| 摘要 |
A nonwoven fabric having an enhanced bulkiness and uniformity is produced by forming a nonwoven fabric, by an air-laid method, from machine-crimped synthetic fibers having a thickness of 0.5 to 200 dtex and a length of 3 to 30 mm, each fiber being constituted from two portions disproportional in thermal shrinkability from each other and located on both respective sides with respect to an imaginary interface extending along the longitudinal axis of each fiber, to thereby exhibit a latent crimpability upon being heated to manifest three-dimensional crimps and each fiber having mechanical crimps at the number of crimps of 1 to 13 crimps/25 mm and a crimp ratio of 2 to 20%; and heat-treating the resultant air-laid nonwoven fabric to manifest the three dimensional crimps on each fiber in the fabric.
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