Physical parameters of the ventilated filter cigarette

Abstract

The main physical parameter of all ventilated filter cigarettes is the filter ventilation. It has been known for many years that these cigarettes have a possibility to achieve major reductions in all noxious smoke components including those in the gas phase, and that filter ventilation is a practical tool for controlling smoke deliveries. The term filter ventilation in this case describes the supply of diluting air to the main-stream smoke via the ventilated cigarette filter. Smoking of a lit cigarette is a nonlinear dynamic process, and filter ventilation depends on the interrelationship between a number of factors. Fortunately, the total ventilation measured on an unlit cigarette during constant and standard air flow at mouth end is somewhat lower than for a lit cigarette. It was shown that linear models used here make it possible to estimate filter ventilation degree for various commercial unlit cigarettes from nondestructive pressure measurements and geometrical data