Patent ID: 9315931
Filing Date: 2016-04-19
CPC Classification: A61F,B29C,B32B,D04H,Y10T

Claim Text:
1. A method of processing a non-woven fabric sheet, comprising the steps of: a) opening a first fiber assembly containing heat-fusible fibers by passing the first fiber assembly through a carding machine to form a web containing heat-fusible fibers, b) opening a second fiber assembly containing latent crimpable fibers by passing the second fiber assembly through a carding machine to form a web containing latent crimpable fibers, c) superimposing the web containing heat-fusible fibers and the web containing latent crimpable fibers to form a laminated web, d) creating a difference in shrinkage force in the machine direction in the laminated web by causing crimping of the latent crimpable fibers during a heat treatment step over a prescribed width in the machine direction, f) heating the laminated web to a temperature that: i) is lower than the fusing temperature of the heat-fusible fibers; and ii) causes crimping of the latent crimpable fibers by lowering resistance to crimping of the latent crimpable fibers, and g) fusing the web obtained in step f at sites where the heat-fusible fibers mutually intersect by heating to a temperature equal to or higher than the fusing temperature of the heat-fusible fibers.