| 摘要 |
A filter comprises a pad (1) of non-woven fibrous material, the pad having a substantially solid edge (13) of consolidated pad material which has been softened and subsequently hardened. The filter can be manufactured by providing a pad (1) of non-woven fibrous material, treating a peripheral region of the pad so as to form around the pad an edge of consolidated material (13) which has been softened, and subsequently allowing the edge of consolidated material to harden.
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