The invention relates to a fire retardant polyester film especially to a colored fire retardant polyester film and it production technique. The colored fire retardant polyester film includes (1) fire retardant polyester slices, (2) lighting polyester slices, (3) color material, (4) additions of which the content ratios are: fire retardant polyester slices 70 to 95 percent; lighting polyester slices 0 to 25 percents; color material 0.5 to 3 percents; addition slices 1 to 10 percents. Its production technique includes following steps: (1) slice the fire retardant polyester and the lighting polyester, mix and dry the color material and the additions; (2) melt down and eject out the dry slices then cool it down to thick pieces on the casting piece roller; (3) pre-heat the cooled thick piece and transversely drag by 3 to 4 folds; (4) pre-heat the dragged film slice and transversely drag again by 3 to 4 folds; (5) shape the dragged films and roll up after cooled down to obtain the colored fire retardant polyester slices of oxygen factor larger than 32 percents. The colored fire retardant polyester slices produced in above method is of small error, plain surface, fine heat stability and the intensity meets the operating requirements. |