Non woven fabric

Abstract

In order to provide a non-woven fabric with excellent flame retardancy and flame shielding performance, and even also with carding process-passing and durability, there is provided a non-woven fabric including: a non-melting fiber A that has a high-temperature shrinkage ratio of 3% or less; a thermoplastic fiber B that has an LOI value of 25 or more in accordance with JIS K 7201-2 (2007); and a thermoplastic fiber C that has an LOI value of less than 25 in accordance with JIS K 7201-2 (2007) and a crimp number of 8 (crimps/25 mm) or more in accordance with JIS L 1015 (2000).

1 . A non-woven fabric comprising:
 a non-melting fiber A that has a high-temperature shrinkage ratio of 3% or less;   a thermoplastic fiber B that has an LOI value of 25 or more in accordance with JIS K 7201-2 (2007); and   a thermoplastic fiber C that has an LOI value of less than 25 in accordance with JIS K 7201-2 (2007) and a crimp number of 8 (crimps/25 mm) or more in accordance with JIS L 1015 (2000).   
     
     
         2 . The non-woven fabric according to  claim 1 , wherein the thermoplastic fiber C is contained a 20 to 50% by mass in 100% by mass of the non-woven fabric. 
     
     
         3 . The non-woven fabric according to  claim 1 , wherein the non-melting fiber A is contained at 10% by mass or more in 100% by mass of the non-woven fabric. 
     
     
         4 . The non-woven fabric according to  claim 1 , wherein the thermoplastic fiber B is contained at 20% by mass or more in 100% by mass of the non-woven fabric. 
     
     
         5 . The non-woven fabric according to  claim 1 , wherein the non-melting fiber A has a thermal conductivity of 0.060 W/m·K or less. 
     
     
         6 . The non-woven fabric according to  claim 1 , wherein the non-melting fiber A is one or more selected from a flame-resistant fiber and a meta-aramid fiber. 
     
     
         7 . The non-woven fabric according to  claim 1 , wherein the thermoplastic fiber B has a glass transition temperature of 120° C. or lower. 
     
     
         8 . The non-woven fabric according to  claim 1 , wherein the thermoplastic fiber B is a fiber of at least one resin selected from the group of a flame-retardant polyester fiber, an anisotropic melt polyester, a flame-retardant poly(acrylonitrile butadiene styrene), a flame-retardant polysulfone, a poly(ether-ether-ketone), a poly(ether-ketone-ketone), a polyether sulfone, a polyarylate, a polyarylene sulfide, a polyphenylsulfone, a polyetherimide, a polyamideimide, and a mixture thereof. 
     
     
         9 . The non-woven fabric according to  claim 1 , wherein the thermoplastic fiber B contains a sulfur atom. 
     
     
         10 . The non-woven fabric according to  claim 1 , wherein the non-woven fabric is 50 g/m 2  or more in weight per unit area and 50 kg/m 3  or less in density.