zn t~se pri@r art ai~ dilution filters, the ultimate cantr~l Of tar delivery is dependent upon the unifozmity of the perfozatio~ in the tipp~nq paper or the porousity of porous tippinq peper should that be use~. Xt is ~esirable to eliminat~ this ~ependense upon the charac- teristics Of the tippln~ paper. S~R¥ OF THE Xh~ENTIDN Xt a primary object of the present invention to pro- wide a ciqarette a~d/oz cigarette filter wherein air dilu- tion can be eccuzately ~ntrolled without ~epen~ence ~pon porous tipping peper O~ pezfczete~ tipping paper. ~t is as other object of the present invention to provide a low cost approach to filtering cigarettes with ~he air dilution teckaique. ~t is still another ~bject of the present invention to provide an ineMpens~e a~r dilutlo~ ~m~ke filter with- out the ~se of porous tlppi~g paper or tlppin9 paper ha~in~ pzescribe~ ventilation holee ~efinea therein. Z~ accordance with the present invention, qrooves.~ a~e defined in the p~rlpherM of the filter an~ are main- tai.ea open to ambient alon~ their length. These ope. g~ooves extend tO the smoke aischar~Ing end of the filter an~ therefore ~e!Ivaz ai~ into the smoMer's mouth with each puff° ~n one sm~iment, th~ grooves ere d~in~ in the falter rO~ an~ the tipping paper. Xn thi~ embodiment, the filter rod can be pro-grooved &nd the tipping paper applied usin~ a vacuum system which causes the tipping C_D C~ C BATCo document for Legal Services • Health Canada 28 November 2000

/ J i 10 t L~ i°i 15 ;l 25 L paner to ¢c'nfc.-m to the pre-groove~ Eilter configurations; al".ernatively, the tipping paper can be applied to the filter and cigarette, after which the grooves are forms~- in the filter a~,¢] tipping paper sim%~ita~eouslv. ~n second embodiment, an air-Impervious plug wrap is employed an~. the ~rocves may be foz~ed in the plug wrap and filtAr simultaneously, or the plug wrap may be applied by a vac~ application technique whereby the plu9 wrap c~nforms tc the pro-grooved filter ro¢~. This second embodiment employs only a ring of tipping paper to secure the fil~er to '~-~s cigazette at the juncture between the filter rod and the tobac=o rod. BR.~K'F DESCRIPTION OF TKE DRAWXNG3 The ah<)ve and still fur%her objects, features, ~nd advantages of the present invention will become apparent up3n consideration of the following detailed description of the specific embodiments thereof, especially when t~en in conjunction with the acc~anying drawings, whereins Figure I is a view in perspective Of one form of ci~sre~%e pro~:cs~ i~ accordance wi~h %he presen~ intently,, the tipping paper being pa~tlally torn away for illustr~tive ¢lar~:y: Figure 2 is a view sim/lar to that of Figure i ~ut illus:~ati.~ a se~en~ for~ of cigarette ~tod~ced in acc:r- d~ce with the ~resen~ invention; Figure ~ is a view simi:ar to that Of Figure i hut illus:r~tin@ s third form of cigarettes produced in acr:r- danc~ with the present in~en~ion; C ~0 CO CD --4 BATCo document for Legal Services • Health Canada 28 November 2000

I0 15 2~ 25 30 Figure 4 is • Jew similar to that of Figure I but illustrating a fourth ~orm of the cigarette produced in accordance with the present invention; Figures 5, 6, 7, 8, 9, 10, a~d ll ere different possible end views of cigarettes of the forms i11ustrated in Figures I, 2, end 3, show£ng t~ dlffeEent number of grooves which can b~ provided in the outer periphery of the filter. Dr~SCP/PT~C3 Or THZ P~ERRED E~ODIME~T Referrin9 to the a~wings with greater specificity, and particularly to Figure i,.a filtere~ cigarette accor- din9 to the present "Invention,s generally designated by the ~efer~nce numeral i~. Cigarette I0 I/~.cludes a t~bacco • r~il/ an~ a filter element 14 eon_stzuc1:z~ in accordance wt~h~ane embodlz~nt ~f the present ~uention. A tipping. owaL'w~a~ 15 lecures the tobacco E~ 12 and filter element ~4 "in.end-to-end relationship in accordance with well kncwn ~echnlques in Chls fleld. ?ilter 14 is a generally cylln~ricel plug of ~onventlonal tobacco smoke f£1te~ m~terlal and typically is made Er-m contln~ous tow of cellulose acetate filamentary ~at~rial: it should be noted, however, that other filteri~ =at~r~al may be employed with slight modifications. F~r example, filamentary tow formed of other meterlals s~k as polyethylene, poly- propylene, anS the like~ or ev~-n :on-woven staple fibers may be ~se~. Zt s.%ould be ~n~er~tood, however, that oellulose acetate" filamentary :¢~" is the preferred material from s commercial s:andpoint. In this aense~ filter plu~ 14 is fabric&te~ ~r0m co,veet~nal material to function ~ e smok~-per-~ous filter plug f~r %rappin~ solid particulates . o .% C CD C~ CD BATCo document for Legal Services • Health Canada 28 November 2000

) I0 15 2O 25 3O in the smoke passing therethro~gh. ~nlike ..-~.ny conventional air dilution filters, filter plug 14 is not circumscribed by a non-porous or smoke-im- pervious p~ug ~rap between t,~e plug ~nd tipping paper 16. R~thar0 the air-L~pervious tipping paper 16 is applied directly to the plug 14 and • portign of tobacco rod 12. Tipping paper 16 circ~mscribga filte= plug 14 along the enuire length of the piug~ There are no ventilation holes provided in tipping paper 16 SO that ambient air cannot enter the filter plug through che tipping paper 16 nor can smoke from the plug 14 egress through the tipping paper° The tipping paper 16, in addition to securing the smoke receiving end of plug 14 to one en~ of tobacco rod 12 in concentric end-to-end• relatlon, also serves to conduct ambient air into the smoker's mouth which each puff on the cigarette. Speci~ically, the ~iagramm~tie Eepresentation of plug 14 in Figure 1 shows the tlpping paper 16 partially tor~ away. This is to represent the fact that the plug 14~ for the embodiment Of Figure l, Is not grooved prior to application of the tipping paper thereto. In other ~r~s, a plurality of 9Tooves 18 are defined longitudinally in both the tipping paper 16 end plug 14, ~t are defined after the tipping paper is applied and the complete clgar- ~tte assembled. Grooves 18 are open to Rmblent along their entire length and extend from a predeterm/ned point along the ~ength of plug 14 to the smoke dlscharging end of the ~ilter. In other words, after the cigarette has been made and cut, qrooves are planed in the outside O~ the tipping ~aper, tO a depth in plug 14, in accordance with the exact amount of dilution desired. The nu~ber Of angularly spaced grooves 14 is also determined by the amount Of dilution ~esired. As noted, the grooves extend fr~:~ the smoke dis- C bO CD CO BATCo document for Legal Services • Health Canada 28 November 2000

I0 15 2O 25 3O charging end of the filter to a length sufficient so that the smo>er'e lips will not normally extfnd longitudinally beyond the length of the q~ooves. For example, the grooves can extend the e~tire length'of p1~ or rod 14, cr some shorter ~istance, as desired. Thus, the clgaze%~o i0 of Figure i can be fabricated by any conventional method end apparatus and, after it is fabricated, passed ~hrouqh • crimping mechanism to fo~ @rooves 18, as desired° %t is important to note that thQ grooves 18, Tether than being covered so that access is provided through a porous material or through ventilatlo, holes, is cpes alo.g its ~ntire length. Since the @roowes azs recessed with respect to the cuter psrlphery Gf 1~he tlp~in~ paper, the @reeves provide passages through the llps of t/~e s~ker which an~aga the Outer periphery of ti~pi~%@ pa~r 16. These passages conduct air into the ~th of the smoker with each puff Or ~raw a~ the Brooke ~ischa~in~ end of the filter. The absence of ba~Tiers or reotrlctloes to the flow reduces flow impedance as compared to prior a~t dilu- tion filtors and ~heroby pez~/ts better =ont.roI Of the air dilution technics, Xn addition, since the plug wrap normally disposed between the tlppln~ paper and the f£1ter re4 is eliminated, the clgerette i0 is simpler and Zes~ costly to manufacture° As described, in the fabrication of cigarette I0 of Figure 1, the grooves 18 are formed slmultaneously in filter rod 14 and tipping paper 16. In clqarette 20, illus~ratod in Figure 2, fil~er'rod 24 is pre-~rooved wi~h grooves 28 before app~Icatlon of the tlppi~g paper 26 to sec~rs tobacco 22 ~o the filter rod. In order te aesuce tha~ the tipping paper 2@ conforms to the ~rooves ~8 in the fllte= cod, s vacuum system iS employed as part of the - ? - p-- CD 03 BATCo document for Legal Services - Health Canada 28 November 2000

I0 is 20 25 3O - ) tipping wrap m~chi.~e to draw a vacuum upon the completed ~i~a."ette h~fore the adhesive has 6rledo In this man~e~, the tipping paper is force~ to conform to the Fre-~rooved periphery of filter rod 24. With respect to the appearance of the fisal prOduCt to the nak~ eye, cigarettes I0 add 20 appear identical. Cigarette 20 functions in the s~me manner as cigarette 10 so that the -~roo~s 23, to which tipping paper 26 confo:ms, conduct air ~irect!y into the mouth of the smoker wi~h each puff a%ong with smoke filtered through rod 24. A~other ¢~@a~e~.te ~bo~Iment 30 Of. ~he present invention is illustrate4 in Figure 3. TObacco rod 32 ks secured in 9-d-t~m-en~ relatlon with filter rod 34 as in ~he embo4 ~ents Of Figures I and Z. However, filte~ rod 34 ~ .~Cumscri~ed alo,g its entire length by e non-poreua or smoke-impervious plug w~ap 35. It wit% be recoc/nized by those familiar with this ar~ that ~he ~meke-lmpervious plug wrap includes smo~e-lmpez~i~us outer surfaces of fo~me&l mate-'lal which are integral with the filter plug as ~i! as Smoke-lmpervious wrapping material, which is not integral with the filter plug. Plural grooves ~8 are ~efined in the plug wrap 35 an~ pi~g ~4 and take the form of recesses having their depth dimensi~ extending ra~islly ~nward from plug 34 a~d their length dimension extending from the smoke ~ischar~ing a~d to a length sufficient to avoi~ the entire length of grooves ~ bein~ disposed in a £moker's mouth during use. A rln~ of t~pping paper 36 is dispose~ about the J~not~o, h~tween the filter rod 34 ~nd tobacco rod }2 ~o ~oin the t~ rods t~ether. Ti~pin~ paper ~6 ~iffers from tlppin@ ~aper 26 an~ tipping paper 15 in that it is much shorter in axial length and is not ~rooved. Rather, the grooves 38 are ~eflned in the smoke-- impervious plug wrap ~5 an~ extend into the filter 34~ as CD Oo m BATCo document for Legal Services • Health Canada 28 November 2000

% i I0 15 2O 25 ~0 described. Air di!uti~n is effected in cigarette 30 in the same ~nner described above for ci~a:et~es i0 and 20 of Figures i and 2, res~ct~veiy. Specifically, gcooves 38 in the plu9 wrap 35 are e~posed to a.~'~ient and provides passages passed the smoker's lips and into the smoker's mouth. A~ient sir is therefcre drawn into the smoker's mouth with each draw Or puff so that the ambient air enters in parallel tO the filtered sm~.ke p41ssing through the smoke discharging end of the filter and int~ the smoker's mouth. Al~hou~h cigarette 30 employs a plu~ wrap whereas the plug wTap is slimlnat~ in cigarettes 10 and 20, the savings on the amount of tipping paper employe~ may, in some cases, make up the d~fference "in cost. Horeover, sinc~ normal tipping paper is plao~d directly ~ the ~outh, the requirements therefor are ¢onalderably more stringent than would be the case in the simple zing tipping paper appli- cation for cigarette 30. ~n Other words, less expensive material can be used for tipping paper ~6 and for tipping papers 16 and 26. Referrln~ now to Figure 4 of the accompany drawings, another cigarette emb~iment 40 is illustrated i~ accordance with the present-invention. Like elqare~te ~0, a tobacco r~ 42 Is jolne8 to a ~ilte= rod 4~ which has piug ~r~p m~terlal 45 circumscribing its entire length. A ring of tippin~ papers 4& covers only a S~r~ length Of both the filter rod and tobacco ted to ~oi. the two end-to-end ~n concentric relation. Filter z~d'44 and plu~ ~:ap 45 are contoured to the shape of a cigarette holder An the manner described in my copendin~ ~.$. P~tent Applicati~ S~rial No. , filed ¢m ~,~,~.~ou~):uk-~ ~, , and entitled "~mprove4 Tobacco Smoke Filter Contoured To Provide Dndiluted Air Flow And Method Ar~d Apparatus For . g. o . 2~ ~J CD CO f~J BATCo document for Legal Services • Health Canada 28 November 2000