was diluted with water to prepare a 10 aqueous solution after polyethylene terephthalate chips with intrinsic viscosity of 0 64 and containing titanium oxide by 0 2 were dried by a known method they were spun at 295 u00b0 c by using an extruder the 10 aqueous solution thus prepared was applied onto the yarns extruded out of the nozzle to be cooled and solidified by a guide oiling method using a measuring pump such that the attached amount of the processing agent became as shown in table 4 thereafter the yarns were collected by means of a guide and wound up at the rate of 3000 m minute without any drawing by a mechanical means to obtain partially oriented 56 decitex 144 filament yarns as wound cakes of 10 kg the cakes thus obtained as described above were subjected to a false twisting process under the conditions described below by using a false twister of the contact heater type product name of sds 1200 produced by teijinseiki co ltd twisting system three axis disk friction method with one guide disk on the inlet side one guide disk on the outlet side and four hard polyurethane disks heater on twisting side length of 2 5 m with surface temperature of 210 u00b0 c the false twisting process was carried out under the conditions given above by a continuous operation of 25 days in the aforementioned false twisting process the number of fluffs per hour was measured by means of a fly counter produce name of dt 105 produced by toray engineering co ltd before the false twisted yarns.