Patent ID: 6887411

Claim:
A method for producing a polyester blended yarn, characterized by melt-extruding a polyester composition A which comprises a substrate polymer comprising a polyester and 0.5 to 5.0 percent by weight of a polymer P different from the substrate polymer, and the substrate polymer from an identical spinneret or different spinnerets, respectively, to obtain the filament group A comprising the polyester composition A and the filament group B comprising the substrate polymer, once separately cooling and solidifying the filament groups, blowing the cooling air on the filament group B at a speed (BSb) of 0.20 to 0.80 m/sec and the cooling air on the filament group A at a speed (ASb) of not less than 1.1 times the speed (BSb), respectively, doubling the filament groups, and then taking off the obtained blended yarn at a speed of not less than 2,500 m/mm.