to the present invention in a textile winder the process steps as well as the schematic nature of the filaments of the yarn during the processing is represented in fig1 the direction of movement of the yarn during processing is indicated by the arrow 2 a supply spool 10 of a multi filament partially oriented yarn poy 12 is fed from the spool 10 to a first shaft 20 also called an input feeding shaft or roll rotating at a given speed from this shaft 20 the yarn is fed to a second shaft or roll 60 which turns at a higher speed than the first shaft 20 thus the yarn 12 is simultaneously drawn its length is increased and diameter diminished and twisted the yarn 12 is twisted after the first shaft 20 by a friction device such as a set of spindles or friction discs 50 which produce a twisted yarn 22 the yarn 22 enters a heater 30 where its temperature is increased so that the yarn 22 is thermo fixed 130 u00b0 c to 500 u00b0 c the heater 30 is followed immediately by a cooling zone 40 which may be at room temperature or may be cooled below room temperature the cooler 40 has a smooth curved surface which facilitates the cooling and reduces the likelihood of breaking very fine filaments of yarn the yarn 52 leaving the friction discs 50 may in some cases be straightened as represented in the fig1.