Patent ID: 7475455

Claim:
A fiber-made surface fastener comprising joining faces in which a plurality of fiber-made engaging elements are provided on one surface of each flat base fabric, wherein a ratio A/B of an area A of a range in which sound spectrum of a peeling-off sound produced when the joining faces of the surface fastener in an engaged state are peeled off Fourier-transformed in arange of 100 Hz to 15000 Hz is 100 Hz to 3000 Hz to an area B of a range in which sound spectrum of a peeling-off sound produced when the joining faces of the surface fastener in an engaged state are peeled off Fourier-transformed in a range of 100 Hz to 15000 Hz is 3000 Hz to 15000 Hz is 0.4 or more, an apparent density of a base fabric of each of fiber-made surface fastener members which engage each other is 0.5 g/cm 3 or less and a joining face of at least one surface fastener member is composed of a plurality of fiber-made engaging elements distributed uniformly on the entire surface of each flat base fabric, and a sum of bending strength of base fabrics of male and female surface fastener members is 36 gf·cm/2.5 cm or less when each base fabric is bent at 180° in a radius of 4.0 mm.