Patent ID: 6312545
Filing Date: 2001-11-06
Classification: D01F,D04H,Y10T

Abstract:
A process for the manufacture of a spunbonded fabric from thermobonded curled bicomponent fibers consisting of two plastic materials having different properties, said process comprising the following steps:(a) drawing off the bicomponent fibers melt spun from the two plastic materials uncurled and stretching the bicomponent fibers,(b) placing the bicomponent fibers on a sieve belt and thermobonding the bicomponent fibers to obtain a nonwoven fabric,(c) stretching the bicomponent fibers of the nonwoven fabric lengthwise and/or transversely and heating the bicomponent fibers during the stretching, and thereafter(d) relaxing the bicomponent fibers of the nonwoven fabric to obtain the spunbonded fabric with curled bicomponent fibers,wherein the bicomponent fibers in step (a) are spun from two polypropylene granulates with a first polypropylene granulate having an MFI viscosity range of 16 to 35 and a second polypropylene granulate having an MFI viscosity range which is 8 to 10 points below the MFI viscosity range of the first polypropylene granluate.