| 摘要 |
<p>An efficient filter for cigars and cigarettes results from a special smoke flow path and precooling structure. The flowpath extends through a cigar or cigarette holder. It proceeds through two restrictions in series. The smoke is made to change flow direction after the first restriction and is allowed to expand in limited degree. It is allowed to expand in greater degree and is made to flow with turbulence over a tar collection surface after passing the second restriction. The effect of that arrangement is to condense a large proportion of the tars and nicotine out of the smoke in a way that avoids significant altering of the flow path shape. The smoke is precooled by the introduction of ambient air which is mixed with the smoke upstream from the restrictions. The filtering efficiency is not much affected by the ratio of air to smoke so that the holder is useful in aiding smokers to withdraw from the smoking habit by the method of successively increasing the proportion ratio of air to smoke.</p> |
