| 摘要 |
<p>Improvements to filters of the type which are in the form of cartridges and comprise a perforated central tubular member (1) integrally attached to two flanges (2 and 3) and surrounded by a filtering body made of porous paper, characterised in that the filtering body made of porous paper comprises a first filter paper (6) folded accordionwise and arranged so that the edges of the folds extend parallel to the central tubular member and a second filter paper (7) folded accordionwise and chevroned. <IMAGE></p> |
