NONWOVEN FABRIC

摘要

The present invention aims to provide nonwoven fabric of which undesired yellow discoloration is effectively inhibited. Here is disclosed a nonwoven fabric comprising thermoplastic elastomer fiber and thermoplastic polyolefin fiber, characterized in that : a variation of b-value appearing in laboratory color specifying system before and after irradiation of the thermoplastic elastomer fiber with 5000KJ/m 2 of UV radiation is 20 or higher, a variation of b-value appearing in the laboratory color specifying system before and after irradiation of the nonwoven fabric with 5000KJ/m 2 of UV radiation is 10 or less and a relationship expressed by a following equation(1) is established: Equation 1 w 1 �¢ r 2 �¢ Á 2 r 1 2 �¢ w 1 �¢ r 2 �¢ Á 2 + w 2 �¢ r 1 �¢ Á 1 ‰§ 9.7 × 10 - 4 where
w 1 : a percentage(%) by mass of polyolefin fiber in the nonwoven fabric; r 1 : a radius (µm) of polyolefin fiber; Á 1 : a density (g/cm 3 ) of polyolefin fiber; w 2 : percentage (%) by mass of thermoplastic elastomer fiber in the nonwoven fabric; r 2 : a radius (µm) of thermoplastic elastomer fiber; and Á 2 : a density(g/cm 3 ) of thermoplastic elastomer fiber.