Method for forming an apertured web

A - Human Necessities – 61 – F

Patent

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A61F 13/15 (2006.01) B26F 1/24 (2006.01) B26F 3/00 (2006.01)

Patent

CA 2346818

A method for forming an apertured web which may be used as a topsheet on a disposable absorbent article, such as a diaper. The web (240) is fed in as machine direction through a first nip (250) formed by a pair of rollers one of the rollers having a smooth outer surface and the other roller having an outer surface with a plurality of projections extending from it's outer surface. At least one of the rollers of the first nip (250) is heated. The first nip (250) apertures the web with a plurality of apertures each having a fused perimeter. The web (240) is then cooled to solidify the fused perimeter of the apertures. The web (240) is then fed through a second nip (280) formed by a pair of rollers to break the solidified fused perimeter of the apertures. One of the rollers of the second nip (280) has an outer surface with a plurality of grooves.

La présente invention concerne un procédé permettant de fabriquer un voile perforé (240) qui peut être utilisé comme enveloppe extérieure pour un article absorbant jetable tel que des couches. Le voile est introduit dans la zone de pincement (250) de deux cylindres dont l'un présente une surface extérieure lisse et l'autre une surface extérieure munie d'une pluralité de saillants. Au moins un des cylindres de la première zone de pincement (250) est chauffé. La première zone de pincement (250) sert à pratiquer plusieurs perforations dont chacune possède un périmètre obtenu par fusion. Le refroidissement ultérieur du voile multicouche (240) entraîne une solidification du périmètre obtenu par fusion des perforations. Le passage dans une deuxième zone de pincement (280) d'une deuxième paire de cylindres provoque la rupture du périmètre solidifié obtenu par fusion. L'un des cylindres de la deuxième zone de pincement (280) possède une surface externe munie de plusieurs cannelures.

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