PURPOSE: To obtain acetate fibers with prevented occurrence of broken yarns in the fiber making step, by dissolving cellulose diacetate in a mixture of methylene chloride with methanol, and spinning the resultant spinning solution by the dry spinning method.

CONSTITUTION: Cellulose diacetate is dissolved in a mixture of methylene chloride with 8W15wt% methanol to give 21W24wt% cellulose diacetate concentration, and the resultant spinning solution is then heated at 70W80°C and extruded through spinning nozzles at a speed ratio satisfying the formula (VT/VE)≤0.85 (VE is the speed of the spinning solution extruded through the spinning nozzle; VT is the yarn taking off speed) by the dry spinning method.