| 摘要 |
<p>A filter tip for cigarette comprises a filter element (1), a surround (2) and a connecting piece (3). There is provided at least one spiral passage in the filter element (1). The spiral passage is a hole with a spiral groove provided on the hole wall. The spiral passage extends along the axis of the filter element (1) and has at least one spiral hole. The spiral passage runs through the filter element or not. There are many passages in the filter element (1).</p> |
