Patent ID: 7255763

Claim:
A process for making a fibrous web having inelastic extensibility generally comprising the steps of: providing a thermoplastic synthetic resin; melt spinning continuous inelastically extensible fibers from the thermoplastic synthetic resin through a plurality of nozzles; and accumulating the inelastically extensible continuous fibers on continuously running belt, said thermoplastic synthetic resin comprising a mixture of at least two different types of thermoplastic synthetic resins each having number-average molecular weight of 20000-150000, said mixture including: a first thermoplastic synthetic resin which comprises 20-90 wt. % of the inelastically extensible fibers and has a number-avenge molecular weight M 1 ; and a second thermoplastic synthetic resin which comprises 80-10 wt. % of the inelastically extensible fibers and has a number-average molecular weight M 2 , said mixture being prepared so that a sum of said first thermoplastic synthetic resin and said second thermoplastic synthetic resin makes up 50-100 wt % of said mixture and a number-average molecular weight ratio of said first thermoplastic synthetic resin to said second thermoplastic synthetic resin is 1.1 or higher, said melt spinning comprising using a draft ratio of 200-2300 so that said continuous inelastically extensible fibers each have a fiber diameter of 5-20 μm.