Patent ID: 9233032
Filing Date: 2016-01-12
CPC Classification: A61F,D04H,Y10T

Claim Text:
1. A liquid-pervious sheet having a longitudinal direction, a transverse direction and a thickness direction being orthogonal to one another, and comprising a nonwoven fabric made of thermoplastic synthetic fibers; wherein both surfaces of a liquid-pervious sheet intersect with the thickness direction and extend in the longitudinal direction and the transverse direction; and one of the surfaces includes protruding crests and recessed troughs extending in the longitudinal direction and alternating in the transverse direction to form an undulated surface having repeated undulations; the other of the surfaces being formed to be a flat surface, wherein: at least in the crests, the undulated surface includes dot-like debosses formed by locally compressing the nonwoven fabric from the undulated surface toward the opposite surface thereof without melting the thermoplastic fibers to the extent that they lose their initial fibrous configuration; and the thermoplastic synthetic fibers in the nonwoven fabric more densely gather together in the debosses and in zones underlying respective the debosses than in zones surrounding the debosses wherein the fiber-form of each of the thermoplastic fibers is maintained.