Re!erence No.
31.3
Research C-znference, Canada - August, 1522
SIMULATION OF nIfE EFFECT OF HU24AN SMOKER B_'OCY:N':;
THE 712 VENTILATION ON CAMBRIDGE
T. Hirji
A small experiment was carried out to investigate the effezt cf blocking
the t-o ventilation on:
(a) TPH delivery;
(b) --nbound cigarette pressure drop; and
(c) tip ventilation.
The cicarettes used were the Img soft-cup version of Zambridge as
suppl_`ad by B&W last September.
Initially it was planned to determine deliveries in five states of tip
ventilation blockage and at two puff volumes 35cc and 50cc ;er 2-second
puff at 1 puff per minute). However, after the first set of smoking
runs it was discovered that the puffing frequency used was 2 cuffs per
minute instead of the recurred 1 puff per minute. There!ore the smoking
runs were repeated. As it happens, the frequency of 2 puffs per minute
is probably closer to the human situation (althouth the pu` volume of
50cc -is probably on the--%Q:4. side) and therefore these -esu ts have also
been included in Table 1. C@I t,
The butt mark used during smoking was as per FTC method o! @vertipping
(32r.7%) plus 3mm. The ci@:arettes were smoked on the 20 rozt Borawaldt
smoking machine (Pluto 1:7.) and the mean deliveries are based on 10
cigarettes. The ventilation and pressure drops are -tans of 20
cigarettes. The following ventilation blockages were achLeved by using
sel!-adhesive labels:
As is Each patch Each patch Each patch All over
2mm 4mm 6mm
The !cur-rc-d perforation zone on Cambridge is 4mm wide an! each patch
was 0=:m in width. The deliveries obtained are shown in Ta'---e 1 and
Fig-.:rc 1.
cc
BATCo document for Province of British Columbia 19 April 1999

2
TABLE
BLOCKING EFFECT
(TPM deliveries in mg/ciq)
PATCH SIZE
None 2 x 6mm 4 x 6mm 6 x 6r.-m 'A-"- over
Unbound cig PA. WG) 105 114 117 12B :16
Tip ventilation W, 78.4 76.8 70.4 64.5 1.8
1 puff/min
35cc/2 sec T.P.4 1.29 1. 61 1.69 2.30 8.44
Puff No. 8.0 7.5 6.9 7.2(?) 5.S
TPIA 1 2.63 2.83 3.6
socc/2 SeC 9 4 35 12.58
Puff No. 7.2 7.2 7.i 7:0 5.0
2 ouf
35cc/2 sec TPM 2.29 3.00 3.48 4.61 '3.24
Puff No. 14.5 14.5 14.2 13.2 9.3
Socc/2 sac TPM 4.52 5.63 6.51 7.83 2C.9
Puff No. 13.1 12.5 12.3 11.5 7.7
, sec/ouff every
25 sec, 23.07 33.3G
TP114 15.21
PM%%1NF 12.03 16.27 -.7.35
Nicotine 0.92 1.32 1 42
Puff No. 13.0 10.4 1 8:4
Work carried out in October 1981
rn addit4on to the objective work using patches, 3 batches of c--aar-
;ttes each were smoked on a single port Borqwaldt smoking machine by 2
operators. In these instances, the operators actually blockei the
ventilation zones with their fingers during smoking and to be rea:istic
the SM01.4ng on each cicarettes was stopped at the end of the -@uff
c'osest to the butt mark. The mean deliveries obtained are s@c,-;n Jn
elk, Table 2.
0 19S: 3-ttish American an T,4mccu Cc LkL I his must not be be cupecd or or Jo.m k, am-ruehansed person,
BATCo document for Province of British Columbia i9 April '1999

FIG I
TPM VERSUS TIP VENTILATION
EFFECT OF BLOCKING
TPM
C mg/ cig)
34
32
30
2 8
26 -
24
22
20 50/2/2
i 6 0 (2)
1 4
i 2
10
6 35/2
4 -
2
70 1 120
0 10, 20 30 4. 50 6b
TIP VENTILATION
4MM JAS is
ALL OVER PATCH
6mm rr. m
PATCH PATCH
(1 I 35/2/1 - 35 c-. PJF"'. 2 SECOND DURATION, I PUFF PER MIN UTE.
(2) 0 - 75 cc PUFF, I SECOND DURATION. PUFF' EVERY 25 SEC.
CC
@x
BATCo document for Province of British Columbia 19 April 1999

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TABLE 2
HMAN BLOCKING
(Sirg-le Port Aachine, 35 cc/1 SeC/1 puff/min)
10perator A TPM 3.1
Puff No. 7.6
Operator A TPM 2.5
Puff No. N/A
Operator B TPM 4.0
Puff No. 7.4
Hearing in mind that the latter smoking runs were carried out on a
different smoking rachine and that the final deliveries wi@l be verv
sensitive to the cntssure applied by the fingers during seeking, th@
delivery range of 42.i-4.0 mg TPH suggests that the effect of covering
ventilation holes !:-.- s-...o-:ers is at least equivalent to backing the
ventilation wit6 two 6 r.---.i x 6 mm patches. Since the circumference of
Cambridge is 25 this is equivalent to blocking 50% of tl-e circum,-
ference.
Figure 2(a) shows the staining patterns in the mouth end of the filter
during the smoking run b-y Operator B (TPM - 4 mg/cig). 7hese may be
compared with tube staining pattern obtained on the same machine using
cigarettes with too 6 mm x 6 mm patches shown in Figure 2(b). It should
be pointed out t@at during human smoking it is unlikely that the smokers
will block exactIly the same portion of the tipping during each puff and
hence the staining =atterns shown in Figure 2 may not be achieved.
2 Staining pattern of the filters
(a) Ifuran (b) 71,10 6 mm x
6 rz. patch
C1-
ck@
0 i9s: n,,:,shA.-rCnZ3n C-@. Led. This n'U%t not be copied ol sho-n ir uniuihorised,-:-,z,:t%.
BATCo document for Province of British Columbia 19 April 1999