US 12,329,622 B2
Nonwoven fabric and method for producing same
Hirokazu Terada, Shiga (JP)
Assigned to JNC CORPORATION, Tokyo (JP); and JNC FIBERS CORPORATION, Tokyo (JP)
Appl. No. 18/278,002
Filed by JNC CORPORATION, Tokyo (JP); and JNC FIBERS CORPORATION, Tokyo (JP)
PCT Filed Mar. 1, 2022, PCT No. PCT/JP2022/008545
§ 371(c)(1), (2) Date Aug. 20, 2023,
PCT Pub. No. WO2022/202142, PCT Pub. Date Sep. 29, 2022.
Claims priority of application No. 2021-048081 (JP), filed on Mar. 23, 2021.
Prior Publication US 2024/0139040 A1, May 2, 2024
Int. Cl. A61F 13/511 (2006.01); A61F 13/15 (2006.01); A61F 13/51 (2006.01); D04H 1/541 (2012.01)
CPC A61F 13/51121 (2013.01) [D04H 1/541 (2013.01); D10B 2401/022 (2013.01); D10B 2401/063 (2013.01); D10B 2403/022 (2013.01); D10B 2509/026 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A nonwoven fabric in which points at which heat fusible composite fibers intersect with each other are fused by heat, the nonwoven fabric comprising:
a high-density-side surface layer having a fiber density of 5 to 20 fibers/mm2,
wherein a ratio of the fiber density of the high-density-side surface layer and a fiber density of a low-density-side surface layer of the nonwoven fabric is 1.4 or less, and
a strength per unit basis weight of the nonwoven fabric is 0.40 N/50 mm or greater, wherein a specific volume is 100 cm3/g or greater.