Decolorization method of polyester fabric

A decolorization method of a polyester fabric, comprising:

• providing a polyester fabric, wherein the polyester fabric is a dyed polyester fabric, and the polyester fabric is adhered with a dye and has a first L value;
• providing a first decolorizing solution and a second decolorizing solution, the first decolorizing solution containing a reductant, and the second decolorizing solution containing an oxidant;
• and
• performing a decolorization process which includes;
• heating the first decolonizing solution to a first decolorization temperature to decolorize one portion of the dye adhered on the polyester fabric, wherein the first decolonization temperature is between 135° C. and 180° C., first decolorization temperature is higher than a glass transition temperature of the polyester fabric, and the first decolorizing solution is maintained at a liquid phase in a pressure-resistant reaction tank;
• discharging the first decolorizing solution from the pressure-resistant reaction tank;
• heating the second decolorizing solution to a second decolorization temperature to decolorize another portion of the dye adhered on the polyester fabric, wherein the second decolorization temperature is between 135° C. and 180° C. the second decolonization temperature is higher than the glass transition temperature of the polyester fabric, and the second decolonizing solution is maintained at the liquid phase in the pressure-resistant reaction tank;
• and
• discharging the second decolorizing solution from the pressure-resistant reaction tank;
• wherein, after the decolorization process, the polyester fabric has a second L value that is greater than the first L value, and an intrinsic viscosity of the polyester fabric is decreased not more than 10%.