Dyeing process of high temperature and high pressure dyeing machine

(1) Adsorption

When the fiber is put into the dye solution, the dye in the dye solution will gradually disperse and transfer to the surface of the fiber. This process is called adsorption. Adsorption is reversible, because the dye that has been dyed on the fiber will be re-dispersed into the dye bath due to changes in the dye concentration in the dye liquor, a process called desorption. During the dyeing process, adsorption and desorption exist together and maintain equilibrium.

(2) Dispersion

Because the dye is adsorbed on the surface of the fiber, the dye concentration difference is formed inside and outside the fiber, thus promoting the dispersion of the dye from the fiber to the inside. At this time, the dye in the solution continues to adsorb to the surface of the fiber until the adsorption and desorption reach equilibrium again.

(3) Fixation

The process by which the dyes dispersed inside the fibers bind to the fibers is called fixation. The fixation method varies with the type of dye and fiber. In the dyeing process, these stages are distinguished and connected with each other, and cannot be completely separated.