Japanese Unexamined Patent Publication No. 2008-25082 discloses a process for producing a non-woven fabric, which at least has surface irregularities and allows permeation of a prescribed liquid such as body waste, by emitting air from an upper side onto a fiber web supported from a lower side by a prescribed air-permeable support member to move the fibers that compose the fiber web. It is taught therein that, when producing this non-woven fabric on a production line, the non-woven fabric is formed by increasing the content of fibers oriented in a lengthwise (longitudinal) direction (longitudinally oriented fibers) as a method of increasing resistance of the surface irregularities to deformation caused by line tension (Paragraph [0047]).
Japanese Unexamined Patent Publication (Translation of PCT Application) No. H10-502000 discloses an absorbent article provided with a liquid-permeable surface sheet on a skin side of an absorbent layer. A cover layer having corrugations on a support layer is provided in the absorbent article, leakage of body fluid can be prevented by these corrugations, and comfort when wearing is increased by the flexibility of the corrugations.
USPTO Backgrounds
USPTO Backgrounds