Smoking Puff Ratio of Cigarette and Its Determination Method

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1 Smoking Puff Ratio of Cigarette and Its Determination Method Zhiguo Wang Technology Center of China Tobacco Hunan Industrial Co. Ltd Changsha, Hunan, P.R.China,

2 The Definition of Smoking Puff Ratio(SPR) Butt SPR= Tobacco burned during smoking Tobacco burned during smoldering +

3 Cigarette smoking on different puff intervals T J : smoldering time T J Butt P i = p i - 1 (i=1,2,,i), p i is the puff on the ith puff interval t i Butt T i =T J - t i +2 P i (i=1,2,,i) t i is the smoking time on the ith puff interval P i = p i - 1 In fact, P i is the puff increase on different puff intervals comparing cigarette smoldering, while T i represents the smoking time reduction on different puff intervals comparing cigarette smoldering.

4 350 Smoking Ratio Experiment (Marlboro) T i P i T=16.17 P+2.175, R 2 =

5 T = k P+b The calculation of SPR SPR i =(k p i +b)/(t J -2+k) T J : smoldering time p i : the puff on the ith puff interval (k p i +b) is the equivalent smoldering time corresponding to p i, (T J -2+k) is the total smoldering time of a cigarette (including the igniting puff )

6 The influence of venting to SPRs Smoking Ratio Experiment (Marlboro) Smoking Ratio Experiment (Marlboro with Vents Blocked) T i 200 T i P i P i SPR 60 =22.24% SPR 60 =32.57% Venting the tipping paper results in a significant decrease of SPR

7 The influence of tobacco and accessory materials to SPRs Accessory materials for Baisha (Boutique), SPRs= 25.6% 0.7% SPR R 2 Nise Baisha (hard) Baisha (Harmony) Baisha (Boutique) Cut stem Accessory materials for Baisha (Hard), SPRs= 27.8% 1.1% SPR R 2 Nise Baisha (hard) Baisha (Harmony) Baisha (Boutique) Cut stem SPR values of different cigarettes with the same accessory materials vary in a relatively small range, while there exist obvious distinction of SPR values between different accessory materials. The accordance of SPR values over the same accessory materials supplies us with the possibility that the smoke component yield of blended tobacco might be calculated by that of single-grade tobaccos according to their proportion.

8 The correlations of SPR with puff interval Smoking Ratios vs Puff Intervals R Puff Intervals The correlations of SPR with puff interval Lengthening the puff interval leads to a rapid decrease of SPR.

9 The correlations of SPR with TPM and CO TPM and CO vs Smoking Ratios TPM and CO Smoking Ratios The correlations of SPR with TPM (blue) and CO (red) hortening the puff interval results in an increase of total particulate atter (TPM) and carbon monoxide (CO). The increasing rate of TPM long with the increase of SPR value is significantly higher than that f CO.

10 The correlations of SPR with TPM and CO The fitting function is y=ax 2 +bx+c Marlboro (White) Baisha (Boutique II) Baisha (Soft) Baisha (Gold nobility) TPM vs SPR CO vs SPR TPM vs SPR CO vs SPR TPM vs SPR CO vs SPR TPM vs SPR CO vs SPR a b c R The coefficients of quadratic term (a) of TPM to SPR are all positive, while the coefficients of quadratic term (a) of CO to SPR are all negative

11 O yields of One puff on different puff intervals Puff interval (s) Marlboro (White) Baisha (Boutique II) Baisha (Soft) The CO yield of one puff reaches its highest value when the puff interval is set to 60s, which is utilized by ISO smoking pattern Baisha (Gold nobility)

12 Conclusion In this paper, we introduced the concept of smoking puff ratio of a cigarette and proposed a method to determine it. The proposed method is simple and operationally convenient. It requires no additional instrument but smoking machine, and no extra measurement but cigarette smoking. The experimental results showed that SPR values of different cigarettes with the same accessory materials vary in a relatively small range. And accessory materials are the more important factors affecting SPR than cut tobacco. The increase of SPR can lead to the corresponding increase in TPM and CO. While the TPM shows a significantly higher increase rate than CO. The introduction of SPR can help evaluate the actual intake of smoke components on different smoking habits and the actual transfer rate of chemical compounds from cut tobacco into mainstream smoke.

CORESTA RECOMMENDED METHOD N 25

CORESTA RECOMMENDED METHOD N 25 AMBIENT AIR FLOW AROUND CIGARETTES IN ROUTINE ANALYTICAL SMOKING MACHINES : CONTROL AND MONITORING (August 1991) 0. INTRODUCTION The development of smoking machines has