| 摘要 |
<p>@ A variable air dilution cigarette filter is disclosed. A thin, generally rigid cylindrical sleeve (20) having internal retention steps or barbs (26) is provided with one or more air passing slots (28) or perforations. A filter rod (32) having a filter wrap (40) is inserted within the cylindrical tube or sleeve and is held within the tube by the retention steps. Relative rotation between the sleeve and the filter rod varies the amount of smoke diluting air which is allowed to pass through the slots in the sleeve and thence through the filter rod. A tobacco rod (44) is joined to the sleeve by tipping paper (46) or the like to thereby produce a cigarette incorporating the variable air dilution cigarette filter assembly.</p> |
