Hiroki Goda, Kanonji, Japan; Satoshi Mizutani, Kanonji, Japan; and Kou Detani, Kanonji, Japan. Assigned to Unicharm Corporation, Ehime, Japan.
Filed: 3/31/11
Issued: 3/3/15
A bodily fluid-absorbent structure, comprising liquid-absorbent material formed of an aggregation of fluff wood pulp fibers and having an inner surface and an outer surface, a liquid-pervious sheet covering said inner surface, and a liquid-pervious or liquid-impervious sheet covering said outer surface, wherein said aggregation has a basis mass in a range of 150 to 500g/m2 and a specific volume in a range of 3 to 20 cc/g; a relationship between a horizontal orientation index IH and said specific volume VSP of said fluff wood pulp fibers in said aggregation is represented by the following formula IH is less than or equal to −0.099VSP+2.4 and said horizontal orientation index IH is a value obtained according to the following formula IH=CS1/((CS2+CS3)/2) where CS1 represents an average cross-sectional area of said fluff wood pulp fibers observed on a cross-section extending in parallel to a horizontal plane when said outer surface of said aggregation is placed on said horizontal plane, CS2 and CS3 represent average cross-sectional areas of said fluff wood pulp fibers observed on two cross-sections extending orthogonally to each other and to said horizontal plane.