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RESEARCH AND~DEVELOPMENT, NEUCHATEL - QUARTERLY REPORT DIVISION . NEW PRODUCT DEVELOPMENT SUBJECT TITLE . STUDIES AND MODELLING' PERIOD COVERED : JULY - SEPTEMBER'19!88 WRITTEN BY . BADERTSCHER-T (TBA) KEYWORDS . spade,tipping,plugwrap,ventilationI PROJECT SPADE - NO 8504 Objective Predict the filter material to use (tipping and plug wrap) to obtain the ventiiationilevel calculatediby the cigarette model. Status The air-permeability of tipping/plug wrap combination AnaloGous to Ohm's low of electrical resistance (ref 1) R' = R i (Seriall) 1 J = U U1 + U2 J1 J2

RESEARCH AND D: VELOPIIIENT', NEUCHATEL - QUARTERLY REPORT' the permeability of a tipping/plug wrap combination can be calculated as follows : A pO P where Pcomb = permeability of the combination tipping/plug wrap [ CU ]' A p~ = pressure drop at which the permeability was measured P.. = permeability of the tipping paper [CUi] t-pp Ppw = permeability of the plugwrap [CU] The pressure drop 61p. is always 1b:Pa (standard method). R ¢ d Pcomb ,-A PO + A PV, Ptipp Fpw P • P pw' Ptipp + Ppw = permeability of the combination o< = correction factor ~ can be considered as "machining factor" or "contact factor". The parameters which influence rC are manifolcd e.g,. : - hole size and geometry of the tipping paper (active surface). - roughness of the cont act surfaces oi tipping/plugwrap. - giue type, viscosity, temperature. - appliedpressure on tRie tipping/plug wrap at the filter assembler. Combined permeability - ventilationi For seveial of our brands the P values were calculated'using the specified values of tipping pap4r and plug wrap permeability and considering the correction factor := 1.

RESEARCH AND DEVELOPMENT, NEUCHATEL - QUARTERLY RhPORT These vUlues were plotted versus the according to the formula reported in (ref. 2)'. Q",ent Q~-vaiues calculated' tFie last Quarterly Report 0.118!2 + 1.2192 • 24 - 0.3498• Jp` The analytical values (RTD cigarette, RTD filter and'ventilation) used to calcuate Q~d, are the mean values of =our months' product mon~i toring, repcrt~d by the Munuf acturing Services Group (riSG) . These graphs are shown on fig. 1 for electroperforated tippingss and medium porous (~24'00i CU)' plugwraps and fig. 2 for electroperforated and microlaser tippings combined withi high porous (9500 CU) plug wraps. Both curves have more an enponential shape than, the I to 1 graph expected, due to mainly two reasons : a) the formula used to calculated the pressure drop across the vents, i.e. pv, pup • (1-D) _ A puP coa~;iciers only the axial pressure drop along the cigGrette but no~;~ the raeiial pressure dT cp and aoes not exact i:~z represen z the pressu-_-e ulrcp over the tipping/piugg wrap. The previously mentioned correction factor __c ~rn example is she;wn or 2(points 3I•, and 6M,) . These are tWo. mi crolaser pcrforattc] tippings having the, came permeabilityy and same hole size but in : a) 32,: b ) 6i•1 3 rows 6 rows Thepaper with 6 rowsqiveshigher Q values(ii.e. higher ventillations) . See in, tha.s context a~so ref. 3.

kESEA12CH AND DEVELOPMENT, NEUCHATEL - QUARTERLY REPORT Correlation:i a) Electroperiorated tippings combi:ned' withimedium porous plug wrap. A goo(Iccrrelation between Q~ and P0 was obtained~in the form kr- P~ = 1.229 • ~'Q~ - 0.7358 r2 = 0.996 or P¢ = 0.4791 • Q0 1.229' With this correlation the tipping paper permeability can be predictecd satisfactorily for practice without knowledge of the correction factor oe . The range of permeability covered is from 42'.5 CU' (Z3/10) to 510 CU ('Z4'/120). B)i 1;lectroperforated and Microlaser perforated tippings combined w~ith high porous plug wraps. More results will be necessary to obtain statistically siGn;~ficant ccrr~clations and with the number of rows as additional paran;eter for Microlaser perforated tippings. Pl«its - t•;anuiacture prototypes with a tilter rod instead of the tobacco rc,d. By cutting this upstreamrodl(witha~ zion porous plug wrap) various upstreamipressure drops can be obtained and therefore aiityurent ventilatiionswith thesame tipping/plugwrapg combination. - Investigatee the behaviour of filters ~•;ithi more thar:, one p1ug, wrap (combined filters). P.e f erence s [11 Schneider-W et a1 The Effects o~ the Properties of Materiais in a Cigarette on Filter Vcntilaticn Beitr. Tabakf. Int. Vol 12, 1964, p.123 ['1 j rad_ertscher-T Quartcrly Report, qr288smtba, April-Jun:e 198&, p.83 [',3j l:im-S-H et al Effect of Tipping, Paper Permeability on the \/entilatior, of Filter Cigarettes :;ournal horean, Soc. T'ob. Sci, Vol 6 (1) , 1984, p.79 TEt1 / cog / 016.10.88 cr3'88smtba

i 400-1 350-{ 300-I -250- E ~200 ~ 150-, 100-~, 50-~ tsssuqs;"_,az ~7j m vPo 11S oo > ELECTRQrERF®RAT ED/ MEDIUM -P®ROUS PW --------------------------------------------------------- ~j n x d d c r 0 b ~ z ~ z ~ ~ n x ~ H t~J t'a E' r 11 m - 1-_-T_ _-- ~- ---_ _ 1- F -_-_I _ _ - I ----I -------- r---r -- 20 40 60 80 100 120 140 160 180 200 220 240 QO (ml/min)

PO vs 00 ELECTRO and MICROL./ tIIGtI POROUS PW ----------------------------------------------------- x ~ 2,000-1 z d d ~ c ~ r 0 1 500-J ro ~ , ~ ~ ~ E E 1 ,000~ ~ ~ n H O I t=] JJ CL i r 3M 6M ~ ,q n - C 500 ~ ~ ~ --T-- -----~------- ~- --------i--------- --~ - - --~--~- h7 hU 0 200 400 600 800 1000 1200 1400 ~ Q0 (mi/min) y N s-s!;JV 9V l/!/ iJ