Spun Bonded Nonwoven Fabric, Filter Laminate Filter Material, Filter Material For Dust Collector Pleated Filter, Dust Collector Pleated Filter, And Medium Air Volume Pulse Jet Type Dust Collector

Abstract: A spun-bonded nonwoven fabric according to the present invention comprises a thermoplastic continuous filament constituted of a high-melting point component and a low-melting point component, and is partially-fused. The spun-bonded nonwoven fabric has a convex portion which is not fused and a concave portion which is fused. The bending resistance of the spun-bonded nonwoven fabric in the MD direction is 20-40 mN inclusive. In a cross section of the nonwoven fabric, a thickness tA from one surface to another surface of the convex portion, a thickness tB from one surface to another surface of the concave portion, and respective distances tC and tD between the one surface of the convex portion and the one surface of the concave portion (tC < tD) have a relationship represented by expressions (1) and (2).

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