| 摘要 |
A filter for a cigarette includes a porous filter rod having a capillary smoke passageway extending coaxially therethrough. The filter rod is circumscribed by a non-porous wrapper and the filter rod with the non-porous wrapper therearound is provided with at least one groove extending from one end thereof a preselected distance longitudinally therealong. The groove preferably extends from the mouth end of the filter rod. Tipping material circumscribes the non-porous wrapper and is provided with flow-through openings therein in flow communication with the groove. In one embodiment, the filter rod includes a cylindrical collar coaxially located at the mouth end defining a recess, the thickness of the wall of the collar being less than the depth of the groove. In a further embodiment, the filter collar includes a concentric open core member coaxial with and open to the capillary flow passageway with the area between the core member and collar wall being open to the groove. In a still further embodiment, the filter rod includes a cylindrical filter collar located at the mouth end defining a recess, the filter collar covering the open end of the groove at the mouth end of the filter rod. |
