Fluid distribution member for absorbent articles exhibiting...

A - Human Necessities – 61 – F

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A61F 13/15 (2006.01) A61F 13/54 (1995.01)

Patent

CA 2211737

The fluid distribution members according to the present invention preferably comprise three basic components: chemically stiffened, twisted, and curled bulking fibers, high surface area fibers, and thermoplastic binder fibers. Fluid distribution members according to the present invention use a high surface fiber to provide capillary pressure (or suction) to the fluid distribution member. These high surface area fibers are generally small and highly conformable. They provide the substrate with capillary pressure well in excess of the capillary pressure found in the bulk-providing chemically stiffened, twisted, and curled fibers alone. A presently preferred fiber for this high surface application is the eucalyptus family of wood pulp fibers. Eucalyptus provides the capillary pressure usually associated with cellulose fines, but at a large enough length and denier so as to not fill in the voids provided by the chemically stiffened, twisted, and curled fibers and will not easily pass through a forming screen.

Les éléments de répartition de fluides, selon la présente invention, comprennent, de préférence, trois composants de base: des fibres gonflantes, raidies chimiquement, tordues et bouclées, des fibres à surface active importante, ainsi que des fibres liantes thermoplastiques, l'utilisation, dans ces éléments, d'une fibre à surface active importante étant destinée à apporter, à l'élément de répartition de fluides, une pression (ou absorption) capillaire. Ces fibres à surface active importante sont généralement petites et peuvent être mises en forme, et elles fournissent au substrat une pression capillaire nettement supérieure à celle fournie par les seules fibres apportant du volume, raidies chimiquement, tordues et bouclées. Une fibre actuellement préférée pour l'utilisation de sa surface active est une fibre de pulpe de bois appartenant à la famille des eucalyptus. Les fibres d'eucalyptus apportent la pression capillaire généralement associée aux fines de cellulose, mais contrairement à ces dernières, elles présentent une longueur et un denier qui, tout en étant suffisamment importants, ne doivent pas remplir les vides constitués par les fibres raidies chimiquement, tordues et bouclées, et elles ne passent pas aisément à travers un écran en formation.

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