Spun-bonded non-woven fabric

Abstract

To provide a spun-bonded nonwoven fabric having excellent strength even at a low basis weight and excellent flexibility and touch feeling, the spun-bonded nonwoven fabric of the present invention is a spun-bonded nonwoven fabric made of a core-sheath composite fiber containing a polypropylene-based resin as a main component, in which the spun-bonded nonwoven fabric has a bonding area and a non-bonding area, and a ratio (Os/Oc) of an orientation parameter Os of a sheath component of the core-sheath composite fiber in the non-bonding area to an orientation parameter Oc of a core component of the core-sheath composite fiber in the non-bonding area is 0.10 to 0.90.

1 . A spun-bonded nonwoven fabric comprising a core-sheath composite fiber including a polypropylene-based resin as a main component,
 wherein the spun-bonded nonwoven fabric has a bonding area and a non-bonding area, and   a ratio (Os/Oc) of an orientation parameter Os of a sheath component of the core-sheath composite fiber in the non-bonding area to an orientation parameter Oc of a core component of the core-sheath composite fiber in the non-bonding area is 0.10 to 0.90.   
     
     
         2 . The spun-bonded nonwoven fabric according to  claim 1 , wherein the orientation parameter Os of the sheath component of the core-sheath composite fiber in the non-bonding area is 1.0 or more and 8.0 or less. 
     
     
         3 . The spun-bonded nonwoven fabric according to  claim 1 , wherein the spun-bonded nonwoven fabric has a single melting peak temperature Tm (° C.) in a differential scanning calorimetry. 
     
     
         4 . The spun-bonded nonwoven fabric according to  claim 1 , wherein a tensile strength and elongation product per a basis weight of the spun-bonded nonwoven fabric is 1.20 (N/50 mm)/(g/m 2 ) or more. 
     
     
         5 . The spun-bonded nonwoven fabric according to  claim 1 , wherein a melt flow rate of polypropylene-based resin of the sheath component is larger than a melt flow rate of polypropylene-based resin of the core component by 10 g/10 min to 200 g/10 min.