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U.S. Patent No. 9,629,758
July 31, 2017
By: Tara Olivo
Associate Editor at Nonwovens Industry
Satoru Sakaguchi, Kanonji, Japan. Assigned to Unicharm Corporation, Ehime, Japan. Filed: 3/28/17 Issued: 4/25/17 A disposable diaper, comprising: a front waistline region; a rear waistline region; a crotch region positioned between the front waistline region and the rear waistline region; a product longitudinal direction from the front waistline region towards the rear waistline region; a product widthwise direction perpendicular to the product longitudinal direction; and an absorber running across the crotch region and extending to the front waistline region and rear waistline region; and a waistline retaining unit that retains the disposable diaper around a body of a wearer, in the front waistline region and the rear waistline region; wherein the absorber is provided with a narrow region that a length in the widthwise direction of the absorber becomes smaller towards an inner side in the product longitudinal direction; a length of the absorber in the crotch region in the product widthwise direction is smaller than a length of the absorber in the front waistline region and a length of the absorber the rear waistline region in the product widthwise direction; the absorber includes: a first region arranged at least partially in the crotch region; a second region arranged adjacent to the first region at an outer side from the first region in the product longitudinal direction and having a lower bending rigidity than that of the first region; and a third region arranged adjacent to the second region at an outer side from the second region in the product longitudinal direction and having a higher bending rigidity than that of the second region; a boundary between the first region and the second region is arranged at the side of the front waistline region from a center of the disposable diaper in the product longitudinal direction and is arranged in the narrow region; a boundary between the second region and the third region is arranged at the side of the crotch region from an end at the crotch region side of the waistline retaining unit in the front waistline region; and an end at the front waistline region side of the third region is arranged at the side of the front waistline region from the end at the crotch region side of the waistline retaining unit in the front waistline region.
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