| 摘要 |
<p>A cigarette (10) comprises a tobacco rod (12) and a carbon ion-tow filter(14) comprising a fiber tow (18) with flavored or unflavored carbon particles(20) distributed throughout the tow. The carbon particles have high activityin the range of 90 to 115%, preferably 95%. As mainstream smoke is drawn throughthe filter (14), gas phase smoke constituents are removed and flavor is releasedwhen the particles are flavored. Ventilation (24) is provided to limit the amountof tobacco being combusted during each puff and such ventilation is arrangedat a location near the downstream end of the carbon-on-tow filter to lower mainstreamsmoke velocity through the filter. The filter achieves significant reductionsin gas phase constituents of mainstream smoke, including 90% reductions or greaterin at least one of 1, 3 butadiene, acrolein, isoprene, propionaldehyde, acrylonitrile,benzene, toluene, and 80% reductions or greater in acetaldehyde over extendedshelf life of the cigarettes.</p> |
