Patent ID: 9422652
Filing Date: 2016-08-23
CPC Classification: B32B,D04H,Y10T

Claim Text:
1. A stretchable bulky nonwoven fabric, wherein a first fibrous layer including fibers ( 1 ) is laminated with a second fibrous layer including heat fusible fibers ( 2 ) and having a MD shrinkage ratio that is lower by 5% or more than a MD shrinkage ratio of the first fibrous layer, the first fibrous layer and the second fibrous layer are integrated by partial entanglement of the fibers ( 1 ) included in the first fibrous layer and the fibers ( 2 ) included in the second fibrous layer at an interface between the first fibrous layer and the second fibrous layer in a thickness direction of the nonwoven fabric, wherein partial entanglement comprises entanglements and regions between the entanglements, the first fibrous layer is shrunk to form a structure in which the second fibrous layer is raised in a thickness direction at the regions between the entanglements, and sonic bond processing is partially applied to the first and second fibrous layers from a side of the second fibrous layer after the entanglement and shrinkage, wherein the entanglement and shrinkage are simultaneously achieved by increasing a temperature to a level in which helical crimps are developed in fibers ( 1 ) or to a higher level, and the fibers ( 1 ) develop helical crimps and shrink so as to tangle the fibers ( 2 ) included in the second fibrous layer.