ENHETLIG POROS STRUKTUR AV POLYTETRAFLUORETEN,FORFARANDE FOR FRAMSTELLNING DERAV SAMT ANVENDNING AV DEN POROSA STRUKTUREN

摘要

A porous polytetrafluoroethylene material is disclosed having a molecular microfibrous structure having, at one surface, a strong orientation in a given direction and, at another opposite surface, a strong orientation and a direction at right angles to the first, in which the orientation of the microfibrous structure progressively changes from one surface to the other. A process for preparing such an element is also disclosed.