Porous fluoropolymer films, such as PTFE films, formed by a method including the steps of (a) forming a fluoropolymer (e.g., PTFE) paste, (b) extruding, calendaring, or otherwise processing the paste to form a film extrudate, (c) causing the film extrudate to be calendared in a first directional axis,...http://www.google.fr/patents/US6099791?utm_source=gb-gplus-shareBrevet US6099791 - Methods of manufacture of multiaxially oriented fluoropolymer films
Methods of manufacture of multiaxially oriented fluoropolymer films
