Coextruded three-dimensional fluid-pervious plastic web

A - Human Necessities – 61 – F

Patent

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Details

A61F 13/15 (2006.01) A61F 13/46 (1995.01)

Patent

CA 2159585

The present invention provides an absorbent article including a fluid pervious topsheet, a fluid impervious backsheet joined to the topsheet, and an intermediate layer positioned between the topsheet and the backsheet. The topsheet comprises a resilient, three-dimensional macroscopically expanded, fluid pervious web (10) including a first polymeric material (50) which exhibits a first melting point temperature and a second polymeric material (52) bonded to the first polymeric material to form a laminate. The second polymeric material exhibits a second melting point temperature which is less that the first melting point temperature. The web has first and second surfaces (41, 43) spaced apart by a distance greater than the thickness of the laminate. The web includes a plurality of capillaries (40) extending from the first surface to the second surface. The capillaries are defined by a plurality of sidewall portions (55) interconnected to one another intermediate the first and the second surfaces and terminating in the second surface, such that when the web is heated to a temperature between the first melting point temperature and the second melting point temperature the second polymeric material of the sidewall thermally bonds to the intermediate layer (61, 201, 305) along the second surface of the web.

Article absorbant comportant une feuille supérieure perméable, une feuille de fond imperméable liée à la feuille supérieure et une feuille intermédiaire placée entre la feuille supérieure et la feuille de fond. La feuille supérieure comprend un voile tridimentionnel, souple et perméable à expansion macroscopique (10) fait d'un premier polymère (50) à point de fusion donné et d'un second polymère (52) lié au premier polymère pour former un stratifié, et ayant un point de fusion inférieur à celui du premier polymère. Le voile présente deux surfaces (41, 43) séparées par une distance supérieure à l'épaisseur du stratifié. Le voile comporte une multiplicité de fibres capillaires (40) s'étendant entre les deux surfaces. Les fibres capillaires se caractérisent par une multiplicité de parois (55) latérales interconnectées entre elles entre les deux surfaces et aboutissant à la deuxième surface de telle façon que lorsqu'on chauffe le voile à une température comprise entre le premier et le second point de fusion, le second polymère de la paroi latérale adhère thermiquement à la couche intermédiaire (61, 201, 305) le long de la seconde surface du voile.

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