Stained
During high temperature and high pressure dyeing, the dyeing process of disperse dyes on polyester fibers can be divided into the following stages:
(1) The disperse dyes gradually approach the fiber interface with the flow of the dyeing solution in the dyeing solution. At this stage, the nature and state of the disperse dyes are basically irrelevant. The dissolved dye molecules and suspended dye particles are the same with the dyeing solution and the transfer speed Determined by the solution flow rate.China polyester FDY Yarns Suppliers
(2) Since there is a dynamic boundary layer that is not easy to flow on the fiber surface, when the disperse dye enters the dynamic boundary layer and approaches the fiber interface, it will approach the fiber mainly by its own diffusion. The transfer speed at this stage is not only related to the flow rate of the solution, but also to the diffusion speed of the disperse dye. Therefore, the dissolved dye molecules diffuse much faster than the suspension and aggregates. The solubility and dispersion state of the disperse dye affect the transfer speed of this stage. Have a greater impact. High-strength polyester yarn
(3) When the disperse dye is close to the fiber interface and the molecular force between them is large enough, the disperse dye is quickly absorbed by the fiber surface. The transfer speed at this stage is mainly determined by the structure and properties of the fibers and dye molecules, and is also related to the nature of the interface solution. Among them, the solubility and dispersion state of the dye have a greater impact. The higher the solubility of the dye and the greater the interaction between dye molecules and fibers, the faster the adsorption speed.