NONWOVEN FABRIC COMPOSED OF ULTRAFINE FIBER AND METHOD FOR PRODUCING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a nonwoven fabric composed of an ultrafine fiber and having high rate of change of fiber diameter and to provide a nonwoven fabric with low basis weight having low pressure loss and excellent in particulate collecting performance, particularly a nonwoven fabric which is suitably useable for air filters. SOLUTION: The nonwoven fabric is composed of a thermoplastic polymer and has 50-800 nm average fiber diameter and≥55% rate of change of fiber diameter. COPYRIGHT: (C)2007,JPO&INPIT