Spunbond Nonwoven Fabric, Filter Material, Air Filter, And Method For Producing Filter Material

Abstract: The present invention provides a spunbond nonwoven fabric that exhibits excellent pleat processabilibty, form-keeping properties, and breathability, and that is suitable for imparting functionality. To this end, provided is a spunbond nonwoven fabric constituted by composite fibers which include, as constituent components, a polyester resin P1 and a thermoplastic resin P2 that has a melting point lower than the melting point of the polyester resin P1 by 20°C or more, wherein: at least part of the surfaces of the composite fibers is the thermoplastic resin P2; at least some of the points of contact between the composite fibers have a micro fused part of a length of 5-100 µm in the fiber axis direction; the average single fiber diameter of the composite fibers is 15.0-40.0 µm; and, in a cross-section in the lateral direction of the spunbond nonwoven fabric, the average center-to-center distance between fibers that are closest to each other is not more than 50 µm.

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