PURPOSE:To produce the title mixed yarn having silk-like touch and feeling stably with high productivity by melt-extruding polyester polymer through a specific spinneret, winding up the cooled and solidified filaments and preheating and drawing the filaments. CONSTITUTION:A polyester polymer is melt-extruded through a spinneret which has 4 orifice groups in which the orifices have a cross section of more than 1.6 modification degree and have a combination of slits differing in the shape and dimension, solidified with cooling air within 50mm just under the nozzle plate and taken up at a speed of 5,000 to 6,000m/min. The filaments are preheated at 85 to 120 deg.C and drawn at a rate of 1.1 to 1.2 to give the subject mixed yarn in which the filament denier of the most thick filament group is 3 to 5 denier, while the thinnest group is 0.3 to 1.5 denier, the dry-shrinkage stress of the total yarn is more than 0.25g/d and the temperature at which the maximum shrinkage stress develops is 65 to 80 deg.C.
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