Stretchable non-woven fabric having excellent repetition durability

A stretchable non-woven fabric comprising crimped fibers, satisfying the following formula:

• (σ65−σ55)/(σ30−σ20)≥3.5
• wherein σ20, σ30, σ55 and σ65 area stress σ (N/50 mm) at a strain ε of 20%, 30%, 55%, and 65% in a stress-strain curve by a tensile test for a machine direction (MD) in a manufacturing process or a longitudinal direction in a sheet plane, respectively,
• wherein the stretchable non-woven fabric is produced by the following method comprising:
• webbing fibers comprising a composite fiber, thereby making a composite fiber web,
• making the fibers in the composite fiber web localized in a plane prior to entangling the fibers by spraying or injecting low-pressure water intermittently or periodically to the composite fiber web to form a plurality of low-density parts and a plurality of high-density parts alternately and periodically,
• entangling the fibers in the composite fiber web by spraying or injecting water, and
• heating the composite fiber web to crimp the composite fiber,
• wherein breaking strength of the stretchable non-woven fabric by a tensile test for the machine direction (MD) or the longitudinal direction in the sheet plane and in a direction (a CD direction) orthogonal to the machine direction (MD) or in a width direction in the sheet plane is at least 40 N/50 mm,
• wherein a stress σ80 at a strain ε of 80% is greater than or equal to at least 20 N/50 mm,
• wherein a jet pressure of the water for entangling the fibers in the fiber web is greater than a jet pressure of the water for making the fibers in the composite fiber web localized in a plane, and
• wherein the stretchable non-woven fabric has a mass per unit area of from 90 g/m2 to 96.2 g/m2.