| 摘要 |
The present invention relates to a cigarette filter which allows a more efficient retention of harmful substances. The filter consists of a filtration zone (1) with a case containing particulate activated carbon for the initial filtration, whereas subsequently two spiral channels and two respective chambers contribute to the retention of as many substances as possible. The outer spiral ring (4) as well as the inner spiral channel (8) have a continuously reducing step, so that a endless-screw configuration is created, while at the same time their inner surfaces consist of a sticky material for retaining smoke particles. Finally, before discharge, the smoke is passed through a filtration element (12). The filter may be employed independently in cartridges for use in pipes or hand-rolled cigarettes.
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