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U.S. Patent No. 11,298,274
June 6, 2022
By: Tara Olivo
Associate Editor at Nonwovens Industry
Aya Ide, Ehime, Japan; Yoshitake Ishikawa, Ehime, Japan; and Yosuke Mori, Ehime, Japan. Assigned to Daio Paper Corporation, Ehime, Japan. Filed: 10/16/17 Issued: 4/12/22 An underpants-type disposable diaper comprising: a front side outer member configuring at least a lower torso portion of a front body and a back side outer member configuring at least a lower torso portion of a back body, the front side outer member and the back side outer member being separated from each other and spaced apart in a front-back direction in a middle in the front-back direction; an inner member including a liquid pervious top sheet located on a front surface side, a liquid impervious sheet formed of a resin film located on a back surface side, and an absorbent body interposed therebetween, extending in the front-back direction from the front side outer member to the back side outer member and being joined to each of the front side outer member and the back side outer member, a waist opening and a pair of left and right leg openings being formed by joining both side portions of the front side outer member and both side portions of the back side outer member, respectively; and a display sheet formed of a resin film and being provided between at least one of the front side outer member and the back side outer member and the inner member, wherein a perforated nonwoven fabric provided with a plurality of holes having intervals and penetrating a front and a back is interposed at least from a crotch side edge of the at least one of the front side outer member and the back side outer member overlapping the display sheet, toward a side of the waist opening, to a region between the display sheet and the liquid impervious sheet, and wherein an internal surface and an external surface of the perforated nonwoven fabric are bonded to facing surfaces, respectively, through a hot melt adhesive; and wherein, in a bonding region on at least one of the internal and external surfaces of the perforated nonwoven fabric, the hot melt adhesive is not present inward of a peripheral portion of an area corresponding to each hole, and the hot melt adhesive is present in a continuous plane in and outwards of the peripheral portion of the area corresponding to each hole.
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