| 摘要 |
The invention relates to an improved multiple cavity (4) filter (2) comprising at least a first filter length (3) and a second filter lengths (3), at least a cavity (4) between said first and second filter lengths (3), a first paper (6), partially externally enclosing said first and second filter lengths (3), as well as said cavity (4), leaving an upper filling opening, filling material (5) to be introduced within said cavity (4) through said opening created by said first paper (6), and a second paper (7), outer with respect to said first paper (6), completely wrapping said first inner paper (6) and said first and second filter lenghts (3), and said cavity (4).
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