Manufacturing method of spunbonded non-woven fabric, sanitary material, and spunbonded non-woven fabric

摘要

A group consisting of a propylene homopolymer having a melting point of 140 ° C. or higher, polyethylene having a density of 0.941 g / cm3 or more and 0.970 g / cm3 or less, a polymer shown in (I) below, and a polymer shown in (II) below. A fiber containing at least one polymer selected from the above, the fiber having a sea-island structure, and an island phase in a cross section orthogonal to the axial direction of the fiber, having a diameter of 0.12 μm or more and less than 0.63 μm. A spunbonded non-woven fabric having an island phase ratio of 30% or more on a number basis. (I) is a random copolymer of propylene and at least one selected from ethylene and α-olefin having 4 or more and 20 or less carbon atoms. (II) is a propylene homopolymer having a melting point of less than 120 ° C. that satisfies a specific condition.