US 12,274,608 B2
Disposable diaper with improved absorption and leakage protection
Yuki Okada, Ehime (JP)
Assigned to DAIO PAPER CORPORATION, Ehime (JP)
Appl. No. 17/771,620
Filed by DAIO PAPER CORPORATION, Ehime (JP)
PCT Filed Nov. 18, 2020, PCT No. PCT/JP2020/043056
§ 371(c)(1), (2) Date Apr. 25, 2022,
PCT Pub. No. WO2021/100777, PCT Pub. Date May 27, 2021.
Claims priority of application No. 2019-209788 (JP), filed on Nov. 20, 2019.
Prior Publication US 2022/0409448 A1, Dec. 29, 2022
Int. Cl. A61F 13/512 (2006.01); A61F 13/49 (2006.01); A61F 13/511 (2006.01)
CPC A61F 13/5126 (2013.01) [A61F 13/49 (2013.01); A61F 2013/51117 (2013.01); A61F 2013/5127 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A disposable diaper comprising a top sheet constituting a surface for use, a liquid-impervious sheet provided on an under face side, and an absorbent element interposed therebetween,
wherein an intermediate sheet, which has a faster body fluid permeation rate compared to the top sheet, is interposed between the top sheet and the absorbent element,
wherein the top sheet is formed of a first air through nonwoven fabric having a basis weight of 10 to 30 g/m2, and wherein the first air through nonwoven fabric is perforated having a number of holes arranged at intervals and each penetrating two sides of the fabric,
wherein the intermediate sheet is formed of a second air through nonwoven fabric having a basis weight of 20 to 80 g/m2, and a fineness of raw material fibers of the second air through nonwoven fabric is 2.0 to 10 dtex,
wherein imaginary linking lines connecting groups of the holes form a Moroccan pattern with a rhombic lattice which is slanted with respect to a front-back direction and a width direction all over the top sheet,
wherein an area of one non-perforated region encircled by an imaginary line connecting the holes in the Moroccan pattern with a rhombic lattice is 1.0 to 3.5 cm2,
wherein each of the holes is in a circular shape with a diameter of 0.5 to 1.5 mm or a shape in 0.5 to 1.5 mm size in terms of equivalent diameter, and a center-to-center distance between adjacent holes in the front-back direction and the width direction is 1.0 to 4.0 mm, and
wherein a hydrophilic moisturizer containing 80 mass % or more glycerin is applied to the top sheet.