A process is provided for the continuous production of nonwoven webs in cylindrical or sheet form from thermoplastic fibers, spinning the fibers continuously from a melt onto a rotating mandrel and winding them up on the mandrel to form a generally spirally wound cylinder. Density of the wound cylinder...http://www.google.es/patents/US4032688?utm_source=gb-gplus-sharePatente US4032688 - Seamless tubular nonwoven webs and filters thereof
Seamless tubular nonwoven webs and filters thereof
