COMPOSITE FIBER, METHOD FOR MANUFACTURING SAME, THERMALLY BONDED NONWOVEN FABRIC, SURFACE SHEET FOR ABSORBENT ARTICLE, AND ABSORBENT ARTICLE

摘要

The present invention pertains to a composite fiber wherein: a core component and a sheath component are arranged substantially concentrically; the ratio by volume of core component/sheath component is 30/70-70/30; the monofilament fineness is 0.6 dtex or more and less than 2.0 dtex; the core component contains 60 mass% or more of a polyester resin; the sheath component contains 60 mass% or more of a high-density polyethylene; the melt mass flow rate of the high-density polyethylene is more than 13 g/10 min and not more than 45 g/10 min; the crystallite size measured for [110] plane of the high-density polyethylene contained in the sheath component is 20.0-50.0 nm; and the fusion heat of the high-density polyethylene (ΔH_PE-HD) measured by differential scanning calorimetry (DSC) is 145.0 mJ/mg or more.