Tobacco Documents Online

• ° p-. ,,, UK Patent Application ,,, GB ,,,, 2 175 78 ~ A lit1 ApiIIIc~ I~Io 8612,7,35 ~2.1 0ii,~ ot t~ 20 ~ she, (.~Q| P;~llity dill 13tj I S 13~?,33 (321 24 May 1N6 {331 Gii (431 ~ m~shed 10 Oe¢ I~RC; |711 A;li~Im Britisi~.Amerkln Tobacco ~ Llndtl<l (Unltad Weiln~tIr I~ 7 MHJbm411k~ ~ SWlP 3JE {;2l i~,,maor Jo~n Am,bony luke |741 AgenS end/or Addro~ k~ $endce K. J. )4. Maelemlo BAT IUK end E~pomll Umlted. Patents Sectkm, Resun=h i. Olrve,iopllt, lml Ctntrl. Roglnll Pl~rk Road. SouUvm=ptoo 509 1PE (611 IHT C3." A240 1/90 [62) D~nesl~ =bu~=mion tEd~w HI: A2C 28 (66) Documims C~Led flcme (56) F'~ld ~ lea~h A2C r~Jou4d US wnilicsti~i ~ II'C wb-W. J~.,;O 154,1 |mprovemiiItl relating Io smoking articles ~Ts A cigarette comprises a tobacco rod of tobacco filler wrapped in I paoer wrapper, the citcumlerencr. of tile rod being within a range of 10 rnm to 19 mm and the free burn rate of the rod being withi, a r;+,,,r," o( 25 to 45 mg rain '. The cigarette may cQrngrist considerably hiss tobacco than a cigaretui or otth~l,px circurnierence yet yield an equld or greater number of puffs. ~.J I,O Ill '~J Of ('.+'I On {,.)'I CIIbPDF - v,vww.fastio.com

LUOD'O!]St~I~"A'~'~'Ak','~ - JC]cIq![O 0 GSL~LTZ III

GB 2175 769A I SPECIFICATION Improvements relating to smoking lulJclas 5 ~is invention relates to cigarettes and like •,making articles. 5 IL is a requisits of cigarettes of comn~rcinUy acceptable quality that when lit but riot being smoked, the co~d continue• to burn. at 8 slow rake, a condition usually referred to as smouidor- i.g. A number of cigarette design parameters affect the smoulder rata, otherwise known as the free or static bum rate. One of ~osa is the air penn•ability of the cigarette paper; the lower the 1U air permeability, the lower is the i.'nouider rote. Another |actor relating to &moulder rata i• the 10 amount of tobacco which i• consumed in unit time. It hoe previously been thought that for Im acceptable linear smoulder rate. a minimum amount of about 60 mo of tobacco had to be co,lsumed per minute in order to assure the maintenance in the coal of enough heat to sustain the coat in its smouldering condition. This factor has heretofore been seen to make it necessary 15 h)r a cig•retts rod of the usual c~rcuJar ~rosa section to have • circumference of at least about 15 22 n~. if the cigarette wee to smoulder in • reliable manner. The present invention provides a cigarette comprising a tobacco rod which rod comprises a tobacco l',tler and a paper wrapper, the circumference of said rod being within a range of 10 mm is 19 ram. preferably 12.5 mm to 19 ram, and the free burn rote of said rod being within e range of 25 to 50 mg man" '. prelerably being within a range of 25 to 45 rag man-', and more 20 i)relerabJy witldn • range of 30 to 45 mg min-'. Ti,e present invenbon is based on our rmding that in point of fact cigarettes having circumfer- ,.~co• el 19 mm or less and free burn roles of 45-50 mg man 1 or less smoulder in • fully acceptable manner and that in addition such cigarettes exhibit a number of significant practical 25 a(Jvantages. 25 There is no necessity in order to provide cigarettes accorc~ng to the present invention which smou|der reJ~bly between pulls to make compenr.ato~ JKtju•tmenre to the cigar•lie paper air i-.meab~lity value or to provide the cigarette paper with unorthodox levels of bum rate promot- J.!l addilive•, or in fact Is make compensatory adjustments in regard Ks any other i~u'ametsrs 3() which affect •moulder rate. 30 The packing density of U~ rod may be within s range of 150 mg ¢m 2 to 350 mg cm ~. and preferably widlin a range of 200 mg orn ~ to 300 mg Km ~. Cigarettes according IS the present invention utJiise tobacco with increased afrcJency. Thus • cigaretts may be provided according to the present invention which, compared with a cigarette 35 el orthodox d~nensions, hav~ng, for example, a circumference of 25 ram, comprises cons~dersbJy 35 less tobacco. 25% less for exempts, and yet which provides an equal at least number of pulls. The actual number of puffs, w//l. of course, by dependent inter alia upon the length of the c~qorette tobacco rod. For unit length of tobacco rod. the reduction in the cigarette paper requirement is, leaving the 'f;O Io..qitudinal lap •sam out of account, directly pro0ortional to rod diameter reduction, whereas the 40 reduce(on in tobacco requirements is. assuming constant pecking density, in proportion to the ratio of the squares of the diameters. Thus in unit tength of a cigarette according to the present invention the ratio of mess of cigarette paper to mass of tobacco is higher than that for a r.k'joretto of conventional circumference st equal pecking densities. Thus in cigarettes according • 1!; Is (he present invention, exception•fly firm ash formations are obtsmable. 45 In that cigarettes may be provided according to the present invention which contains loss tobacco than orthodox ciga~ettss at equal puff numbers, cigarettes according to the present i.vontion exhibit lower smoke component mainstream and aid•stream deliveries. I! I~os been observed in comparing cigarettes according to the present invention with Orthodox ~|) ckjorettes of at the same number of cuts per inch. thee the cigarettes according to the present bU ,we,,tion are ui firmer feel than the orthodox cigarettes. In other words, the same filler in the h,vantive cigarettes apparently has e higher filling power than when it ia in¢orpordted in orthodox ¢:nl;lKe||os. II is surmised that tl~x phenomenon may dodvo from the inP.Jeese in the ratio or the ..~jn particle size of the filler to the cross-saclional are8 of the tobacco rod. It does mean !,:, |hough that for equal filling power values, a reduction in tobacco weight may be made over and 55 ub~ve that resulting directly from the reduction in tobacco rod cross-sectional area. Freferabiy. c~arettes according to the present invention are such as to provide 5 to 15 puffs. a~KI more preferably 5 to 10 puffs, when smoked under standard machine amoldng ¢ondit/ons. ie. a; 35 cc puffs of 2 second• duration el 1 minute intervals. t~0 The tobacco filler may comprise expanded tobacco, reconstituted tobacco or substitute smok- 60 i,~o materials. The tobacco rods atr cigarettes according to the present invention may be of a class-section other than round. They may, for example, be of elliptical or rec~inear cross- sLy|ion. If cigarettes according to the present Invention'ere fitted with filters end the filters are of the ;;~ same transverse dimensions aa the tobacco rods, there will be • saving in filter material G5 C:) U'l U'l r~ C~ ClibPDF - www.fastio.com

& 2 • " GB2175 769A :' r•quirarmmta comp~ed with those of orthodox f'dtar Upped cigarette•. It may be observed in reistion to the conventional form of filter comprising cellulose acetate, that a reduction in cellulose acerata tow udllsatlon can b• affected without there necessarily being a change in pressure drop in going from orthodox falter circumferences to circumferences appropr~ta for 5 |iitars (or attachment to cigmlttlm •coording to the Wesent Invention. " For constant pressure drops end for unit length of filter the tow requirement is. in loci. reduced by an amount in excess of that suggested by the ratio ot the aria• of conventio.~ m.i inventive cigarette. By use of the present invention •ignificent reduction• in packaging material requkemenl• I~. 10 unit cigarette may be reelised. |" A cigarette in accordance with the present invention is •hewn in the accompanying diatj~amn- rnadc clrawing and is generaJly de,geared by reference numora) 1. The cigarette 1 comprises cigarette paper 2 wrapped about • cut tobacco rdler, to provide • tobacco rod. an end portion o! which filler is referenced 3. C~garette 1 further comprises • dpping wfapper 4 which serves to 15 maintain a filter, of cellulose acetate tow for example, in abutment with the and of th• tobacco 15 filler remote end 3 thereof. The overall length of ¢igaretta I is 120 mm sad the dJsaltar is 5 mm. Cigarotral in accordance with the invention were made having tobacco rod lengths of 100 mm to wl'dch wore attached 20 mm long filtwe. These cigarette• were made in l~vo ¢ircum(erences, 20 15 mm and 17 me. th• cigarettes being designated A and B respectively. Under stsadatd 20 smoking conditlorm, measurements were made of the total deliveries of mainstream smoke particulate matter, on o water •rid nicotine free basS•, end of total nicotine ~dkaioida. By way of comparison, similar measurements were mad• for an orthodox commercially marketed ciger•tto of 25 mm c~rcumlerence end having tobacco rod and filter lengths of 64 mm and 20 mm 25 respectively. The results are is elmwn in the table below. 7!) 3O 35 4O PXWNF (m¢) ¢~A (mg) PUFF NU~BEE TOBACCO WEIGHT (mE) 9.6 0.8I 8.2 325 B 16.0 ,1.34 13.8 65O ORTHODOX 14.5 1,26 9.3 884 3¢) : The table clearly bxlicams the effectiveness of the present invention in udlising tobacco at a,t increased isv•l of ef[icieccy. Tobacco fill•re used in cigarettes according to the present invention may be of conventional 45 cuts per inch or above or below the convenbonsi range. • ,II 1 4!, CLAU~IS 1. A cigacetta comprising • tobacco rod which rod comprises • tobacco ~ and a paper wrapl~ar, the circumterence of zMdd rod being within • range of 10 mm to 19 mm and the free 50 burn rate of said rod being within • range of 25 to 50 mg min-% bt,) 2.. A cigarette ea ~aimod in Claim 1. wherein raid circumference is within • range of 12.5 mm to 19 nm% 3. A cigarette as claimed in C~aim 1 or 2, wherein said free burn rate i• within I range of 3U to 45 mg rain-'. 55 4. A cigarette Is clsimed in Claim 1. 2 or 3. wherein the pecking density of said tobacco 55 filler is within • range of 150 mg cm"s to 350 mg cm '. S. A cigarette as claimed in Claim 4. wherein the packing density of said tobacco rigor is witl~ a range ot 200 mg ca'" to 300 mg orn ~. 6. A cigarette as claimed in any one of the preceding claims and further comprising a later of 00 Iha some transvers• dimensions es said rod. I ,, 7. A cigarette as claimed in any one of U~e preceding claims, the tobacco ~k~r of said rod thereof comprising ;It least 25 par con1 less tobacco than tlmt of an equal length rod of a control cigarette of 25 mm ci~umfel'enc0, the number of puffs provided by raid cigarette bei, tj C) 0 (J~ tn ClibPDF - www.fastio.com

C:~2175789A 3 n~.hine unoldng ~)ndidon#. g. A c~oenno as claimed In ~ 8 gMng 10--15 puffs. 10. A ciganetl~ substandeJ~ es hominl)ofore descra~d widl reference to the drawing hereof. C3 O L,n L~4 O,) ClibPDF - www.fastio.com