A method for making spunbond nonwoven fabric from multiple...

D - Textiles – Paper – 04 – H

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D04H 3/00 (2006.01) D01D 5/30 (2006.01) D01D 5/32 (2006.01) D01D 5/34 (2006.01) D01F 8/06 (2006.01) D01F 8/14 (2006.01) D04H 3/16 (2006.01)

Patent

CA 2458719

A method for preparing multiple component spunbond nonwoven fabrics in which the individual polymer components are extruded from separate orifices and contacted and fused after extrusion to form multiple component filaments that are drawn, quenched, and collected to form a spunbond web. The method is especially suitable for forming multiple component spunbond webs in which the different polymeric components have significantly different viscosities, for example in forming nonwoven webs comprising multiple component filaments having three-dimensional helical crimp.

L'invention concerne un procédé permettant de préparer des tissus non-tissés filés-liés à composants multiples. Ce procédé consiste à extruder les composants polymères individuels à travers des orifices distincts puis à les faire entrer en contact et à les fusionner les uns aux autres après l'extrusion afin de former des filaments à composants multiples, qui sont étirés, trempés et collectés pour former un voile filé-lié. Ce procédé convient en particulier pour produire des voiles filés-liés à composants multiples dans lesquels les différents composants polymères présentent des viscosités sensiblement différentes, par exemple pour produire des voiles de non-tissé comprenant des filaments à composants multiples qui présentent une frisure hélicoïdale tridimensionnelle.

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