Verfahren zur Herstellung einer Faserbahn mit inelastischer Dehnbarkeit

摘要

Component thermoplastic synthetic fiber 35 having inelastic extensibility as well as fiber diameter of 5 - 20 mu m constituting a fibrous web 41 is obtained by melt spinning a mixture of two or more thermoplastic synthetic resins each having a number-average molecular weight in a range of 20000 - 150000 at a draft ratio of 200 - 2300. In the case of the mixture consisting of at least two types of thermoplastic synthetic resin Ra, Rb having number-average molecular weights Ma, Mb, respectively, wherein a ratio Ma/Mb is 1.1 or higher, Ra is of 20 - 80wt%, Rb is of 80 - 20wt% and a sum of Ra and Rb makes up 50 - 100wt% of the mixture.