| 摘要 |
A tobacco smoke filter includes a smoke pervious rod of plastic material about which a smoke impervious plastic overwrap film is extruded. In the preferred embodiment, the overwrap and the rod are made of the same material, e.g., cellulose acetate. By using the same material, waste from the normal filter-making processes can be formed into granules or pellets and rendered molten for re-cycling as the raw material for the overwrap film. The resulting filter can be used with or without a tipping paper cover and can be perforated or not, as desired, to ventilate the filter rod.
|
