PROBLEM TO BE SOLVED: To provide a filament nonwoven fabric excellent in flexibility and wear resistance, and especially suitable for a disposable body warmer.SOLUTION: A filament nonwoven fabric is produced by a spun-bonded method in which a sheet is made by dispersing fibers on a netlike conveyor by discharging a molten polymer from an orifice and pulling it by a high-speed airflow for thinning and drawing. A thermo-compression spun-bonded nonwoven fabric is obtained by heating and pressing with a pair of engraving roll/flat roll. The spun-bonded nonwoven fabric contains 95% or more of polyethylene terephthalate and comprises filaments having a birefringence of 0.07-0.12. The nonwoven fabric has a KES flexural rigidity of 0.05-0.30 gf cm2/cm. The wear resistance grade of the nonwoven fabric satisfies the following formulae (1) to (3). The formula (1) is E1≥3, the formula (2) is E2≥1, and the formula (3) is E1-E2≥1. E1 is a wear resistance grade of the embossed face of the nonwoven fabric, and E2 is a wear resistance grade of the non-embossed surface of the nonwoven fabric.COPYRIGHT: (C)2013,JPO&INPIT【課題】柔軟性、耐摩耗性に優れた長繊維不織布、特に使い捨てカイロに好適な長繊維不織布を提供する。【解決手段】溶融ポリマーをオリフィスから吐出し、高速の空気流で牽引することで細化、延伸し、ネット状コンベア上に繊維を分散させてシート化するスパンボンド法で製造され、一対の彫刻ロール/フラットロールにより加熱・圧着することで得られる熱圧着型スパンボンド不織布において、ポリエチレンテレフタレートを95%以上含有し、複屈折率が0.07~0.12である長繊維からなる不織布であって、不織布のKES曲げ剛性が0.05~0.30gf・cm2/cmであり、不織布の耐磨耗等級が下式(1)~(3)を満足する長繊維不織布。E1≧3 ・・・ (1)E2≧1 ・・・ (2)E1-E2≧1 ・・・ (3)E1:不織布のエンボス面の耐磨耗等級、E2:不織布の反エンボス面の耐磨耗等級【選択図】図2
