| 摘要 |
<p>The present invention relates to a novel filter element having a septum with staged pleating in which the heights of successive pleats are related by a specified ratio as well as to a filter assembly incorporating such a filter element. Two particular pleat height ratios are discussed. Pleat sequences according to the pleat height ratios may be repeated about the perimeter of a desired inner core. The septum may also include drainage layers on upstream and downstream of the filter material layer.</p> |
