| 发明名称 |
Filter |
| 摘要 |
A filter for a cigarette comprises a porous material sheet wrapped around the filter rod and a cellulose acetate thread formed tram substantially uncrimped cellulose acetate filaments. The cellulose acetate thread is positioned within the filter rod and extends along the central axis of the filter rod. |
| 申请公布号 |
US9078471(B2) |
申请公布日期 |
2015.07.14 |
| 申请号 |
US201313906125 |
申请日期 |
2013.05.30 |
| 申请人 |
British American Tobacco (Investments) Limited |
发明人 |
Sampson John Roger;Lewis David |
| 分类号 |
A24D3/04;A24D3/10;A24D3/02 |
主分类号 |
A24D3/04 |
| 代理机构 |
|
代理人 |
Poulsen N W;Piñol L A |
| 主权项 |
1. A filter for a cigarette or other smoking article comprising:
a porous filter rod having a substantially cylindrical shape, and a cellulose acetate thread formed from cellulose acetate filaments, the cellulose acetate thread extending along the filter substantially parallel to the central cylindrical axis of the filter rod and configured to prevent staining and discoloration of the filter, wherein the porous filter rod has a bulk density in the range 50-150 kg/m3 and the cellulose acetate thread has a bulk density in the range 400-800 kg/m3. |
| 地址 |
London GB |
