Improved method of making media of controlled porosity and...

Details Improved method of making media of controlled porosity and... Improved method of making media of controlled porosity and...

D - Textiles, Paper

04

H

D04H 3/16 (2006.01) B32B 5/06 (2006.01) B32B 38/04 (2006.01)

Patent

CA 2374810

A method of making a non-woven fibrous media (10) combining high vapor permeability and low liquid permeability, includes the steps of providing a non-woven fabric formed from fibers (10) that are prematurely crystallized during fabric formation and have a wide heat of range distribution, and calendering the fabric to soften the small polymer crystals therein of low heats of fusion, but not the relatively larger polymer crystals therein of relatively higher heats of fusion, thereby to retain high vapor permeability while providing low liquid permeability. The polymer is preferably isotactic polypropylene.

L'invention concerne un procédé de fabrication de milieux fibreux non tissés (10) combinant une grande perméabilité à la vapeur et une faible perméabilité aux liquides. Le procédé consiste à se procurer un non-tissé formé de fibres (10) prématurément cristallisées pendant la formation et présentant une distribution étendue de la plage thermique de fusion. Le procédé consiste ensuite à calandrer le tissu pour y adoucir les petits cristaux de polymère à faibles températures de fusion mais pas les cristaux de polymère relativement plus grands à températures de fusion plus hautes, aux fins d'obtenir une grande perméabilité à la vapeur et une faible perméabilité aux liquides. Le polymère est, de préférence, un polypropylène isotactique.

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