Absorbent core having improved fluid handling properties

A - Human Necessities – 61 – F

Patent

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A61F 13/15 (2006.01)

Patent

CA 2165292

An absorbent core comprises in sequence through its thickness, a first structure comprising an upper layer comprising a first fibrous material (3) having a wet compressibility of at least 5 cm3 g-1 and a drip capacity of at least 10 g g-1, the structure also comprising a first superabsorbent material (5) having a substantially non- decreasing dynamic swelling rate and a second structure comprising a second fibrous material (6) and a second superabsorbent material (7) having a dynamic swelling rate of at least 0.2g g-1 s-1 and an absorption against pressure of at least 15 g g-1 at 50 g cm-2 (0.7 psi), wherein the dynamic swelling rate of the first superabsorbent material is not greater than 2/3 of the dynamic swelling rate of the second superabsorbent material. The absorbent core allows improved fluid handling of body discharges throughout the core and in the subsequent efficient storage of these discharges.

La couche centrale absorbante comporte, en séquence dans son épaisseur, une première structure ayant une couche supérieure comprenant un premier matériau fibreux (3) avec un compressibilité à l'état humide d'au moins 5 cm3 g-1 et une capacité d'égouttage d'au moins 10 g g-1, cette structure comprenant également un premier matériau superabsorbant (5) avec une vitesse de gonflement dynamique qui ne décroît pas sensiblement. Vient ensuite une seconde structure comprenant un second matériau fibreux (6) et un second matériau superabsorbant (7) ayant une vitesse de gonflement dynamique d'au moins 0,2 g g-1 s-1 et une absorption contre la pression d'au moins 15 g g-1 à 50 g cm-2 (0,7 psi). La vitesse de gonflement dynamique du premier matériau superabsorbant ne dépasse pas les 2/3 de la vitesse de gonflement dynamique du second matériau superabsorbant. La couche centrale absorbante permet une absorption améliorée et bien répartie des fluides corporels. Ces fluides sont ensuite retenus d'une manière efficace.

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