Dyeing polyester fibers using the crazing method

As we know, finished polyester fibers are very difficult to dye, especially at low temperature (including room temperature). An exception is processes for dying undrawn fibers. We have studied use of the crazing method to dye polyester fibers at low temperatures with water-soluble dyes not having an affinity for polyethylene terephthalate. We have studied the effect on sorption of cationic dyes from the composition, concentration, and temperature of the adsorption-active medium, and the dye concentration in the dye bath. The results of the study are the basis for developing a production process for obtaining colored special-purpose polyester fibers.