Cigarette combustion parameters and their effects on the deliveries of selected mainstream smoke constituents
In order to investigate potential dependencies between cigarette combustion parameters, such as temperature, pressure drop, etc, and the deliveries of selected constituents in mainstream smoke in real time, a set of on-line analytical systems were developed. The systems can simultaneously determine the gas flow distribution, pressure drop and combustion temperature in a cigarette during smoking. Cigarette samples having different air permeability were used to conduct the studies with the real time on-line analytical systems. The correlations between the gas flow distribution, pressure drop and combustion temperature were studied. Furthermore, the effects of the combustion parameters on the puff-by-puff deliveries of selected constituents, such as tar, nicotine, water and TPM in mainstream smoke were examined.
The results showed that: (1) There were very significant correlations among the gas flow through the burning cone, the gas flow through the tipping paper, the pressure drop and the combustion intensity; (2) Combustion parameters, especially the gas flow through the burning cone, were very significantly correlated to the deliveries of selected constituents in mainstream smoke; (3) The combustion intensity, that is defined as the product of the average combustion temperature and the number of corresponding data points, were very significantly correlated to the gas flow through the burning cone, the deliveries of selected constituents in mainstream smoke and the pressure drop below 800 °C. This correlation became less pronounced when the temperature in the burning cone was above 800 °C; (4) Significant correlations between the ventilation rate of filter and combustion parameters were found.