A filter element in the form of a nonwoven self-supporting filtration web having rows of folded or corrugated spaced-apart pleats, the web containing continuous thermoplastic fibers a majority of which are aligned at 90°±20° with respect to the row direction. The filter element can be made by forming...http://www.google.fr/patents/US7622063?utm_source=gb-gplus-shareBrevet US7622063 - Pleated aligned web filter
