FIELD: polymer materials. SUBSTANCE: fibers are formed from polyketone solution by forming heat-reversible gel from polyketone solution and solvent for polymer with boiling point above 443K and melting point below 373K, polymer dissolution temperature exceeding 443K. Invariably oriented heat-reversible gel is formed upon cooling of solution because of specific properties of solvent in conjunction with polymer concentration and its intrinsic viscosity. Cooled polymer undergoes crystallization, presence of solvent being in this case unnecessary. Such amount of polymer is advantageously dissolved that product of polymer concentration and its intrinsic viscosity exceeded value 0.35 (dl/g)0,5. EFFECT: reduced cost of fiber manufacture and improved mechanical characteristics of fibers. 12 cl, 1 dwg, 9 tbl, 8 ex
