Patent ID: 8153253

Claim:
A conjugate fiber-containing yarn comprising a conjugate fiber in which a polyester component and a polyamide component are conjugated with each other in a side-by-side structure or an eccentric core-in-sheath structure, wherein (1) the polyester component comprises a modified polyester in which 5-sodiumsulfoisophthalic acid is copolymerized in an amount of from 2.0 to 4.5% by mole based on a total molecular amount of the acid component, and the intrinsic viscosity IV of the polyester component is from 0.30 to 0.43, and (2) the conjugate fiber is one produced from an undrawn conjugate fiber by a direct drawing procedure in which the undrawn conjugate fiber is directly drawn and heat set, without winding, by using a drawing machine having first and second rollers in which the conjugate fiber is preheated at a temperature of 50 to 100° C. by the first roller and heat-set at a temperature of 80 to 140° C. by the second roller, whereby the conjugate fiber is capable of manifesting crimps when heat treated, and the crimp ratio of the crimp-manifested conjugate fiber is increased by moisture or water absorption of the conjugate fiber.