① Generally low temperature type is used for light color, medium temperature type is used for medium color, and high temperature type is used for dark color;
② Different disperse dyes have different sensitivities to acids, which affects the color depth and color light, and serious changes in color and flowers. Therefore, the pH value of the dye solution must be adjusted. When the pH value is 4.5 to 5.5, In the most stable state;
③ For PET fiber dyeing, the dyeing temperature and rising stability control are the key. The initial temperature is controlled at 70 ～ 80 ℃ for light color, 80 ～ 85 ℃ for medium color, and 85 ～ 90 ℃ for dark color.
④ During finishing, the temperature and speed of each process must be strictly controlled.