A method of making a non-woven fibrous media, combining high vapor permeability and low liquid permeability, includes the steps of providing a non-woven fabric formed from fibers that are prematurely crystallized during fabric formation and have a wide heat of fusion range distribution, and calendering...http://www.google.de/patents/US6521555?utm_source=gb-gplus-sharePatent US6521555 - Method of making media of controlled porosity and product thereof
