The causes of color stains are roughly as follows:
1. Cohesion of dyes
Due to the direct collision of dye molecules, they aggregate into larger dye aggregates (or dye associations). These larger dye aggregates are deposited on the fabric during the dyeing process, causing color stains.
In the color development (or fixation) process of dyeing, strong cohesion between the dye molecules will cause the dyes to aggregate and cause color stains. Its characteristics are distributed and irregular.
2. Taring of dyes
The so-called tarification of dyes refers to the process in which dye particles and surfactants agglomerate into coal tar-like substances under high temperature conditions.
When anionic surfactants such as diffusing agents are used for dyeing, if the additives are poorly dissolved, the granular dyes and additives will adsorb each other. Once they are put into the pot, they will form a viscous paste that adheres to the fabric. Produce color stains.
3. The adhesion of color lake to fabric
In the dyeing process, due to improper operation, foaming of additives, etc., the dye liquor often has lakes on the surface. If these lakes are not treated, they will be brought to the fabric by the dye liquor foam, which will cause sticky color. Stains.