Vapour Filtration by Fibrous Cigarette Filters

To investigate the ability of fibrous filters to remove volatile smoke components selectively, filters containing quantities of liquid additives on a fibrous substrate were prepared and tested. Using long filter tips, selective filtration of vapourous materials such as isoprene, acetaldehyde, methanol, acetone, and toluene was achieved. It was found that vapour transport to the filter surface and the sorption of vapours by the liquid coating were of great importance in the process. Diffusion of vapours into the substrate fibers was also found to be important, but was less effective in modifying the filtration properties.