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U.S. Patent No. 9,561,140
March 27, 2017
By: Karen McIntyre
Editor
Satoru Sakaguchi, Kanonji, Japan; and Kana Sawa, Kanonji, Japan. Assigned to Unicharm Corporation, Ehime, Japan. Filed: 2/1/13 Issued: 2/7/17 A disposable diaper, comprising: a longitudinally elongated absorbent main body having a front waistline portion, a back waistline portion, and a crotch portion, and including a liquid-retentive absorber; a side flap provided to a side edge in a widthwise direction of the absorbent main body; and a fastening tape attached to the side flap, extending outwardly in the widthwise direction of the absorbent main body from one of the front waistline portion and the back waistline portion, and configured to be attached to the other one of the front waistline portion and the back waistline portion; wherein the fastening tape has a base sheet, and a hook sheet provided with a plurality of engagement hooks, a fastening tape existent region provided with the fastening tape includes a hook sheet existent region provided with the hook sheet, a KES bending stiffness value of the hook sheet existent region per unit length in a longitudinal direction of the absorbent main body, and a KES bending stiffness value of the hook sheet existent region per unit length in the widthwise direction of the absorbent main body are equal to or less than 1.64 gf•cm2/cm, a height of the engagement hooks is between 60 and 200 μm, and the color difference ΔE between the hook sheet existent region on an inner side of the fastening tape and the side flap adjacent to the fastening tape is 6.5 or more, when the color difference of L*is ΔL*, the color difference of a* is Δa*, and the color difference of b* is Δb* according to the L*a*b* color coordinate system wherein the base sheet has a plurality of hot embossed regions where hot embossing is performed and a non-embossed region where the hot embossing is not performed, light transmittance of the hot embossed regions is different from light transmittance of the non-embossed region, the hot embossed regions are visible from a side of the hook sheet existent region of the fastening tape, and a diameter of an upper end of each of the engagement hooks is smaller than a maximum width of each of the hot embossed regions.
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