| 摘要 |
A smoking article mouthpiece element comprises a first portion within which a smoke-passage and a ventilation-duct extends from end-to-end of the portion, a downstream end of the duct being spaced from the periphery of the first portion and the wall and the walls of the duct being gas impervious and a second portion disposed at the end of the first portion being in smoke-flow communication with the smoke passage of the first portion, and gas-impervious wall at the end of said second portion closer to the first portion extending inwardly from a first location at the periphery of the element to a second location at the side of the upstream end of the duct further from the first location, the wall bounding a cavity in communication with the duct and segregated from the interior of the second portion. The first and second portions may form respective parts of an integral unit or may be discrete components disposed in end-to-end abutment. The aforesaid wall is suitably part of the second portion. Smoke filtration material may be disposed in the smoke passage and/or in the interior of the second portion. The ventilation-duct, which advantageously extends substantially parallel to the longitudinal axis of the first portion, may be one of a plurality of similar duct or ducts. A smoking article according to the invention may thus comprise a smoking-material rod, a mouthpiece element with a cavity as aforesaid and a wrapper extending about said mouthpiece element and providing for ingress of air to said cavity. The ratio of the velocity of air issuing from the mouth end of said ventilation-duct means to the velocity of smoke issuing from the mouth end of said smoke-passage means being in excess of at least ten, and possibly in excess of twenty when said smoking article is smoked under standard machine-smoking conditions. In detail, a smoking article mouthpiece element may be substantially as hereinbefore described with reference to FIGS. 1, 2 and 3 or FIGS. 4 and 5 or FIGS. 6 and 7 of the drawing. |
