发明公开
EP0392112A1 Cigarette and filter therefor 无效
Zigarette und Filterdafür。

Cigarette and filter therefor
摘要:
A cigarette filter 12 comprises a rod of filter material having an inner zone 16 or 60% to 90% filter efficiency and an outer zone 18 of 10% to 40% filter efficiency, the inner zone occupying from 30% to 60% of the cross-sectional area of the filter. The filter is attached to a tobacco rod 10 by a tipping 14 having perforations 24 admitting air into the filter.
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