| 摘要 |
A filter for a smoking article such as a cigarette, comprising several grooves (2) of varying depth between a shallow inlet end (3) and a deep outlet end (4) thereof, the outlet end face (8) being air permeable to an extent greater than are the floor (7) or the sides of each groove (2). A tipping (5) enwrapping the filter plug (1) has ventilation perforations (6) in the region of the inlet end of each groove. Alternatively, the grooves may have their median axes in a plane which is perpendicular to the axis of the filter plug, whereby the grooves extend circumferentially of the filter plug between the shallow inlet ends and the deep outlet ends. <IMAGE> |
